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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package com.sun.rowset.internal; | ||
| 27 | |||
| 28 | import java.sql.*; | ||
| 29 | import javax.sql.*; | ||
| 30 | import java.util.*; | ||
| 31 | import java.io.*; | ||
| 32 | |||
| 33 | import com.sun.rowset.*; | ||
| 34 | import java.text.MessageFormat; | ||
| 35 | import javax.sql.rowset.*; | ||
| 36 | import javax.sql.rowset.serial.SQLInputImpl; | ||
| 37 | import javax.sql.rowset.serial.SerialArray; | ||
| 38 | import javax.sql.rowset.serial.SerialBlob; | ||
| 39 | import javax.sql.rowset.serial.SerialClob; | ||
| 40 | import javax.sql.rowset.serial.SerialStruct; | ||
| 41 | import javax.sql.rowset.spi.*; | ||
| 42 | |||
| 43 | |||
| 44 | /** | ||
| 45 | * The facility called on internally by the <code>RIOptimisticProvider</code> implementation to | ||
| 46 | * propagate changes back to the data source from which the rowset got its data. | ||
| 47 | * <P> | ||
| 48 | * A <code>CachedRowSetWriter</code> object, called a writer, has the public | ||
| 49 | * method <code>writeData</code> for writing modified data to the underlying data source. | ||
| 50 | * This method is invoked by the rowset internally and is never invoked directly by an application. | ||
| 51 | * A writer also has public methods for setting and getting | ||
| 52 | * the <code>CachedRowSetReader</code> object, called a reader, that is associated | ||
| 53 | * with the writer. The remainder of the methods in this class are private and | ||
| 54 | * are invoked internally, either directly or indirectly, by the method | ||
| 55 | * <code>writeData</code>. | ||
| 56 | * <P> | ||
| 57 | * Typically the <code>SyncFactory</code> manages the <code>RowSetReader</code> and | ||
| 58 | * the <code>RowSetWriter</code> implementations using <code>SyncProvider</code> objects. | ||
| 59 | * Standard JDBC RowSet implementations provide an object instance of this | ||
| 60 | * writer by invoking the <code>SyncProvider.getRowSetWriter()</code> method. | ||
| 61 | * | ||
| 62 | * @version 0.2 | ||
| 63 | * @author Jonathan Bruce | ||
| 64 | * @see javax.sql.rowset.spi.SyncProvider | ||
| 65 | * @see javax.sql.rowset.spi.SyncFactory | ||
| 66 | * @see javax.sql.rowset.spi.SyncFactoryException | ||
| 67 | */ | ||
| 68 | public class CachedRowSetWriter implements TransactionalWriter, Serializable { | ||
| 69 | |||
| 70 | /** | ||
| 71 | * The <code>Connection</code> object that this writer will use to make a | ||
| 72 | * connection to the data source to which it will write data. | ||
| 73 | * | ||
| 74 | */ | ||
| 75 | private transient Connection con; | ||
| 76 | |||
| 77 | /** | ||
| 78 | * The SQL <code>SELECT</code> command that this writer will call | ||
| 79 | * internally. The method <code>initSQLStatements</code> builds this | ||
| 80 | * command by supplying the words "SELECT" and "FROM," and using | ||
| 81 | * metadata to get the table name and column names . | ||
| 82 | * | ||
| 83 | * @serial | ||
| 84 | */ | ||
| 85 | private String selectCmd; | ||
| 86 | |||
| 87 | /** | ||
| 88 | * The SQL <code>UPDATE</code> command that this writer will call | ||
| 89 | * internally to write data to the rowset's underlying data source. | ||
| 90 | * The method <code>initSQLStatements</code> builds this <code>String</code> | ||
| 91 | * object. | ||
| 92 | * | ||
| 93 | * @serial | ||
| 94 | */ | ||
| 95 | private String updateCmd; | ||
| 96 | |||
| 97 | /** | ||
| 98 | * The SQL <code>WHERE</code> clause the writer will use for update | ||
| 99 | * statements in the <code>PreparedStatement</code> object | ||
| 100 | * it sends to the underlying data source. | ||
| 101 | * | ||
| 102 | * @serial | ||
| 103 | */ | ||
| 104 | private String updateWhere; | ||
| 105 | |||
| 106 | /** | ||
| 107 | * The SQL <code>DELETE</code> command that this writer will call | ||
| 108 | * internally to delete a row in the rowset's underlying data source. | ||
| 109 | * | ||
| 110 | * @serial | ||
| 111 | */ | ||
| 112 | private String deleteCmd; | ||
| 113 | |||
| 114 | /** | ||
| 115 | * The SQL <code>WHERE</code> clause the writer will use for delete | ||
| 116 | * statements in the <code>PreparedStatement</code> object | ||
| 117 | * it sends to the underlying data source. | ||
| 118 | * | ||
| 119 | * @serial | ||
| 120 | */ | ||
| 121 | private String deleteWhere; | ||
| 122 | |||
| 123 | /** | ||
| 124 | * The SQL <code>INSERT INTO</code> command that this writer will internally use | ||
| 125 | * to insert data into the rowset's underlying data source. The method | ||
| 126 | * <code>initSQLStatements</code> builds this command with a question | ||
| 127 | * mark parameter placeholder for each column in the rowset. | ||
| 128 | * | ||
| 129 | * @serial | ||
| 130 | */ | ||
| 131 | private String insertCmd; | ||
| 132 | |||
| 133 | /** | ||
| 134 | * An array containing the column numbers of the columns that are | ||
| 135 | * needed to uniquely identify a row in the <code>CachedRowSet</code> object | ||
| 136 | * for which this <code>CachedRowSetWriter</code> object is the writer. | ||
| 137 | * | ||
| 138 | * @serial | ||
| 139 | */ | ||
| 140 | private int[] keyCols; | ||
| 141 | |||
| 142 | /** | ||
| 143 | * An array of the parameters that should be used to set the parameter | ||
| 144 | * placeholders in a <code>PreparedStatement</code> object that this | ||
| 145 | * writer will execute. | ||
| 146 | * | ||
| 147 | * @serial | ||
| 148 | */ | ||
| 149 | private Object[] params; | ||
| 150 | |||
| 151 | /** | ||
| 152 | * The <code>CachedRowSetReader</code> object that has been | ||
| 153 | * set as the reader for the <code>CachedRowSet</code> object | ||
| 154 | * for which this <code>CachedRowSetWriter</code> object is the writer. | ||
| 155 | * | ||
| 156 | * @serial | ||
| 157 | */ | ||
| 158 | private CachedRowSetReader reader; | ||
| 159 | |||
| 160 | /** | ||
| 161 | * The <code>ResultSetMetaData</code> object that contains information | ||
| 162 | * about the columns in the <code>CachedRowSet</code> object | ||
| 163 | * for which this <code>CachedRowSetWriter</code> object is the writer. | ||
| 164 | * | ||
| 165 | * @serial | ||
| 166 | */ | ||
| 167 | private ResultSetMetaData callerMd; | ||
| 168 | |||
| 169 | /** | ||
| 170 | * The number of columns in the <code>CachedRowSet</code> object | ||
| 171 | * for which this <code>CachedRowSetWriter</code> object is the writer. | ||
| 172 | * | ||
| 173 | * @serial | ||
| 174 | */ | ||
| 175 | private int callerColumnCount; | ||
| 176 | |||
| 177 | /** | ||
| 178 | * This <code>CachedRowSet<code> will hold the conflicting values | ||
| 179 | * retrieved from the db and hold it. | ||
| 180 | */ | ||
| 181 | private CachedRowSetImpl crsResolve; | ||
| 182 | |||
| 183 | /** | ||
| 184 | * This <code>ArrayList<code> will hold the values of SyncResolver.* | ||
| 185 | */ | ||
| 186 | private ArrayList status; | ||
| 187 | |||
| 188 | /** | ||
| 189 | * This will check whether the same field value has changed both | ||
| 190 | * in database and CachedRowSet. | ||
| 191 | */ | ||
| 192 | private int iChangedValsInDbAndCRS; | ||
| 193 | |||
| 194 | /** | ||
| 195 | * This will hold the number of cols for which the values have | ||
| 196 | * changed only in database. | ||
