summaryrefslogtreecommitdiff
path: root/spring-jdbc/src/main/java/org/springframework/jdbc/object/RdbmsOperation.java
blob: e285f1b45bd29b98864c5e4654ba78d43dc729fb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.object;

import java.sql.ResultSet;
import java.sql.Types;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import javax.sql.DataSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.dao.InvalidDataAccessApiUsageException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.SqlParameter;
import org.springframework.util.Assert;

/**
 * An "RDBMS operation" is a multi-threaded, reusable object representing a query,
 * update, or stored procedure call. An RDBMS operation is <b>not</b> a command,
 * as a command is not reusable. However, execute methods may take commands as
 * arguments. Subclasses should be JavaBeans, allowing easy configuration.
 *
 * <p>This class and subclasses throw runtime exceptions, defined in the
 * {@code org.springframework.dao} package (and as thrown by the
 * {@code org.springframework.jdbc.core} package, which the classes
 * in this package use under the hood to perform raw JDBC operations).
 *
 * <p>Subclasses should set SQL and add parameters before invoking the
 * {@link #compile()} method. The order in which parameters are added is
 * significant. The appropriate {@code execute} or {@code update}
 * method can then be invoked.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @see SqlQuery
 * @see SqlUpdate
 * @see StoredProcedure
 * @see org.springframework.jdbc.core.JdbcTemplate
 */
public abstract class RdbmsOperation implements InitializingBean {

	/** Logger available to subclasses */
	protected final Log logger = LogFactory.getLog(getClass());

	/** Lower-level class used to execute SQL */
	private JdbcTemplate jdbcTemplate = new JdbcTemplate();

	private int resultSetType = ResultSet.TYPE_FORWARD_ONLY;

	private boolean updatableResults = false;

	private boolean returnGeneratedKeys = false;

	private String[] generatedKeysColumnNames;

	private String sql;

	private final List<SqlParameter> declaredParameters = new LinkedList<SqlParameter>();

	/**
	 * Has this operation been compiled? Compilation means at
	 * least checking that a DataSource and sql have been provided,
	 * but subclasses may also implement their own custom validation.
	 */
	private volatile boolean compiled;


	/**
	 * An alternative to the more commonly used {@link #setDataSource} when you want to
	 * use the same {@link JdbcTemplate} in multiple {@code RdbmsOperations}. This is
	 * appropriate if the {@code JdbcTemplate} has special configuration such as a
	 * {@link org.springframework.jdbc.support.SQLExceptionTranslator} to be reused.
	 */
	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		Assert.notNull(jdbcTemplate, "JdbcTemplate must not be null");
		this.jdbcTemplate = jdbcTemplate;
	}

	/**
	 * Return the {@link JdbcTemplate} used by this operation object.
	 */
	public JdbcTemplate getJdbcTemplate() {
		return this.jdbcTemplate;
	}

	/**
	 * Set the JDBC {@link DataSource} to obtain connections from.
	 * @see org.springframework.jdbc.core.JdbcTemplate#setDataSource
	 */
	public void setDataSource(DataSource dataSource) {
		this.jdbcTemplate.setDataSource(dataSource);
	}

	/**
	 * Set the fetch size for this RDBMS operation. This is important for processing
	 * large result sets: Setting this higher than the default value will increase
	 * processing speed at the cost of memory consumption; setting this lower can
	 * avoid transferring row data that will never be read by the application.
	 * <p>Default is 0, indicating to use the driver's default.
	 * @see org.springframework.jdbc.core.JdbcTemplate#setFetchSize
	 */
	public void setFetchSize(int fetchSize) {
		this.jdbcTemplate.setFetchSize(fetchSize);
	}

	/**
	 * Set the maximum number of rows for this RDBMS operation. This is important
	 * for processing subsets of large result sets, avoiding to read and hold
	 * the entire result set in the database or in the JDBC driver.
	 * <p>Default is 0, indicating to use the driver's default.
	 * @see org.springframework.jdbc.core.JdbcTemplate#setMaxRows
	 */
	public void setMaxRows(int maxRows) {
		this.jdbcTemplate.setMaxRows(maxRows);
	}

	/**
	 * Set the query timeout for statements that this RDBMS operation executes.
	 * <p>Default is 0, indicating to use the JDBC driver's default.
	 * <p>Note: Any timeout specified here will be overridden by the remaining
	 * transaction timeout when executing within a transaction that has a
	 * timeout specified at the transaction level.
	 */
	public void setQueryTimeout(int queryTimeout) {
		this.jdbcTemplate.setQueryTimeout(queryTimeout);
	}

	/**
	 * Set whether to use statements that return a specific type of ResultSet.
	 * @param resultSetType the ResultSet type
	 * @see java.sql.ResultSet#TYPE_FORWARD_ONLY
	 * @see java.sql.ResultSet#TYPE_SCROLL_INSENSITIVE
	 * @see java.sql.ResultSet#TYPE_SCROLL_SENSITIVE
	 * @see java.sql.Connection#prepareStatement(String, int, int)
	 */
	public void setResultSetType(int resultSetType) {
		this.resultSetType = resultSetType;
	}

