| 1 | /* |
| 2 | Copyright (C) 2002-2004 MySQL AB |
| 3 | |
| 4 | This program is free software; you can redistribute it and/or modify |
| 5 | it under the terms of version 2 of the GNU General Public License as |
| 6 | published by the Free Software Foundation. |
| 7 | |
| 8 | There are special exceptions to the terms and conditions of the GPL |
| 9 | as it is applied to this software. View the full text of the |
| 10 | exception in file EXCEPTIONS-CONNECTOR-J in the directory of this |
| 11 | software distribution. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | |
| 22 | |
| 23 | |
| 24 | */ |
| 25 | package com.mysql.jdbc; |
| 26 | |
| 27 | import java.io.BufferedInputStream; |
| 28 | import java.io.IOException; |
| 29 | import java.io.InputStream; |
| 30 | import java.io.OutputStream; |
| 31 | import java.sql.SQLException; |
| 32 | import java.util.ArrayList; |
| 33 | import java.util.List; |
| 34 | |
| 35 | /** |
| 36 | * The representation (mapping) in the JavaTM programming language of an SQL |
| 37 | * BLOB value. An SQL BLOB is a built-in type that stores a Binary Large Object |
| 38 | * as a column value in a row of a database table. The driver implements Blob |
| 39 | * using an SQL locator(BLOB), which means that a Blob object contains a logical |
| 40 | * pointer to the SQL BLOB data rather than the data itself. A Blob object is |
| 41 | * valid for the duration of the transaction in which is was created. Methods in |
| 42 | * the interfaces ResultSet, CallableStatement, and PreparedStatement, such as |
| 43 | * getBlob and setBlob allow a programmer to access an SQL BLOB value. The Blob |
| 44 | * interface provides methods for getting the length of an SQL BLOB (Binary |
| 45 | * Large Object) value, for materializing a BLOB value on the client, and for |
| 46 | * determining the position of a pattern of bytes within a BLOB value. This |
| 47 | * class is new in the JDBC 2.0 API. |
| 48 | * |
| 49 | * @author Mark Matthews |
| 50 | * |
| 51 | * @version $Id: BlobFromLocator.java,v 1.1.4.1 2005/05/19 18:31:49 mmatthews |
| 52 | * Exp $ |
| 53 | */ |
| 54 | public class BlobFromLocator implements java.sql.Blob { |
| 55 | private List primaryKeyColumns = null; |
| 56 | |
| 57 | private List primaryKeyValues = null; |
| 58 | |
| 59 | /** The ResultSet that created this BLOB */ |
| 60 | private ResultSet creatorResultSet; |
| 61 | |
| 62 | private String blobColumnName = null; |
| 63 | |
| 64 | private String tableName = null; |
| 65 | |
| 66 | private int numColsInResultSet = 0; |
| 67 | |
| 68 | private int numPrimaryKeys = 0; |
| 69 | |
| 70 | private String quotedId; |
| 71 | |
| 72 | /** |
| 73 | * Creates an updatable BLOB that can update in-place |
| 74 | */ |
| 75 | BlobFromLocator(ResultSet creatorResultSetToSet, int blobColumnIndex) |
| 76 | throws SQLException { |
| 77 | this.creatorResultSet = creatorResultSetToSet; |
| 78 | |
| 79 | this.numColsInResultSet = this.creatorResultSet.fields.length; |
| 80 | this.quotedId = this.creatorResultSet.connection.getMetaData() |
| 81 | .getIdentifierQuoteString(); |
| 82 | |
| 83 | if (this.numColsInResultSet > 1) { |
| 84 | this.primaryKeyColumns = new ArrayList(); |
| 85 | this.primaryKeyValues = new ArrayList(); |
| 86 | |
| 87 | for (int i = 0; i < this.numColsInResultSet; i++) { |
| 88 | if (this.creatorResultSet.fields[i].isPrimaryKey()) { |
