/**
* SQL-DK
* Copyright © 2013 František Kučera (frantovo.cz)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package info.globalcode.sql.dk;
import info.globalcode.sql.dk.batch.Batch;
import info.globalcode.sql.dk.configuration.DatabaseDefinition;
import info.globalcode.sql.dk.formatting.ColumnsHeader;
import info.globalcode.sql.dk.formatting.Formatter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
*
* @author Ing. František Kučera (frantovo.cz)
*/
public class DatabaseConnection implements AutoCloseable {
private DatabaseDefinition databaseDefinition;
private Connection connection;
public DatabaseConnection(DatabaseDefinition databaseDefinition) throws SQLException {
this.databaseDefinition = databaseDefinition;
connection = DriverManager.getConnection(databaseDefinition.getUrl(), databaseDefinition.getUserName(), databaseDefinition.getPassword());
}
public void executeQuery(SQLCommand sqlCommand, Formatter formatter) throws SQLException {
formatter.writeStartDatabase(databaseDefinition);
processCommand(sqlCommand, formatter);
formatter.writeEndDatabase();
}
public void executeBatch(Batch batch, Formatter formatter) throws SQLException {
formatter.writeStartDatabase(databaseDefinition);
while (batch.hasNext()) {
processCommand(batch.next(), formatter);
}
formatter.writeEndDatabase();
}
private void processCommand(SQLCommand sqlCommand, Formatter formatter) throws SQLException {
try (PreparedStatement ps = sqlCommand.prepareStatement(connection)) {
sqlCommand.parametrize(ps);
boolean isRS = ps.execute();
if (isRS) {
try (ResultSet rs = ps.getResultSet()) {
processResultSet(sqlCommand, rs, formatter);
}
} else {
processUpdateResult(sqlCommand, ps, formatter);
}
while (ps.getMoreResults() || ps.getUpdateCount() > -1) {
ResultSet rs = ps.getResultSet();
if (rs == null) {
processUpdateResult(sqlCommand, ps, formatter);
} else {
processResultSet(sqlCommand, rs, formatter);
rs.close();
}
}
}
}
private void processUpdateResult(SQLCommand sqlCommand, PreparedStatement ps, Formatter formatter) throws SQLException {
formatter.writeStartUpdatesResult();
formatter.writeQuery(sqlCommand.getQuery());
formatter.writeParameters(sqlCommand.getParameters());
formatter.writeUpdatedRowsCount(ps.getUpdateCount());
formatter.writeEndUpdatesResult();
}
private void processResultSet(SQLCommand sqlCommand, ResultSet rs, Formatter formatter) throws SQLException {
formatter.writeStartResultSet();
formatter.writeQuery(sqlCommand.getQuery());
formatter.writeParameters(sqlCommand.getParameters());
processResultSetRows(rs, formatter);
formatter.writeEndResultSet();
}
private void processResultSetRows(ResultSet rs, Formatter formatter) throws SQLException {
formatter.writeColumnsHeader(new ColumnsHeader(rs.getMetaData()));
int columnCount = rs.getMetaData().getColumnCount();
while (rs.next()) {
formatter.writeStartRow();
for (int i = 1; i <= columnCount; i++) {
formatter.writeColumnValue(rs.getObject(i));
}
formatter.writeEndRow();
}
}
@Override
public void close() throws SQLException {
connection.close();
}
}