| 197 | */ | ||
| 198 | private int iChangedValsinDbOnly ; | ||
| 199 | |||
| 200 | private JdbcRowSetResourceBundle resBundle; | ||
| 201 | |||
| 202 | public CachedRowSetWriter() { | ||
| 203 | try { | ||
| 204 | resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle(); | ||
| 205 | } catch(IOException ioe) { | ||
| 206 | throw new RuntimeException(ioe); | ||
| 207 | } | ||
| 208 | } | ||
| 209 | |||
| 210 | /** | ||
| 211 | * Propagates changes in the given <code>RowSet</code> object | ||
| 212 | * back to its underlying data source and returns <code>true</code> | ||
| 213 | * if successful. The writer will check to see if | ||
| 214 | * the data in the pre-modified rowset (the original values) differ | ||
| 215 | * from the data in the underlying data source. If data in the data | ||
| 216 | * source has been modified by someone else, there is a conflict, | ||
| 217 | * and in that case, the writer will not write to the data source. | ||
| 218 | * In other words, the writer uses an optimistic concurrency algorithm: | ||
| 219 | * It checks for conflicts before making changes rather than restricting | ||
| 220 | * access for concurrent users. | ||
| 221 | * <P> | ||
| 222 | * This method is called by the rowset internally when | ||
| 223 | * the application invokes the method <code>acceptChanges</code>. | ||
| 224 | * The <code>writeData</code> method in turn calls private methods that | ||
| 225 | * it defines internally. | ||
| 226 | * The following is a general summary of what the method | ||
| 227 | * <code>writeData</code> does, much of which is accomplished | ||
| 228 | * through calls to its own internal methods. | ||
| 229 | * <OL> | ||
| 230 | * <LI>Creates a <code>CachedRowSet</code> object from the given | ||
| 231 | * <code>RowSet</code> object | ||
| 232 | * <LI>Makes a connection with the data source | ||
| 233 | * <UL> | ||
| 234 | * <LI>Disables autocommit mode if it is not already disabled | ||
| 235 | * <LI>Sets the transaction isolation level to that of the rowset | ||
| 236 | * </UL> | ||
| 237 | * <LI>Checks to see if the reader has read new data since the writer | ||
| 238 | * was last called and, if so, calls the method | ||
| 239 | * <code>initSQLStatements</code> to initialize new SQL statements | ||
| 240 | * <UL> | ||
| 241 | * <LI>Builds new <code>SELECT</code>, <code>UPDATE</code>, | ||
| 242 | * <code>INSERT</code>, and <code>DELETE</code> statements | ||
| 243 | * <LI>Uses the <code>CachedRowSet</code> object's metadata to | ||
| 244 | * determine the table name, column names, and the columns | ||
| 245 | * that make up the primary key | ||
| 246 | * </UL> | ||
| 247 | * <LI>When there is no conflict, propagates changes made to the | ||
| 248 | * <code>CachedRowSet</code> object back to its underlying data source | ||
| 249 | * <UL> | ||
| 250 | * <LI>Iterates through each row of the <code>CachedRowSet</code> object | ||
| 251 | * to determine whether it has been updated, inserted, or deleted | ||
| 252 | * <LI>If the corresponding row in the data source has not been changed | ||
| 253 | * since the rowset last read its | ||
| 254 | * values, the writer will use the appropriate command to update, | ||
| 255 | * insert, or delete the row | ||
| 256 | * <LI>If any data in the data source does not match the original values | ||
| 257 | * for the <code>CachedRowSet</code> object, the writer will roll | ||
| 258 | * back any changes it has made to the row in the data source. | ||
| 259 | * </UL> | ||
| 260 | * </OL> | ||
| 261 | * | ||
| 262 | * @return <code>true</code> if changes to the rowset were successfully | ||
| 263 | * written to the rowset's underlying data source; | ||
| 264 | * <code>false</code> otherwise | ||
| 265 | */ | ||
| 266 | public boolean writeData(RowSetInternal caller) throws SQLException { | ||
| 267 | boolean conflict = false; | ||
| 268 | boolean showDel = false; | ||
| 269 | PreparedStatement pstmtIns = null; | ||
| 270 | iChangedValsInDbAndCRS = 0; | ||
| 271 | iChangedValsinDbOnly = 0; | ||
| 272 | |||
| 273 | // We assume caller is a CachedRowSet | ||
| 274 | CachedRowSetImpl crs = (CachedRowSetImpl)caller; | ||
| 275 | // crsResolve = new CachedRowSetImpl(); | ||
| 276 | this.crsResolve = new CachedRowSetImpl();; | ||
| 277 | |||
| 278 | // The reader is registered with the writer at design time. | ||
| 279 | // This is not required, in general. The reader has logic | ||
| 280 | // to get a JDBC connection, so call it. | ||
| 281 | |||
| 282 | con = reader.connect(caller); | ||
| 283 | |||
| 284 | |||
| 285 | if (con == null) { | ||
| 286 | throw new SQLException(resBundle.handleGetObject("crswriter.connect").toString()); | ||
| 287 | } | ||
| 288 | |||
| 289 | /* | ||
| 290 | // Fix 6200646. | ||
| 291 | // Don't change the connection or transaction properties. This will fail in a | ||
| 292 | // J2EE container. | ||
| 293 | if (con.getAutoCommit() == true) { | ||
| 294 | con.setAutoCommit(false); | ||
| 295 | } | ||
| 296 | |||
| 297 | con.setTransactionIsolation(crs.getTransactionIsolation()); | ||
| 298 | */ | ||
| 299 | |||
| 300 | initSQLStatements(crs); | ||
| 301 | int iColCount; | ||
| 302 | |||
| 303 | RowSetMetaDataImpl rsmdWrite = (RowSetMetaDataImpl)crs.getMetaData(); | ||
| 304 | RowSetMetaDataImpl rsmdResolv = new RowSetMetaDataImpl(); | ||
| 305 | |||
| 306 | iColCount = rsmdWrite.getColumnCount(); | ||
| 307 | int sz= crs.size()+1; | ||
| 308 | status = new ArrayList(sz); | ||
| 309 | |||
| 310 | status.add(0,null); | ||
| 311 | rsmdResolv.setColumnCount(iColCount); | ||
| 312 | |||
| 313 | for(int i =1; i <= iColCount; i++) { | ||
| 314 | rsmdResolv.setColumnType(i, rsmdWrite.getColumnType(i)); | ||
| 315 | rsmdResolv.setColumnName(i, rsmdWrite.getColumnName(i)); | ||
| 316 | rsmdResolv.setNullable(i, ResultSetMetaData.columnNullableUnknown); | ||
| 317 | } | ||
| 318 | this.crsResolve.setMetaData(rsmdResolv); | ||
| 319 | |||
| 320 | // moved outside the insert inner loop | ||
| 321 | //pstmtIns = con.prepareStatement(insertCmd); | ||
| 322 | |||
| 323 | if (callerColumnCount < 1) { | ||
| 324 | // No data, so return success. | ||
| 325 | if (reader.getCloseConnection() == true) | ||
| 326 | con.close(); | ||
| 327 | return true; | ||
| 328 | } | ||
| 329 | // We need to see rows marked for deletion. | ||
| 330 | showDel = crs.getShowDeleted(); | ||
| 331 | crs.setShowDeleted(true); | ||
| 332 | |||
| 333 | // Look at all the rows. | ||
| 334 | crs.beforeFirst(); | ||
| 335 | |||
| 336 | int rows =1; | ||
| 337 | while (crs.next()) { | ||
| 338 | if (crs.rowDeleted()) { | ||
| 339 | // The row has been deleted. | ||
| 340 | if (conflict = (deleteOriginalRow(crs, this.crsResolve)) == true) { | ||
| 341 | status.add(rows, Integer.valueOf(SyncResolver.DELETE_ROW_CONFLICT)); | ||
| 342 | } else { | ||
| 343 | // delete happened without any occurrence of conflicts | ||
| 344 | // so update status accordingly | ||
| 345 | status.add(rows, Integer.valueOf(SyncResolver.NO_ROW_CONFLICT)); | ||
| 346 | } | ||
| 347 | |||
| 348 | } else if (crs.rowInserted()) { | ||
| 349 | // The row has been inserted. | ||
| 350 | |||
| 351 | pstmtIns = con.prepareStatement(insertCmd); | ||
| 352 | if ( (conflict = insertNewRow(crs, pstmtIns, this.crsResolve)) == true) { | ||