| 89 | StringBuffer keyName = new StringBuffer(); |
| 90 | keyName.append(quotedId); |
| 91 | |
| 92 | String originalColumnName = this.creatorResultSet.fields[i] |
| 93 | .getOriginalName(); |
| 94 | |
| 95 | if ((originalColumnName != null) |
| 96 | && (originalColumnName.length() > 0)) { |
| 97 | keyName.append(originalColumnName); |
| 98 | } else { |
| 99 | keyName.append(this.creatorResultSet.fields[i] |
| 100 | .getName()); |
| 101 | } |
| 102 | |
| 103 | keyName.append(quotedId); |
| 104 | |
| 105 | this.primaryKeyColumns.add(keyName.toString()); |
| 106 | this.primaryKeyValues.add(this.creatorResultSet |
| 107 | .getString(i + 1)); |
| 108 | } |
| 109 | } |
| 110 | } else { |
| 111 | notEnoughInformationInQuery(); |
| 112 | } |
| 113 | |
| 114 | this.numPrimaryKeys = this.primaryKeyColumns.size(); |
| 115 | |
| 116 | if (this.numPrimaryKeys == 0) { |
| 117 | notEnoughInformationInQuery(); |
| 118 | } |
| 119 | |
| 120 | if (this.creatorResultSet.fields[0].getOriginalTableName() != null) { |
| 121 | StringBuffer tableNameBuffer = new StringBuffer(); |
| 122 | |
| 123 | String databaseName = this.creatorResultSet.fields[0] |
| 124 | .getDatabaseName(); |
| 125 | |
| 126 | if ((databaseName != null) && (databaseName.length() > 0)) { |
| 127 | tableNameBuffer.append(quotedId); |
| 128 | tableNameBuffer.append(databaseName); |
| 129 | tableNameBuffer.append(quotedId); |
| 130 | tableNameBuffer.append('.'); |
| 131 | } |
| 132 | |
| 133 | tableNameBuffer.append(quotedId); |
| 134 | tableNameBuffer.append(this.creatorResultSet.fields[0] |
| 135 | .getOriginalTableName()); |
| 136 | tableNameBuffer.append(quotedId); |
| 137 | |
| 138 | this.tableName = tableNameBuffer.toString(); |
| 139 | } else { |
| 140 | StringBuffer tableNameBuffer = new StringBuffer(); |
| 141 | |
| 142 | tableNameBuffer.append(quotedId); |
| 143 | tableNameBuffer.append(this.creatorResultSet.fields[0] |
| 144 | .getTableName()); |
| 145 | tableNameBuffer.append(quotedId); |
| 146 | |
| 147 | this.tableName = tableNameBuffer.toString(); |
| 148 | } |
| 149 | |
| 150 | this.blobColumnName = quotedId |
| 151 | + this.creatorResultSet.getString(blobColumnIndex) + quotedId; |
| 152 | } |
| 153 | |
| 154 | private void notEnoughInformationInQuery() throws SQLException { |
| 155 | throw SQLError.createSQLException("Emulated BLOB locators must come from " |
| 156 | + "a ResultSet with only one table selected, and all primary " |
| 157 | + "keys selected", SQLError.SQL_STATE_GENERAL_ERROR); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * @see Blob#setBinaryStream(long) |
| 162 | */ |
| 163 | public OutputStream setBinaryStream(long indexToWriteAt) |
| 164 | throws SQLException { |
| 165 | throw new NotImplemented(); |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * Retrieves the BLOB designated by this Blob instance as a stream. |
| 170 | * |
| 171 | * @return this BLOB represented as a binary stream of bytes. |
| 172 | * |
| 173 | * @throws SQLException |
| 174 | * if a database error occurs |
| 175 | */ |
| 176 | public java.io.InputStream getBinaryStream() throws SQLException { |
| 177 | // TODO: Make fetch size configurable |
| 178 | return new BufferedInputStream(new LocatorInputStream(), |
| 179 | this.creatorResultSet.connection.getLocatorFetchBufferSize()); |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * @see Blob#setBytes(long, byte[], int, int) |
| 184 | */ |
