/*
* Copyright (C) 2003-2011 eXo Platform SAS.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Affero 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 org.exoplatform.services.jcr.impl.storage.jdbc.optimisation.db;
import org.exoplatform.services.jcr.impl.storage.jdbc.JDBCDataContainerConfig;
import org.exoplatform.services.jcr.impl.storage.jdbc.optimisation.db.SybaseJDBCConnectionHelper.EmptyResultSet;
import org.exoplatform.services.jcr.util.IdGenerator;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/**
* Created by The eXo Platform SAS.
*
* <br/>Date:
*
* @author <a href="karpenko.sergiy@gmail.com">Karpenko Sergiy</a>
* @version $Id: SybaseMultiDbJDBCConnection.java 111 4.05.2011 serg $
*/
public class SybaseMultiDbJDBCConnection extends MultiDbJDBCConnection
{
/**
* SELECT_LIMIT_OFFSET_NODES_INTO_TEMPORARY_TABLE
*/
protected String SELECT_LIMIT_OFFSET_NODES_INTO_TEMPORARY_TABLE;
/**
* COUNT_NODES_IN_TEMPORARY_TABLE
*/
protected String COUNT_NODES_IN_TEMPORARY_TABLE;
/**
* SELECT_LIMIT_NODES_FROM_TEMPORARY_TABLE
*/
protected String SELECT_LIMIT_NODES_FROM_TEMPORARY_TABLE;
/**
* DELETE_TEMPORARY_TABLE_A
*/
protected String DELETE_TEMPORARY_TABLE_A;
/**
* DELETE_TEMPORARY_TABLE_B
*/
protected String DELETE_TEMPORARY_TABLE_B;
protected PreparedStatement selectLimitOffsetNodesIntoTemporaryTable;
protected PreparedStatement selectLimitNodesInTemporaryTable;
protected PreparedStatement deleteTemporaryTableA;
protected PreparedStatement deleteTemporaryTableB;
protected PreparedStatement countNodesInTemporaryTable;
/**
* @param dbConnection
* JDBC connection, should be opened before
* @param readOnly
* boolean if true the dbConnection was marked as READ-ONLY.
* @param containerConfig
* Workspace Storage Container configuration
*/
public SybaseMultiDbJDBCConnection(Connection dbConnection, boolean readOnly, JDBCDataContainerConfig containerConfig)
throws SQLException
{
super(dbConnection, readOnly, containerConfig);
}
/**
* {@inheritDoc}
*/
@Override
protected String escapeSpecialChars(String pattern)
{
char[] chars = pattern.toCharArray();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < chars.length; i++)
{
switch (chars[i])
{
case '*' :
sb.append('%');
break;
case '_' :
case '%' :
case '[' : //Sybase pattern special symbol
case ']' : //Sybase pattern special symbol
sb.append(this.getWildcardEscapeSymbol());
default :
sb.append(chars[i]);
}
}
return sb.toString();
}
/**
* {@inheritDoc}
*/
protected void prepareQueries() throws SQLException
{
super.prepareQueries();
SELECT_LIMIT_OFFSET_NODES_INTO_TEMPORARY_TABLE =
"select I.ID, I.PARENT_ID, I.NAME, I.VERSION, I.I_INDEX, I.N_ORDER_NUM into "
+ SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME + " from " + JCR_ITEM
+ " I (index "+JCR_PK_ITEM+") where I.I_CLASS=1 AND I.ID > ? order by I.ID ASC";
COUNT_NODES_IN_TEMPORARY_TABLE = "select count(*) from " + SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME;
SELECT_LIMIT_NODES_FROM_TEMPORARY_TABLE =
"select * into " + SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME + " from "
+ SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME + " order by "
+ SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME + ".ID DESC";
FIND_NODES_AND_PROPERTIES =
"select " + SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME
+ ".*, P.ID AS P_ID, P.NAME AS P_NAME, P.VERSION AS P_VERSION, P.P_TYPE, P.P_MULTIVALUED,"
+ " V.DATA, V.ORDER_NUM, V.STORAGE_DESC from " + JCR_VALUE + " V, " + JCR_ITEM + " P, "
+ SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME + " where P.PARENT_ID = "
+ SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME + ".ID and P.I_CLASS=2 and V.PROPERTY_ID=P.ID "
+ "order by " + SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME + ".ID";