| 353 | status.add(rows, Integer.valueOf(SyncResolver.INSERT_ROW_CONFLICT)); | ||
| 354 | } else { | ||
| 355 | // insert happened without any occurrence of conflicts | ||
| 356 | // so update status accordingly | ||
| 357 | status.add(rows, Integer.valueOf(SyncResolver.NO_ROW_CONFLICT)); | ||
| 358 | } | ||
| 359 | } else if (crs.rowUpdated()) { | ||
| 360 | // The row has been updated. | ||
| 361 | if ( conflict = (updateOriginalRow(crs)) == true) { | ||
| 362 | status.add(rows, Integer.valueOf(SyncResolver.UPDATE_ROW_CONFLICT)); | ||
| 363 | } else { | ||
| 364 | // update happened without any occurrence of conflicts | ||
| 365 | // so update status accordingly | ||
| 366 | status.add(rows, Integer.valueOf(SyncResolver.NO_ROW_CONFLICT)); | ||
| 367 | } | ||
| 368 | |||
| 369 | } else { | ||
| 370 | /** The row is neither of inserted, updated or deleted. | ||
| 371 | * So set nulls in the this.crsResolve for this row, | ||
| 372 | * as nothing is to be done for such rows. | ||
| 373 | * Also note that if such a row has been changed in database | ||
| 374 | * and we have not changed(inserted, updated or deleted) | ||
| 375 | * that is fine. | ||
| 376 | **/ | ||
| 377 | int icolCount = crs.getMetaData().getColumnCount(); | ||
| 378 | status.add(rows, Integer.valueOf(SyncResolver.NO_ROW_CONFLICT)); | ||
| 379 | |||
| 380 | this.crsResolve.moveToInsertRow(); | ||
| 381 | for(int cols=0;cols<iColCount;cols++) { | ||
| 382 | this.crsResolve.updateNull(cols+1); | ||
| 383 | } //end for | ||
| 384 | |||
| 385 | this.crsResolve.insertRow(); | ||
| 386 | this.crsResolve.moveToCurrentRow(); | ||
| 387 | |||
| 388 | } //end if | ||
| 389 | rows++; | ||
| 390 | } //end while | ||
| 391 | |||
| 392 | // close the insert statement | ||
| 393 | if(pstmtIns!=null) | ||
| 394 | pstmtIns.close(); | ||
| 395 | // reset | ||
| 396 | crs.setShowDeleted(showDel); | ||
| 397 | |||
| 398 | boolean boolConf = false; | ||
| 399 | for (int j=1;j<status.size();j++){ | ||
| 400 | // ignore status for index = 0 which is set to null | ||
| 401 | if(! ((status.get(j)).equals(Integer.valueOf(SyncResolver.NO_ROW_CONFLICT)))) { | ||
| 402 | // there is at least one conflict which needs to be resolved | ||
| 403 | boolConf = true; | ||
| 404 | break; | ||
| 405 | } | ||
| 406 | } | ||
| 407 | |||
| 408 | crs.beforeFirst(); | ||
| 409 | this.crsResolve.beforeFirst(); | ||
| 410 | |||
| 411 | if(boolConf) { | ||
| 412 | SyncProviderException spe = new SyncProviderException(status.size() - 1+resBundle.handleGetObject("crswriter.conflictsno").toString()); | ||
| 413 | //SyncResolver syncRes = spe.getSyncResolver(); | ||
| 414 | |||
| 415 | SyncResolverImpl syncResImpl = (SyncResolverImpl) spe.getSyncResolver(); | ||
| 416 | |||
| 417 | syncResImpl.setCachedRowSet(crs); | ||
| 418 | syncResImpl.setCachedRowSetResolver(this.crsResolve); | ||
| 419 | |||
| 420 | syncResImpl.setStatus(status); | ||
| 421 | syncResImpl.setCachedRowSetWriter(this); | ||
| 422 | |||
| 423 | throw spe; | ||
| 424 | } else { | ||
| 425 | return true; | ||
| 426 | } | ||
| 427 | /* | ||
| 428 | if (conflict == true) { | ||
| 429 | con.rollback(); | ||
| 430 | return false; | ||
| 431 | } else { | ||
| 432 | con.commit(); | ||
| 433 | if (reader.getCloseConnection() == true) { | ||
| 434 | con.close(); | ||
| 435 | } | ||
| 436 | return true; | ||
| 437 | } | ||
| 438 | */ | ||
| 439 | |||
| 440 | } //end writeData | ||
| 441 | |||
| 442 | /** | ||
| 443 | * Updates the given <code>CachedRowSet</code> object's underlying data | ||
| 444 | * source so that updates to the rowset are reflected in the original | ||
| 445 | * data source, and returns <code>false</code> if the update was successful. | ||
| 446 | * A return value of <code>true</code> indicates that there is a conflict, | ||
| 447 | * meaning that a value updated in the rowset has already been changed by | ||
| 448 | * someone else in the underlying data source. A conflict can also exist | ||
| 449 | * if, for example, more than one row in the data source would be affected | ||
| 450 | * by the update or if no rows would be affected. In any case, if there is | ||
| 451 | * a conflict, this method does not update the underlying data source. | ||
| 452 | * <P> | ||
| 453 | * This method is called internally by the method <code>writeData</code> | ||
| 454 | * if a row in the <code>CachedRowSet</code> object for which this | ||
| 455 | * <code>CachedRowSetWriter</code> object is the writer has been updated. | ||
| 456 | * | ||
| 457 | * @return <code>false</code> if the update to the underlying data source is | ||
| 458 | * successful; <code>true</code> otherwise | ||
| 459 | * @throws SQLException if a database access error occurs | ||
| 460 | */ | ||
| 461 | private boolean updateOriginalRow(CachedRowSet crs) | ||
| 462 | throws SQLException { | ||
| 463 | PreparedStatement pstmt; | ||
| 464 | int i = 0; | ||
| 465 | int idx = 0; | ||
| 466 | |||
| 467 | // Select the row from the database. | ||
| 468 | ResultSet origVals = crs.getOriginalRow(); | ||
| 469 | origVals.next(); | ||
| 470 | |||
| 471 | try { | ||
| 472 | updateWhere = buildWhereClause(updateWhere, origVals); | ||
| 473 | |||
| 474 | |||
| 475 | /** | ||
| 476 | * The following block of code is for checking a particular type of | ||
| 477 | * query where in there is a where clause. Without this block, if a | ||
| 478 | * SQL statement is built the "where" clause will appear twice hence | ||
| 479 | * the DB errors out and a SQLException is thrown. This code also | ||
| 480 | * considers that the where clause is in the right place as the | ||
| 481 | * CachedRowSet object would already have been populated with this | ||
| 482 | * query before coming to this point. | ||
| 483 | **/ | ||
| 484 | |||
| 485 | |||
| 486 | String tempselectCmd = selectCmd.toLowerCase(); | ||
| 487 | |||
| 488 | int idxWhere = tempselectCmd.indexOf("where"); | ||
| 489 | |||
| 490 | if(idxWhere != -1) | ||
| 491 | { | ||
| 492 | String tempSelect = selectCmd.substring(0,idxWhere); | ||
| 493 | selectCmd = tempSelect; | ||
| 494 | } | ||
| 495 | |||
| 496 | pstmt = con.prepareStatement(selectCmd + updateWhere, | ||
| 497 | ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY); | ||
| 498 | |||
| 499 | for (i = 0; i < keyCols.length; i++) { | ||
| 500 | if (params[i] != null) { | ||
| 501 | pstmt.setObject(++idx, params[i]); | ||
| 502 | } else { | ||
| 503 | continue; | ||
| 504 | } | ||
| 505 | } | ||
| 506 | |||
| 507 | try { | ||
| 508 | pstmt.setMaxRows(crs.getMaxRows()); | ||
| 509 | pstmt.setMaxFieldSize(crs.getMaxFieldSize()); | ||
| 510 | pstmt.setEscapeProcessing(crs.getEscapeProcessing()); | ||
| 511 | pstmt.setQueryTimeout(crs.getQueryTimeout()); | ||
| 512 | } catch (Exception ex) { | ||
| 513 | // Older driver don't support these operations. | ||
| 514 | } | ||
| 515 | |||
| 516 | ResultSet rs = null; | ||
| 517 | rs = pstmt.executeQuery(); | ||
| 518 | ResultSetMetaData rsmd = rs.getMetaData(); | ||
| 519 | |||
| 520 | if (rs.next()) { | ||
| 521 | if (rs.next()) { | ||
| 522 | /** More than one row conflict. | ||
| 523 | * If rs has only one row we are able to | ||
| 524 | * uniquely identify the row where update | ||
| 525 | * have to happen else if more than one | ||
| 526 | * row implies we cannot uniquely identify the row | ||