| 185 | public int setBytes(long writeAt, byte[] bytes, int offset, int length) |
| 186 | throws SQLException { |
| 187 | java.sql.PreparedStatement pStmt = null; |
| 188 | |
| 189 | if ((offset + length) > bytes.length) { |
| 190 | length = bytes.length - offset; |
| 191 | } |
| 192 | |
| 193 | byte[] bytesToWrite = new byte[length]; |
| 194 | System.arraycopy(bytes, offset, bytesToWrite, 0, length); |
| 195 | |
| 196 | // FIXME: Needs to use identifiers for column/table names |
| 197 | StringBuffer query = new StringBuffer("UPDATE "); |
| 198 | query.append(this.tableName); |
| 199 | query.append(" SET "); |
| 200 | query.append(this.blobColumnName); |
| 201 | query.append(" = INSERT("); |
| 202 | query.append(this.blobColumnName); |
| 203 | query.append(", "); |
| 204 | query.append(writeAt); |
| 205 | query.append(", "); |
| 206 | query.append(length); |
| 207 | query.append(", ?) WHERE "); |
| 208 | |
| 209 | query.append((String) this.primaryKeyColumns.get(0)); |
| 210 | query.append(" = ?"); |
| 211 | |
| 212 | for (int i = 1; i < this.numPrimaryKeys; i++) { |
| 213 | query.append(" AND "); |
| 214 | query.append((String) this.primaryKeyColumns.get(i)); |
| 215 | query.append(" = ?"); |
| 216 | } |
| 217 | |
| 218 | try { |
| 219 | // FIXME: Have this passed in instead |
| 220 | pStmt = this.creatorResultSet.connection.prepareStatement(query |
| 221 | .toString()); |
| 222 | |
| 223 | pStmt.setBytes(1, bytesToWrite); |
| 224 | |
| 225 | for (int i = 0; i < this.numPrimaryKeys; i++) { |
| 226 | pStmt.setString(i + 2, (String) this.primaryKeyValues.get(i)); |
| 227 | } |
| 228 | |
| 229 | int rowsUpdated = pStmt.executeUpdate(); |
| 230 | |
| 231 | if (rowsUpdated != 1) { |
| 232 | throw SQLError.createSQLException( |
| 233 | "BLOB data not found! Did primary keys change?", |
| 234 | SQLError.SQL_STATE_GENERAL_ERROR); |
| 235 | } |
| 236 | } finally { |
| 237 | if (pStmt != null) { |
| 238 | try { |
| 239 | pStmt.close(); |
| 240 | } catch (SQLException sqlEx) { |
| 241 | ; // do nothing |
| 242 | } |
| 243 | |
| 244 | pStmt = null; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | return (int) length(); |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * @see Blob#setBytes(long, byte[]) |
| 253 | */ |
| 254 | public int setBytes(long writeAt, byte[] bytes) throws SQLException { |
| 255 | return setBytes(writeAt, bytes, 0, bytes.length); |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Returns as an array of bytes, part or all of the BLOB value that this |
| 260 | * Blob object designates. |
| 261 | * |
| 262 | * @param pos |
| 263 | * where to start the part of the BLOB |
| 264 | * @param length |
| 265 | * the length of the part of the BLOB you want returned. |
| 266 | * |
| 267 | * @return the bytes stored in the blob starting at position |
| 268 | * <code>pos</code> and having a length of <code>length</code>. |
| 269 | * |
| 270 | * @throws SQLException |
| 271 | * if a database error occurs |
| 272 | */ |
| 273 | public byte[] getBytes(long pos, int length) throws SQLException { |
| 274 | java.sql.ResultSet blobRs = null; |
| 275 | java.sql.PreparedStatement pStmt = null; |
| 276 | |
| 277 | try { |
| 278 | |
| 279 | pStmt = createGetBytesStatement(); |
| 280 | |
| 281 | return getBytesInternal(pStmt, pos, length); |
| 282 | } finally { |
| 283 | if (blobRs != null) { |
| 284 | try { |
| 285 | blobRs.close(); |
