8203059: (so) Closing a socket channel registered with Selector and with SO_LINGER set to 0 does not reset connection
Reviewed-by: chegar
/*
* Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
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*/
package java.sql;
import java.util.Properties;
import java.util.concurrent.Executor;
/**
* <P>A connection (session) with a specific
* database. SQL statements are executed and results are returned
* within the context of a connection.
* <P>
* A <code>Connection</code> object's database is able to provide information
* describing its tables, its supported SQL grammar, its stored
* procedures, the capabilities of this connection, and so on. This
* information is obtained with the <code>getMetaData</code> method.
*
* <P><B>Note:</B> When configuring a <code>Connection</code>, JDBC applications
* should use the appropriate <code>Connection</code> method such as
* <code>setAutoCommit</code> or <code>setTransactionIsolation</code>.
* Applications should not invoke SQL commands directly to change the connection's
* configuration when there is a JDBC method available. By default a <code>Connection</code> object is in
* auto-commit mode, which means that it automatically commits changes
* after executing each statement. If auto-commit mode has been
* disabled, the method <code>commit</code> must be called explicitly in
* order to commit changes; otherwise, database changes will not be saved.
* <P>
* A new <code>Connection</code> object created using the JDBC 2.1 core API
* has an initially empty type map associated with it. A user may enter a
* custom mapping for a UDT in this type map.
* When a UDT is retrieved from a data source with the
* method <code>ResultSet.getObject</code>, the <code>getObject</code> method
* will check the connection's type map to see if there is an entry for that
* UDT. If so, the <code>getObject</code> method will map the UDT to the
* class indicated. If there is no entry, the UDT will be mapped using the
* standard mapping.
* <p>
* A user may create a new type map, which is a <code>java.util.Map</code>
* object, make an entry in it, and pass it to the <code>java.sql</code>
* methods that can perform custom mapping. In this case, the method
* will use the given type map instead of the one associated with
* the connection.
* <p>
* For example, the following code fragment specifies that the SQL
* type <code>ATHLETES</code> will be mapped to the class
* <code>Athletes</code> in the Java programming language.
* The code fragment retrieves the type map for the <code>Connection
* </code> object <code>con</code>, inserts the entry into it, and then sets
* the type map with the new entry as the connection's type map.
* <pre>
* java.util.Map map = con.getTypeMap();
* map.put("mySchemaName.ATHLETES", Class.forName("Athletes"));
* con.setTypeMap(map);
* </pre>
*
* @see DriverManager#getConnection
* @see Statement
* @see ResultSet
* @see DatabaseMetaData
* @since 1.1
*/
public interface Connection extends Wrapper, AutoCloseable {
/**
* Creates a <code>Statement</code> object for sending
* SQL statements to the database.
* SQL statements without parameters are normally
* executed using <code>Statement</code> objects. If the same SQL statement
* is executed many times, it may be more efficient to use a
* <code>PreparedStatement</code> object.
* <P>
* Result sets created using the returned <code>Statement</code>
* object will by default be type <code>TYPE_FORWARD_ONLY</code>
* and have a concurrency level of <code>CONCUR_READ_ONLY</code>.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @return a new default <code>Statement</code> object
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
*/
Statement createStatement() throws SQLException;
/**
* Creates a <code>PreparedStatement</code> object for sending
* parameterized SQL statements to the database.
* <P>
* A SQL statement with or without IN parameters can be
* pre-compiled and stored in a <code>PreparedStatement</code> object. This
* object can then be used to efficiently execute this statement
* multiple times.
*
* <P><B>Note:</B> This method is optimized for handling
* parametric SQL statements that benefit from precompilation. If
* the driver supports precompilation,
* the method <code>prepareStatement</code> will send
* the statement to the database for precompilation. Some drivers
* may not support precompilation. In this case, the statement may
* not be sent to the database until the <code>PreparedStatement</code>
* object is executed. This has no direct effect on users; however, it does
* affect which methods throw certain <code>SQLException</code> objects.
* <P>
* Result sets created using the returned <code>PreparedStatement</code>
* object will by default be type <code>TYPE_FORWARD_ONLY</code>
* and have a concurrency level of <code>CONCUR_READ_ONLY</code>.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @param sql an SQL statement that may contain one or more '?' IN
* parameter placeholders
* @return a new default <code>PreparedStatement</code> object containing the
* pre-compiled SQL statement
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
*/
PreparedStatement prepareStatement(String sql)
throws SQLException;
/**
* Creates a <code>CallableStatement</code> object for calling
* database stored procedures.
* The <code>CallableStatement</code> object provides
* methods for setting up its IN and OUT parameters, and
* methods for executing the call to a stored procedure.
*
* <P><B>Note:</B> This method is optimized for handling stored
* procedure call statements. Some drivers may send the call
* statement to the database when the method <code>prepareCall</code>
* is done; others
* may wait until the <code>CallableStatement</code> object
* is executed. This has no
* direct effect on users; however, it does affect which method
* throws certain SQLExceptions.
* <P>
* Result sets created using the returned <code>CallableStatement</code>
* object will by default be type <code>TYPE_FORWARD_ONLY</code>
* and have a concurrency level of <code>CONCUR_READ_ONLY</code>.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @param sql an SQL statement that may contain one or more '?'
* parameter placeholders. Typically this statement is specified using JDBC
* call escape syntax.
* @return a new default <code>CallableStatement</code> object containing the
* pre-compiled SQL statement
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
*/
CallableStatement prepareCall(String sql) throws SQLException;
/**
* Converts the given SQL statement into the system's native SQL grammar.
* A driver may convert the JDBC SQL grammar into its system's
* native SQL grammar prior to sending it. This method returns the
* native form of the statement that the driver would have sent.
*
* @param sql an SQL statement that may contain one or more '?'
* parameter placeholders
* @return the native form of this statement
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
*/
String nativeSQL(String sql) throws SQLException;
/**
* Sets this connection's auto-commit mode to the given state.
* If a connection is in auto-commit mode, then all its SQL
* statements will be executed and committed as individual
* transactions. Otherwise, its SQL statements are grouped into
* transactions that are terminated by a call to either
* the method <code>commit</code> or the method <code>rollback</code>.
* By default, new connections are in auto-commit
* mode.
* <P>
* The commit occurs when the statement completes. The time when the statement
* completes depends on the type of SQL Statement:
* <ul>
* <li>For DML statements, such as Insert, Update or Delete, and DDL statements,
* the statement is complete as soon as it has finished executing.
* <li>For Select statements, the statement is complete when the associated result
* set is closed.
* <li>For <code>CallableStatement</code> objects or for statements that return
* multiple results, the statement is complete
* when all of the associated result sets have been closed, and all update
* counts and output parameters have been retrieved.
*</ul>
* <P>
* <B>NOTE:</B> If this method is called during a transaction and the
* auto-commit mode is changed, the transaction is committed. If
* <code>setAutoCommit</code> is called and the auto-commit mode is
* not changed, the call is a no-op.
*
* @param autoCommit <code>true</code> to enable auto-commit mode;
* <code>false</code> to disable it
* @exception SQLException if a database access error occurs,
* setAutoCommit(true) is called while participating in a distributed transaction,
* or this method is called on a closed connection
* @see #getAutoCommit
*/
void setAutoCommit(boolean autoCommit) throws SQLException;
/**
* Retrieves the current auto-commit mode for this <code>Connection</code>
* object.
