/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/kernel/trunk/kernel-util/src/main/java/org/sakaiproject/util/DoubleStorageSqlMySql.java $
* $Id: DoubleStorageSqlMySql.java 101656 2011-12-12 22:40:28Z aaronz@vt.edu $
***********************************************************************************
*
* 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.util;
/**
* methods for accessing double storage data in a mysql database.
*/
public class DoubleStorageSqlMySql extends DoubleStorageSqlDefault
{
/**
* Return a record ID to use internally in the database. This is needed for databases (MySQL) that have limits on key lengths. The hash code
* ensures that the record ID will be unique, even if the DB only considers a prefix of a very long record ID.
*
* @param recordId
* @return The record ID to use internally in the database
*/
public String getRecordId(String recordId)
{
if (recordId == null) recordId = "null";
return recordId.hashCode() + " - " + recordId;
}
// MySql supports the limit operation at the end of the Query so this is pretty easy
@Override
public String addLimitToQuery(String sqlIn, int startRec, int endRec)
{
int recordCount = (endRec-startRec)+1;
return sqlIn + " limit "+startRec+","+recordCount;
}
}