Coverage report

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org.apache.torque.adapter.DBDB2App
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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  
 
 25  
 import org.apache.torque.util.Query;
 26  
 
 27  
 /**
 28  
  * This is used to connect via the Application-Driver to DB2
 29  
  * databases.
 30  
  *
 31  
  * <a href="http://www-306.ibm.com/software/data/db2/">http://www-306.ibm.com/software/data/db2/</a>
 32  
  *
 33  
  * @author <a href="mailto:hakan42@gmx.de">Hakan Tandogan</a>
 34  
  * @author <a href="mailto:vido@ldh.org">Augustin Vidovic</a>
 35  
  * @version $Id: DBDB2App.java 473821 2006-11-11 22:37:25Z tv $
 36  
  */
 37  
 public class DBDB2App extends AbstractDBAdapter
 38  
 {
 39  
     /**
 40  
      * Serial version
 41  
      */
 42  
     private static final long serialVersionUID = -3097347241360840675L;
 43  
 
 44  
     /**
 45  
      * Empty constructor.
 46  
      */
 47  
     protected DBDB2App()
 48  0
     {
 49  0
     }
 50  
 
 51  
     /**
 52  
      * This method is used to ignore case.
 53  
      *
 54  
      * @param in The string to transform to upper case.
 55  
      * @return The upper case string.
 56  
      */
 57  
     public String toUpperCase(String in)
 58  
     {
 59  0
         String s = new StringBuffer("UPPER(").append(in).append(")").toString();
 60  0
         return s;
 61  
     }
 62  
 
 63  
     /**
 64  
      * This method is used to ignore case.
 65  
      *
 66  
      * @param in The string whose case to ignore.
 67  
      * @return The string in a case that can be ignored.
 68  
      */
 69  
     public String ignoreCase(String in)
 70  
     {
 71  0
         String s = new StringBuffer("UPPER(").append(in).append(")").toString();
 72  0
         return s;
 73  
     }
 74  
 
 75  
     /**
 76  
      * @see org.apache.torque.adapter.DB#getIDMethodType()
 77  
      */
 78  
     public String getIDMethodType()
 79  
     {
 80  0
         return NO_ID_METHOD;
 81  
     }
 82  
 
 83  
     /**
 84  
      * @see org.apache.torque.adapter.DB#getIDMethodSQL(Object obj)
 85  
      */
 86  
     public String getIDMethodSQL(Object obj)
 87  
     {
 88  0
         return null;
 89  
     }
 90  
 
 91  
     /**
 92  
      * Locks the specified table.
 93  
      *
 94  
      * @param con The JDBC connection to use.
 95  
      * @param table The name of the table to lock.
 96  
      * @exception SQLException No Statement could be created or executed.
 97  
      */
 98  
     public void lockTable(Connection con, String table) throws SQLException
 99  
     {
 100  0
     }
 101  
 
 102  
     /**
 103  
      * Unlocks the specified table.
 104  
      *
 105  
      * @param con The JDBC connection to use.
 106  
      * @param table The name of the table to unlock.
 107  
      * @exception SQLException No Statement could be created or executed.
 108  
      */
 109  
     public void unlockTable(Connection con, String table) throws SQLException
 110  
     {
 111  0
     }
 112  
 
 113  
     /**
 114  
      * This method is used to check whether the database supports
 115  
      * limiting the size of the resultset.
 116  
      *
 117  
      * @return LIMIT_STYLE_DB2.
 118  
      * @deprecated This should not be exposed to the outside
 119  
      */
 120  
     public int getLimitStyle()
 121  
     {
 122  0
         return DB.LIMIT_STYLE_DB2;
 123  
     }
 124  
 
 125  
     /**
 126  
      * Return true for DB2
 127  
      * @see org.apache.torque.adapter.AbstractDBAdapter#supportsNativeLimit()
 128  
      */
 129  
     public boolean supportsNativeLimit()
 130  
     {
 131  0
         return true;
 132  
     }
 133  
 
 134  
     /**
 135  
      * Return true for DB2
 136  
      * @see org.apache.torque.adapter.AbstractDBAdapter#supportsNativeOffset()
 137  
      */
 138  
     public boolean supportsNativeOffset()
 139  
     {
 140  0
         return true;
 141  
     }
 142  
 
 143  
     /**
 144  
      * Build DB2 (OLAP) -style query with limit or offset.
 145  
      * If the original SQL is in variable: query then the requlting
 146  
      * SQL looks like this:
 147  
      * <pre>
 148  
      * SELECT B.* FROM (
 149  
      *          SELECT A.*, row_number() over() as TORQUE$ROWNUM FROM (
 150  
      *                  query
 151  
      *          ) A
 152  
      *     ) B WHERE B.TORQUE$ROWNUM > offset AND B.TORQUE$ROWNUM
 153  
      *     <= offset + limit
 154  
      * </pre>
 155  
      *
 156  
      * @param query The query to modify
 157  
      * @param offset the offset Value
 158  
      * @param limit the limit Value
 159  
      */
 160  
     public void generateLimits(Query query, int offset, class="keyword">int limit)
 161  
     {
 162  0
         StringBuffer preLimit = new StringBuffer()
 163  
         .append("SELECT B.* FROM ( ")
 164  
         .append("SELECT A.*, row_number() over() AS TORQUE$ROWNUM FROM ( ");
 165  
 
 166  0
         StringBuffer postLimit = new StringBuffer()
 167  
                 .append(" ) A ")
 168  
                 .append(" ) B WHERE ");
 169  
 
 170  0
         if (offset > 0)
 171  
         {
 172  0
             postLimit.append(" B.TORQUE$ROWNUM > ")
 173  
                     .append(offset);
 174  
 
 175  0
             if (limit >= 0)
 176  
             {
 177  0
                 postLimit.append(" AND B.TORQUE$ROWNUM <= ")
 178  
                         .append(offset + limit);
 179  
             }
 180  
         }
 181  
         else
 182  
         {
 183  0
             postLimit.append(" B.TORQUE$ROWNUM <= ")
 184  
                     .append(limit);
 185  
         }
 186  
 
 187  0
         query.setPreLimit(preLimit.toString());
 188  0
         query.setPostLimit(postLimit.toString());
 189  0
         query.setLimit(null);
 190  0
     }
 191  
 }

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