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1 771 jeremybenn
/* Connection.java -- Manage a database connection.
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   Copyright (C) 1999, 2000, 2002, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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6
GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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11
GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
General Public License for more details.
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16
You should have received a copy of the GNU General Public License
17
along with GNU Classpath; see the file COPYING.  If not, write to the
18
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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21
Linking this library statically or dynamically with other modules is
22
making a combined work based on this library.  Thus, the terms and
23
conditions of the GNU General Public License cover the whole
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combination.
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26
As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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38
 
39
package java.sql;
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41
import java.util.Map;
42
 
43
/**
44
 * This interface provides methods for managing a connection to a database.
45
 *
46
 * @author Aaron M. Renn (arenn@urbanophile.com)
47
 */
48
public interface Connection
49
{
50
  /**
51
   * This transaction isolation level indicates that transactions are not
52
   * supported.
53
   */
54
  int TRANSACTION_NONE = 0;
55
 
56
  /**
57
   * This transaction isolation level indicates that one transaction can
58
   * read modifications by other transactions before the other transactions
59
   * have committed their changes.  This could result in invalid reads.
60
   */
61
  int TRANSACTION_READ_UNCOMMITTED = 1;
62
 
63
  /**
64
   * This transaction isolation level indicates that only committed data from
65
   * other transactions will be read.  If a transaction reads a row, then
66
   * another transaction commits a change to that row, the first transaction
67
   * would retrieve the changed row on subsequent reads of the same row.
68
   */
69
  int TRANSACTION_READ_COMMITTED = 2;
70
 
71
  /**
72
   * This transaction isolation level indicates that only committed data from
73
   * other transactions will be read.  It also ensures that data read from
74
   * a row will not be different on a subsequent read even if another
75
   * transaction commits a change.
76
   */
77
  int TRANSACTION_REPEATABLE_READ = 4;
78
 
79
  /**
80
   * This transaction isolation level indicates that only committed data from
81
   * other transactions will be read.  It also ensures that data read from
82
   * a row will not be different on a subsequent read even if another
83
   * transaction commits a change.  Additionally, rows modified by other
84
   * transactions will not affect the result set returned during subsequent
85
   * executions of the same WHERE clause in this transaction.
86
   */
87
  int TRANSACTION_SERIALIZABLE = 8;
88
 
89
  /**
90
   * This method creates a new SQL statement.  The default result set type
91
   * and concurrency will be used.
92
   *
93
   * @return A new <code>Statement</code> object.
94
   * @exception SQLException If an error occurs.
95
   * @see Statement
96
   */
97
  Statement createStatement() throws SQLException;
98
 
99
  /**
100
   * This method creates a new <code>PreparedStatement</code> for the specified
101
   * SQL string.  This method is designed for use with parameterized
102
   * statements.  The default result set type and concurrency will be used.
103
   *
104
   * @param sql The SQL statement to use in creating this
105
   *            <code>PreparedStatement</code>.
106
   * @return A new <code>PreparedStatement</code>.
107
   * @exception SQLException If an error occurs.
108
   * @see PreparedStatement
109
   */
110
  PreparedStatement prepareStatement(String sql) throws SQLException;
111
 
112
  /**
113
   * This method creates a new <code>CallableStatement</code> for the
114
   * specified SQL string.  Thie method is designed to be used with
115
   * stored procedures.  The default result set type and concurrency
116
   * will be used.
117
   *
118
   * @param sql The SQL statement to use in creating this
119
   *            <code>CallableStatement</code>.
120
   * @return A new <code>CallableStatement</code>.
121
   * @exception SQLException If an error occurs.
122
   * @see CallableStatement
123
   */
124
  CallableStatement prepareCall(String sql) throws SQLException;
125
 
126
  /**
127
   * This method converts the specified generic SQL statement into the
128
   * native grammer of the database this object is connected to.
129
   *
130
   * @param sql The JDBC generic SQL statement.
131
   * @return The native SQL statement.
132
   * @exception SQLException If an error occurs.
133
   */
134
  String nativeSQL(String sql) throws SQLException;
135
 
136
  /**
137
   * This method turns auto commit mode on or off.  In auto commit mode,
138
   * every SQL statement is committed its own transaction.  Otherwise a
139
   * transaction must be explicitly committed or rolled back.
140
   *
141
   * @param autoCommit <code>true</code> to enable auto commit mode,
142
   *                   <code>false</code> to disable it.
143
   * @exception SQLException If an error occurs.
144
   * @see #commit()
145
   * @see #rollback()
146
   */
147
  void setAutoCommit(boolean autoCommit) throws SQLException;
148
 
