/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/kernel/trunk/kernel-impl/src/main/java/org/sakaiproject/db/impl/BasicSqlServiceSqlHSql.java $
* $Id: BasicSqlServiceSqlHSql.java 105077 2012-02-24 22:54:29Z ottenhoff@longsight.com $
***********************************************************************************
*
* Copyright (c) 2007, 2008 Sakai Foundation
*
* Licensed under the Educational Community License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.opensource.org/licenses/ECL-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**********************************************************************************/
package org.sakaiproject.db.impl;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.util.GregorianCalendar;
/**
* methods for accessing sql service methods in a hypersonic sql database.
*/
public class BasicSqlServiceSqlHSql extends BasicSqlServiceSqlDefault
{
/**
* returns whether the sql exception indicates that a record already exists in a table.
*/
@Override
public boolean getRecordAlreadyExists(SQLException ex)
{
// From HSQLDB src/org/hsqldb/resources/sql-error-messages.properties
//009=23000 Violation of unique index $$: duplicate value(s) for column(s) $$
//104=23000 Violation of unique constraint $$: duplicate value(s) for column(s) $$
return ex.getErrorCode() == -104 || ex.getErrorCode() == -9;
}
/**
* returns the sql statement which returns the next number in a sequence. <br/><br/>
*
* @param table
* name of table to read the sequence number from.
*/
@Override
public String getNextSequenceSql(String table)
{
return "SELECT NEXT VALUE FOR " + table + " FROM DUAL";
}
/**
* sets the value of a timestamp field in the specified column. <br/><br/>
*
* @param pstmt
* prepared statement
* @param timestamp
* timestamp
* @param calendar
* calendar
* @param pos
* number of column of bytes field.
*/
@Override
public PreparedStatement setTimestamp(PreparedStatement pstmt, Timestamp timestamp, GregorianCalendar calendar, int pos) throws SQLException
{
pstmt.setTimestamp(pos, timestamp, null);
return pstmt;
}
@Override
public PreparedStatement prepareAutoColumn(Connection conn, String sql, String autoColumn) throws SQLException
{
// HSQL does not support autoColumn
return conn.prepareStatement(sql);
}
/**
* Extract the generated key since HSQL does not support getGeneratedKeys()
*
* {@inheritDoc}
*/
@Override
public Long getGeneratedKey(PreparedStatement pstmt, String sql) throws SQLException
{
String[] tokens = sql.trim().split("\\s+");
// Only handle INSERT INTO table_name - ignore everything else
if ( tokens.length >= 3 && "insert".equalsIgnoreCase(tokens[0]) && "into".equalsIgnoreCase(tokens[1]) ) {
Statement kstmt = pstmt.getConnection().createStatement();
// The use of IDENTITY() is reasonable since Sakai across the
// board only allows one autoColumn in the dbInsert() method
// If it works, we get the right thing - if it fails, it
// will alert the developer. as they are developing
ResultSet keys = kstmt.executeQuery("SELECT IDENTITY() FROM " + tokens[2]);
if (keys.next()) {
return Long.valueOf(keys.getLong(1));
}
}
return null;
}
}