/**
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided
* that the following conditions are met:
*
* 1. Redistributions of source code must retain copyright
* statements and notices. Redistributions must also contain a
* copy of this document.
*
* 2. Redistributions in binary form must reproduce the
* above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. The name "Exolab" must not be used to endorse or promote
* products derived from this Software without prior written
* permission of Intalio, Inc. For written permission,
* please contact info@exolab.org.
*
* 4. Products derived from this Software may not be called "Exolab"
* nor may "Exolab" appear in their names without prior written
* permission of Intalio, Inc. Exolab is a registered
* trademark of Intalio, Inc.
*
* 5. Due credit should be given to the Exolab Project
* (http://www.exolab.org/).
*
* THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
*
* $Id$
*/
package org.castor.cpa.persistence.sql.driver;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.castor.core.util.Messages;
import org.castor.jdo.engine.SQLTypeInfos;
import org.castor.persist.ProposedEntity;
import org.exolab.castor.jdo.PersistenceException;
import org.exolab.castor.jdo.engine.JDBCSyntax;
import org.exolab.castor.mapping.AccessMode;
import org.exolab.castor.persist.spi.Identity;
import org.exolab.castor.persist.spi.PersistenceQuery;
/**
* PersistenceQuery implementation for use with PostgreSQL stored functions
* returning instance, which can be fetched only through SELECT of
* fields of the instance.
*
* @author <a href="ros@domainforfree.com">Rostislav Beloff</a>
* @author <a href="on@ibis.odessa.ua">Oleg Nitz</a>
* @version $Revision$ $Date: 2006-04-11 15:26:07 -0600 (Tue, 11 Apr 2006) $
*/
final class PostgreSQLCallQuery implements PersistenceQuery {
/** The <a href="http://jakarta.apache.org/commons/logging/">Jakarta
* Commons Logging</a> instance used for all logging. */
private static Log _log = LogFactory.getFactory().getInstance(PostgreSQLCallQuery.class);
private PreparedStatement _stmt;
private ResultSet _rs;
private final Class<?> _javaClass;
private final Class<?>[] _types;
private final Object[] _values;
private final String _call;
private Identity _lastIdentity;
private int[] _sqlTypes;
PostgreSQLCallQuery(final String call, final Class<?>[] types, final Class<?> javaClass,
final String[] fields, final int[] sqlTypes) {
StringBuffer query = new StringBuffer();
query.append(JDBCSyntax.SELECT);
for (int i = 0; i < fields.length; i++) {
if (i > 0) {
query.append(JDBCSyntax.COLUMN_SEPARATOR);
}
query.append(fields[i]);
query.append("(");
query.append(call);
query.append(")");
}
_call = query.toString();
_types = types;
_javaClass = javaClass;
_sqlTypes = sqlTypes;
_values = new Object[ _types.length ];
}
public boolean absolute(final int row) throws PersistenceException {
return false;
}
public int size() throws PersistenceException {
return 0;
}
public int getParameterCount() {
return _types.length;
}
public Class<?> getParameterType(final int index) throws ArrayIndexOutOfBoundsException {
return _types[ index ];
}
public void setParameter(final int index, final Object value)
throws ArrayIndexOutOfBoundsException, IllegalArgumentException {
_values[ index ] = value;
}
public Class<?> getResultType() {
return _javaClass;
}
public void execute(final Object conn, final AccessMode accessMode, final boolean scrollable)
throws PersistenceException {
execute(conn, accessMode);
}
private void execute(final Object conn, final AccessMode accessMode)
throws PersistenceException {
_lastIdentity = null;
try {
int count;
_stmt = ((Connection) conn).prepareStatement(_call);
count = 1;
for (int f = 0; f < _sqlTypes.length; ++f) {
for (int i = 0; i < _values.length; ++i) {
_stmt.setObject(count, _values[i]);
++count;
}
}
for (int i = 0; i < _values.length; ++i) {
_values[ i ] = null;
}
_stmt.execute();
_rs = _stmt.executeQuery();
} catch (SQLException except) {
if (_stmt != null) {
try {
_stmt.close();
} catch (SQLException e2) {
_log.warn (Messages.message ("persist.stClosingFailed"), e2);
}
}
throw new PersistenceException(Messages.format("persist.nested", except));
}
}
public Identity nextIdentity(final Identity identity) throws PersistenceException {
try {
if (_lastIdentity == null) {
if (!_rs.next()) { return null; }
_lastIdentity = new Identity(SQLTypeInfos.getValue(_rs, 1, _sqlTypes[0]));
return _lastIdentity;
}
while (_lastIdentity.equals(identity)) {
if (!_rs.next()) {
_lastIdentity = null;
return null;
}
_lastIdentity = new Identity(SQLTypeInfos.getValue(_rs, 1, _sqlTypes[0]));
}
return _lastIdentity;
} catch (SQLException except) {
_lastIdentity = null;
throw new PersistenceException(Messages.format("persist.nested", except));
}
}
public void close() {
if (_rs != null) {
try {
_rs.close();
} catch (SQLException except) {
_log.warn (Messages.message ("persist.rsClosingFailed"), except);
}
_rs = null;
}
if (_stmt != null) {
try {
_stmt.close();
} catch (SQLException except) {
_log.warn (Messages.message ("persist.stClosingFailed"), except);
}
_stmt = null;
}
}
public void fetch(final ProposedEntity proposedObject) throws PersistenceException {
try {
// Load all the fields of the object including one-one relations
// index 0 belongs to the identity
for (int i = 1; i < _sqlTypes.length; ++i) {
proposedObject.setField(SQLTypeInfos.getValue(_rs, i + 1, _sqlTypes[i]), i - 1);
}
if (_rs.next()) {
_lastIdentity = new Identity(SQLTypeInfos.getValue(_rs, 1, _sqlTypes[0]));
} else {
_lastIdentity = null;
}
} catch (SQLException except) {
throw new PersistenceException(Messages.format("persist.nested",
except));
}
}
}