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org.apache.torque.adapter.DBSybase |
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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 | import java.sql.Statement; |
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25 | import java.text.SimpleDateFormat; |
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26 | import java.util.Date; |
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27 | ||
28 | import org.apache.torque.TorqueException; |
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29 | import org.apache.torque.util.Criteria; |
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30 | import org.apache.torque.util.Query; |
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31 | import org.apache.torque.util.SqlExpression; |
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32 | ||
33 | /** |
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34 | * This is used to connect to a Sybase database using Sybase's |
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35 | * JConnect JDBC driver. |
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36 | * |
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37 | * <B>NOTE:</B><I>Currently JConnect does not implement the required |
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38 | * methods for ResultSetMetaData, and therefore the village API's may |
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39 | * not function. For connection pooling, everything works.</I> |
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40 | * |
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41 | * @author <a href="mailto:ekkerbj@netscape.net">Jeff Brekke</a> |
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42 | * @version $Id: DBSybase.java 586553 2007-10-19 17:33:53Z gmonroe $ |
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43 | */ |
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44 | public class DBSybase extends AbstractDBAdapter |
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45 | { |
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46 | /** |
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47 | * Serial version |
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48 | */ |
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49 | private static final long serialVersionUID = 4782996646843056810L; |
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50 | ||
51 | /** date format */ |
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52 | private static final String DATE_FORMAT = "yyyyMMdd HH:mm:ss"; |
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53 | ||
54 | /** |
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55 | * Empty constructor. |
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56 | */ |
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57 | protected DBSybase() |
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58 | 0 | { |
59 | 0 | } |
60 | ||
61 | /** |
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62 | * This method is used to ignore case. |
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63 | * |
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64 | * @param in The string to transform to upper case. |
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65 | * @return The upper case string. |
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66 | */ |
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67 | public String toUpperCase(String in) |
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68 | { |
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69 | 0 | return new StringBuffer("UPPER(").append(in).append(")").toString(); |
70 | } |
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71 | ||
72 | /** |
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73 | * This method is used to ignore case. |
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74 | * |
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75 | * @param in The string whose case to ignore. |
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76 | * @return The string in a case that can be ignored. |
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77 | */ |
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78 | public String ignoreCase(String in) |
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79 | { |
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80 | 0 | return new StringBuffer("UPPER(").append(in).append(")").toString(); |
81 | } |
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82 | ||
83 | /** |
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84 | * @see org.apache.torque.adapter.DB#getIDMethodType() |
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85 | */ |
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86 | public String getIDMethodType() |
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87 | { |
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88 | 0 | return AUTO_INCREMENT; |
89 | } |
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90 | ||
91 | /** |
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92 | * Returns the last value from an identity column (available on a |
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93 | * per-session basis from the global variable |
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94 | * <code>@@identity</code>). |
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95 | * |
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96 | * @see org.apache.torque.adapter.DB#getIDMethodSQL(Object obj) |
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97 | */ |
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98 | public String getIDMethodSQL(Object unused) |
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99 | { |
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100 | 0 | return "select @@identity"; |
101 | } |
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102 | ||
103 | /** |
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104 | * Locks the specified table. |
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105 | * |
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106 | * @param con The JDBC connection to use. |
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107 | * @param table The name of the table to lock. |
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108 | * @throws SQLException No Statement could be created or executed. |
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109 | */ |
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110 | public void lockTable(Connection con, String table) throws SQLException |
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111 | { |
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112 | 0 | Statement statement = con.createStatement(); |
113 | ||
114 | 0 | StringBuffer stmt = new StringBuffer(); |
115 | 0 | stmt.append("SELECT next_id FROM ") |
116 | .append(table) |
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117 | .append(" FOR UPDATE"); |
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118 | ||
119 | 0 | statement.executeQuery(stmt.toString()); |
120 | 0 | } |
121 | ||
122 | /** |
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123 | * Unlocks the specified table. |
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124 | * |
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125 | * @param con The JDBC connection to use. |
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126 | * @param table The name of the table to unlock. |
