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org.apache.torque.adapter.DBDB2App |
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1 | package org.apache.torque.adapter; |
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2 | ||
3 | /* |
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4 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, |
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15 | * software distributed under the License is distributed on an |
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16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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17 | * KIND, either express or implied. See the License for the |
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18 | * specific language governing permissions and limitations |
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19 | * under the License. |
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20 | */ |
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21 | ||
22 | import java.sql.Connection; |
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23 | import java.sql.SQLException; |
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24 | ||
25 | import org.apache.torque.util.Query; |
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26 | ||
27 | /** |
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28 | * This is used to connect via the Application-Driver to DB2 |
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29 | * databases. |
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30 | * |
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31 | * <a href="http://www-306.ibm.com/software/data/db2/">http://www-306.ibm.com/software/data/db2/</a> |
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32 | * |
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33 | * @author <a href="mailto:hakan42@gmx.de">Hakan Tandogan</a> |
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34 | * @author <a href="mailto:vido@ldh.org">Augustin Vidovic</a> |
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35 | * @version $Id: DBDB2App.java 473821 2006-11-11 22:37:25Z tv $ |
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36 | */ |
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37 | public class DBDB2App extends AbstractDBAdapter |
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38 | { |
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39 | /** |
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40 | * Serial version |
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41 | */ |
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42 | private static final long serialVersionUID = -3097347241360840675L; |
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43 | ||
44 | /** |
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45 | * Empty constructor. |
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46 | */ |
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47 | protected DBDB2App() |
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48 | 0 | { |
49 | 0 | } |
50 | ||
51 | /** |
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52 | * This method is used to ignore case. |
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53 | * |
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54 | * @param in The string to transform to upper case. |
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55 | * @return The upper case string. |
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56 | */ |
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57 | public String toUpperCase(String in) |
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58 | { |
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59 | 0 | String s = new StringBuffer("UPPER(").append(in).append(")").toString(); |
60 | 0 | return s; |
61 | } |
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62 | ||
63 | /** |
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64 | * This method is used to ignore case. |
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65 | * |
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66 | * @param in The string whose case to ignore. |
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67 | * @return The string in a case that can be ignored. |
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68 | */ |
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69 | public String ignoreCase(String in) |
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70 | { |
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71 | 0 | String s = new StringBuffer("UPPER(").append(in).append(")").toString(); |
72 | 0 | return s; |
73 | } |
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74 | ||
75 | /** |
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76 | * @see org.apache.torque.adapter.DB#getIDMethodType() |
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77 | */ |
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78 | public String getIDMethodType() |
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79 | { |
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80 | 0 | return NO_ID_METHOD; |
81 | } |
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82 | ||
83 | /** |
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84 | * @see org.apache.torque.adapter.DB#getIDMethodSQL(Object obj) |
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85 | */ |
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86 | public String getIDMethodSQL(Object obj) |
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87 | { |
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88 | 0 | return null; |
89 | } |
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90 | ||
91 | /** |
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92 | * Locks the specified table. |
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93 | * |
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94 | * @param con The JDBC connection to use. |
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95 | * @param table The name of the table to lock. |
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96 | * @exception SQLException No Statement could be created or executed. |
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97 | */ |
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98 | public void lockTable(Connection con, String table) throws SQLException |
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99 | { |
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100 | 0 | } |
101 | ||
102 | /** |
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103 | * Unlocks the specified table. |
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104 | * |
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105 | * @param con The JDBC connection to use. |
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106 | * @param table The name of the table to unlock. |
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107 | * @exception SQLException No Statement could be created or executed. |
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108 | */ |
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109 | public void unlockTable(Connection con, String table) throws SQLException |
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110 | { |
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111 | 0 | } |
112 | ||
113 | /** |
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114 | * This method is used to check whether the database supports |
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115 | * limiting the size of the resultset. |
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116 | * |
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117 | * @return LIMIT_STYLE_DB2. |
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118 | * @deprecated This should not be exposed to the outside |
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119 | */ |
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120 | public int getLimitStyle() |
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121 | { |
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122 | 0 | return DB.LIMIT_STYLE_DB2; |
123 | } |
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124 | ||
125 | /** |
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126 | * Return true for DB2 |
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127 | * @see org.apache.torque.adapter.AbstractDBAdapter#supportsNativeLimit() |
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128 | */ |
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129 | public boolean supportsNativeLimit() |
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130 | { |
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131 | 0 | return true; |
132 | } |
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133 | ||
134 | /** |
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135 | * Return true for DB2 |
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136 | * @see org.apache.torque.adapter.AbstractDBAdapter#supportsNativeOffset() |
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137 | */ |
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138 | public boolean supportsNativeOffset() |
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139 | { |
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140 | 0 | return true; |
141 | } |
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142 | ||
143 | /** |
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144 | * Build DB2 (OLAP) -style query with limit or offset. |
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145 | * If the original SQL is in variable: query then the requlting |
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146 | * SQL looks like this: |
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147 | * <pre> |
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148 | * SELECT B.* FROM ( |
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149 | * SELECT A.*, row_number() over() as TORQUE$ROWNUM FROM ( |
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150 | * query |
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151 | * ) A |
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152 | * ) B WHERE B.TORQUE$ROWNUM > offset AND B.TORQUE$ROWNUM |
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153 | * <= offset + limit |
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154 | * </pre> |
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155 | * |
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156 | * @param query The query to modify |
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157 | * @param offset the offset Value |
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158 | * @param limit the limit Value |
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159 | */ |
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160 | public void generateLimits(Query query, int offset, class="keyword">int limit) |
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161 | { |
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162 | 0 | StringBuffer preLimit = new StringBuffer() |
163 | .append("SELECT B.* FROM ( ") |
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164 | .append("SELECT A.*, row_number() over() AS TORQUE$ROWNUM FROM ( "); |
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165 | ||
166 | 0 | StringBuffer postLimit = new StringBuffer() |
167 | .append(" ) A ") |
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168 | .append(" ) B WHERE "); |
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169 | ||
170 | 0 | if (offset > 0) |
171 | { |
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172 | 0 | postLimit.append(" B.TORQUE$ROWNUM > ") |
173 | .append(offset); |
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174 | ||
175 | 0 | if (limit >= 0) |
176 | { |
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177 | 0 | postLimit.append(" AND B.TORQUE$ROWNUM <= ") |
178 | .append(offset + limit); |
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179 | 0 | } |
180 | } |
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181 | else |
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182 | { |
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183 | 0 | postLimit.append(" B.TORQUE$ROWNUM <= ") |
184 | .append(limit); |
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185 | } |
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186 | ||
187 | 0 | query.setPreLimit(preLimit.toString()); |
188 | 0 | query.setPostLimit(postLimit.toString()); |
189 | 0 | query.setLimit(null); |
190 | 0 | } |
191 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |