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Java > Open Source Codes > org > jboss > ejb > plugins > cmp > jdbc > keygen > JDBCPostgreSQLCreateCommand


1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.ejb.plugins.cmp.jdbc.keygen;
23
24 import java.sql.Connection JavaDoc;
25 import java.sql.PreparedStatement JavaDoc;
26 import java.sql.ResultSet JavaDoc;
27 import java.sql.SQLException JavaDoc;
28 import java.sql.Statement JavaDoc;
29 import javax.ejb.EJBException JavaDoc;
30
31 import org.jboss.deployment.DeploymentException;
32 import org.jboss.ejb.EntityEnterpriseContext;
33 import org.jboss.ejb.plugins.cmp.jdbc.JDBCIdentityColumnCreateCommand;
34 import org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager;
35 import org.jboss.ejb.plugins.cmp.jdbc.JDBCUtil;
36 import org.jboss.ejb.plugins.cmp.jdbc.SQLUtil;
37 import org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCEntityCommandMetaData;
38
39 /**
40  * Create command for PostgreSQL that fetches the currval of the sequence
41  * associated with a SERIAL column in this table.
42  *
43  * @author <a HREF="mailto:jeremy@boynes.com">Jeremy Boynes</a>
44  * @version $Revision: 37459 $
45  */
46 public class JDBCPostgreSQLCreateCommand extends JDBCIdentityColumnCreateCommand
47 {
48    private String JavaDoc sequence;
49    private String JavaDoc sequenceSQL;
50
51    public void init(JDBCStoreManager manager) throws DeploymentException
52    {
53       super.init(manager);
54    }
55
56    protected void initEntityCommand(JDBCEntityCommandMetaData entityCommand) throws DeploymentException
57    {
58       super.initEntityCommand(entityCommand);
59       sequence = entityCommand.getAttribute("sequence");
60       if (sequence == null) {
61          sequence = entity.getQualifiedTableName()
62             + '_' + SQLUtil.getColumnNamesClause(pkField, new StringBuffer JavaDoc(20))
63             + "_seq";
64       }
65       sequenceSQL = "SELECT currval('"+sequence+"')";
66       if (debug) {
67          log.debug("SEQUENCE SQL is :"+sequenceSQL);
68       }
69    }
70
71    protected int executeInsert(int index, PreparedStatement JavaDoc ps, EntityEnterpriseContext ctx) throws SQLException JavaDoc
72    {
73       int rows = ps.executeUpdate();
74
75       Statement JavaDoc s = null;
76       ResultSet JavaDoc rs = null;
77       try {
78          if (trace) {
79             log.trace("Executing SQL :"+sequenceSQL);
80          }
81          Connection JavaDoc c = ps.getConnection();
82          s = c.createStatement();
83          rs = s.executeQuery(sequenceSQL);
84          if (!rs.next()) {
85             throw new EJBException JavaDoc("sequence sql returned an empty ResultSet");
86          }
87          pkField.loadInstanceResults(rs, 1, ctx);
88       } catch (RuntimeException JavaDoc e) {
89          throw e;
90       } catch (Exception JavaDoc e) {
91          // throw EJBException to force a rollback as the row has been inserted
92 throw new EJBException JavaDoc("Error extracting generated keys", e);
93       } finally {
94          JDBCUtil.safeClose(rs);
95          JDBCUtil.safeClose(s);
96       }
97
98       return rows;
99    }
100 }
101
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