package org.apache.turbine.util.db;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
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*
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* distribution.
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* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Turbine" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
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* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.math.BigDecimal;
import java.sql.Connection;
import org.apache.turbine.util.db.adapter.DB;
import com.workingdogs.village.DataSet;
import com.workingdogs.village.QueryDataSet;
import com.workingdogs.village.Record;
import com.workingdogs.village.Value;
/**
* This generator works with databases that have an sql syntax that
* allows the retrieval of the last id used to insert a row for a
* Connection.
*
* @author <a href="mailto:jmcnally@collab.net">John D. McNally</a>
* @version $Id$
*/
public class AutoIncrementIdGenerator
implements IdGenerator
{
private DB dbAdapter;
/**
* Creates an IdGenerator which will work with the specified database.
*
* @param dbAdapter, the adapter that knows the correct sql syntax.
*/
public AutoIncrementIdGenerator(DB adapter)
{
dbAdapter = adapter;
}
/**
* Returns the last ID used by this connection.
*
* @param connection A Connection.
* @param keyInfo, an Object that contains additional info.
* @return An int with the value for the id.
* @exception Exception Database error.
*/
public int getIdAsInt(Connection connection, Object keyInfo)
throws Exception
{
return getIdAsVillageValue(connection, keyInfo).asInt();
}
/**
* Returns the last ID used by this connection.
*
* @param connection A Connection.
* @param keyInfo, an Object that contains additional info.
* @return A long with the value for the id.
* @exception Exception Database error.
*/
public long getIdAsLong(Connection connection, Object keyInfo)
throws Exception
{
return getIdAsVillageValue(connection, keyInfo).asLong();
}
/**
* Returns the last ID used by this connection.
*
* @param connection A Connection.
* @param keyInfo, an Object that contains additional info.
* @return A BigDecimal with the last value auto-incremented as a
* result of an insert.
* @exception Exception Database error.
*/
public BigDecimal getIdAsBigDecimal(Connection connection, Object keyInfo)
throws Exception
{
return getIdAsVillageValue(connection, keyInfo).asBigDecimal();
}
/**
* Returns the last ID used by this connection.
*
* @param connection A Connection.
* @param keyInfo, an Object that contains additional info.
* @return A String with the last value auto-incremented as a
* result of an insert.
* @exception Exception Database error.
*/
public String getIdAsString(Connection connection, Object keyInfo)
throws Exception
{
return getIdAsVillageValue(connection, keyInfo).asString();
}
/**
* A flag to determine the timing of the id generation
*
* @return a <code>boolean</code> value
*/
public boolean isPriorToInsert()
{
return false;
}
/**
* A flag to determine the timing of the id generation
*
* @return a <code>boolean</code> value
*/
public boolean isPostInsert()
{
return true;
}
/**
* A flag to determine whether a Connection is required to
* generate an id.
*
* @return a <code>boolean</code> value
*/
public boolean isConnectionRequired()
{
return true;
}
/**
* Returns the last ID used by this connection.
*
* @param connection A Connection.
* @param keyInfo, an Object that contains additional info.
* @return A Village Value with the last value auto-incremented as a
* result of an insert.
* @exception Exception Database error.
*/
private Value getIdAsVillageValue(Connection connection,
Object keyInfo)
throws Exception
{
String IDSql = dbAdapter.getIdSqlForAutoIncrement(keyInfo);
Value id = null;
QueryDataSet qds = null;
try
{
qds = new QueryDataSet(connection, IDSql);
qds.fetchRecords(1);
Record rec = qds.getRecord(0);
id = rec.getValue(1);
}
finally
{
if (qds != null) qds.close();
}
return id;
}
}