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Java > Open Source Codes > org > apache > torque > adapter > DBHypersonicSQL


1 package org.apache.torque.adapter;
2
3 /*
4  * Licensed to the Apache Software Foundation (ASF) under one
5  * or more contributor license agreements. See the NOTICE file
6  * distributed with this work for additional information
7  * regarding copyright ownership. The ASF licenses this file
8  * to you under the Apache License, Version 2.0 (the
9  * "License"); you may not use this file except in compliance
10  * with the License. You may obtain a copy of the License at
11  *
12  * http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing,
15  * software distributed under the License is distributed on an
16  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17  * KIND, either express or implied. See the License for the
18  * specific language governing permissions and limitations
19  * under the License.
20  */
21
22 import java.sql.Connection JavaDoc;
23 import java.sql.SQLException JavaDoc;
24
25 /**
26  * This is used to connect to Hypersonic SQL databases.
27  *
28  * <a HREF="http://hsqldb.org/">http://hsqldb.org/</a>
29  *
30  * @author <a HREF="mailto:celkins@scardini.com">Christopher Elkins</a>
31  * @version $Id: DBHypersonicSQL.java 476550 2006-11-18 16:08:37Z tfischer $
32  */
33 public class DBHypersonicSQL extends AbstractDBAdapter
34 {
35     /**
36      * Serial version
37      */
38     private static final long serialVersionUID = 8392727399615702372L;
39
40     /**
41      * Constructor.
42      */
43     protected DBHypersonicSQL()
44     {
45     }
46
47     /**
48      * This method is used to ignore case.
49      *
50      * @param in The string to transform to upper case.
51      * @return The upper case string.
52      */
53     public String JavaDoc toUpperCase(String JavaDoc in)
54     {
55         String JavaDoc s = new StringBuffer JavaDoc("UPPER(").append(in).append(")").toString();
56         return s;
57     }
58
59     /**
60      * This method is used to ignore case.
61      *
62      * @param in The string whose case to ignore.
63      * @return The string in a case that can be ignored.
64      */
65     public String JavaDoc ignoreCase(String JavaDoc in)
66     {
67         return toUpperCase(in);
68     }
69
70     /**
71      * @see org.apache.torque.adapter.DB#getIDMethodType()
72      */
73     public String JavaDoc getIDMethodType()
74     {
75         return AUTO_INCREMENT;
76     }
77
78     /**
79      * @see org.apache.torque.adapter.DB#ignoreCaseInOrderBy(String)
80      */
81     public String JavaDoc ignoreCaseInOrderBy(String JavaDoc in)
82     {
83         return "CAST(" + in + " AS VARCHAR_IGNORECASE)";
84     }
85
86     /**
87      * @see org.apache.torque.adapter.DB#getIDMethodSQL(Object obj)
88      */
89     public String JavaDoc getIDMethodSQL(Object JavaDoc obj)
90     {
91         StringBuffer JavaDoc command = new StringBuffer JavaDoc("select IDENTITY() from ");
92         String JavaDoc qualifiedIdentifier = (String JavaDoc) obj;
93         command.append(qualifiedIdentifier);
94         return command.toString();
95     }
96
97     /**
98      * Locks the specified table.
99      *
100      * @param con The JDBC connection to use.
101      * @param table The name of the table to lock.
102      * @exception SQLException No Statement could be created or executed.
103      */
104     public void lockTable(Connection JavaDoc con, String JavaDoc table) throws SQLException JavaDoc
105     {
106     }
107
108     /**
109      * Unlocks the specified table.
110      *
111      * @param con The JDBC connection to use.
112      * @param table The name of the table to unlock.
113      * @exception SQLException No Statement could be created or executed.
114      */
115     public void unlockTable(Connection JavaDoc con, String JavaDoc table) throws SQLException JavaDoc
116     {
117     }
118
119     /**
120      * This method is for the SqlExpression.quoteAndEscape rules. The rule is,
121      * any string in a SqlExpression with a BACKSLASH will either be changed to
122      * "\\" or left as "\".
123      *
124      * @return false.
125      */
126     public boolean escapeText()
127     {
128         return false;
129     }
130
131     /**
132      * Whether an escape clause in like should be used.
133      * Example : select * from AUTHOR where AUTHOR.NAME like '\_%' ESCAPE '\';
134      *
135      * HSQLDB needs this, so this implementation always returns
136      * <code>true</code>.
137      *
138      * @return whether the escape clause should be appended or not.
139      */
140     public boolean useEscapeClauseForLike()
141     {
142         return true;
143     }
144 }
145
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