| 527 | * where we have to do updates. | ||
| 528 | * crs.setKeyColumns needs to be set to | ||
| 529 | * come out of this situation. | ||
| 530 | */ | ||
| 531 | |||
| 532 | return true; | ||
| 533 | } | ||
| 534 | |||
| 535 | // don't close the rs | ||
| 536 | // we require the record in rs to be used. | ||
| 537 | // rs.close(); | ||
| 538 | // pstmt.close(); | ||
| 539 | rs.first(); | ||
| 540 | |||
| 541 | // how many fields need to be updated | ||
| 542 | int colsNotChanged = 0; | ||
| 543 | Vector cols = new Vector(); | ||
| 544 | String updateExec = updateCmd; | ||
| 545 | Object orig; | ||
| 546 | Object curr; | ||
| 547 | Object rsval; | ||
| 548 | boolean boolNull = true; | ||
| 549 | Object objVal = null; | ||
| 550 | |||
| 551 | // There's only one row and the cursor | ||
| 552 | // needs to be on that row. | ||
| 553 | |||
| 554 | boolean first = true; | ||
| 555 | boolean flag = true; | ||
| 556 | |||
| 557 | this.crsResolve.moveToInsertRow(); | ||
| 558 | |||
| 559 | for (i = 1; i <= callerColumnCount; i++) { | ||
| 560 | orig = origVals.getObject(i); | ||
| 561 | curr = crs.getObject(i); | ||
| 562 | rsval = rs.getObject(i); | ||
| 563 | /* | ||
| 564 | * the following block creates equivalent objects | ||
| 565 | * that would have been created if this rs is populated | ||
| 566 | * into a CachedRowSet so that comparison of the column values | ||
| 567 | * from the ResultSet and CachedRowSet are possible | ||
| 568 | */ | ||
| 569 | Map map = (crs.getTypeMap() == null)?con.getTypeMap():crs.getTypeMap(); | ||
| 570 | if (rsval instanceof Struct) { | ||
| 571 | |||
| 572 | Struct s = (Struct)rsval; | ||
| 573 | |||
| 574 | // look up the class in the map | ||
| 575 | Class c = null; | ||
| 576 | c = (Class)map.get(s.getSQLTypeName()); | ||
| 577 | if (c != null) { | ||
| 578 | // create new instance of the class | ||
| 579 | SQLData obj = null; | ||
| 580 | try { | ||
| 581 | obj = (SQLData)c.newInstance(); | ||
| 582 | } catch (java.lang.InstantiationException ex) { | ||
| 583 | throw new SQLException(MessageFormat.format(resBundle.handleGetObject("cachedrowsetimpl.unableins").toString(), | ||
| 584 | ex.getMessage())); | ||
| 585 | } catch (java.lang.IllegalAccessException ex) { | ||
| 586 | throw new SQLException(MessageFormat.format(resBundle.handleGetObject("cachedrowsetimpl.unableins").toString(), | ||
| 587 | ex.getMessage())); | ||
| 588 | } | ||
| 589 | // get the attributes from the struct | ||
| 590 | Object attribs[] = s.getAttributes(map); | ||
| 591 | // create the SQLInput "stream" | ||
| 592 | SQLInputImpl sqlInput = new SQLInputImpl(attribs, map); | ||
| 593 | // read the values... | ||
| 594 | obj.readSQL(sqlInput, s.getSQLTypeName()); | ||
| 595 | rsval = obj; | ||
| 596 | } | ||
| 597 | } else if (rsval instanceof SQLData) { | ||
| 598 | rsval = new SerialStruct((SQLData)rsval, map); | ||
| 599 | } else if (rsval instanceof Blob) { | ||
| 600 | rsval = new SerialBlob((Blob)rsval); | ||
| 601 | } else if (rsval instanceof Clob) { | ||
| 602 | rsval = new SerialClob((Clob)rsval); | ||
| 603 | } else if (rsval instanceof java.sql.Array) { | ||
| 604 | rsval = new SerialArray((java.sql.Array)rsval, map); | ||
| 605 | } | ||
| 606 | |||
| 607 | // reset boolNull if it had been set | ||
| 608 | boolNull = true; | ||
| 609 | |||
| 610 | /** This addtional checking has been added when the current value | ||
| 611 | * in the DB is null, but the DB had a different value when the | ||
| 612 | * data was actaully fetched into the CachedRowSet. | ||
| 613 | **/ | ||
| 614 | |||
| 615 | if(rsval == null && orig != null) { | ||
| 616 | // value in db has changed | ||
| 617 | // don't proceed with synchronization | ||
| 618 | // get the value in db and pass it to the resolver. | ||
| 619 | |||
| 620 | iChangedValsinDbOnly++; | ||
| 621 | // Set the boolNull to false, | ||
| 622 | // in order to set the actual value; | ||
| 623 | boolNull = false; | ||
| 624 | objVal = rsval; | ||
| 625 | } | ||
| 626 | |||
| 627 | /** Adding the checking for rsval to be "not" null or else | ||
| 628 | * it would through a NullPointerException when the values | ||
| 629 | * are compared. | ||
| 630 | **/ | ||
| 631 | |||
| 632 | else if(rsval != null && (!rsval.equals(orig))) | ||
| 633 | { | ||
| 634 | // value in db has changed | ||
| 635 | // don't proceed with synchronization | ||
| 636 | // get the value in db and pass it to the resolver. | ||
| 637 | |||
| 638 | iChangedValsinDbOnly++; | ||
| 639 | // Set the boolNull to false, | ||
| 640 | // in order to set the actual value; | ||
| 641 | boolNull = false; | ||
| 642 | objVal = rsval; | ||
| 643 | } else if ( (orig == null || curr == null) ) { | ||
| 644 | |||
| 645 | /** Adding the additonal condition of checking for "flag" | ||
| 646 | * boolean variable, which would otherwise result in | ||
| 647 | * building a invalid query, as the comma would not be | ||
| 648 | * added to the query string. | ||
| 649 | **/ | ||
| 650 | |||
| 651 | if (first == false || flag == false) { | ||
| 652 | updateExec += ", "; | ||
| 653 | } | ||
| 654 | updateExec += crs.getMetaData().getColumnName(i); | ||
| 655 | cols.add(Integer.valueOf(i)); | ||
| 656 | updateExec += " = ? "; | ||
| 657 | first = false; | ||
| 658 | |||
| 659 | /** Adding the extra condition for orig to be "not" null as the | ||
| 660 | * condition for orig to be null is take prior to this, if this | ||
| 661 | * is not added it will result in a NullPointerException when | ||
| 662 | * the values are compared. | ||
| 663 | **/ | ||
| 664 | |||
| 665 | } else if (orig.equals(curr)) { | ||
| 666 | colsNotChanged++; | ||
| 667 | //nothing to update in this case since values are equal | ||
| 668 | |||
| 669 | /** Adding the extra condition for orig to be "not" null as the | ||
| 670 | * condition for orig to be null is take prior to this, if this | ||
| 671 | * is not added it will result in a NullPointerException when | ||
| 672 | * the values are compared. | ||
| 673 | **/ | ||
| 674 | |||
| 675 | } else if(orig.equals(curr) == false) { | ||
| 676 | // When values from db and values in CachedRowSet are not equal, | ||
| 677 | // if db value is same as before updation for each col in | ||
| 678 | // the row before fetching into CachedRowSet, | ||
| 679 | // only then we go ahead with updation, else we | ||
| 680 | // throw SyncProviderException. | ||
| 681 | |||
| 682 | // if value has changed in db after fetching from db | ||
| 683 | // for some cols of the row and at the same time, some other cols | ||
| 684 | // have changed in CachedRowSet, no synchronization happens | ||
| 685 | |||
| 686 | // Synchronization happens only when data when fetching is | ||
| 687 | // same or at most has changed in cachedrowset | ||
| 688 | |||
| 689 | // check orig value with what is there in crs for a column | ||
| 690 | // before updation in crs. | ||
| 691 | |||
| 692 | if(crs.columnUpdated(i)) { | ||
| 693 | if(rsval.equals(orig)) { | ||
| 694 | // At this point we are sure that | ||
| 695 | // the value updated in crs was from | ||
| 696 | // what is in db now and has not changed | ||
| 697 | if (flag == false || first == false) { | ||
| 698 | updateExec += ", "; | ||
| 699 | } | ||
| 700 | updateExec += crs.getMetaData().getColumnName(i); | ||