149
  /**
150
   * This method tests whether or not auto commit mode is currently enabled.
151
   * In auto commit mode,  every SQL statement is committed its own transaction.
152
   * Otherwise a transaction must be explicitly committed or rolled back.
153
   *
154
   * @return <code>true</code> if auto commit mode is enabled,
155
   *         <code>false</code> otherwise.
156
   * @exception SQLException If an error occurs.
157
   * @see #commit()
158
   * @see #rollback()
159
   */
160
  boolean getAutoCommit() throws SQLException;
161
 
162
 /**
163
  * This method commits any SQL statements executed on this connection since
164
  * the last commit or rollback.
165
  *
166
  * @exception SQLException If an error occurs.
167
  */
168
  void commit() throws SQLException;
169
 
170
  /**
171
   * This method rolls back any SQL statements executed on this connection
172
   * since the last commit or rollback.
173
   *
174
   * @exception SQLException If an error occurs.
175
   */
176
  void rollback() throws SQLException;
177
 
178
  /**
179
   * This method immediately closes this database connection.
180
   *
181
   * @exception SQLException If an error occurs.
182
   */
183
  void close() throws SQLException;
184
 
185
  /**
186
   * This method tests whether or not this connection has been closed.
187
   *
188
   * @return <code>true</code> if the connection is closed, <code>false</code>
189
   *         otherwise.
190
   * @exception SQLException If an error occurs.
191
   */
192
  boolean isClosed() throws SQLException;
193
 
194
  /**
195
   * This method returns the meta data for this database connection.
196
   *
197
   * @return The meta data for this database.
198
   * @exception SQLException If an error occurs.
199
   * @see DatabaseMetaData
200
   */
201
  DatabaseMetaData getMetaData() throws SQLException;
202
 
203
  /**
204
   * This method turns read only mode on or off.  It may not be called while
205
   * a transaction is in progress.
206
   *
207
   * @param readOnly <code>true</code> if this connection is read only,
208
   *                 <code>false</code> otherwise.
209
   * @exception SQLException If an error occurs.
210
   */
211
  void setReadOnly(boolean readOnly) throws SQLException;
212
 
213
  /**
214
   * This method tests whether or not this connection is in read only mode.
215
   *
216
   * @return <code>true</code> if the connection is read only <code>false</code>
217
   *         otherwise.
218
   * @exception SQLException If an error occurs.
219
   */
220
  boolean isReadOnly() throws SQLException;
221
 
222
  /**
223
   * This method sets the name of the catalog in use by this connection.
224
   * Note that this method does nothing if catalogs are not supported by
225
   * this database.
226
   *
227
   * @param catalog The name of the catalog to use for this connection.
228
   * @exception SQLException If an error occurs.
229
   */
230
  void setCatalog(String catalog) throws SQLException;
231
 
232
  /**
233
   * This method returns the name of the catalog in use by this connection,
234
   * if any.
235
   *
236
   * @return The name of the catalog, or <code>null</code> if none
237
   *         exists or catalogs are not supported by this database.
238
   * @exception SQLException If an error occurs.
239
   */
240
  String getCatalog() throws SQLException;
241
 
242
  /**
243
   * This method sets the current transaction isolation mode.  This must
244
   * be one of the constants defined in this interface.
245
   *
246
   * @param level The transaction isolation level.
247
   * @exception SQLException If an error occurs.
248
   */
249
  void setTransactionIsolation(int level) throws SQLException;
250
 
251
  /**
252
   * This method returns the current transaction isolation mode.  This will
253
   * be one of the constants defined in this interface.
254
   *
255
   * @return The transaction isolation level.
256
   * @exception SQLException If an error occurs.
257
   */
258
  int getTransactionIsolation() throws SQLException;
259
 
260
  /**
261
   * This method returns the first warning that occurred on this connection,
262
   * if any.  If there were any subsequence warnings, they will be chained
263
   * to the first one.
264
   *
265
   * @return The first <code>SQLWarning</code> that occurred, or
266
   *         <code>null</code> if there have been no warnings.
267
   * @exception SQLException If an error occurs.
268
   */
269
  SQLWarning getWarnings() throws SQLException;
270
 
271
  /**
272
   * This method clears all warnings that have occurred on this connection.
273
   *
274
   * @exception SQLException If an error occurs.
275
   */
276
  void clearWarnings() throws SQLException;
277
 