DELETE_TEMPORARY_TABLE_A = "drop table " + SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME;
DELETE_TEMPORARY_TABLE_B = "drop table " + SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME;
}
/**
* {@inheritDoc}
*/
protected ResultSet findNodesAndProperties(String lastNodeId, int offset, int limit) throws SQLException
{
String tempTableAName = "tempdb..a" + IdGenerator.generate();
String tempTableBName = "tempdb..b" + IdGenerator.generate();
boolean tempTableACreated = false;
boolean tempTableBCreated = false;
try
{
// the Sybase is not allowed DDL query (CREATE TABLE, DROP TABLE, etc. ) within a multi-statement transaction
if (!dbConnection.getAutoCommit())
{
dbConnection.setAutoCommit(true);
}
selectLimitOffsetNodesIntoTemporaryTable =
dbConnection.prepareStatement(SELECT_LIMIT_OFFSET_NODES_INTO_TEMPORARY_TABLE.replaceAll(
SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME, tempTableAName));
countNodesInTemporaryTable =
dbConnection.prepareStatement(COUNT_NODES_IN_TEMPORARY_TABLE.replaceAll(
SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME, tempTableAName));
selectLimitNodesInTemporaryTable =
dbConnection.prepareStatement(SELECT_LIMIT_NODES_FROM_TEMPORARY_TABLE.replaceAll(
SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME, tempTableAName).replaceAll(
SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME, tempTableBName));
if (findNodesAndProperties != null)
{
findNodesAndProperties.close();
}
findNodesAndProperties =
dbConnection.prepareStatement(FIND_NODES_AND_PROPERTIES.replaceAll(
SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME, tempTableBName));
deleteTemporaryTableA =
dbConnection.prepareStatement(DELETE_TEMPORARY_TABLE_A.replaceAll(
SybaseJDBCConnectionHelper.TEMP_A_TABLE_NAME, tempTableAName));
deleteTemporaryTableB =
dbConnection.prepareStatement(DELETE_TEMPORARY_TABLE_B.replaceAll(
SybaseJDBCConnectionHelper.TEMP_B_TABLE_NAME, tempTableBName));
selectLimitOffsetNodesIntoTemporaryTable.setMaxRows(limit + offset);
selectLimitOffsetNodesIntoTemporaryTable.setString(1, lastNodeId);
selectLimitOffsetNodesIntoTemporaryTable.execute();
tempTableACreated = true;
ResultSet nodesCountInTemporaryTable = countNodesInTemporaryTable.executeQuery();
if (!nodesCountInTemporaryTable.next())
{
throw new SQLException("Can not count nodes in temporary table.");
}
int count = nodesCountInTemporaryTable.getInt(1);
// define newLimit if number of records in temporary table #tempA is equal offset + limit
int newLimit = limit;
if (offset > count)
{
// return empty ResultSet because there are no enough nodes to return
return new EmptyResultSet();
}
else if (offset + limit > count)
{
// it is possible to select only count-offset nodes from temporary table #tempA
newLimit = count - offset;
}
selectLimitNodesInTemporaryTable.setMaxRows(newLimit);
selectLimitNodesInTemporaryTable.execute();
tempTableBCreated = true;
return findNodesAndProperties.executeQuery();
}
finally
{
if (tempTableACreated)
{
try
{
deleteTemporaryTableA.execute();
}
catch (SQLException e)
{
LOG.warn("Can not delete temporary table " + tempTableAName);
}
}
if (tempTableBCreated)
{
try
{
deleteTemporaryTableB.execute();
}
catch (SQLException e)
{
LOG.warn("Can not delete temporary table " + tempTableBName);
}
}
// close prepared statement since we always create new
if (selectLimitOffsetNodesIntoTemporaryTable != null)
{
selectLimitOffsetNodesIntoTemporaryTable.close();
}
if (selectLimitNodesInTemporaryTable != null)
{
selectLimitNodesInTemporaryTable.close();
}
if (deleteTemporaryTableA != null)
{
deleteTemporaryTableA.close();
}
if (deleteTemporaryTableB != null)
{
deleteTemporaryTableB.close();
}
if (countNodesInTemporaryTable != null)
{
countNodesInTemporaryTable.close();
}
}
}
}