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1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | ||
18 | ||
19 | package org.apache.commons.beanutils; | |
20 | ||
21 | ||
22 | import java.sql.ResultSet; | |
23 | import java.sql.SQLException; | |
24 | import java.util.Iterator; | |
25 | ||
26 | ||
27 | /** | |
28 | * <p>Implementation of <code>DynaClass</code> for DynaBeans that wrap the | |
29 | * <code>java.sql.Row</code> objects of a <code>java.sql.ResultSet</code>. | |
30 | * The normal usage pattern is something like:</p> | |
31 | * <pre> | |
32 | * ResultSet rs = ...; | |
33 | * ResultSetDynaClass rsdc = new ResultSetDynaClass(rs); | |
34 | * Iterator rows = rsdc.iterator(); | |
35 | * while (rows.hasNext()) { | |
36 | * DynaBean row = (DynaBean) rows.next(); | |
37 | * ... process this row ... | |
38 | * } | |
39 | * rs.close(); | |
40 | * </pre> | |
41 | * | |
42 | * <p>Each column in the result set will be represented as a DynaBean | |
43 | * property of the corresponding name (optionally forced to lower case | |
44 | * for portability).</p> | |
45 | * | |
46 | * <p><strong>WARNING</strong> - Any {@link DynaBean} instance returned by | |
47 | * this class, or from the <code>Iterator</code> returned by the | |
48 | * <code>iterator()</code> method, is directly linked to the row that the | |
49 | * underlying result set is currently positioned at. This has the following | |
50 | * implications:</p> | |
51 | * <ul> | |
52 | * <li>Once you retrieve a different {@link DynaBean} instance, you should | |
53 | * no longer use any previous instance.</li> | |
54 | * <li>Changing the position of the underlying result set will change the | |
55 | * data that the {@link DynaBean} references.</li> | |
56 | * <li>Once the underlying result set is closed, the {@link DynaBean} | |
57 | * instance may no longer be used.</li> | |
58 | * </ul> | |
59 | * | |
60 | * <p>Any database data that you wish to utilize outside the context of the | |
61 | * current row of an open result set must be copied. For example, you could | |
62 | * use the following code to create standalone copies of the information in | |
63 | * a result set:</p> | |
64 | * <pre> | |
65 | * ArrayList results = new ArrayList(); // To hold copied list | |
66 | * ResultSetDynaClass rsdc = ...; | |
67 | * DynaProperty[] properties = rsdc.getDynaProperties(); | |
68 | * BasicDynaClass bdc = | |
69 | * new BasicDynaClass("foo", BasicDynaBean.class, | |
70 | * rsdc.getDynaProperties()); | |
71 | * Iterator rows = rsdc.iterator(); | |
72 | * while (rows.hasNext()) { | |
73 | * DynaBean oldRow = (DynaBean) rows.next(); | |
74 | * DynaBean newRow = bdc.newInstance(); | |
75 | * PropertyUtils.copyProperties(newRow, oldRow); | |
76 | * results.add(newRow); | |
77 | * } | |
78 | * </pre> | |
79 | * | |
80 | * @author Craig R. McClanahan | |
81 | * @version $Revision: 926685 $ $Date: 2010-03-23 13:59:08 -0400 (Tue, 23 Mar 2010) $ | |
82 | */ | |
83 | ||
84 | public class ResultSetDynaClass extends JDBCDynaClass implements DynaClass { | |
85 | ||
86 | ||
87 | // ----------------------------------------------------------- Constructors | |
88 | ||
89 | ||
90 | /** | |
91 | * <p>Construct a new ResultSetDynaClass for the specified | |
92 | * <code>ResultSet</code>. The property names corresponding | |
93 | * to column names in the result set will be lower cased.</p> | |
94 | * | |
95 | * @param resultSet The result set to be wrapped | |
96 | * | |
97 | * @exception NullPointerException if <code>resultSet</code> | |
98 | * is <code>null</code> | |
99 | * @exception SQLException if the metadata for this result set | |
100 | * cannot be introspected | |
101 | */ | |
102 | 7 |
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103 | ||
104 | 7 | this(resultSet, true); |
105 | ||
106 | } | |
107 | ||
108 | ||
109 | /** | |
110 | * <p>Construct a new ResultSetDynaClass for the specified | |
111 | * <code>ResultSet</code>. The property names corresponding | |
112 | * to the column names in the result set will be lower cased or not, | |
113 | * depending on the specified <code>lowerCase</code> value.</p> | |
114 | * | |
115 | * <p><strong>WARNING</strong> - If you specify <code>false</code> | |
116 | * for <code>lowerCase</code>, the returned property names will | |
117 | * exactly match the column names returned by your JDBC driver. | |
118 | * Because different drivers might return column names in different | |
119 | * cases, the property names seen by your application will vary | |
120 | * depending on which JDBC driver you are using.</p> | |
121 | * | |
122 | * @param resultSet The result set to be wrapped | |
123 | * @param lowerCase Should property names be lower cased? | |
124 | * | |
