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org.apache.torque.adapter.DBSapDB |
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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 | ||
26 | /** |
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27 | * This is used to connect to SapDB databases. |
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28 | * |
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29 | * <a href="http://www.sapdb.org">http://www.sapdb.org</a> |
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30 | * |
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31 | * @author <a href="mailto:dave.polito@planetcad.com">Dave Polito</a> |
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32 | * @version $Id: DBSapDB.java 473821 2006-11-11 22:37:25Z tv $ |
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33 | */ |
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34 | public class DBSapDB extends AbstractDBAdapter |
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35 | { |
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36 | /** |
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37 | * Serial version |
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38 | */ |
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39 | private static final long serialVersionUID = 8277068258155186370L; |
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40 | ||
41 | /** |
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42 | * Empty constructor. |
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43 | */ |
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44 | protected DBSapDB() |
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45 | 0 | { |
46 | 0 | } |
47 | ||
48 | /** |
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49 | * This method is used to ignore case. |
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50 | * |
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51 | * @param in The string to transform to upper case. |
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52 | * @return The upper case string. |
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53 | */ |
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54 | public String toUpperCase(String in) |
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55 | { |
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56 | 0 | return new StringBuffer("UPPER(").append(in).append(")").toString(); |
57 | } |
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58 | ||
59 | /** |
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60 | * This method is used to ignore case. |
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61 | * |
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62 | * @param in The string whose case to ignore. |
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63 | * @return The string in a case that can be ignored. |
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64 | */ |
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65 | public String ignoreCase(String in) |
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66 | { |
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67 | 0 | return new StringBuffer("UPPER(").append(in).append(")").toString(); |
68 | } |
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69 | ||
70 | /** |
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71 | * @see org.apache.torque.adapter.DB#getIDMethodType() |
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72 | */ |
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73 | public String getIDMethodType() |
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74 | { |
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75 | 0 | return SEQUENCE; |
76 | } |
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77 | ||
78 | /** |
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79 | * Returns the next key from a sequence. Uses the following |
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80 | * implementation: |
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81 | * |
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82 | * <blockquote><code><pre> |
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83 | * select sequenceName.nextval from dual |
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84 | * </pre></code></blockquote> |
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85 | * |
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86 | * @param sequenceName The name of the sequence (should be of type |
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87 | * <code>String</code>). |
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88 | * @return SQL to retreive the next database key. |
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89 | * @see org.apache.torque.adapter.DB#getIDMethodSQL(Object) |
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90 | */ |
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91 | public String getIDMethodSQL(Object sequenceName) |
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92 | { |
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93 | 0 | return ("select " + sequenceName + ".nextval from dual"); |
94 | } |
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95 | ||
96 | /** |
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97 | * Locks the specified table. |
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98 | * |
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99 | * @param con The JDBC connection to use. |
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100 | * @param table The name of the table to lock. |
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101 | * @exception SQLException No Statement could be created or executed. |
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102 | */ |
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103 | public void lockTable(Connection con, String table) throws SQLException |
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104 | { |
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105 | 0 | Statement statement = con.createStatement(); |
106 | ||
107 | 0 | StringBuffer stmt = new StringBuffer(); |
108 | 0 | stmt.append("SELECT next_id FROM ") |
109 | .append(table) |
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110 | .append(" FOR UPDATE"); |
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111 | ||
112 | 0 | statement.executeQuery(stmt.toString()); |
113 | 0 | } |
114 | ||
115 | /** |
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116 | * This method is for the SqlExpression.quoteAndEscape rules. The rule is, |
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117 | * any string in a SqlExpression with a BACKSLASH will either be changed to |
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118 | * "\\" or left as "\". SapDB does not need the escape character. |
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119 | * |
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120 | * @return false. |
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121 | */ |
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122 | ||
123 | public boolean escapeText() |
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124 | { |
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125 | 0 | return false; |
126 | } |
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127 | ||
128 | /** |
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129 | * Unlocks the specified table. |
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130 | * |
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131 | * @param con The JDBC connection to use. |
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132 | * @param table The name of the table to unlock. |
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133 | * @exception SQLException No Statement could be created or |
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134 | * executed. |
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135 | */ |
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136 | public void unlockTable(Connection con, String table) throws SQLException |
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137 | { |
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138 | // Tables in SapDB are unlocked when a commit is issued. The |
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139 | // user may have issued a commit but do it here to be sure. |
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140 | 0 | con.commit(); |
141 | 0 | } |
142 | } |
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