	/**
	 * Return whether statements will return a specific type of ResultSet.
	 */
	public int getResultSetType() {
		return this.resultSetType;
	}

	/**
	 * Set whether to use statements that are capable of returning
	 * updatable ResultSets.
	 * @see java.sql.Connection#prepareStatement(String, int, int)
	 */
	public void setUpdatableResults(boolean updatableResults) {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException(
					"The updateableResults flag must be set before the operation is compiled");
		}
		this.updatableResults = updatableResults;
	}

	/**
	 * Return whether statements will return updatable ResultSets.
	 */
	public boolean isUpdatableResults() {
		return this.updatableResults;
	}

	/**
	 * Set whether prepared statements should be capable of returning
	 * auto-generated keys.
	 * @see java.sql.Connection#prepareStatement(String, int)
	 */
	public void setReturnGeneratedKeys(boolean returnGeneratedKeys) {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException(
					"The returnGeneratedKeys flag must be set before the operation is compiled");
		}
		this.returnGeneratedKeys = returnGeneratedKeys;
	}

	/**
	 * Return whether statements should be capable of returning
	 * auto-generated keys.
	 */
	public boolean isReturnGeneratedKeys() {
		return this.returnGeneratedKeys;
	}

	/**
	 * Set the column names of the auto-generated keys.
	 * @see java.sql.Connection#prepareStatement(String, String[])
	 */
	public void setGeneratedKeysColumnNames(String... names) {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException(
					"The column names for the generated keys must be set before the operation is compiled");
		}
		this.generatedKeysColumnNames = names;
	}

	/**
	 * Return the column names of the auto generated keys.
	 */
	public String[] getGeneratedKeysColumnNames() {
		return this.generatedKeysColumnNames;
	}

	/**
	 * Set the SQL executed by this operation.
	 */
	public void setSql(String sql) {
		this.sql = sql;
	}

	/**
	 * Subclasses can override this to supply dynamic SQL if they wish, but SQL is
	 * normally set by calling the {@link #setSql} method or in a subclass constructor.
	 */
	public String getSql() {
		return this.sql;
	}

	/**
	 * Add anonymous parameters, specifying only their SQL types
	 * as defined in the {@code java.sql.Types} class.
	 * <p>Parameter ordering is significant. This method is an alternative
	 * to the {@link #declareParameter} method, which should normally be preferred.
	 * @param types array of SQL types as defined in the
	 * {@code java.sql.Types} class
	 * @throws InvalidDataAccessApiUsageException if the operation is already compiled
	 */
	public void setTypes(int[] types) throws InvalidDataAccessApiUsageException {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException("Cannot add parameters once query is compiled");
		}
		if (types != null) {
			for (int type : types) {
				declareParameter(new SqlParameter(type));
			}
		}
	}

	/**
	 * Declare a parameter for this operation.
	 * <p>The order in which this method is called is significant when using
	 * positional parameters. It is not significant when using named parameters
	 * with named SqlParameter objects here; it remains significant when using
	 * named parameters in combination with unnamed SqlParameter objects here.
	 * @param param the SqlParameter to add. This will specify SQL type and (optionally)
	 * the parameter's name. Note that you typically use the {@link SqlParameter} class
	 * itself here, not any of its subclasses.
	 * @throws InvalidDataAccessApiUsageException if the operation is already compiled,
	 * and hence cannot be configured further
	 */
	public void declareParameter(SqlParameter param) throws InvalidDataAccessApiUsageException {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException("Cannot add parameters once the query is compiled");
		}
		this.declaredParameters.add(param);
	}

	/**
	 * Add one or more declared parameters. Used for configuring this operation
	 * when used in a bean factory.  Each parameter will specify SQL type and (optionally)
	 * the parameter's name.
	 * @param parameters an array containing the declared {@link SqlParameter} objects
	 * @see #declaredParameters
	 */
	public void setParameters(SqlParameter... parameters) {
		if (isCompiled()) {
			throw new InvalidDataAccessApiUsageException("Cannot add parameters once the query is compiled");
		}
		for (int i = 0; i < parameters.length; i++) {
			if (parameters[i] != null) {
				this.declaredParameters.add(parameters[i]);
			}
			else {
				throw new InvalidDataAccessApiUsageException("Cannot add parameter at index " + i + " from " +
						Arrays.asList(parameters) + " since it is 'null'");
			}
		}
	}

	/**
	 * Return a list of the declared {@link SqlParameter} objects.
	 */
	protected List<SqlParameter> getDeclaredParameters() {
		return this.declaredParameters;
	}


	/**
	 * Ensures compilation if used in a bean factory.
	 */
	@Override
	public void afterPropertiesSet() {
		compile();
	}