*
* @return the current state of this <code>Connection</code> object's
* auto-commit mode
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @see #setAutoCommit
*/
boolean getAutoCommit() throws SQLException;
/**
* Makes all changes made since the previous
* commit/rollback permanent and releases any database locks
* currently held by this <code>Connection</code> object.
* This method should be
* used only when auto-commit mode has been disabled.
*
* @exception SQLException if a database access error occurs,
* this method is called while participating in a distributed transaction,
* if this method is called on a closed connection or this
* <code>Connection</code> object is in auto-commit mode
* @see #setAutoCommit
*/
void commit() throws SQLException;
/**
* Undoes all changes made in the current transaction
* and releases any database locks currently held
* by this <code>Connection</code> object. This method should be
* used only when auto-commit mode has been disabled.
*
* @exception SQLException if a database access error occurs,
* this method is called while participating in a distributed transaction,
* this method is called on a closed connection or this
* <code>Connection</code> object is in auto-commit mode
* @see #setAutoCommit
*/
void rollback() throws SQLException;
/**
* Releases this <code>Connection</code> object's database and JDBC resources
* immediately instead of waiting for them to be automatically released.
* <P>
* Calling the method <code>close</code> on a <code>Connection</code>
* object that is already closed is a no-op.
* <P>
* It is <b>strongly recommended</b> that an application explicitly
* commits or rolls back an active transaction prior to calling the
* <code>close</code> method. If the <code>close</code> method is called
* and there is an active transaction, the results are implementation-defined.
*
* @exception SQLException if a database access error occurs
*/
void close() throws SQLException;
/**
* Retrieves whether this <code>Connection</code> object has been
* closed. A connection is closed if the method <code>close</code>
* has been called on it or if certain fatal errors have occurred.
* This method is guaranteed to return <code>true</code> only when
* it is called after the method <code>Connection.close</code> has
* been called.
* <P>
* This method generally cannot be called to determine whether a
* connection to a database is valid or invalid. A typical client
* can determine that a connection is invalid by catching any
* exceptions that might be thrown when an operation is attempted.
*
* @return <code>true</code> if this <code>Connection</code> object
* is closed; <code>false</code> if it is still open
* @exception SQLException if a database access error occurs
*/
boolean isClosed() throws SQLException;
//======================================================================
// Advanced features:
/**
* Retrieves a <code>DatabaseMetaData</code> object that contains
* metadata about the database to which this
* <code>Connection</code> object represents a connection.
* The metadata includes information about the database's
* tables, its supported SQL grammar, its stored
* procedures, the capabilities of this connection, and so on.
*
* @return a <code>DatabaseMetaData</code> object for this
* <code>Connection</code> object
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
*/
DatabaseMetaData getMetaData() throws SQLException;
/**
* Puts this connection in read-only mode as a hint to the driver to enable
* database optimizations.
*
* <P><B>Note:</B> This method cannot be called during a transaction.
*
* @param readOnly <code>true</code> enables read-only mode;
* <code>false</code> disables it
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection or this
* method is called during a transaction
*/
void setReadOnly(boolean readOnly) throws SQLException;
/**
* Retrieves whether this <code>Connection</code>
* object is in read-only mode.
*
* @return <code>true</code> if this <code>Connection</code> object
* is read-only; <code>false</code> otherwise
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
*/
boolean isReadOnly() throws SQLException;
/**
* Sets the given catalog name in order to select
* a subspace of this <code>Connection</code> object's database
* in which to work.
* <P>
* If the driver does not support catalogs, it will
* silently ignore this request.
* <p>
* Calling {@code setCatalog} has no effect on previously created or prepared
* {@code Statement} objects. It is implementation defined whether a DBMS
* prepare operation takes place immediately when the {@code Connection}
* method {@code prepareStatement} or {@code prepareCall} is invoked.
* For maximum portability, {@code setCatalog} should be called before a
* {@code Statement} is created or prepared.
*
* @param catalog the name of a catalog (subspace in this
* <code>Connection</code> object's database) in which to work
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @see #getCatalog
*/
void setCatalog(String catalog) throws SQLException;
/**
* Retrieves this <code>Connection</code> object's current catalog name.
*
* @return the current catalog name or <code>null</code> if there is none
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @see #setCatalog
*/
String getCatalog() throws SQLException;
/**
* A constant indicating that transactions are not supported.
*/
int TRANSACTION_NONE = 0;
/**
* A constant indicating that
* dirty reads, non-repeatable reads and phantom reads can occur.
* This level allows a row changed by one transaction to be read
* by another transaction before any changes in that row have been
* committed (a "dirty read"). If any of the changes are rolled back,
* the second transaction will have retrieved an invalid row.
*/
int TRANSACTION_READ_UNCOMMITTED = 1;
/**
* A constant indicating that
* dirty reads are prevented; non-repeatable reads and phantom
* reads can occur. This level only prohibits a transaction
* from reading a row with uncommitted changes in it.
*/
int TRANSACTION_READ_COMMITTED = 2;
/**
* A constant indicating that
* dirty reads and non-repeatable reads are prevented; phantom
* reads can occur. This level prohibits a transaction from
* reading a row with uncommitted changes in it, and it also
* prohibits the situation where one transaction reads a row,
* a second transaction alters the row, and the first transaction
* rereads the row, getting different values the second time
* (a "non-repeatable read").
*/
int TRANSACTION_REPEATABLE_READ = 4;
/**
* A constant indicating that
* dirty reads, non-repeatable reads and phantom reads are prevented.
* This level includes the prohibitions in
* <code>TRANSACTION_REPEATABLE_READ</code> and further prohibits the
* situation where one transaction reads all rows that satisfy
* a <code>WHERE</code> condition, a second transaction inserts a row that
* satisfies that <code>WHERE</code> condition, and the first transaction
* rereads for the same condition, retrieving the additional
* "phantom" row in the second read.
*/
int TRANSACTION_SERIALIZABLE = 8;
/**
* Attempts to change the transaction isolation level for this
* <code>Connection</code> object to the one given.
* The constants defined in the interface <code>Connection</code>
* are the possible transaction isolation levels.
* <P>
* <B>Note:</B> If this method is called during a transaction, the result
* is implementation-defined.
*
* @param level one of the following <code>Connection</code> constants:
* <code>Connection.TRANSACTION_READ_UNCOMMITTED</code>,
* <code>Connection.TRANSACTION_READ_COMMITTED</code>,
* <code>Connection.TRANSACTION_REPEATABLE_READ</code>, or
* <code>Connection.TRANSACTION_SERIALIZABLE</code>.
* (Note that <code>Connection.TRANSACTION_NONE</code> cannot be used
* because it specifies that transactions are not supported.)
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection
* or the given parameter is not one of the <code>Connection</code>
* constants
* @see DatabaseMetaData#supportsTransactionIsolationLevel
* @see #getTransactionIsolation
*/
void setTransactionIsolation(int level) throws SQLException;
/**
* Retrieves this <code>Connection</code> object's current
* transaction isolation level.
*
* @return the current transaction isolation level, which will be one
* of the following constants:
* <code>Connection.TRANSACTION_READ_UNCOMMITTED</code>,
* <code>Connection.TRANSACTION_READ_COMMITTED</code>,
* <code>Connection.TRANSACTION_REPEATABLE_READ</code>,
* <code>Connection.TRANSACTION_SERIALIZABLE</code>, or
* <code>Connection.TRANSACTION_NONE</code>.