278
  /**
279
   * This method creates a new SQL statement with the specified type and
280
   * concurrency.  Valid values for these parameters are specified in the
281
   * <code>ResultSet</code> class.
282
   *
283
   * @param resultSetType The type of result set to use for this statement.
284
   * @param resultSetConcurrency  The type of concurrency to be used in
285
   *                              the result set for this statement.
286
   * @return A new <code>Statement</code> object.
287
   * @exception SQLException If an error occurs.
288
   * @see Statement
289
   * @see ResultSet
290
   */
291
  Statement createStatement(int resultSetType, int resultSetConcurrency)
292
    throws SQLException;
293
 
294
  /**
295
   * This method creates a new <code>PreparedStatement</code> for the specified
296
   * SQL string.  This method is designed for use with parameterized
297
   * statements.  The specified result set type and concurrency will be used.
298
   * Valid values for these parameters are specified in the
299
   * <code>ResultSet</code> class.
300
   *
301
   * @param sql The SQL statement to use in creating this
302
   *            <code>PreparedStatement</code>.
303
   * @param resultSetType The type of result set to use for this statement.
304
   * @param resultSetConcurrency  The type of concurrency to be used in
305
   *                              the result set for this statement.
306
   * @return A new <code>PreparedStatement</code>.
307
   * @exception SQLException If an error occurs.
308
   * @see PreparedStatement
309
   * @see ResultSet
310
   */
311
  PreparedStatement prepareStatement(String sql, int resultSetType,
312
    int resultSetConcurrency) throws SQLException;
313
 
314
  /**
315
   * This method creates a new <code>CallableStatement</code> for the
316
   * specified SQL string.  Thie method is designed to be used with
317
   * stored procedures.  The specified result set type and concurrency
318
   * will be used.  Valid values for these parameters are specified in the
319
   * <code>ResultSet</code> class.
320
   *
321
   * @param sql The SQL statement to use in creating this
322
   *            <code>PreparedStatement</code>.
323
   * @param resultSetType The type of result set to use for this statement.
324
   * @param resultSetConcurrency  The type of concurrency to be used in
325
   *                              the result set for this statement.
326
   * @return A new <code>CallableStatement</code>.
327
   * @exception SQLException If an error occurs.
328
   * @see CallableStatement
329
   * @see ResultSet
330
   */
331
  CallableStatement prepareCall(String sql, int resultSetType, int
332
    resultSetConcurrency) throws SQLException;
333
 
334
  /**
335
   * This method returns the mapping of SQL types to Java classes
336
   * currently in use by this connection.  This mapping will have no
337
   * entries unless they have been manually added.
338
   *
339
   * @return The SQL type to Java class mapping.
340
   * @exception SQLException If an error occurs.
341
   */
342
  Map<String, Class<?>> getTypeMap() throws SQLException;
343
 
344
  /**
345
   * This method sets the mapping table for SQL types to Java classes.
346
   * Any entries in this map override the defaults.
347
   *
348
   * @param map The new SQL mapping table.
349
   * @exception SQLException If an error occurs.
350
   */
351
  void setTypeMap(Map<String, Class<?>> map) throws SQLException;
352
 
353
  /**
354
   * Sets the default holdability of <code>ResultSet</code>S that are created
355
   * from <code>Statement</code>S using this <code>Connection</code>.
356
   *
357
   * @param holdability The default holdability value to set, this must be one
358
   *                    of <code>ResultSet.HOLD_CURSORS_OVER_COMMIT</code> or
359
   *                    <code>ResultSet.CLOSE_CURSORS_AT_COMMIT</code>.
360
   * @exception SQLException If an error occurs.
361
   * @see ResultSet
362
   * @since 1.4
363
   */
364
  void setHoldability(int holdability) throws SQLException;
365
 
366
  /**
367
   * Gets the default holdability of <code>ResultSet</code>S that are created
368
   * from <code>Statement</code>S using this <code>Connection</code>.
369
   *
370
   * @return The current default holdability value, this must be one of
371
   *          <code>ResultSet.HOLD_CURSORS_OVER_COMMIT</code> or
372
   *          <code>ResultSet.CLOSE_CURSORS_AT_COMMIT</code>.
373
   * @exception SQLException If an error occurs.
374
   * @see ResultSet
375
   * @since 1.4
376
   */
377
  int getHoldability() throws SQLException;
378
 
379
  /**
380
   * Creates a new unnamed savepoint for this <code>Connection</code>
381
   *
382
   * @return The <code>Savepoint</code> object representing the savepoint.
383
   * @exception SQLException If an error occurs.
384
   * @since 1.4
385
   */
386
  Savepoint setSavepoint() throws SQLException;
387
 