| 701 | cols.add(Integer.valueOf(i)); | ||
| 702 | updateExec += " = ? "; | ||
| 703 | flag = false; | ||
| 704 | } else { | ||
| 705 | // Here the value has changed in the db after | ||
| 706 | // data was fetched | ||
| 707 | // Plus store this row from CachedRowSet and keep it | ||
| 708 | // in a new CachedRowSet | ||
| 709 | boolNull= false; | ||
| 710 | objVal = rsval; | ||
| 711 | iChangedValsInDbAndCRS++; | ||
| 712 | } | ||
| 713 | } | ||
| 714 | } | ||
| 715 | |||
| 716 | if(!boolNull) { | ||
| 717 | this.crsResolve.updateObject(i,objVal); | ||
| 718 | } else { | ||
| 719 | this.crsResolve.updateNull(i); | ||
| 720 | } | ||
| 721 | } //end for | ||
| 722 | |||
| 723 | rs.close(); | ||
| 724 | pstmt.close(); | ||
| 725 | |||
| 726 | this.crsResolve.insertRow(); | ||
| 727 | this.crsResolve.moveToCurrentRow(); | ||
| 728 | |||
| 729 | /** | ||
| 730 | * if nothing has changed return now - this can happen | ||
| 731 | * if column is updated to the same value. | ||
| 732 | * if colsNotChanged == callerColumnCount implies we are updating | ||
| 733 | * the database with ALL COLUMNS HAVING SAME VALUES, | ||
| 734 | * so skip going to database, else do as usual. | ||
| 735 | **/ | ||
| 736 | if ( (first == false && cols.size() == 0) || | ||
| 737 | colsNotChanged == callerColumnCount ) { | ||
| 738 | return false; | ||
| 739 | } | ||
| 740 | |||
| 741 | if(iChangedValsInDbAndCRS != 0 || iChangedValsinDbOnly != 0) { | ||
| 742 | return true; | ||
| 743 | } | ||
| 744 | |||
| 745 | |||
| 746 | updateExec += updateWhere; | ||
| 747 | |||
| 748 | pstmt = con.prepareStatement(updateExec); | ||
| 749 | |||
| 750 | // Comments needed here | ||
| 751 | for (i = 0; i < cols.size(); i++) { | ||
| 752 | Object obj = crs.getObject(((Integer)cols.get(i)).intValue()); | ||
| 753 | if (obj != null) | ||
| 754 | pstmt.setObject(i + 1, obj); | ||
| 755 | else | ||
| 756 | pstmt.setNull(i + 1,crs.getMetaData().getColumnType(i + 1)); | ||
| 757 | } | ||
| 758 | idx = i; | ||
| 759 | |||
| 760 | // Comments needed here | ||
| 761 | for (i = 0; i < keyCols.length; i++) { | ||
| 762 | if (params[i] != null) { | ||
| 763 | pstmt.setObject(++idx, params[i]); | ||
| 764 | } else { | ||
| 765 | continue; | ||
| 766 | } | ||
| 767 | } | ||
| 768 | |||
| 769 | i = pstmt.executeUpdate(); | ||
| 770 | |||
| 771 | /** | ||
| 772 | * i should be equal to 1(row count), because we update | ||
| 773 | * one row(returned as row count) at a time, if all goes well. | ||
| 774 | * if 1 != 1, this implies we have not been able to | ||
| 775 | * do updations properly i.e there is a conflict in database | ||
| 776 | * versus what is in CachedRowSet for this particular row. | ||
| 777 | **/ | ||
| 778 | |||
| 779 | return false; | ||
| 780 | |||
| 781 | } else { | ||
| 782 | /** | ||
| 783 | * Cursor will be here, if the ResultSet may not return even a single row | ||
| 784 | * i.e. we can't find the row where to update because it has been deleted | ||
| 785 | * etc. from the db. | ||
| 786 | * Present the whole row as null to user, to force null to be sync'ed | ||
| 787 | * and hence nothing to be synced. | ||
| 788 | * | ||
| 789 | * NOTE: | ||
| 790 | * ------ | ||
| 791 | * In the database if a column that is mapped to java.sql.Types.REAL stores | ||
| 792 | * a Double value and is compared with value got from ResultSet.getFloat() | ||
| 793 | * no row is retrieved and will throw a SyncProviderException. For details | ||
| 794 | * see bug Id 5053830 | ||
| 795 | **/ | ||
| 796 | return true; | ||
| 797 | } | ||
| 798 | } catch (SQLException ex) { | ||
| 799 | ex.printStackTrace(); | ||
| 800 | // if executeUpdate fails it will come here, | ||
| 801 | // update crsResolve with null rows | ||
| 802 | this.crsResolve.moveToInsertRow(); | ||
| 803 | |||
| 804 | for(i = 1; i <= callerColumnCount; i++) { | ||
| 805 | this.crsResolve.updateNull(i); | ||
| 806 | } | ||
| 807 | |||
| 808 | this.crsResolve.insertRow(); | ||
| 809 | this.crsResolve.moveToCurrentRow(); | ||
| 810 | |||
| 811 | return true; | ||
| 812 | } | ||
| 813 | } | ||
| 814 | |||
| 815 | /** | ||
| 816 | * Inserts a row that has been inserted into the given | ||
| 817 | * <code>CachedRowSet</code> object into the data source from which | ||
| 818 | * the rowset is derived, returning <code>false</code> if the insertion | ||
| 819 | * was successful. | ||
| 820 | * | ||
| 821 | * @param crs the <code>CachedRowSet</code> object that has had a row inserted | ||
| 822 | * and to whose underlying data source the row will be inserted | ||
| 823 | * @param pstmt the <code>PreparedStatement</code> object that will be used | ||
| 824 | * to execute the insertion | ||
| 825 | * @return <code>false</code> to indicate that the insertion was successful; | ||
| 826 | * <code>true</code> otherwise | ||
| 827 | * @throws SQLException if a database access error occurs | ||
| 828 | */ | ||
| 829 | private boolean insertNewRow(CachedRowSet crs, | ||
| 830 | PreparedStatement pstmt, CachedRowSetImpl crsRes) throws SQLException { | ||
| 831 | int i = 0; | ||
| 832 | int icolCount = crs.getMetaData().getColumnCount(); | ||
| 833 | |||
| 834 | boolean returnVal = false; | ||
| 835 | PreparedStatement pstmtSel = con.prepareStatement(selectCmd, | ||
| 836 | ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY); | ||
| 837 | ResultSet rs, rs2 = null; | ||
| 838 | DatabaseMetaData dbmd = con.getMetaData(); | ||
| 839 | rs = pstmtSel.executeQuery(); | ||
| 840 | String table = crs.getTableName(); | ||
| 841 | rs2 = dbmd.getPrimaryKeys(null, null, table); | ||
| 842 | String [] primaryKeys = new String[icolCount]; | ||
| 843 | int k = 0; | ||
| 844 | while(rs2.next()) { | ||
| 845 | String pkcolname = rs2.getString("COLUMN_NAME"); | ||
| 846 | primaryKeys[k] = pkcolname; | ||
| 847 | k++; | ||
| 848 | } | ||
| 849 | |||
| 850 | if(rs.next()) { | ||
| 851 | for(int j=0;j<primaryKeys.length;j++) { | ||
| 852 | if(primaryKeys[j] != null) { | ||
| 853 | if(crs.getObject(primaryKeys[j]) == null){ | ||
| 854 | break; | ||
| 855 | } | ||
| 856 | String crsPK = (crs.getObject(primaryKeys[j])).toString(); | ||
| 857 | String rsPK = (rs.getObject(primaryKeys[j])).toString(); | ||
| 858 | if(crsPK.equals(rsPK)) { | ||
| 859 | returnVal = true; | ||
| 860 | this.crsResolve.moveToInsertRow(); | ||
| 861 | for(i = 1; i <= icolCount; i++) { | ||
| 862 | String colname = (rs.getMetaData()).getColumnName(i); | ||
| 863 | if(colname.equals(primaryKeys[j])) | ||
| 864 | this.crsResolve.updateObject(i,rsPK); | ||
| 865 | else | ||
| 866 | this.crsResolve.updateNull(i); | ||
| 867 | } | ||
| 868 | this.crsResolve.insertRow(); | ||
| 869 | this.crsResolve.moveToCurrentRow(); | ||
| 870 | } | ||
| 871 | } | ||
| 872 | } | ||
| 873 | } | ||
| 874 | if(returnVal) | ||
| 875 | return returnVal; | ||
| 876 | |||
| 877 | try { | ||
| 878 | for (i = 1; i <= icolCount; i++) { | ||
| 879 | Object obj = crs.getObject(i); | ||
| 880 | if (obj != null) { | ||
| 881 | pstmt.setObject(i, obj); | ||
| 882 | } else { | ||
| 883 | pstmt.setNull(i,crs.getMetaData().getColumnType(i)); | ||
| 884 | } | ||
| 885 | } | ||
| 886 | |||
| 887 | i = pstmt.executeUpdate(); | ||
| 888 | return false; | ||
| 889 | |||
| 890 | } catch (SQLException ex) { | ||
| 891 | /** | ||
| 892 | * Cursor will come here if executeUpdate fails. | ||
