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package javax.sql.rowset;

import java.sql.*;

import javax.sql.*;

import javax.naming.*;

import java.io.*;

import java.math.*;

import java.io.*;

/**

 * The standard interface that all standard implementations of

 * <code>JdbcRowSet</code> must implement.

 *

 * <h2>1.0 Overview</h2>

 * A wrapper around a <code>ResultSet</code> object that makes it possible

 * to use the result set as a JavaBeans™

 * component.  Thus, a <code>JdbcRowSet</code> object can be one of the Beans that

 * a tool makes available for composing an application.  Because

 * a <code>JdbcRowSet</code> is a connected rowset, that is, it continually

 * maintains its connection to a database using a JDBC technology-enabled

 * driver, it also effectively makes the driver a JavaBeans component.

 * <P>

 * Because it is always connected to its database, an instance of

 * <code>JdbcRowSet</code>

 * can simply take calls invoked on it and in turn call them on its

 * <code>ResultSet</code> object. As a consequence, a result set can, for

 * example, be a component in a Swing application.

 * <P>

 * Another advantage of a <code>JdbcRowSet</code> object is that it can be

 * used to make a <code>ResultSet</code> object scrollable and updatable.  All

 * <code>RowSet</code> objects are by default scrollable and updatable. If

 * the driver and database being used do not support scrolling and/or updating

 * of result sets, an application can populate a <code>JdbcRowSet</code> object

 * with the data of a <code>ResultSet</code> object and then operate on the

 * <code>JdbcRowSet</code> object as if it were the <code>ResultSet</code>

 * object.

 *

 * <h2>2.0 Creating a <code>JdbcRowSet</code> Object</h2>

 * The reference implementation of the <code>JdbcRowSet</code> interface,

 * <code>JdbcRowSetImpl</code>, provides an implementation of

 * the default constructor.  A new instance is initialized with

 * default values, which can be set with new values as needed. A

 * new instance is not really functional until its <code>execute</code>

 * method is called. In general, this method does the following:

 * <UL>

 *   <LI> establishes a connection with a database

 *   <LI> creates a <code>PreparedStatement</code> object and sets any of its

 *        placeholder parameters

 *   <LI> executes the statement to create a <code>ResultSet</code> object

 * </UL>

 * If the <code>execute</code> method is successful, it will set the

 * appropriate private <code>JdbcRowSet</code> fields with the following:

 * <UL>

 *  <LI> a <code>Connection</code> object -- the connection between the rowset

 *       and the database

 *  <LI> a <code>PreparedStatement</code> object -- the query that produces

 *       the result set

 *  <LI> a <code>ResultSet</code> object -- the result set that the rowset's

 *       command produced and that is being made, in effect, a JavaBeans

 *       component

 * </UL>

 * If these fields have not been set, meaning that the <code>execute</code>

 * method has not executed successfully, no methods other than

 * <code>execute</code> and <code>close</code> may be called on the

 * rowset.  All other public methods will throw an exception.

 * <P>

 * Before calling the <code>execute</code> method, however, the command

 * and properties needed for establishing a connection must be set.

 * The following code fragment creates a <code>JdbcRowSetImpl</code> object,

 * sets the command and connection properties, sets the placeholder parameter,

 * and then invokes the method <code>execute</code>.

 * <PRE>

 *     JdbcRowSetImpl jrs = new JdbcRowSetImpl();

 *     jrs.setCommand("SELECT * FROM TITLES WHERE TYPE = ?");

 *     jrs.setURL("jdbc:myDriver:myAttribute");

 *     jrs.setUsername("cervantes");

 *     jrs.setPassword("sancho");

 *     jrs.setString(1, "BIOGRAPHY");

 *     jrs.execute();

 * </PRE>

 * The variable <code>jrs</code> now represents an instance of

 * <code>JdbcRowSetImpl</code> that is a thin wrapper around the

 * <code>ResultSet</code> object containing all the rows in the

 * table <code>TITLES</code> where the type of book is biography.

 * At this point, operations called on <code>jrs</code> will

 * affect the rows in the result set, which is effectively a JavaBeans

 * component.

 * <P>

 * The implementation of the <code>RowSet</code> method <code>execute</code> in the

 * <code>JdbcRowSet</code> reference implementation differs from that in the

 * <code>CachedRowSet</code>&trade;

 * reference implementation to account for the different

 * requirements of connected and disconnected <code>RowSet</code> objects.

 *

 * @author Jonathan Bruce

 * @since 1.5

 */

public interface JdbcRowSet extends RowSet, Joinable {

    /**

     * Retrieves a <code>boolean</code> indicating whether rows marked

     * for deletion appear in the set of current rows. If <code>true</code> is

     * returned, deleted rows are visible with the current rows. If

     * <code>false</code> is returned, rows are not visible with the set of

     * current rows. The default value is <code>false</code>.

     * <P>

     * Standard rowset implementations may choose to restrict this behavior

     * for security considerations or for certain deployment

     * scenarios. The visibility of deleted rows is implementation-defined

     * and does not represent standard behavior.

     * <P>

     * Note: Allowing deleted rows to remain visible complicates the behavior

     * of some standard JDBC <code>RowSet</code> implementations methods.

     * However, most rowset users can simply ignore this extra detail because

     * only very specialized applications will likely want to take advantage of

     * this feature.