388
  /**
389
   * Creates a new savepoint with the specifiend name for this
390
   * <code>Connection</code>.
391
   *
392
   * @param name The name of the savepoint.
393
   * @return The <code>Savepoint</code> object representing the savepoint.
394
   * @exception SQLException If an error occurs.
395
   * @since 1.4
396
   */
397
  Savepoint setSavepoint(String name) throws SQLException;
398
 
399
  /**
400
   * Undoes all changes made after the specified savepoint was set.
401
   *
402
   * @param savepoint The safepoint to roll back to.
403
   * @exception SQLException If an error occurs.
404
   * @since 1.4
405
   */
406
  void rollback(Savepoint savepoint) throws SQLException;
407
 
408
  /**
409
   * Removes the specified savepoint from this <code>Connection</code>.
410
   * Refering to a savepoint after it was removed is an error and will throw an
411
   * SQLException.
412
   *
413
   * @param savepoint The savepoint to release.
414
   * @exception SQLException If an error occurs.
415
   * @since 1.4
416
   */
417
  void releaseSavepoint(Savepoint savepoint) throws SQLException;
418
 
419
  /**
420
   * This method creates a new SQL statement with the specified type,
421
   * concurrency and holdability, instead of using the defaults.  Valid values
422
   * for these parameters are specified in the <code>ResultSet</code> class.
423
   *
424
   * @param resultSetType The type of result set to use for this statement.
425
   * @param resultSetConcurrency The type of concurrency to be used in
426
   *                             the result set for this statement.
427
   * @param resultSetHoldability The type of holdability to be usd in the
428
   *                             result set for this statement.
429
   * @return A new <code>Statement</code>
430
   * @exception SQLException If an error occurs.
431
   * @see ResultSet
432
   * @since 1.4
433
   */
434
  Statement createStatement(int resultSetType, int
435
      resultSetConcurrency, int resultSetHoldability) throws SQLException;
436
 
437
  /**
438
   * This method creates a new <code>PreparedStatement</code> for the specified
439
   * SQL string.  This method is designed for use with parameterized
440
   * statements.  The specified result set type, concurrency and holdability
441
   * will be used. Valid values for these parameters are specified in the
442
   * <code>ResultSet</code> class.
443
   *
444
   * @param sql The SQL statement to use in creating this
445
   *            <code>PreparedStatement</code>.
446
   * @param resultSetType The type of result set to use for this statement.
447
   * @param resultSetConcurrency The type of concurrency to be used in
448
   *                             the result set for this statement.
449
   * @param resultSetHoldability The type of holdability to be usd in the
450
   *                             result set for this statement.
451
   * @return A new <code>PreparedStatement</code>.
452
   * @exception SQLException If an error occurs.
453
   * @see PreparedStatement
454
   * @see ResultSet
455
   * @since 1.4
456
   */
457
  PreparedStatement prepareStatement(String sql, int resultSetType, int
458
      resultSetConcurrency, int resultSetHoldability) throws SQLException;
459
 
460
  /**
461
   * This method creates a new <code>CallableStatement</code> for the
462
   * specified SQL string.  Thie method is designed to be used with
463
   * stored procedures.  The specified result set type, concurrency and
464
   * holdability will be used.  Valid values for these parameters are specified
465
   * in the <code>ResultSet</code> class.
466
   *
467
   * @param sql The SQL statement to use in creating this
468
   *            <code>PreparedStatement</code>.
469
   * @param resultSetType The type of result set to use for this statement.
470
   * @param resultSetConcurrency The type of concurrency to be used in
471
   *                             the result set for this statement.
472
   * @param resultSetHoldability The type of holdability to be used in the
473
   *                             result set for this statement.
474
   * @return A new <code>CallableStatement</code>.
475
   * @exception SQLException If an error occurs.
476
   * @see CallableStatement
477
   * @see ResultSet
478
   * @since 1.4
479
   */
480
  CallableStatement prepareCall(String sql, int resultSetType, int
481
      resultSetConcurrency, int resultSetHoldability) throws SQLException;
482
 
483
  /**
484
   * @since 1.4
485
   */
486
  PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)
487
      throws SQLException;
488
 
489
  /**
490
   * @since 1.4
491
   */
492
  PreparedStatement prepareStatement(String sql, int[] columnIndexes)
493
      throws SQLException;
494
 
495
  /**
496
   * @since 1.4
497
   */
498
  PreparedStatement prepareStatement(String sql, String[] columnNames)
499
      throws SQLException;
500
}

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