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @see #setTransactionIsolation
*/
int getTransactionIsolation() throws SQLException;
/**
* Retrieves the first warning reported by calls on this
* <code>Connection</code> object. If there is more than one
* warning, subsequent warnings will be chained to the first one
* and can be retrieved by calling the method
* <code>SQLWarning.getNextWarning</code> on the warning
* that was retrieved previously.
* <P>
* This method may not be
* called on a closed connection; doing so will cause an
* <code>SQLException</code> to be thrown.
*
* <P><B>Note:</B> Subsequent warnings will be chained to this
* SQLWarning.
*
* @return the first <code>SQLWarning</code> object or <code>null</code>
* if there are none
* @exception SQLException if a database access error occurs or
* this method is called on a closed connection
* @see SQLWarning
*/
SQLWarning getWarnings() throws SQLException;
/**
* Clears all warnings reported for this <code>Connection</code> object.
* After a call to this method, the method <code>getWarnings</code>
* returns <code>null</code> until a new warning is
* reported for this <code>Connection</code> object.
*
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
*/
void clearWarnings() throws SQLException;
//--------------------------JDBC 2.0-----------------------------
/**
* Creates a <code>Statement</code> object that will generate
* <code>ResultSet</code> objects with the given type and concurrency.
* This method is the same as the <code>createStatement</code> method
* above, but it allows the default result set
* type and concurrency to be overridden.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @param resultSetType a result set type; one of
* <code>ResultSet.TYPE_FORWARD_ONLY</code>,
* <code>ResultSet.TYPE_SCROLL_INSENSITIVE</code>, or
* <code>ResultSet.TYPE_SCROLL_SENSITIVE</code>
* @param resultSetConcurrency a concurrency type; one of
* <code>ResultSet.CONCUR_READ_ONLY</code> or
* <code>ResultSet.CONCUR_UPDATABLE</code>
* @return a new <code>Statement</code> object that will generate
* <code>ResultSet</code> objects with the given type and
* concurrency
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection
* or the given parameters are not <code>ResultSet</code>
* constants indicating type and concurrency
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method or this method is not supported for the specified result
* set type and result set concurrency.
* @since 1.2
*/
Statement createStatement(int resultSetType, int resultSetConcurrency)
throws SQLException;
/**
*
* Creates a <code>PreparedStatement</code> object that will generate
* <code>ResultSet</code> objects with the given type and concurrency.
* This method is the same as the <code>prepareStatement</code> method
* above, but it allows the default result set
* type and concurrency to be overridden.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @param sql a <code>String</code> object that is the SQL statement to
* be sent to the database; may contain one or more '?' IN
* parameters
* @param resultSetType a result set type; one of
* <code>ResultSet.TYPE_FORWARD_ONLY</code>,
* <code>ResultSet.TYPE_SCROLL_INSENSITIVE</code>, or
* <code>ResultSet.TYPE_SCROLL_SENSITIVE</code>
* @param resultSetConcurrency a concurrency type; one of
* <code>ResultSet.CONCUR_READ_ONLY</code> or
* <code>ResultSet.CONCUR_UPDATABLE</code>
* @return a new PreparedStatement object containing the
* pre-compiled SQL statement that will produce <code>ResultSet</code>
* objects with the given type and concurrency
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection
* or the given parameters are not <code>ResultSet</code>
* constants indicating type and concurrency
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method or this method is not supported for the specified result
* set type and result set concurrency.
* @since 1.2
*/
PreparedStatement prepareStatement(String sql, int resultSetType,
int resultSetConcurrency)
throws SQLException;
/**
* Creates a <code>CallableStatement</code> object that will generate
* <code>ResultSet</code> objects with the given type and concurrency.
* This method is the same as the <code>prepareCall</code> method
* above, but it allows the default result set
* type and concurrency to be overridden.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @param sql a <code>String</code> object that is the SQL statement to
* be sent to the database; may contain on or more '?' parameters
* @param resultSetType a result set type; one of
* <code>ResultSet.TYPE_FORWARD_ONLY</code>,
* <code>ResultSet.TYPE_SCROLL_INSENSITIVE</code>, or
* <code>ResultSet.TYPE_SCROLL_SENSITIVE</code>
* @param resultSetConcurrency a concurrency type; one of
* <code>ResultSet.CONCUR_READ_ONLY</code> or
* <code>ResultSet.CONCUR_UPDATABLE</code>
* @return a new <code>CallableStatement</code> object containing the
* pre-compiled SQL statement that will produce <code>ResultSet</code>
* objects with the given type and concurrency
* @exception SQLException if a database access error occurs, this method
* is called on a closed connection
* or the given parameters are not <code>ResultSet</code>
* constants indicating type and concurrency
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method or this method is not supported for the specified result
* set type and result set concurrency.
* @since 1.2
*/
CallableStatement prepareCall(String sql, int resultSetType,
int resultSetConcurrency) throws SQLException;
/**
* Retrieves the <code>Map</code> object associated with this
* <code>Connection</code> object.
* Unless the application has added an entry, the type map returned
* will be empty.
* <p>
* You must invoke <code>setTypeMap</code> after making changes to the
* <code>Map</code> object returned from
* <code>getTypeMap</code> as a JDBC driver may create an internal
* copy of the <code>Map</code> object passed to <code>setTypeMap</code>:
*
* <pre>
* Map<String,Class<?>> myMap = con.getTypeMap();
* myMap.put("mySchemaName.ATHLETES", Athletes.class);
* con.setTypeMap(myMap);
* </pre>
* @return the <code>java.util.Map</code> object associated
* with this <code>Connection</code> object
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @since 1.2
* @see #setTypeMap
*/
java.util.Map<String,Class<?>> getTypeMap() throws SQLException;
/**
* Installs the given <code>TypeMap</code> object as the type map for
* this <code>Connection</code> object. The type map will be used for the
* custom mapping of SQL structured types and distinct types.
* <p>
* You must set the values for the <code>TypeMap</code> prior to
* callng <code>setMap</code> as a JDBC driver may create an internal copy
* of the <code>TypeMap</code>:
*
* <pre>
* Map myMap<String,Class<?>> = new HashMap<String,Class<?>>();
* myMap.put("mySchemaName.ATHLETES", Athletes.class);
* con.setTypeMap(myMap);
* </pre>
* @param map the <code>java.util.Map</code> object to install
* as the replacement for this <code>Connection</code>
* object's default type map
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection or
* the given parameter is not a <code>java.util.Map</code>
* object
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @since 1.2
* @see #getTypeMap
*/
void setTypeMap(java.util.Map<String,Class<?>> map) throws SQLException;
//--------------------------JDBC 3.0-----------------------------
/**
* Changes the default holdability of <code>ResultSet</code> objects
* created using this <code>Connection</code> object to the given
* holdability. The default holdability of <code>ResultSet</code> objects
* can be determined by invoking
* {@link DatabaseMetaData#getResultSetHoldability}.
*
* @param holdability a <code>ResultSet</code> holdability constant; one of
* <code>ResultSet.HOLD_CURSORS_OVER_COMMIT</code> or
* <code>ResultSet.CLOSE_CURSORS_AT_COMMIT</code>
* @throws SQLException if a database access occurs, this method is called
* on a closed connection, or the given parameter
* is not a <code>ResultSet</code> constant indicating holdability
* @exception SQLFeatureNotSupportedException if the given holdability is not supported
* @see #getHoldability
* @see DatabaseMetaData#getResultSetHoldability
* @see ResultSet
* @since 1.4
*/
void setHoldability(int holdability) throws SQLException;
/**
* Retrieves the current holdability of <code>ResultSet</code> objects
* created using this <code>Connection</code> object.
*
* @return the holdability, one of
* <code>ResultSet.HOLD_CURSORS_OVER_COMMIT</code> or
* <code>ResultSet.CLOSE_CURSORS_AT_COMMIT</code>
* @throws SQLException if a database access error occurs
* or this method is called on a closed connection
* @see #setHoldability
* @see DatabaseMetaData#getResultSetHoldability
* @see ResultSet
* @since 1.4
*/
int getHoldability() throws SQLException;
/**
* Creates an unnamed savepoint in the current transaction and
* returns the new <code>Savepoint</code> object that represents it.
*
*<p> if setSavepoint is invoked outside of an active transaction, a transaction will be started at this newly created
*savepoint.
*
* @return the new <code>Savepoint</code> object
* @exception SQLException if a database access error occurs,
* this method is called while participating in a distributed transaction,
* this method is called on a closed connection
* or this <code>Connection</code> object is currently in
* auto-commit mode
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @see Savepoint
* @since 1.4
*/
Savepoint setSavepoint() throws SQLException;
/**
* Creates a savepoint with the given name in the current transaction
* and returns the new <code>Savepoint</code> object that represents it.
*
* <p> if setSavepoint is invoked outside of an active transaction, a transaction will be started at this newly created
*savepoint.
*
* @param name a <code>String</code> containing the name of the savepoint
* @return the new <code>Savepoint</code> object
* @exception SQLException if a database access error occurs,
* this method is called while participating in a distributed transaction,
* this method is called on a closed connection
* or this <code>Connection</code> object is currently in
* auto-commit mode
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @see Savepoint
* @since 1.4
*/
Savepoint setSavepoint(String name) throws SQLException;
/**
* Undoes all changes made after the given <code>Savepoint</code> object
* was set.
* <P>
* This method should be used only when auto-commit has been disabled.
*
* @param savepoint the <code>Savepoint</code> object to roll back to
* @exception SQLException if a database access error occurs,
* this method is called while participating in a distributed transaction,
* this method is called on a closed connection,
* the <code>Savepoint</code> object is no longer valid,
* or this <code>Connection</code> object is currently in
* auto-commit mode
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @see Savepoint
* @see #rollback
* @since 1.4
*/
void rollback(Savepoint savepoint) throws SQLException;
/**
* Removes the specified <code>Savepoint</code> and subsequent <code>Savepoint</code> objects from the current
* transaction. Any reference to the savepoint after it have been removed
* will cause an <code>SQLException</code> to be thrown.
*
* @param savepoint the <code>Savepoint</code> object to be removed
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection or
* the given <code>Savepoint</code> object is not a valid
* savepoint in the current transaction
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @since 1.4
*/
void releaseSavepoint(Savepoint savepoint) throws SQLException;
/**
* Creates a <code>Statement</code> object that will generate
* <code>ResultSet</code> objects with the given type, concurrency,
* and holdability.
* This method is the same as the <code>createStatement</code> method
* above, but it allows the default result set
* type, concurrency, and holdability to be overridden.
*
* @param resultSetType one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.TYPE_FORWARD_ONLY</code>,
* <code>ResultSet.TYPE_SCROLL_INSENSITIVE</code>, or
* <code>ResultSet.TYPE_SCROLL_SENSITIVE</code>
* @param resultSetConcurrency one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.CONCUR_READ_ONLY</code> or
* <code>ResultSet.CONCUR_UPDATABLE</code>
* @param resultSetHoldability one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.HOLD_CURSORS_OVER_COMMIT</code> or
* <code>ResultSet.CLOSE_CURSORS_AT_COMMIT</code>
* @return a new <code>Statement</code> object that will generate
* <code>ResultSet</code> objects with the given type,
* concurrency, and holdability
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection
* or the given parameters are not <code>ResultSet</code>
* constants indicating type, concurrency, and holdability
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method or this method is not supported for the specified result
* set type, result set holdability and result set concurrency.
* @see ResultSet
* @since 1.4
*/
Statement createStatement(int resultSetType, int resultSetConcurrency,
int resultSetHoldability) throws SQLException;
/**
* Creates a <code>PreparedStatement</code> object that will generate
* <code>ResultSet</code> objects with the given type, concurrency,
* and holdability.
* <P>
* This method is the same as the <code>prepareStatement</code> method
* above, but it allows the default result set
* type, concurrency, and holdability to be overridden.
*
* @param sql a <code>String</code> object that is the SQL statement to
* be sent to the database; may contain one or more '?' IN
* parameters
* @param resultSetType one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.TYPE_FORWARD_ONLY</code>,
* <code>ResultSet.TYPE_SCROLL_INSENSITIVE</code>, or
* <code>ResultSet.TYPE_SCROLL_SENSITIVE</code>
* @param resultSetConcurrency one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.CONCUR_READ_ONLY</code> or
* <code>ResultSet.CONCUR_UPDATABLE</code>
* @param resultSetHoldability one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.HOLD_CURSORS_OVER_COMMIT</code> or
* <code>ResultSet.CLOSE_CURSORS_AT_COMMIT</code>
* @return a new <code>PreparedStatement</code> object, containing the
* pre-compiled SQL statement, that will generate
* <code>ResultSet</code> objects with the given type,
* concurrency, and holdability
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection
* or the given parameters are not <code>ResultSet</code>
* constants indicating type, concurrency, and holdability
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method or this method is not supported for the specified result
* set type, result set holdability and result set concurrency.
* @see ResultSet
* @since 1.4
*/
PreparedStatement prepareStatement(String sql, int resultSetType,
int resultSetConcurrency, int resultSetHoldability)
throws SQLException;
/**
* Creates a <code>CallableStatement</code> object that will generate
* <code>ResultSet</code> objects with the given type and concurrency.
* This method is the same as the <code>prepareCall</code> method
* above, but it allows the default result set
* type, result set concurrency type and holdability to be overridden.
*
* @param sql a <code>String</code> object that is the SQL statement to
* be sent to the database; may contain on or more '?' parameters
* @param resultSetType one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.TYPE_FORWARD_ONLY</code>,
* <code>ResultSet.TYPE_SCROLL_INSENSITIVE</code>, or
* <code>ResultSet.TYPE_SCROLL_SENSITIVE</code>
* @param resultSetConcurrency one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.CONCUR_READ_ONLY</code> or
* <code>ResultSet.CONCUR_UPDATABLE</code>
* @param resultSetHoldability one of the following <code>ResultSet</code>
* constants:
* <code>ResultSet.HOLD_CURSORS_OVER_COMMIT</code> or
* <code>ResultSet.CLOSE_CURSORS_AT_COMMIT</code>
* @return a new <code>CallableStatement</code> object, containing the
* pre-compiled SQL statement, that will generate
* <code>ResultSet</code> objects with the given type,
* concurrency, and holdability
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection
* or the given parameters are not <code>ResultSet</code>
* constants indicating type, concurrency, and holdability
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method or this method is not supported for the specified result
* set type, result set holdability and result set concurrency.