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127 | * @throws SQLException No Statement could be created or executed. |
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128 | */ |
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129 | public void unlockTable(Connection con, String table) throws SQLException |
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130 | { |
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131 | // Tables in Sybase are unlocked when a commit is issued. The |
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132 | // user may have issued a commit but do it here to be sure. |
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133 | 0 | con.commit(); |
134 | 0 | } |
135 | ||
136 | /** |
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137 | * This method is used to chek whether the database supports |
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138 | * limiting the size of the resultset. |
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139 | * |
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140 | * @return LIMIT_STYLE_SYBASE. |
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141 | * @deprecated This should not be exposed to the outside |
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142 | */ |
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143 | public int getLimitStyle() |
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144 | { |
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145 | 0 | return DB.LIMIT_STYLE_SYBASE; |
146 | } |
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147 | ||
148 | /** |
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149 | * Return true for Sybase |
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150 | * @see org.apache.torque.adapter.AbstractDBAdapter#supportsNativeLimit() |
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151 | */ |
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152 | public boolean supportsNativeLimit() |
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153 | { |
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154 | 0 | return true; |
155 | } |
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156 | ||
157 | /** |
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158 | * Modify a query to add limit and offset values for Sybase. |
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159 | * |
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160 | * @param query The query to modify |
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161 | * @param offset the offset Value |
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162 | * @param limit the limit Value |
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163 | * |
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164 | * @throws TorqueException if any error occurs when building the query |
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165 | */ |
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166 | public void generateLimits(Query query, int offset, class="keyword">int limit) |
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167 | throws TorqueException |
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168 | { |
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169 | 0 | if ( limit < 0 && offset >= 0 ) // Offset only test |
170 | { |
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171 | 0 | return; |
172 | } |
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173 | 0 | if (limit + offset > 0) |
174 | { |
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175 | 0 | query.setRowcount(String.valueOf(limit + offset)); |
176 | } |
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177 | 0 | else if (limit + offset == 0) |
178 | { |
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179 | // This is necessary to create the empty result set that Torque expects |
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180 | 0 | query.getWhereClause().add(SqlExpression.build("1", new Integer(0), Criteria.EQUAL)); |
181 | } |
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182 | 0 | } |
183 | ||
184 | /** |
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185 | * This method overrides the JDBC escapes used to format dates |
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186 | * using a <code>DateFormat</code>. As of version 11, the Sybase |
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187 | * JDBC driver does not implement JDBC 3.0 escapes. |
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188 | * |
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189 | * @param date the date to format |
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190 | * @return The properly formatted date String. |
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191 | */ |
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192 | public String getDateString(Date date) |
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193 | { |
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194 | 0 | char delim = getStringDelimiter(); |
195 | 0 | return (delim + new SimpleDateFormat(DATE_FORMAT).format(date) + delim); |
196 | } |
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197 | ||
198 | /** |
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199 | * Determines whether backslashes (\) should be escaped in explicit SQL |
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200 | * strings. If true is returned, a BACKSLASH will be changed to "\\". |
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201 | * If false is returned, a BACKSLASH will be left as "\". |
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202 | * |
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203 | * Sybase (and MSSQL) doesn't define a default escape character, |
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204 | * so false is returned. |
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205 | * |
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206 | * @return false |
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207 | * @see org.apache.torque.adapter.DB#escapeText() |
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208 | */ |
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209 | public boolean escapeText() |
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210 | { |
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211 | 0 | return false; |
212 | } |
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213 | ||
214 | /** |
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215 | * Whether an escape clause in like should be used. |
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216 | * Example : select * from AUTHOR where AUTHOR.NAME like '\_%' ESCAPE '\'; |
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217 | * |
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218 | * Sybase needs this, so this implementation always returns |
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219 | * <code>true</code>. |
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220 | * |
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221 | * @return whether the escape clause should be appended or not. |
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222 | */ |
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223 | public boolean useEscapeClauseForLike() |
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224 | { |
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225 | 0 | return true; |
226 | } |
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227 | } |
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