125 | * @exception NullPointerException if <code>resultSet</code> | |
126 | * is <code>null</code> | |
127 | * @exception SQLException if the metadata for this result set | |
128 | * cannot be introspected | |
129 | */ | |
130 | 8 |
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131 | throws SQLException { | |
132 | ||
133 | 8 | this(resultSet, lowerCase, false); |
134 | ||
135 | } | |
136 | ||
137 | ||
138 | /** | |
139 | * <p>Construct a new ResultSetDynaClass for the specified | |
140 | * <code>ResultSet</code>. The property names corresponding | |
141 | * to the column names in the result set will be lower cased or not, | |
142 | * depending on the specified <code>lowerCase</code> value.</p> | |
143 | * | |
144 | * <p><strong>WARNING</strong> - If you specify <code>false</code> | |
145 | * for <code>lowerCase</code>, the returned property names will | |
146 | * exactly match the column names returned by your JDBC driver. | |
147 | * Because different drivers might return column names in different | |
148 | * cases, the property names seen by your application will vary | |
149 | * depending on which JDBC driver you are using.</p> | |
150 | * | |
151 | * @param resultSet The result set to be wrapped | |
152 | * @param lowerCase Should property names be lower cased? | |
153 | * @param useColumnLabel true if the column label should be used, otherwise false | |
154 | * | |
155 | * @exception NullPointerException if <code>resultSet</code> | |
156 | * is <code>null</code> | |
157 | * @exception SQLException if the metadata for this result set | |
158 | * cannot be introspected | |
159 | * @since 1.8.3 | |
160 | */ | |
161 | 8 |
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162 | throws SQLException { | |
163 | ||
164 | 8 | if (resultSet == null) { |
165 | 0 | throw new NullPointerException(); |
166 | } | |
167 | 8 | this.resultSet = resultSet; |
168 | 8 | this.lowerCase = lowerCase; |
169 | 8 | setUseColumnLabel(useColumnLabel); |
170 | 8 | introspect(resultSet); |
171 | ||
172 | } | |
173 | ||
174 | ||
175 | // ----------------------------------------------------- Instance Variables | |
176 | ||
177 | ||
178 | /** | |
179 | * <p>The <code>ResultSet</code> we are wrapping.</p> | |
180 | */ | |
181 | protected ResultSet resultSet = null; | |
182 | ||
183 | ||
184 | // --------------------------------------------------------- Public Methods | |
185 | ||
186 | ||
187 | /** | |
188 | * <p>Return an <code>Iterator</code> of {@link DynaBean} instances for | |
189 | * each row of the wrapped <code>ResultSet</code>, in "forward" order. | |
190 | * Unless the underlying result set supports scrolling, this method | |
191 | * should be called only once.</p> | |
192 | * @return An <code>Iterator</code> of {@link DynaBean} instances | |
193 | */ | |
194 | 3 |
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195 | ||
196 | 3 | return (new ResultSetIterator(this)); |
197 | ||
198 | } | |
199 | ||
200 | ||
201 | /** | |
202 | * Get a value from the {@link ResultSet} for the specified | |
203 | * property name. | |
204 | * | |
205 | * @param name The property name | |
206 | * @return The value | |
207 | * @throws SQLException if an error occurs | |
208 | * @since 1.8.0 | |
209 | */ | |
210 | 8 |
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211 | 8 | return getObject(getResultSet(), name); |
212 | } | |
213 | ||
214 | // -------------------------------------------------------- Package Methods | |
215 | ||
216 | ||
217 | /** | |
218 | * <p>Return the result set we are wrapping.</p> | |
219 | */ | |
220 | 20 |
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221 | ||
222 | 20 | return (this.resultSet); |
223 | ||
224 | } | |
225 | ||
226 | ||
227 | // ------------------------------------------------------ Protected Methods | |
228 | ||
229 | /** | |
230 | * <p>Loads the class of the given name which by default uses the class loader used | |
231 | * to load this library. | |
232 | * Dervations of this class could implement alternative class loading policies such as | |
233 | * using custom ClassLoader or using the Threads's context class loader etc. | |
234 | * </p> | |
235 | * @param className The name of the class to load | |
236 | * @return The loaded class | |
237 | * @throws SQLException if the class cannot be loaded | |
238 | */ | |
239 | 80 |
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240 | ||
241 | 80 | try { |
242 | 80 | return getClass().getClassLoader().loadClass(className); |
243 | } | |
244 | catch (Exception e) { | |
245 | 0 | throw new SQLException("Cannot load column class '" + |
246 | className + "': " + e); | |
247 | } | |
248 | } | |
249 | } |
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