* @see ResultSet
* @since 1.4
*/
CallableStatement prepareCall(String sql, int resultSetType,
int resultSetConcurrency,
int resultSetHoldability) throws SQLException;
/**
* Creates a default <code>PreparedStatement</code> object that has
* the capability to retrieve auto-generated keys. The given constant
* tells the driver whether it should make auto-generated keys
* available for retrieval. This parameter is ignored if the SQL statement
* is not an <code>INSERT</code> statement, or an SQL statement able to return
* auto-generated keys (the list of such statements is vendor-specific).
* <P>
* <B>Note:</B> This method is optimized for handling
* parametric SQL statements that benefit from precompilation. If
* the driver supports precompilation,
* the method <code>prepareStatement</code> will send
* the statement to the database for precompilation. Some drivers
* may not support precompilation. In this case, the statement may
* not be sent to the database until the <code>PreparedStatement</code>
* object is executed. This has no direct effect on users; however, it does
* affect which methods throw certain SQLExceptions.
* <P>
* Result sets created using the returned <code>PreparedStatement</code>
* object will by default be type <code>TYPE_FORWARD_ONLY</code>
* and have a concurrency level of <code>CONCUR_READ_ONLY</code>.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @param sql an SQL statement that may contain one or more '?' IN
* parameter placeholders
* @param autoGeneratedKeys a flag indicating whether auto-generated keys
* should be returned; one of
* <code>Statement.RETURN_GENERATED_KEYS</code> or
* <code>Statement.NO_GENERATED_KEYS</code>
* @return a new <code>PreparedStatement</code> object, containing the
* pre-compiled SQL statement, that will have the capability of
* returning auto-generated keys
* @exception SQLException if a database access error occurs, this
* method is called on a closed connection
* or the given parameter is not a <code>Statement</code>
* constant indicating whether auto-generated keys should be
* returned
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method with a constant of Statement.RETURN_GENERATED_KEYS
* @since 1.4
*/
PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)
throws SQLException;
/**
* Creates a default <code>PreparedStatement</code> object capable
* of returning the auto-generated keys designated by the given array.
* This array contains the indexes of the columns in the target
* table that contain the auto-generated keys that should be made
* available. The driver will ignore the array if the SQL statement
* is not an <code>INSERT</code> statement, or an SQL statement able to return
* auto-generated keys (the list of such statements is vendor-specific).
*<p>
* An SQL statement with or without IN parameters can be
* pre-compiled and stored in a <code>PreparedStatement</code> object. This
* object can then be used to efficiently execute this statement
* multiple times.
* <P>
* <B>Note:</B> This method is optimized for handling
* parametric SQL statements that benefit from precompilation. If
* the driver supports precompilation,
* the method <code>prepareStatement</code> will send
* the statement to the database for precompilation. Some drivers
* may not support precompilation. In this case, the statement may
* not be sent to the database until the <code>PreparedStatement</code>
* object is executed. This has no direct effect on users; however, it does
* affect which methods throw certain SQLExceptions.
* <P>
* Result sets created using the returned <code>PreparedStatement</code>
* object will by default be type <code>TYPE_FORWARD_ONLY</code>
* and have a concurrency level of <code>CONCUR_READ_ONLY</code>.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @param sql an SQL statement that may contain one or more '?' IN
* parameter placeholders
* @param columnIndexes an array of column indexes indicating the columns
* that should be returned from the inserted row or rows
* @return a new <code>PreparedStatement</code> object, containing the
* pre-compiled statement, that is capable of returning the
* auto-generated keys designated by the given array of column
* indexes
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
*
* @since 1.4
*/
PreparedStatement prepareStatement(String sql, int columnIndexes[])
throws SQLException;
/**
* Creates a default <code>PreparedStatement</code> object capable
* of returning the auto-generated keys designated by the given array.
* This array contains the names of the columns in the target
* table that contain the auto-generated keys that should be returned.
* The driver will ignore the array if the SQL statement
* is not an <code>INSERT</code> statement, or an SQL statement able to return
* auto-generated keys (the list of such statements is vendor-specific).
* <P>
* An SQL statement with or without IN parameters can be
* pre-compiled and stored in a <code>PreparedStatement</code> object. This
* object can then be used to efficiently execute this statement
* multiple times.
* <P>
* <B>Note:</B> This method is optimized for handling
* parametric SQL statements that benefit from precompilation. If
* the driver supports precompilation,
* the method <code>prepareStatement</code> will send
* the statement to the database for precompilation. Some drivers
* may not support precompilation. In this case, the statement may
* not be sent to the database until the <code>PreparedStatement</code>
* object is executed. This has no direct effect on users; however, it does
* affect which methods throw certain SQLExceptions.
* <P>
* Result sets created using the returned <code>PreparedStatement</code>
* object will by default be type <code>TYPE_FORWARD_ONLY</code>
* and have a concurrency level of <code>CONCUR_READ_ONLY</code>.
* The holdability of the created result sets can be determined by
* calling {@link #getHoldability}.
*
* @param sql an SQL statement that may contain one or more '?' IN
* parameter placeholders
* @param columnNames an array of column names indicating the columns
* that should be returned from the inserted row or rows
* @return a new <code>PreparedStatement</code> object, containing the
* pre-compiled statement, that is capable of returning the
* auto-generated keys designated by the given array of column
* names
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
*
* @since 1.4
*/
PreparedStatement prepareStatement(String sql, String columnNames[])
throws SQLException;
/**
* Constructs an object that implements the <code>Clob</code> interface. The object
* returned initially contains no data. The <code>setAsciiStream</code>,
* <code>setCharacterStream</code> and <code>setString</code> methods of
* the <code>Clob</code> interface may be used to add data to the <code>Clob</code>.
* @return An object that implements the <code>Clob</code> interface
* @throws SQLException if an object that implements the
* <code>Clob</code> interface can not be constructed, this method is
* called on a closed connection or a database access error occurs.
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this data type
*
* @since 1.6
*/
Clob createClob() throws SQLException;
/**
* Constructs an object that implements the <code>Blob</code> interface. The object
* returned initially contains no data. The <code>setBinaryStream</code> and
* <code>setBytes</code> methods of the <code>Blob</code> interface may be used to add data to
* the <code>Blob</code>.
* @return An object that implements the <code>Blob</code> interface
* @throws SQLException if an object that implements the
* <code>Blob</code> interface can not be constructed, this method is
* called on a closed connection or a database access error occurs.
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this data type
*
* @since 1.6
*/
Blob createBlob() throws SQLException;
/**
* Constructs an object that implements the <code>NClob</code> interface. The object
* returned initially contains no data. The <code>setAsciiStream</code>,
* <code>setCharacterStream</code> and <code>setString</code> methods of the <code>NClob</code> interface may
* be used to add data to the <code>NClob</code>.
* @return An object that implements the <code>NClob</code> interface
* @throws SQLException if an object that implements the
* <code>NClob</code> interface can not be constructed, this method is
* called on a closed connection or a database access error occurs.
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this data type
*
* @since 1.6
*/
NClob createNClob() throws SQLException;
/**
* Constructs an object that implements the <code>SQLXML</code> interface. The object
* returned initially contains no data. The <code>createXmlStreamWriter</code> object and
* <code>setString</code> method of the <code>SQLXML</code> interface may be used to add data to the <code>SQLXML</code>
* object.
* @return An object that implements the <code>SQLXML</code> interface
* @throws SQLException if an object that implements the <code>SQLXML</code> interface can not
* be constructed, this method is
* called on a closed connection or a database access error occurs.
