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Java > Open Source Codes > com > sun > jdo > spi > persistence > support > sqlstore > sql > generator > SelectOneStatement


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23
24 package com.sun.jdo.spi.persistence.support.sqlstore.sql.generator;
25
26 import com.sun.jdo.spi.persistence.support.sqlstore.database.DBVendorType;
27
28 /**
29  * This statement checks the existance of a certain row in the
30  * database, as no columns are selected.
31  *
32  * @author Mitesh Meswani
33  */
34 public class SelectOneStatement extends SelectStatement {
35
36     private static final StringBuffer JavaDoc ONE = new StringBuffer JavaDoc("1"); // NOI18N
37
38     public SelectOneStatement(DBVendorType vendorType,
39             SelectQueryPlan selectPlan) {
40         super(vendorType, selectPlan);
41     }
42
43     protected StringBuffer JavaDoc generateColumnText() {
44         // No columns selected.
45 return ONE;
46     }
47
48 }
49
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