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


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.
8  *
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10  * modification, are permitted provided that the following conditions
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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
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31  * "andrus at objectstyle dot org".
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34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
35  * names without prior written permission.
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43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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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.ResultSet JavaDoc;
59 import java.sql.SQLException JavaDoc;
60 import java.util.List JavaDoc;
61
62 import org.objectstyle.cayenne.CayenneException;
63 import org.objectstyle.cayenne.access.OperationObserver;
64 import org.objectstyle.cayenne.access.QueryLogger;
65 import org.objectstyle.cayenne.dba.DbAdapter;
66 import org.objectstyle.cayenne.map.EntityResolver;
67 import org.objectstyle.cayenne.query.GenericSelectQuery;
68 import org.objectstyle.cayenne.query.SQLAction;
69
70 /**
71  * A convenience superclass for SQLAction implementations.
72  *
73  * @since 1.2
74  * @author Andrei Adamchik
75  */
76 public abstract class BaseSQLAction implements SQLAction {
77
78     protected DbAdapter adapter;
79     protected EntityResolver entityResolver;
80
81     public BaseSQLAction(DbAdapter adapter, EntityResolver entityResolver) {
82         this.adapter = adapter;
83         this.entityResolver = entityResolver;
84     }
85
86     public DbAdapter getAdapter() {
87         return adapter;
88     }
89
90     public EntityResolver getEntityResolver() {
91         return entityResolver;
92     }
93
94     /**
95      * Helper method to process a ResultSet.
96      */
97     protected void readResultSet(
98             ResultSet JavaDoc resultSet,
99             RowDescriptor descriptor,
100             GenericSelectQuery query,
101             OperationObserver delegate) throws SQLException JavaDoc, Exception JavaDoc {
102
103         long t1 = System.currentTimeMillis();
104         JDBCResultIterator resultReader = new JDBCResultIterator(
105                 null,
106                 null,
107                 resultSet,
108                 descriptor,
109                 query.getFetchLimit());
110
111         if (!delegate.isIteratedResult()) {
112             List JavaDoc resultRows = resultReader.dataRows(false);
113             QueryLogger.logSelectCount(query.getLoggingLevel(), resultRows.size(), System
114                     .currentTimeMillis()
115                     - t1);
116
117             delegate.nextDataRows(query, resultRows);
118         }
119         else {
120             try {
121                 resultReader.setClosingConnection(true);
122                 delegate.nextDataRows(query, resultReader);
123             }
124             catch (Exception JavaDoc ex) {
125
126                 try {
127                     resultReader.close();
128                 }
129                 catch (CayenneException cex) {
130                     // ignore...
131 }
132                 
133                 throw ex;
134             }
135         }
136     }
137 }
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