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this data type
* @since 1.6
*/
SQLXML createSQLXML() throws SQLException;
/**
* Returns true if the connection has not been closed and is still valid.
* The driver shall submit a query on the connection or use some other
* mechanism that positively verifies the connection is still valid when
* this method is called.
* <p>
* The query submitted by the driver to validate the connection shall be
* executed in the context of the current transaction.
*
* @param timeout - The time in seconds to wait for the database operation
* used to validate the connection to complete. If
* the timeout period expires before the operation
* completes, this method returns false. A value of
* 0 indicates a timeout is not applied to the
* database operation.
*
* @return true if the connection is valid, false otherwise
* @exception SQLException if the value supplied for <code>timeout</code>
* is less than 0
* @since 1.6
*
* @see java.sql.DatabaseMetaData#getClientInfoProperties
*/
boolean isValid(int timeout) throws SQLException;
/**
* Sets the value of the client info property specified by name to the
* value specified by value.
* <p>
* Applications may use the <code>DatabaseMetaData.getClientInfoProperties</code>
* method to determine the client info properties supported by the driver
* and the maximum length that may be specified for each property.
* <p>
* The driver stores the value specified in a suitable location in the
* database. For example in a special register, session parameter, or
* system table column. For efficiency the driver may defer setting the
* value in the database until the next time a statement is executed or
* prepared. Other than storing the client information in the appropriate
* place in the database, these methods shall not alter the behavior of
* the connection in anyway. The values supplied to these methods are
* used for accounting, diagnostics and debugging purposes only.
* <p>
* The driver shall generate a warning if the client info name specified
* is not recognized by the driver.
* <p>
* If the value specified to this method is greater than the maximum
* length for the property the driver may either truncate the value and
* generate a warning or generate a <code>SQLClientInfoException</code>. If the driver
* generates a <code>SQLClientInfoException</code>, the value specified was not set on the
* connection.
* <p>
* The following are standard client info properties. Drivers are not
* required to support these properties however if the driver supports a
* client info property that can be described by one of the standard
* properties, the standard property name should be used.
*
* <ul>
* <li>ApplicationName - The name of the application currently utilizing
* the connection</li>
* <li>ClientUser - The name of the user that the application using
* the connection is performing work for. This may
* not be the same as the user name that was used
* in establishing the connection.</li>
* <li>ClientHostname - The hostname of the computer the application
* using the connection is running on.</li>
* </ul>
*
* @param name The name of the client info property to set
* @param value The value to set the client info property to. If the
* value is null, the current value of the specified
* property is cleared.
*
* @throws SQLClientInfoException if the database server returns an error while
* setting the client info value on the database server or this method
* is called on a closed connection
*
* @since 1.6
*/
void setClientInfo(String name, String value)
throws SQLClientInfoException;
/**
* Sets the value of the connection's client info properties. The
* <code>Properties</code> object contains the names and values of the client info
* properties to be set. The set of client info properties contained in
* the properties list replaces the current set of client info properties
* on the connection. If a property that is currently set on the
* connection is not present in the properties list, that property is
* cleared. Specifying an empty properties list will clear all of the
* properties on the connection. See <code>setClientInfo (String, String)</code> for
* more information.
* <p>
* If an error occurs in setting any of the client info properties, a
* <code>SQLClientInfoException</code> is thrown. The <code>SQLClientInfoException</code>
* contains information indicating which client info properties were not set.
* The state of the client information is unknown because
* some databases do not allow multiple client info properties to be set
* atomically. For those databases, one or more properties may have been
* set before the error occurred.
*
*
* @param properties the list of client info properties to set
*
* @see java.sql.Connection#setClientInfo(String, String) setClientInfo(String, String)
* @since 1.6
*
* @throws SQLClientInfoException if the database server returns an error while
* setting the clientInfo values on the database server or this method
* is called on a closed connection
*
*/
void setClientInfo(Properties properties)
throws SQLClientInfoException;
/**
* Returns the value of the client info property specified by name. This
* method may return null if the specified client info property has not
* been set and does not have a default value. This method will also
* return null if the specified client info property name is not supported
* by the driver.
* <p>
* Applications may use the <code>DatabaseMetaData.getClientInfoProperties</code>
* method to determine the client info properties supported by the driver.
*
* @param name The name of the client info property to retrieve
*
* @return The value of the client info property specified
*
* @throws SQLException if the database server returns an error when
* fetching the client info value from the database
* or this method is called on a closed connection
*
* @since 1.6
*
* @see java.sql.DatabaseMetaData#getClientInfoProperties
*/
String getClientInfo(String name)
throws SQLException;
/**
* Returns a list containing the name and current value of each client info
* property supported by the driver. The value of a client info property
* may be null if the property has not been set and does not have a
* default value.
*
* @return A <code>Properties</code> object that contains the name and current value of
* each of the client info properties supported by the driver.
*
* @throws SQLException if the database server returns an error when
* fetching the client info values from the database
* or this method is called on a closed connection
*
* @since 1.6
*/
Properties getClientInfo()
throws SQLException;
/**
* Factory method for creating Array objects.
*<p>
* <b>Note: </b>When <code>createArrayOf</code> is used to create an array object
* that maps to a primitive data type, then it is implementation-defined
* whether the <code>Array</code> object is an array of that primitive
* data type or an array of <code>Object</code>.
* <p>
* <b>Note: </b>The JDBC driver is responsible for mapping the elements
* <code>Object</code> array to the default JDBC SQL type defined in
* java.sql.Types for the given class of <code>Object</code>. The default
* mapping is specified in Appendix B of the JDBC specification. If the
* resulting JDBC type is not the appropriate type for the given typeName then
* it is implementation defined whether an <code>SQLException</code> is
* thrown or the driver supports the resulting conversion.
*
* @param typeName the SQL name of the type the elements of the array map to. The typeName is a
* database-specific name which may be the name of a built-in type, a user-defined type or a standard SQL type supported by this database. This
* is the value returned by <code>Array.getBaseTypeName</code>
* @param elements the elements that populate the returned object
* @return an Array object whose elements map to the specified SQL type
* @throws SQLException if a database error occurs, the JDBC type is not
* appropriate for the typeName and the conversion is not supported, the typeName is null or this method is called on a closed connection
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this data type
* @since 1.6
*/
Array createArrayOf(String typeName, Object[] elements) throws
SQLException;
/**
* Factory method for creating Struct objects.
*
* @param typeName the SQL type name of the SQL structured type that this <code>Struct</code>
* object maps to. The typeName is the name of a user-defined type that
* has been defined for this database. It is the value returned by
* <code>Struct.getSQLTypeName</code>.
* @param attributes the attributes that populate the returned object
* @return a Struct object that maps to the given SQL type and is populated with the given attributes
* @throws SQLException if a database error occurs, the typeName is null or this method is called on a closed connection
* @throws SQLFeatureNotSupportedException if the JDBC driver does not support this data type
* @since 1.6
*/
Struct createStruct(String typeName, Object[] attributes)
throws SQLException;
//--------------------------JDBC 4.1 -----------------------------
/**
* Sets the given schema name to access.
* <P>
* If the driver does not support schemas, it will
* silently ignore this request.
* <p>
* Calling {@code setSchema} has no effect on previously created or prepared
* {@code Statement} objects. It is implementation defined whether a DBMS
* prepare operation takes place immediately when the {@code Connection}
* method {@code prepareStatement} or {@code prepareCall} is invoked.