	/**
	 * Compile this query.
	 * Ignores subsequent attempts to compile.
	 * @throws InvalidDataAccessApiUsageException if the object hasn't
	 * been correctly initialized, for example if no DataSource has been provided
	 */
	public final void compile() throws InvalidDataAccessApiUsageException {
		if (!isCompiled()) {
			if (getSql() == null) {
				throw new InvalidDataAccessApiUsageException("Property 'sql' is required");
			}

			try {
				this.jdbcTemplate.afterPropertiesSet();
			}
			catch (IllegalArgumentException ex) {
				throw new InvalidDataAccessApiUsageException(ex.getMessage());
			}

			compileInternal();
			this.compiled = true;

			if (logger.isDebugEnabled()) {
				logger.debug("RdbmsOperation with SQL [" + getSql() + "] compiled");
			}
		}
	}

	/**
	 * Is this operation "compiled"? Compilation, as in JDO,
	 * means that the operation is fully configured, and ready to use.
	 * The exact meaning of compilation will vary between subclasses.
	 * @return whether this operation is compiled and ready to use
	 */
	public boolean isCompiled() {
		return this.compiled;
	}

	/**
	 * Check whether this operation has been compiled already;
	 * lazily compile it if not already compiled.
	 * <p>Automatically called by {@code validateParameters}.
	 * @see #validateParameters
	 */
	protected void checkCompiled() {
		if (!isCompiled()) {
			logger.debug("SQL operation not compiled before execution - invoking compile");
			compile();
		}
	}

	/**
	 * Validate the parameters passed to an execute method based on declared parameters.
	 * Subclasses should invoke this method before every {@code executeQuery()}
	 * or {@code update()} method.
	 * @param parameters parameters supplied (may be {@code null})
	 * @throws InvalidDataAccessApiUsageException if the parameters are invalid
	 */
	protected void validateParameters(Object[] parameters) throws InvalidDataAccessApiUsageException {
		checkCompiled();
		int declaredInParameters = 0;
		for (SqlParameter param : this.declaredParameters) {
			if (param.isInputValueProvided()) {
				if (!supportsLobParameters() &&
						(param.getSqlType() == Types.BLOB || param.getSqlType() == Types.CLOB)) {
					throw new InvalidDataAccessApiUsageException(
							"BLOB or CLOB parameters are not allowed for this kind of operation");
				}
				declaredInParameters++;
			}
		}
		validateParameterCount((parameters != null ? parameters.length : 0), declaredInParameters);
	}

	/**
	 * Validate the named parameters passed to an execute method based on declared parameters.
	 * Subclasses should invoke this method before every {@code executeQuery()} or
	 * {@code update()} method.
	 * @param parameters parameter Map supplied (may be {@code null})
	 * @throws InvalidDataAccessApiUsageException if the parameters are invalid
	 */
	protected void validateNamedParameters(Map<String, ?> parameters) throws InvalidDataAccessApiUsageException {
		checkCompiled();
		Map<String, ?> paramsToUse = (parameters != null ? parameters : Collections.<String, Object> emptyMap());
		int declaredInParameters = 0;
		for (SqlParameter param : this.declaredParameters) {
			if (param.isInputValueProvided()) {
				if (!supportsLobParameters() &&
						(param.getSqlType() == Types.BLOB || param.getSqlType() == Types.CLOB)) {
					throw new InvalidDataAccessApiUsageException(
							"BLOB or CLOB parameters are not allowed for this kind of operation");
				}
				if (param.getName() != null && !paramsToUse.containsKey(param.getName())) {
					throw new InvalidDataAccessApiUsageException("The parameter named '" + param.getName() +
							"' was not among the parameters supplied: " + paramsToUse.keySet());
				}
				declaredInParameters++;
			}
		}
		validateParameterCount(paramsToUse.size(), declaredInParameters);
	}

	/**
	 * Validate the given parameter count against the given declared parameters.
	 * @param suppliedParamCount the number of actual parameters given
	 * @param declaredInParamCount the number of input parameters declared
	 */
	private void validateParameterCount(int suppliedParamCount, int declaredInParamCount) {
		if (suppliedParamCount < declaredInParamCount) {
			throw new InvalidDataAccessApiUsageException(suppliedParamCount + " parameters were supplied, but " +
					declaredInParamCount + " in parameters were declared in class [" + getClass().getName() + "]");
		}
		if (suppliedParamCount > this.declaredParameters.size() && !allowsUnusedParameters()) {
			throw new InvalidDataAccessApiUsageException(suppliedParamCount + " parameters were supplied, but " +
					declaredInParamCount + " parameters were declared in class [" + getClass().getName() + "]");
		}
	}


	/**
	 * Subclasses must implement this template method to perform their own compilation.
	 * Invoked after this base class's compilation is complete.
	 * <p>Subclasses can assume that SQL and a DataSource have been supplied.
	 * @throws InvalidDataAccessApiUsageException if the subclass hasn't been
	 * properly configured
	 */
	protected abstract void compileInternal() throws InvalidDataAccessApiUsageException;

	/**
	 * Return whether BLOB/CLOB parameters are supported for this kind of operation.
	 * <p>The default is {@code true}.
	 */
	protected boolean supportsLobParameters() {
		return true;
	}

	/**
	 * Return whether this operation accepts additional parameters that are
	 * given but not actually used. Applies in particular to parameter Maps.
	 * <p>The default is {@code false}.
	 * @see StoredProcedure
	 */
	protected boolean allowsUnusedParameters() {
		return false;
	}

}