| 893 | * There can be many reasons why the insertion failed, | ||
| 894 | * one can be violation of primary key. | ||
| 895 | * Hence we cannot exactly identify why the insertion failed | ||
| 896 | * Present the current row as a null row to the user. | ||
| 897 | **/ | ||
| 898 | this.crsResolve.moveToInsertRow(); | ||
| 899 | |||
| 900 | for(i = 1; i <= icolCount; i++) { | ||
| 901 | this.crsResolve.updateNull(i); | ||
| 902 | } | ||
| 903 | |||
| 904 | this.crsResolve.insertRow(); | ||
| 905 | this.crsResolve.moveToCurrentRow(); | ||
| 906 | |||
| 907 | return true; | ||
| 908 | } | ||
| 909 | } | ||
| 910 | |||
| 911 | /** | ||
| 912 | * Deletes the row in the underlying data source that corresponds to | ||
| 913 | * a row that has been deleted in the given <code> CachedRowSet</code> object | ||
| 914 | * and returns <code>false</code> if the deletion was successful. | ||
| 915 | * <P> | ||
| 916 | * This method is called internally by this writer's <code>writeData</code> | ||
| 917 | * method when a row in the rowset has been deleted. The values in the | ||
| 918 | * deleted row are the same as those that are stored in the original row | ||
| 919 | * of the given <code>CachedRowSet</code> object. If the values in the | ||
| 920 | * original row differ from the row in the underlying data source, the row | ||
| 921 | * in the data source is not deleted, and <code>deleteOriginalRow</code> | ||
| 922 | * returns <code>true</code> to indicate that there was a conflict. | ||
| 923 | * | ||
| 924 | * | ||
| 925 | * @return <code>false</code> if the deletion was successful, which means that | ||
| 926 | * there was no conflict; <code>true</code> otherwise | ||
| 927 | * @throws SQLException if there was a database access error | ||
| 928 | */ | ||
| 929 | private boolean deleteOriginalRow(CachedRowSet crs, CachedRowSetImpl crsRes) throws SQLException { | ||
| 930 | PreparedStatement pstmt; | ||
| 931 | int i; | ||
| 932 | int idx = 0; | ||
| 933 | String strSelect; | ||
| 934 | // Select the row from the database. | ||
| 935 | ResultSet origVals = crs.getOriginalRow(); | ||
| 936 | origVals.next(); | ||
| 937 | |||
| 938 | deleteWhere = buildWhereClause(deleteWhere, origVals); | ||
| 939 | pstmt = con.prepareStatement(selectCmd + deleteWhere, | ||
| 940 | ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY); | ||
| 941 | |||
| 942 | for (i = 0; i < keyCols.length; i++) { | ||
| 943 | if (params[i] != null) { | ||
| 944 | pstmt.setObject(++idx, params[i]); | ||
| 945 | } else { | ||
| 946 | continue; | ||
| 947 | } | ||
| 948 | } | ||
| 949 | |||
| 950 | try { | ||
| 951 | pstmt.setMaxRows(crs.getMaxRows()); | ||
| 952 | pstmt.setMaxFieldSize(crs.getMaxFieldSize()); | ||
| 953 | pstmt.setEscapeProcessing(crs.getEscapeProcessing()); | ||
| 954 | pstmt.setQueryTimeout(crs.getQueryTimeout()); | ||
| 955 | } catch (Exception ex) { | ||
| 956 | /* | ||
| 957 | * Older driver don't support these operations... | ||
| 958 | */ | ||
| 959 | ; | ||
| 960 | } | ||
| 961 | |||
| 962 | ResultSet rs = pstmt.executeQuery(); | ||
| 963 | |||
| 964 | if (rs.next() == true) { | ||
| 965 | if (rs.next()) { | ||
| 966 | // more than one row | ||
| 967 | return true; | ||
| 968 | } | ||
| 969 | rs.first(); | ||
| 970 | |||
| 971 | // Now check all the values in rs to be same in | ||
| 972 | // db also before actually going ahead with deleting | ||
| 973 | boolean boolChanged = false; | ||
| 974 | |||
| 975 | crsRes.moveToInsertRow(); | ||
| 976 | |||
| 977 | for (i = 1; i <= crs.getMetaData().getColumnCount(); i++) { | ||
| 978 | |||
| 979 | Object original = origVals.getObject(i); | ||
| 980 | Object changed = rs.getObject(i); | ||
| 981 | |||
| 982 | if(original != null && changed != null ) { | ||
| 983 | if(! (original.toString()).equals(changed.toString()) ) { | ||
| 984 | boolChanged = true; | ||
| 985 | crsRes.updateObject(i,origVals.getObject(i)); | ||
| 986 | } | ||
| 987 | } else { | ||
| 988 | crsRes.updateNull(i); | ||
| 989 | } | ||
| 990 | } | ||
| 991 | |||
| 992 | crsRes.insertRow(); | ||
| 993 | crsRes.moveToCurrentRow(); | ||
| 994 | |||
| 995 | if(boolChanged) { | ||
| 996 | // do not delete as values in db have changed | ||
| 997 | // deletion will not happen for this row from db | ||
| 998 | // exit now returning true. i.e. conflict | ||
| 999 | return true; | ||
| 1000 | } else { | ||
| 1001 | // delete the row. | ||
| 1002 | // Go ahead with deleting, | ||
| 1003 | // don't do anything here | ||
| 1004 | } | ||
| 1005 | |||
| 1006 | String cmd = deleteCmd + deleteWhere; | ||
| 1007 | pstmt = con.prepareStatement(cmd); | ||
| 1008 | |||
| 1009 | idx = 0; | ||
| 1010 | for (i = 0; i < keyCols.length; i++) { | ||
| 1011 | if (params[i] != null) { | ||
| 1012 | pstmt.setObject(++idx, params[i]); | ||
| 1013 | } else { | ||
| 1014 | continue; | ||
| 1015 | } | ||
| 1016 | } | ||
| 1017 | |||
| 1018 | if (pstmt.executeUpdate() != 1) { | ||
| 1019 | return true; | ||
| 1020 | } | ||
| 1021 | pstmt.close(); | ||
| 1022 | } else { | ||
| 1023 | // didn't find the row | ||
| 1024 | return true; | ||
| 1025 | } | ||
| 1026 | |||
| 1027 | // no conflict | ||
| 1028 | return false; | ||
| 1029 | } | ||
| 1030 | |||
| 1031 | /** | ||
| 1032 | * Sets the reader for this writer to the given reader. | ||
| 1033 | * | ||
| 1034 | * @throws SQLException if a database access error occurs | ||
| 1035 | */ | ||
| 1036 | public void setReader(CachedRowSetReader reader) throws SQLException { | ||
| 1037 | this.reader = reader; | ||
| 1038 | } | ||
| 1039 | |||
| 1040 | /** | ||
| 1041 | * Gets the reader for this writer. | ||
| 1042 | * | ||
| 1043 | * @throws SQLException if a database access error occurs | ||
| 1044 | */ | ||
| 1045 | public CachedRowSetReader getReader() throws SQLException { | ||
| 1046 | return reader; | ||
| 1047 | } | ||
| 1048 | |||
| 1049 | /** | ||
| 1050 | * Composes a <code>SELECT</code>, <code>UPDATE</code>, <code>INSERT</code>, | ||
| 1051 | * and <code>DELETE</code> statement that can be used by this writer to | ||
| 1052 | * write data to the data source backing the given <code>CachedRowSet</code> | ||
| 1053 | * object. | ||
| 1054 | * | ||
| 1055 | * @ param caller a <code>CachedRowSet</code> object for which this | ||
| 1056 | * <code>CachedRowSetWriter</code> object is the writer | ||
| 1057 | * @throws SQLException if a database access error occurs | ||
| 1058 | */ | ||
| 1059 | private void initSQLStatements(CachedRowSet caller) throws SQLException { | ||
| 1060 | |||
| 1061 | int i; | ||
| 1062 | |||
| 1063 | callerMd = caller.getMetaData(); | ||
| 1064 | callerColumnCount = callerMd.getColumnCount(); | ||
| 1065 | if (callerColumnCount < 1) | ||
| 1066 | // No data, so return. | ||
| 1067 | return; | ||
| 1068 | |||
| 1069 | /* | ||
| 1070 | * If the RowSet has a Table name we should use it. | ||
| 1071 | * This is really a hack to get round the fact that | ||
| 1072 | * a lot of the jdbc drivers can't provide the tab. | ||
| 1073 | */ | ||
| 1074 | String table = caller.getTableName(); | ||
| 1075 | if (table == null) { | ||
| 1076 | /* | ||
| 1077 | * attempt to build a table name using the info | ||
| 1078 | * that the driver gave us for the first column | ||
| 1079 | * in the source result set. | ||
| 1080 | */ | ||