     *

     * @return <code>true</code> if deleted rows are visible;

     *         <code>false</code> otherwise

     * @exception SQLException if a rowset implementation is unable to

     *          to determine whether rows marked for deletion remain visible

     * @see #setShowDeleted

     */

    public boolean getShowDeleted() throws SQLException;

    /**

     * Sets the property <code>showDeleted</code> to the given

     * <code>boolean</code> value. This property determines whether

     * rows marked for deletion continue to appear in the set of current rows.

     * If the value is set to <code>true</code>, deleted rows are immediately

     * visible with the set of current rows. If the value is set to

     * <code>false</code>, the deleted rows are set as invisible with the

     * current set of rows.

     * <P>

     * Standard rowset implementations may choose to restrict this behavior

     * for security considerations or for certain deployment

     * scenarios. This is left as implementation-defined and does not

     * represent standard behavior.

     *

     * @param b <code>true</code> if deleted rows should be shown;

     *              <code>false</code> otherwise

     * @exception SQLException if a rowset implementation is unable to

     *          to reset whether deleted rows should be visible

     * @see #getShowDeleted

     */

    public void setShowDeleted(boolean b) throws SQLException;

    /**

     * Retrieves the first warning reported by calls on this <code>JdbcRowSet</code>

     * object.

     * If a second warning was reported on this <code>JdbcRowSet</code> object,

     * it will be chained to the first warning and can be retrieved by

     * calling the method <code>RowSetWarning.getNextWarning</code> on the

     * first warning. Subsequent warnings on this <code>JdbcRowSet</code>

     * object will be chained to the <code>RowSetWarning</code> objects

     * returned by the method <code>RowSetWarning.getNextWarning</code>.

     *

     * The warning chain is automatically cleared each time a new row is read.

     * This method may not be called on a <code>RowSet</code> object

     * that has been closed;

     * doing so will cause an <code>SQLException</code> to be thrown.

     * <P>

     * Because it is always connected to its data source, a <code>JdbcRowSet</code>

     * object can rely on the presence of active

     * <code>Statement</code>, <code>Connection</code>, and <code>ResultSet</code>

     * instances. This means that  applications can obtain additional

     * <code>SQLWarning</code>

     * notifications by calling the <code>getNextWarning</code> methods that

     * they provide.

     * Disconnected <code>Rowset</code> objects, such as a

     * <code>CachedRowSet</code> object, do not have access to

     * these <code>getNextWarning</code> methods.

     *

     * @return the first <code>RowSetWarning</code>

     * object reported on this <code>JdbcRowSet</code> object

     * or <code>null</code> if there are none

     * @throws SQLException if this method is called on a closed

     * <code>JdbcRowSet</code> object

     * @see RowSetWarning

     */

    public RowSetWarning getRowSetWarnings() throws SQLException;

   /**

    * Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from

    * the <code>ResultSet</code> or JDBC properties passed to it's constructors.

    * This method wraps the <code>Connection</code> commit method to allow flexible

    * auto commit or non auto commit transactional control support.

    * <p>

    * Makes all changes made since the previous commit/rollback permanent

    * and releases any database locks currently held by this Connection

    * object. This method should be used only when auto-commit mode has

    * been disabled.

    *

    * @throws SQLException if a database access error occurs or this

    * Connection object within this <code>JdbcRowSet</code> is in auto-commit mode

    * @see java.sql.Connection#setAutoCommit

    */

    public void commit() throws SQLException;

   /**

    * Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from

    * the original <code>ResultSet</code> or JDBC properties passed to it. This

    * method wraps the <code>Connection</code>'s <code>getAutoCommit</code> method

    * to allow an application to determine the <code>JdbcRowSet</code> transaction

    * behavior.

    * <p>

    * 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 commit or the method rollback. By default,

    * new connections are in auto-commit mode.

    *

    * @return {@code true} if auto-commit is enabled; {@code false} otherwise

    * @throws SQLException if a database access error occurs

    * @see java.sql.Connection#getAutoCommit()

    */

    public boolean getAutoCommit() throws SQLException;

   /**

    * Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from

    * the original <code>ResultSet</code> or JDBC properties passed to it. This

    * method wraps the <code>Connection</code>'s <code>getAutoCommit</code> method

    * to allow an application to set the <code>JdbcRowSet</code> transaction behavior.

    * <p>

    * Sets the current auto-commit mode for this <code>Connection</code> object.

    * @param autoCommit {@code true} to enable auto-commit; {@code false} to

    * disable auto-commit

    * @throws SQLException if a database access error occurs

    * @see java.sql.Connection#setAutoCommit(boolean)

    */

    public void setAutoCommit(boolean autoCommit) throws SQLException;

    /**

     * Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from

     * the original <code>ResultSet</code> or JDBC properties passed to it.

     * 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.

     *

     * @throws SQLException if a database access error occurs or this <code>Connection</code>

     * object within this <code>JdbcRowSet</code> is in auto-commit mode.

     * @see #rollback(Savepoint)

     */

     public void rollback() throws SQLException;

    /**

     * Each <code>JdbcRowSet</code> contains a <code>Connection</code> object from

     * the original <code>ResultSet</code> or JDBC properties passed to it.

     * Undoes all changes made in the current transaction to the last set savepoint

     * 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.

     * @param s The {@code Savepoint} to rollback to

     * @throws SQLException if a database access error occurs or this <code>Connection</code>

     * object within this <code>JdbcRowSet</code> is in auto-commit mode.

     * @see #rollback

     */

    public void rollback(Savepoint s) throws SQLException;

}