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Java > Open Source Codes > org > objectstyle > cayenne > access > jdbc > UpdateAction


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
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9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
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13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
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22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
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28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
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34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
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51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */
56 package org.objectstyle.cayenne.access.jdbc;
57
58 import java.sql.Connection JavaDoc;
59 import java.sql.PreparedStatement JavaDoc;
60 import java.sql.SQLException JavaDoc;
61
62 import org.objectstyle.cayenne.CayenneRuntimeException;
63 import org.objectstyle.cayenne.access.OperationObserver;
64 import org.objectstyle.cayenne.access.QueryLogger;
65 import org.objectstyle.cayenne.access.QueryTranslator;
66 import org.objectstyle.cayenne.access.trans.DeleteTranslator;
67 import org.objectstyle.cayenne.access.trans.UpdateTranslator;
68 import org.objectstyle.cayenne.dba.DbAdapter;
69 import org.objectstyle.cayenne.map.EntityResolver;
70 import org.objectstyle.cayenne.query.DeleteQuery;
71 import org.objectstyle.cayenne.query.Query;
72 import org.objectstyle.cayenne.query.UpdateQuery;
73
74 /**
75  * @since 1.2
76  * @author Andrei Adamchik
77  */
78 public class UpdateAction extends BaseSQLAction {
79
80     protected Query query;
81
82     public UpdateAction(Query query, DbAdapter adapter, EntityResolver entityResolver) {
83         super(adapter, entityResolver);
84         this.query = query;
85     }
86
87     protected QueryTranslator createTranslator(Connection JavaDoc connection) {
88         QueryTranslator translator = checkDeprecatedQueries(query);
89
90         if (translator == null) {
91             if (query instanceof UpdateQuery) {
92                 translator = new UpdateTranslator();
93             }
94             else if (query instanceof DeleteQuery) {
95                 translator = new DeleteTranslator();
96             }
97             else {
98                 throw new CayenneRuntimeException("Can't make a translator for query "
99                         + query);
100             }
101         }
102
103         translator.setAdapter(getAdapter());
104         translator.setQuery(query);
105         translator.setEntityResolver(getEntityResolver());
106         translator.setConnection(connection);
107
108         return translator;
109     }
110
111     /**
112      * @deprecated remove once deprcated queries processed here are removed.
113      */
114     final QueryTranslator checkDeprecatedQueries(Query query) {
115         if (query instanceof org.objectstyle.cayenne.query.InsertQuery) {
116             return new org.objectstyle.cayenne.access.trans.InsertTranslator();
117         }
118
119         return null;
120     }
121
122     public void performAction(Connection JavaDoc connection, OperationObserver observer)
123             throws SQLException JavaDoc, Exception JavaDoc {
124
125         QueryTranslator translator = createTranslator(connection);
126
127         PreparedStatement JavaDoc statement = translator.createStatement(query.getLoggingLevel());
128
129         try {
130             // execute update
131 int count = statement.executeUpdate();
132             QueryLogger.logUpdateCount(query.getLoggingLevel(), count);
133
134             // send results back to consumer
135 observer.nextCount(query, count);
136         }
137         finally {
138             statement.close();
139         }
140     }
141 }
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