| 1081 | table = callerMd.getTableName(1); | ||
| 1082 | if (table == null || table.length() == 0) { | ||
| 1083 | throw new SQLException(resBundle.handleGetObject("crswriter.tname").toString()); | ||
| 1084 | } | ||
| 1085 | } | ||
| 1086 | String catalog = callerMd.getCatalogName(1); | ||
| 1087 | String schema = callerMd.getSchemaName(1); | ||
| 1088 | DatabaseMetaData dbmd = con.getMetaData(); | ||
| 1089 | |||
| 1090 | /* | ||
| 1091 | * Compose a SELECT statement. There are three parts. | ||
| 1092 | */ | ||
| 1093 | |||
| 1094 | // Project List | ||
| 1095 | selectCmd = "SELECT "; | ||
| 1096 | for (i=1; i <= callerColumnCount; i++) { | ||
| 1097 | selectCmd += callerMd.getColumnName(i); | ||
| 1098 | if ( i < callerMd.getColumnCount() ) | ||
| 1099 | selectCmd += ", "; | ||
| 1100 | else | ||
| 1101 | selectCmd += " "; | ||
| 1102 | } | ||
| 1103 | |||
| 1104 | // FROM clause. | ||
| 1105 | selectCmd += "FROM " + buildTableName(dbmd, catalog, schema, table); | ||
| 1106 | |||
| 1107 | /* | ||
| 1108 | * Compose an UPDATE statement. | ||
| 1109 | */ | ||
| 1110 | updateCmd = "UPDATE " + buildTableName(dbmd, catalog, schema, table); | ||
| 1111 | |||
| 1112 | |||
| 1113 | /** | ||
| 1114 | * The following block of code is for checking a particular type of | ||
| 1115 | * query where in there is a where clause. Without this block, if a | ||
| 1116 | * SQL statement is built the "where" clause will appear twice hence | ||
| 1117 | * the DB errors out and a SQLException is thrown. This code also | ||
| 1118 | * considers that the where clause is in the right place as the | ||
| 1119 | * CachedRowSet object would already have been populated with this | ||
| 1120 | * query before coming to this point. | ||
| 1121 | **/ | ||
| 1122 | |||
| 1123 | String tempupdCmd = updateCmd.toLowerCase(); | ||
| 1124 | |||
| 1125 | int idxupWhere = tempupdCmd.indexOf("where"); | ||
| 1126 | |||
| 1127 | if(idxupWhere != -1) | ||
| 1128 | { | ||
| 1129 | updateCmd = updateCmd.substring(0,idxupWhere); | ||
| 1130 | } | ||
| 1131 | updateCmd += "SET "; | ||
| 1132 | |||
| 1133 | /* | ||
| 1134 | * Compose an INSERT statement. | ||
| 1135 | */ | ||
| 1136 | insertCmd = "INSERT INTO " + buildTableName(dbmd, catalog, schema, table); | ||
| 1137 | // Column list | ||
| 1138 | insertCmd += "("; | ||
| 1139 | for (i=1; i <= callerColumnCount; i++) { | ||
| 1140 | insertCmd += callerMd.getColumnName(i); | ||
| 1141 | if ( i < callerMd.getColumnCount() ) | ||
| 1142 | insertCmd += ", "; | ||
| 1143 | else | ||
| 1144 | insertCmd += ") VALUES ("; | ||
| 1145 | } | ||
| 1146 | for (i=1; i <= callerColumnCount; i++) { | ||
| 1147 | insertCmd += "?"; | ||
| 1148 | if (i < callerColumnCount) | ||
| 1149 | insertCmd += ", "; | ||
| 1150 | else | ||
| 1151 | insertCmd += ")"; | ||
| 1152 | } | ||
| 1153 | |||
| 1154 | /* | ||
| 1155 | * Compose a DELETE statement. | ||
| 1156 | */ | ||
| 1157 | deleteCmd = "DELETE FROM " + buildTableName(dbmd, catalog, schema, table); | ||
| 1158 | |||
| 1159 | /* | ||
| 1160 | * set the key desriptors that will be | ||
| 1161 | * needed to construct where clauses. | ||
| 1162 | */ | ||
| 1163 | buildKeyDesc(caller); | ||
| 1164 | } | ||
| 1165 | |||
| 1166 | /** | ||
| 1167 | * Returns a fully qualified table name built from the given catalog and | ||
| 1168 | * table names. The given metadata object is used to get the proper order | ||
| 1169 | * and separator. | ||
| 1170 | * | ||
| 1171 | * @param dbmd a <code>DatabaseMetaData</code> object that contains metadata | ||
| 1172 | * about this writer's <code>CachedRowSet</code> object | ||
| 1173 | * @param catalog a <code>String</code> object with the rowset's catalog | ||
| 1174 | * name | ||
| 1175 | * @param table a <code>String</code> object with the name of the table from | ||
| 1176 | * which this writer's rowset was derived | ||
| 1177 | * @return a <code>String</code> object with the fully qualified name of the | ||
| 1178 | * table from which this writer's rowset was derived | ||
| 1179 | * @throws SQLException if a database access error occurs | ||
| 1180 | */ | ||
| 1181 | private String buildTableName(DatabaseMetaData dbmd, | ||
| 1182 | String catalog, String schema, String table) throws SQLException { | ||
| 1183 | |||
| 1184 | // trim all the leading and trailing whitespaces, | ||
| 1185 | // white spaces can never be catalog, schema or a table name. | ||
| 1186 | |||
| 1187 | String cmd = ""; | ||
| 1188 | |||
| 1189 | catalog = catalog.trim(); | ||
| 1190 | schema = schema.trim(); | ||
| 1191 | table = table.trim(); | ||
| 1192 | |||
| 1193 | if (dbmd.isCatalogAtStart() == true) { | ||
| 1194 | if (catalog != null && catalog.length() > 0) { | ||
| 1195 | cmd += catalog + dbmd.getCatalogSeparator(); | ||
| 1196 | } | ||
| 1197 | if (schema != null && schema.length() > 0) { | ||
| 1198 | cmd += schema + "."; | ||
| 1199 | } | ||
| 1200 | cmd += table; | ||
| 1201 | } else { | ||
| 1202 | if (schema != null && schema.length() > 0) { | ||
| 1203 | cmd += schema + "."; | ||
| 1204 | } | ||
| 1205 | cmd += table; | ||
| 1206 | if (catalog != null && catalog.length() > 0) { | ||
| 1207 | cmd += dbmd.getCatalogSeparator() + catalog; | ||
| 1208 | } | ||
| 1209 | } | ||
| 1210 | cmd += " "; | ||
| 1211 | return cmd; | ||
| 1212 | } | ||
| 1213 | |||
| 1214 | /** | ||
| 1215 | * Assigns to the given <code>CachedRowSet</code> object's | ||
| 1216 | * <code>params</code> | ||
| 1217 | * field an array whose length equals the number of columns needed | ||
| 1218 | * to uniquely identify a row in the rowset. The array is given | ||
| 1219 | * values by the method <code>buildWhereClause</code>. | ||
| 1220 | * <P> | ||
| 1221 | * If the <code>CachedRowSet</code> object's <code>keyCols</code> | ||
| 1222 | * field has length <code>0</code> or is <code>null</code>, the array | ||
| 1223 | * is set with the column number of every column in the rowset. | ||
| 1224 | * Otherwise, the array in the field <code>keyCols</code> is set with only | ||
| 1225 | * the column numbers of the columns that are required to form a unique | ||
| 1226 | * identifier for a row. | ||
| 1227 | * | ||
| 1228 | * @param crs the <code>CachedRowSet</code> object for which this | ||
| 1229 | * <code>CachedRowSetWriter</code> object is the writer | ||
| 1230 | * | ||
| 1231 | * @throws SQLException if a database access error occurs | ||
| 1232 | */ | ||
| 1233 | private void buildKeyDesc(CachedRowSet crs) throws SQLException { | ||
| 1234 | |||
| 1235 | keyCols = crs.getKeyColumns(); | ||
| 1236 | ResultSetMetaData resultsetmd = crs.getMetaData(); | ||
| 1237 | if (keyCols == null || keyCols.length == 0) { | ||
| 1238 | ArrayList<Integer> listKeys = new ArrayList<Integer>(); | ||
| 1239 | |||
| 1240 | for (int i = 0; i < callerColumnCount; i++ ) { | ||
| 1241 | if(resultsetmd.getColumnType(i+1) != java.sql.Types.CLOB && | ||
| 1242 | resultsetmd.getColumnType(i+1) != java.sql.Types.STRUCT && | ||
| 1243 | resultsetmd.getColumnType(i+1) != java.sql.Types.SQLXML && | ||
| 1244 | resultsetmd.getColumnType(i+1) != java.sql.Types.BLOB && | ||
| 1245 | resultsetmd.getColumnType(i+1) != java.sql.Types.ARRAY && | ||
| 1246 | resultsetmd.getColumnType(i+1) != java.sql.Types.OTHER ) | ||
| 1247 | listKeys.add(i+1); | ||
| 1248 | } | ||
| 1249 | keyCols = new int[listKeys.size()]; | ||