* For maximum portability, {@code setSchema} should be called before a
* {@code Statement} is created or prepared.
*
* @param schema the name of a schema in which to work
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @see #getSchema
* @since 1.7
*/
void setSchema(String schema) throws SQLException;
/**
* Retrieves this <code>Connection</code> object's current schema name.
*
* @return the current schema name or <code>null</code> if there is none
* @exception SQLException if a database access error occurs
* or this method is called on a closed connection
* @see #setSchema
* @since 1.7
*/
String getSchema() throws SQLException;
/**
* Terminates an open connection. Calling <code>abort</code> results in:
* <ul>
* <li>The connection marked as closed
* <li>Closes any physical connection to the database
* <li>Releases resources used by the connection
* <li>Insures that any thread that is currently accessing the connection
* will either progress to completion or throw an <code>SQLException</code>.
* </ul>
* <p>
* Calling <code>abort</code> marks the connection closed and releases any
* resources. Calling <code>abort</code> on a closed connection is a
* no-op.
* <p>
* It is possible that the aborting and releasing of the resources that are
* held by the connection can take an extended period of time. When the
* <code>abort</code> method returns, the connection will have been marked as
* closed and the <code>Executor</code> that was passed as a parameter to abort
* may still be executing tasks to release resources.
* <p>
* This method checks to see that there is an <code>SQLPermission</code>
* object before allowing the method to proceed. If a
* <code>SecurityManager</code> exists and its
* <code>checkPermission</code> method denies calling <code>abort</code>,
* this method throws a
* <code>java.lang.SecurityException</code>.
* @param executor The <code>Executor</code> implementation which will
* be used by <code>abort</code>.
* @throws java.sql.SQLException if a database access error occurs or
* the {@code executor} is {@code null},
* @throws java.lang.SecurityException if a security manager exists and its
* <code>checkPermission</code> method denies calling <code>abort</code>
* @see SecurityManager#checkPermission
* @see Executor
* @since 1.7
*/
void abort(Executor executor) throws SQLException;
/**
*
* Sets the maximum period a <code>Connection</code> or
* objects created from the <code>Connection</code>
* will wait for the database to reply to any one request. If any
* request remains unanswered, the waiting method will
* return with a <code>SQLException</code>, and the <code>Connection</code>
* or objects created from the <code>Connection</code> will be marked as
* closed. Any subsequent use of
* the objects, with the exception of the <code>close</code>,
* <code>isClosed</code> or <code>Connection.isValid</code>
* methods, will result in a <code>SQLException</code>.
* <p>
* <b>Note</b>: This method is intended to address a rare but serious
* condition where network partitions can cause threads issuing JDBC calls
* to hang uninterruptedly in socket reads, until the OS TCP-TIMEOUT
* (typically 10 minutes). This method is related to the
* {@link #abort abort() } method which provides an administrator
* thread a means to free any such threads in cases where the
* JDBC connection is accessible to the administrator thread.
* The <code>setNetworkTimeout</code> method will cover cases where
* there is no administrator thread, or it has no access to the
* connection. This method is severe in it's effects, and should be
* given a high enough value so it is never triggered before any more
* normal timeouts, such as transaction timeouts.
* <p>
* JDBC driver implementations may also choose to support the
* {@code setNetworkTimeout} method to impose a limit on database
* response time, in environments where no network is present.
* <p>
* Drivers may internally implement some or all of their API calls with
* multiple internal driver-database transmissions, and it is left to the
* driver implementation to determine whether the limit will be
* applied always to the response to the API call, or to any
* single request made during the API call.
* <p>
*
* This method can be invoked more than once, such as to set a limit for an
* area of JDBC code, and to reset to the default on exit from this area.
* Invocation of this method has no impact on already outstanding
* requests.
* <p>
* The {@code Statement.setQueryTimeout()} timeout value is independent of the
* timeout value specified in {@code setNetworkTimeout}. If the query timeout
* expires before the network timeout then the
* statement execution will be canceled. If the network is still
* active the result will be that both the statement and connection
* are still usable. However if the network timeout expires before
* the query timeout or if the statement timeout fails due to network
* problems, the connection will be marked as closed, any resources held by
* the connection will be released and both the connection and
* statement will be unusable.
* <p>
* When the driver determines that the {@code setNetworkTimeout} timeout
* value has expired, the JDBC driver marks the connection
* closed and releases any resources held by the connection.
* <p>
*
* This method checks to see that there is an <code>SQLPermission</code>
* object before allowing the method to proceed. If a
* <code>SecurityManager</code> exists and its
* <code>checkPermission</code> method denies calling
* <code>setNetworkTimeout</code>, this method throws a
* <code>java.lang.SecurityException</code>.
*
* @param executor The <code>Executor</code> implementation which will
* be used by <code>setNetworkTimeout</code>.
* @param milliseconds The time in milliseconds to wait for the database
* operation
* to complete. If the JDBC driver does not support milliseconds, the
* JDBC driver will round the value up to the nearest second. If the
* timeout period expires before the operation
* completes, a SQLException will be thrown.
* A value of 0 indicates that there is not timeout for database operations.
* @throws java.sql.SQLException if a database access error occurs, this
* method is called on a closed connection,
* the {@code executor} is {@code null},
* or the value specified for <code>seconds</code> is less than 0.
* @throws java.lang.SecurityException if a security manager exists and its
* <code>checkPermission</code> method denies calling
* <code>setNetworkTimeout</code>.
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @see SecurityManager#checkPermission
* @see Statement#setQueryTimeout
* @see #getNetworkTimeout
* @see #abort
* @see Executor
* @since 1.7
*/
void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException;
/**
* Retrieves the number of milliseconds the driver will
* wait for a database request to complete.
* If the limit is exceeded, a
* <code>SQLException</code> is thrown.
*
* @return the current timeout limit in milliseconds; zero means there is
* no limit
* @throws SQLException if a database access error occurs or
* this method is called on a closed <code>Connection</code>
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @see #setNetworkTimeout
* @since 1.7
*/
int getNetworkTimeout() throws SQLException;
// JDBC 4.3
/**
* Hints to the driver that a request, an independent unit of work, is beginning
* on this connection. Each request is independent of all other requests
* with regard to state local to the connection either on the client or the
* server. Work done between {@code beginRequest}, {@code endRequest}
* pairs does not depend on any other work done on the connection either as
* part of another request or outside of any request. A request may include multiple
* transactions. There may be dependencies on committed database state as
* that is not local to the connection.
* <p>
* Local state is defined as any state associated with a Connection that is
* local to the current Connection either in the client or the database that
* is not transparently reproducible.
* <p>
* Calls to {@code beginRequest} and {@code endRequest} are not nested.
* Multiple calls to {@code beginRequest} without an intervening call
* to {@code endRequest} is not an error. The first {@code beginRequest} call
* marks the start of the request and subsequent calls are treated as
* a no-op
* <p>
* Use of {@code beginRequest} and {@code endRequest} is optional, vendor
* specific and should largely be transparent. In particular
* implementations may detect conditions that indicate dependence on
* other work such as an open transaction. It is recommended though not
* required that implementations throw a {@code SQLException} if there is an active
* transaction and {@code beginRequest} is called.
* Using these methods may improve performance or provide other benefits.
* Consult your vendors documentation for additional information.
