/*
    * Copyright 2005-2007 The Kuali Foundation
    * 
    * $Source: /opt/cvs/rice/shared/src/main/java/org/apache/ojb/broker/platforms/KualiMySQLSequenceManagerImpl.java,v $
    * 
    * 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/ecl2.php
   * 
   * 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.apache.ojb.broker.platforms;
  
  import java.sql.Connection;
  import java.sql.ResultSet;
  import java.sql.Statement;
  
  import org.apache.ojb.broker.PersistenceBroker;
  import org.apache.ojb.broker.metadata.FieldDescriptor;
  import org.apache.ojb.broker.util.sequence.AbstractSequenceManager;
  import org.apache.ojb.broker.util.sequence.SequenceManagerException;
  
  public class KualiMySQLSequenceManagerImpl extends AbstractSequenceManager {
  
  	public KualiMySQLSequenceManagerImpl(PersistenceBroker broker) {
  		super(broker);
  	}
  
  	@Override
  	protected long getUniqueLong(FieldDescriptor arg0)
  			throws SequenceManagerException {
  		PersistenceBroker broker = getBrokerForClass();
  
  		Statement stmt = null;
  		Long seqNumber = null;
  		final String sequenceName = arg0.getSequenceName();
  
  		try {
  			//FIXME: should we be closing this connection in a finally block?
  			Connection c = broker.serviceConnectionManager().getConnection();
  			stmt = c.createStatement();
  			String sql = "INSERT INTO " + sequenceName + " VALUES (NULL);";
  			stmt.executeUpdate(sql);
  			sql = "SELECT LAST_INSERT_ID()";
  			
  			//FIXME: should we be closing this result set in a finally block?
  			ResultSet rs = stmt.executeQuery(sql);
  			if (rs != null) {
  				rs.first();
  				seqNumber = rs.getLong(1);
  			}
  		} catch (Exception e) {
  			throw new RuntimeException("Unable to execute for sequence name: " + sequenceName, e);
  		} finally {
  			try {
  				if (stmt != null) {
  					stmt.close();
  				}
  			} catch (Exception e) {
  				throw new RuntimeException("Unable to close statement for sequence name: " + sequenceName, e);
  			}
  		}
  
  		return seqNumber;
  	}
  
  }