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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;
23  import java.sql.SQLException;
24  import java.sql.Statement;
25  
26  /***
27   * This code should be used for an Informix database pool.
28   *
29   * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
30   * @author <a href="mailto:bpm@ec-group.com">Brian P Millett</a>
31   * @version $Id: DBInformix.java 473821 2006-11-11 22:37:25Z tv $
32   */
33  public class DBInformix extends AbstractDBAdapter
34  {
35      /***
36       * Serial version
37       */
38      private static final long serialVersionUID = 2599963509284952957L;
39  
40      /***
41       * Empty constructor.
42       */
43      protected DBInformix()
44      {
45      }
46  
47      /***
48       * This method is used to ignore case.  Problem is that Informix
49       * does not have an UPPER function.  So the best would be to do
50       * nothing.
51       *
52       * @param in The string to transform to upper case.
53       * @return The upper case string.
54       */
55      public String toUpperCase(String in)
56      {
57          return in;
58      }
59  
60      /***
61       * This method is used to ignore case.  Problem is that Informix
62       * does not have an UPPER function.  So the best would be to do
63       * nothing.
64       *
65       * @param in The string whose case to ignore.
66       * @return The string in a case that can be ignored.
67       */
68      public String ignoreCase(String in)
69      {
70          return in;
71      }
72  
73      /***
74       * @see org.apache.torque.adapter.DB#getIDMethodType()
75       */
76      public String getIDMethodType()
77      {
78          return NO_ID_METHOD;
79      }
80  
81      /***
82       * @see org.apache.torque.adapter.DB#getIDMethodSQL(Object obj)
83       */
84      public String getIDMethodSQL(Object obj)
85      {
86          return null;
87      }
88  
89      /***
90       * The method is used to lock a table.
91       *
92       * @param con The JDBC connection to use.
93       * @param table The name of the table to lock.
94       * @exception SQLException No Statement could be created or executed.
95       */
96      public void lockTable(Connection con, String table) throws SQLException
97      {
98          Statement statement = con.createStatement();
99  
100         StringBuffer stmt = new StringBuffer();
101         stmt.append("LOCK TABLE ")
102         .append(table)
103         .append(" IN EXCLUSIVE MODE");
104 
105         statement.executeQuery(stmt.toString());
106     }
107 
108     /***
109      * The method is used to unlock a 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 con, String table) throws SQLException
116     {
117         // Tables in Informix are unlocked when a commit is issued.
118         // The user may have issued a commit but do it here to be
119         // sure.
120         con.commit();
121     }
122 }