| 1250 | for (int i = 0; i < listKeys.size(); i++ ) | ||
| 1251 | keyCols[i] = listKeys.get(i); | ||
| 1252 | } | ||
| 1253 | params = new Object[keyCols.length]; | ||
| 1254 | } | ||
| 1255 | |||
| 1256 | /** | ||
| 1257 | * Constructs an SQL <code>WHERE</code> clause using the given | ||
| 1258 | * string as a starting point. The resulting clause will contain | ||
| 1259 | * a column name and " = ?" for each key column, that is, each column | ||
| 1260 | * that is needed to form a unique identifier for a row in the rowset. | ||
| 1261 | * This <code>WHERE</code> clause can be added to | ||
| 1262 | * a <code>PreparedStatement</code> object that updates, inserts, or | ||
| 1263 | * deletes a row. | ||
| 1264 | * <P> | ||
| 1265 | * This method uses the given result set to access values in the | ||
| 1266 | * <code>CachedRowSet</code> object that called this writer. These | ||
| 1267 | * values are used to build the array of parameters that will serve as | ||
| 1268 | * replacements for the "?" parameter placeholders in the | ||
| 1269 | * <code>PreparedStatement</code> object that is sent to the | ||
| 1270 | * <code>CachedRowSet</code> object's underlying data source. | ||
| 1271 | * | ||
| 1272 | * @param whereClause a <code>String</code> object that is an empty | ||
| 1273 | * string ("") | ||
| 1274 | * @param rs a <code>ResultSet</code> object that can be used | ||
| 1275 | * to access the <code>CachedRowSet</code> object's data | ||
| 1276 | * @return a <code>WHERE</code> clause of the form "<code>WHERE</code> | ||
| 1277 | * columnName = ? AND columnName = ? AND columnName = ? ..." | ||
| 1278 | * @throws SQLException if a database access error occurs | ||
| 1279 | */ | ||
| 1280 | private String buildWhereClause(String whereClause, | ||
| 1281 | ResultSet rs) throws SQLException { | ||
| 1282 | whereClause = "WHERE "; | ||
| 1283 | |||
| 1284 | for (int i = 0; i < keyCols.length; i++) { | ||
| 1285 | if (i > 0) { | ||
| 1286 | whereClause += "AND "; | ||
| 1287 | } | ||
| 1288 | whereClause += callerMd.getColumnName(keyCols[i]); | ||
| 1289 | params[i] = rs.getObject(keyCols[i]); | ||
| 1290 | if (rs.wasNull() == true) { | ||
| 1291 | whereClause += " IS NULL "; | ||
| 1292 | } else { | ||
| 1293 | whereClause += " = ? "; | ||
| 1294 | } | ||
| 1295 | } | ||
| 1296 | return whereClause; | ||
| 1297 | } | ||
| 1298 | |||
| 1299 | void updateResolvedConflictToDB(CachedRowSet crs, Connection con) throws SQLException { | ||
| 1300 | //String updateExe = ; | ||
| 1301 | PreparedStatement pStmt ; | ||
| 1302 | String strWhere = "WHERE " ; | ||
| 1303 | String strExec =" "; | ||
| 1304 | String strUpdate = "UPDATE "; | ||
| 1305 | int icolCount = crs.getMetaData().getColumnCount(); | ||
| 1306 | int keyColumns[] = crs.getKeyColumns(); | ||
| 1307 | Object param[]; | ||
| 1308 | String strSet=""; | ||
| 1309 | |||
| 1310 | strWhere = buildWhereClause(strWhere, crs); | ||
| 1311 | |||
| 1312 | if (keyColumns == null || keyColumns.length == 0) { | ||
| 1313 | keyColumns = new int[icolCount]; | ||
| 1314 | for (int i = 0; i < keyColumns.length; ) { | ||
| 1315 | keyColumns[i] = ++i; | ||
| 1316 | } | ||
| 1317 | } | ||
| 1318 | param = new Object[keyColumns.length]; | ||
| 1319 | |||
| 1320 | strUpdate = "UPDATE " + buildTableName(con.getMetaData(), | ||
| 1321 | crs.getMetaData().getCatalogName(1), | ||
| 1322 | crs.getMetaData().getSchemaName(1), | ||
| 1323 | crs.getTableName()); | ||
| 1324 | |||
| 1325 | // changed or updated values will become part of | ||
| 1326 | // set clause here | ||
| 1327 | strUpdate += "SET "; | ||
| 1328 | |||
| 1329 | boolean first = true; | ||
| 1330 | |||
| 1331 | for (int i=1; i<=icolCount;i++) { | ||
| 1332 | if (crs.columnUpdated(i)) { | ||
| 1333 | if (first == false) { | ||
| 1334 | strSet += ", "; | ||
| 1335 | } | ||
| 1336 | strSet += crs.getMetaData().getColumnName(i); | ||
| 1337 | strSet += " = ? "; | ||
| 1338 | first = false; | ||
| 1339 | } //end if | ||
| 1340 | } //end for | ||
| 1341 | |||
| 1342 | // keycols will become part of where clause | ||
| 1343 | strUpdate += strSet; | ||
| 1344 | strWhere = "WHERE "; | ||
| 1345 | |||
| 1346 | for (int i = 0; i < keyColumns.length; i++) { | ||
| 1347 | if (i > 0) { | ||
| 1348 | strWhere += "AND "; | ||
| 1349 | } | ||
| 1350 | strWhere += crs.getMetaData().getColumnName(keyColumns[i]); | ||
| 1351 | param[i] = crs.getObject(keyColumns[i]); | ||
| 1352 | if (crs.wasNull() == true) { | ||
| 1353 | strWhere += " IS NULL "; | ||
| 1354 | } else { | ||
| 1355 | strWhere += " = ? "; | ||
| 1356 | } | ||
| 1357 | } | ||
| 1358 | strUpdate += strWhere; | ||
| 1359 | |||
| 1360 | pStmt = con.prepareStatement(strUpdate); | ||
| 1361 | |||
| 1362 | int idx =0; | ||
| 1363 | for (int i = 0; i < icolCount; i++) { | ||
| 1364 | if(crs.columnUpdated(i+1)) { | ||
| 1365 | Object obj = crs.getObject(i+1); | ||
| 1366 | if (obj != null) { | ||
| 1367 | pStmt.setObject(++idx, obj); | ||
| 1368 | } else { | ||
| 1369 | pStmt.setNull(i + 1,crs.getMetaData().getColumnType(i + 1)); | ||
| 1370 | } //end if ..else | ||
| 1371 | } //end if crs.column... | ||
| 1372 | } //end for | ||
| 1373 | |||
| 1374 | // Set the key cols for after WHERE =? clause | ||
| 1375 | for (int i = 0; i < keyColumns.length; i++) { | ||
| 1376 | if (param[i] != null) { | ||
| 1377 | pStmt.setObject(++idx, param[i]); | ||
| 1378 | } | ||
| 1379 | } | ||
| 1380 | |||
| 1381 | int id = pStmt.executeUpdate(); | ||
| 1382 | } | ||
| 1383 | |||
| 1384 | |||
| 1385 | /** | ||
| 1386 | * | ||
| 1387 | */ | ||
| 1388 | public void commit() throws SQLException { | ||
| 1389 | con.commit(); | ||
| 1390 | if (reader.getCloseConnection() == true) { | ||
| 1391 | con.close(); | ||
| 1392 | } | ||
| 1393 | } | ||
| 1394 | |||
| 1395 | public void commit(CachedRowSetImpl crs, boolean updateRowset) throws SQLException { | ||
| 1396 | con.commit(); | ||
| 1397 | if(updateRowset) { | ||
| 1398 | if(crs.getCommand() != null) | ||
| 1399 | crs.execute(con); | ||
| 1400 | } | ||
| 1401 | |||
| 1402 | if (reader.getCloseConnection() == true) { | ||
| 1403 | con.close(); | ||
| 1404 | } | ||
| 1405 | } | ||
| 1406 | |||
| 1407 | /** | ||
| 1408 | * | ||
| 1409 | */ | ||
| 1410 | public void rollback() throws SQLException { | ||
| 1411 | con.rollback(); | ||
| 1412 | if (reader.getCloseConnection() == true) { | ||
| 1413 | con.close(); | ||
| 1414 | } | ||
| 1415 | } | ||
| 1416 | |||
| 1417 | /** | ||
| 1418 | * | ||
| 1419 | */ | ||
| 1420 | public void rollback(Savepoint s) throws SQLException { | ||
| 1421 | con.rollback(s); | ||
| 1422 | if (reader.getCloseConnection() == true) { | ||
| 1423 | con.close(); | ||
| 1424 | } | ||
| 1425 | } | ||
| 1426 | |||
| 1427 | private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException { | ||
| 1428 | // Default state initialization happens here | ||
| 1429 | ois.defaultReadObject(); | ||
| 1430 | // Initialization of Res Bundle happens here . | ||
| 1431 | try { | ||
| 1432 | resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle(); | ||
| 1433 | } catch(IOException ioe) { | ||
| 1434 | throw new RuntimeException(ioe); | ||
| 1435 | } | ||
| 1436 | |||
| 1437 | } | ||
| 1438 | |||
| 1439 | static final long serialVersionUID =-8506030970299413976L; | ||
| 1440 | } | ||