* <p>
* It is recommended to
* enclose each unit of work in {@code beginRequest}, {@code endRequest}
* pairs such that there is no open transaction at the beginning or end of
* the request and no dependency on local state that crosses request
* boundaries. Committed database state is not local.
*
* @implSpec
* The default implementation is a no-op.
*
* @apiNote
* This method is to be used by Connection pooling managers.
* <p>
* The pooling manager should call {@code beginRequest} on the underlying connection
* prior to returning a connection to the caller.
* <p>
* The pooling manager does not need to call {@code beginRequest} if:
* <ul>
* <li>The connection pool caches {@code PooledConnection} objects</li>
* <li>Returns a logical connection handle when {@code getConnection} is
* called by the application</li>
* <li>The logical {@code Connection} is closed by calling
* {@code Connection.close} prior to returning the {@code PooledConnection}
* to the cache.</li>
* </ul>
* @throws SQLException if an error occurs
* @since 9
* @see endRequest
* @see javax.sql.PooledConnection
*/
default void beginRequest() throws SQLException {
// Default method takes no action
}
/**
* Hints to the driver that a request, an independent unit of work,
* has completed. Calls to {@code beginRequest}
* and {@code endRequest} are not nested. Multiple
* calls to {@code endRequest} without an intervening call to {@code beginRequest}
* is not an error. The first {@code endRequest} call
* marks the request completed and subsequent calls are treated as
* a no-op. If {@code endRequest} is called without an initial call to
* {@code beginRequest} is a no-op.
*<p>
* The exact behavior of this method is vendor specific. In particular
* implementations may detect conditions that indicate dependence on
* other work such as an open transaction. It is recommended though not
* required that implementations throw a {@code SQLException} if there is an active
* transaction and {@code endRequest} is called.
*
* @implSpec
* The default implementation is a no-op.
* @apiNote
*
* This method is to be used by Connection pooling managers.
* <p>
* The pooling manager should call {@code endRequest} on the underlying connection
* when the applications returns the connection back to the connection pool.
* <p>
* The pooling manager does not need to call {@code endRequest} if:
* <ul>
* <li>The connection pool caches {@code PooledConnection} objects</li>
* <li>Returns a logical connection handle when {@code getConnection} is
* called by the application</li>
* <li>The logical {@code Connection} is closed by calling
* {@code Connection.close} prior to returning the {@code PooledConnection}
* to the cache.</li>
* </ul>
* @throws SQLException if an error occurs
* @since 9
* @see beginRequest
* @see javax.sql.PooledConnection
*/
default void endRequest() throws SQLException {
// Default method takes no action
}
/**
* Sets and validates the sharding keys for this connection. A {@code null}
* value may be specified for the sharding Key. The validity
* of a {@code null} sharding key is vendor-specific. Consult your vendor's
* documentation for additional information.
* @implSpec
* The default implementation will throw a
* {@code SQLFeatureNotSupportedException}.
*
* @apiNote
* This method validates that the sharding keys are valid for the
* {@code Connection}. The timeout value indicates how long the driver
* should wait for the {@code Connection} to verify that the sharding key
* is valid before {@code setShardingKeyIfValid} returns false.
* @param shardingKey the sharding key to be validated against this connection.
* The sharding key may be {@code null}
* @param superShardingKey the super sharding key to be validated against this
* connection. The super sharding key may be {@code null}.
* @param timeout time in seconds before which the validation process is expected to
* be completed, otherwise the validation process is aborted. A value of 0 indicates
* the validation process will not time out.
* @return true if the connection is valid and the sharding keys are valid
* and set on this connection; false if the sharding keys are not valid or
* the timeout period expires before the operation completes.
* @throws SQLException if an error occurs while performing this validation;
* a {@code superSharedingKey} is specified
* without a {@code shardingKey};
* this method is called on a closed {@code connection}; or
* the {@code timeout} value is negative.
* @throws SQLFeatureNotSupportedException if the driver does not support sharding
* @since 9
* @see ShardingKey
* @see ShardingKeyBuilder
*/
default boolean setShardingKeyIfValid(ShardingKey shardingKey,
ShardingKey superShardingKey, int timeout)
throws SQLException {
throw new SQLFeatureNotSupportedException("setShardingKeyIfValid not implemented");
}
/**
* Sets and validates the sharding key for this connection. A {@code null}
* value may be specified for the sharding Key. The validity
* of a {@code null} sharding key is vendor-specific. Consult your vendor's
* documentation for additional information.
* @implSpec
* The default implementation will throw a
* {@code SQLFeatureNotSupportedException}.
* @apiNote
* This method validates that the sharding key is valid for the
* {@code Connection}. The timeout value indicates how long the driver
* should wait for the {@code Connection} to verify that the sharding key
* is valid before {@code setShardingKeyIfValid} returns false.
* @param shardingKey the sharding key to be validated against this connection.
* The sharding key may be {@code null}
* @param timeout time in seconds before which the validation process is expected to
* be completed,else the validation process is aborted. A value of 0 indicates
* the validation process will not time out.
* @return true if the connection is valid and the sharding key is valid to be
* set on this connection; false if the sharding key is not valid or
* the timeout period expires before the operation completes.
* @throws SQLException if there is an error while performing this validation;
* this method is called on a closed {@code connection};
* or the {@code timeout} value is negative.
* @throws SQLFeatureNotSupportedException if the driver does not support sharding
* @since 9
* @see ShardingKey
* @see ShardingKeyBuilder
*/
default boolean setShardingKeyIfValid(ShardingKey shardingKey, int timeout)
throws SQLException {
throw new SQLFeatureNotSupportedException("setShardingKeyIfValid not implemented");
}
/**
* Specifies a shardingKey and superShardingKey to use with this Connection
* @implSpec
* The default implementation will throw a
* {@code SQLFeatureNotSupportedException}.
* @apiNote
* This method sets the specified sharding keys but does not require a
* round trip to the database to validate that the sharding keys are valid
* for the {@code Connection}.
* @param shardingKey the sharding key to set on this connection. The sharding
* key may be {@code null}
* @param superShardingKey the super sharding key to set on this connection.
* The super sharding key may be {@code null}
* @throws SQLException if an error occurs setting the sharding keys;
* this method is called on a closed {@code connection}; or
* a {@code superSharedingKey} is specified without a {@code shardingKey}
* @throws SQLFeatureNotSupportedException if the driver does not support sharding
* @since 9
* @see ShardingKey
* @see ShardingKeyBuilder
*/
default void setShardingKey(ShardingKey shardingKey, ShardingKey superShardingKey)
throws SQLException {
throw new SQLFeatureNotSupportedException("setShardingKey not implemented");
}
/**
* Specifies a shardingKey to use with this Connection
* @implSpec
* The default implementation will throw a
* {@code SQLFeatureNotSupportedException}.
* @apiNote
* This method sets the specified sharding key but does not require a
* round trip to the database to validate that the sharding key is valid
* for the {@code Connection}.
* @param shardingKey the sharding key to set on this connection. The sharding
* key may be {@code null}
* @throws SQLException if an error occurs setting the sharding key; or
* this method is called on a closed {@code connection}
* @throws SQLFeatureNotSupportedException if the driver does not support sharding
* @since 9
* @see ShardingKey
* @see ShardingKeyBuilder
*/
default void setShardingKey(ShardingKey shardingKey)
throws SQLException {
throw new SQLFeatureNotSupportedException("setShardingKey not implemented");
}
}