| 286 | } catch (SQLException sqlEx) { |
| 287 | ; // do nothing |
| 288 | } |
| 289 | |
| 290 | blobRs = null; |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Returns the number of bytes in the BLOB value designated by this Blob |
| 297 | * object. |
| 298 | * |
| 299 | * @return the length of this blob |
| 300 | * |
| 301 | * @throws SQLException |
| 302 | * if a database error occurs |
| 303 | */ |
| 304 | public long length() throws SQLException { |
| 305 | java.sql.ResultSet blobRs = null; |
| 306 | java.sql.PreparedStatement pStmt = null; |
| 307 | |
| 308 | // FIXME: Needs to use identifiers for column/table names |
| 309 | StringBuffer query = new StringBuffer("SELECT LENGTH("); |
| 310 | query.append(this.blobColumnName); |
| 311 | query.append(") FROM "); |
| 312 | query.append(this.tableName); |
| 313 | query.append(" WHERE "); |
| 314 | |
| 315 | query.append((String) this.primaryKeyColumns.get(0)); |
| 316 | query.append(" = ?"); |
| 317 | |
| 318 | for (int i = 1; i < this.numPrimaryKeys; i++) { |
| 319 | query.append(" AND "); |
| 320 | query.append((String) this.primaryKeyColumns.get(i)); |
| 321 | query.append(" = ?"); |
| 322 | } |
| 323 | |
| 324 | try { |
| 325 | // FIXME: Have this passed in instead |
| 326 | pStmt = this.creatorResultSet.connection.prepareStatement(query |
| 327 | .toString()); |
| 328 | |
| 329 | for (int i = 0; i < this.numPrimaryKeys; i++) { |
| 330 | pStmt.setString(i + 1, (String) this.primaryKeyValues.get(i)); |
| 331 | } |
| 332 | |
| 333 | blobRs = pStmt.executeQuery(); |
| 334 | |
| 335 | if (blobRs.next()) { |
| 336 | return blobRs.getLong(1); |
| 337 | } |
| 338 | |
| 339 | throw SQLError.createSQLException( |
| 340 | "BLOB data not found! Did primary keys change?", |
| 341 | SQLError.SQL_STATE_GENERAL_ERROR); |
| 342 | } finally { |
| 343 | if (blobRs != null) { |
| 344 | try { |
| 345 | blobRs.close(); |
| 346 | } catch (SQLException sqlEx) { |
| 347 | ; // do nothing |
| 348 | } |
| 349 | |
| 350 | blobRs = null; |
| 351 | } |
| 352 | |
| 353 | if (pStmt != null) { |
| 354 | try { |
| 355 | pStmt.close(); |
| 356 | } catch (SQLException sqlEx) { |
| 357 | ; // do nothing |
| 358 | } |
| 359 | |
| 360 | pStmt = null; |
| 361 | } |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | /** |
| 366 | * Finds the position of the given pattern in this BLOB. |
| 367 | * |
| 368 | * @param pattern |
| 369 | * the pattern to find |
| 370 | * @param start |
| 371 | * where to start finding the pattern |
| 372 | * |
| 373 | * @return the position where the pattern is found in the BLOB, -1 if not |
| 374 | * found |
| 375 | * |
| 376 | * @throws SQLException |
| 377 | * if a database error occurs |
| 378 | */ |
| 379 | public long position(java.sql.Blob pattern, long start) throws SQLException { |
| 380 | return position(pattern.getBytes(0, (int) pattern.length()), start); |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * @see java.sql.Blob#position(byte[], long) |
| 385 | */ |
| 386 | public long position(byte[] pattern, long start) throws SQLException { |
| 387 | java.sql.ResultSet blobRs = null; |
| 388 | java.sql.PreparedStatement pStmt = null; |
| 389 | |
| 390 | // FIXME: Needs to use identifiers for column/table names |
| 391 | StringBuffer query = new StringBuffer("SELECT LOCATE("); |
| 392 | query.append("?, "); |
| 393 | query.append(this.blobColumnName); |
| 394 | query.append(", "); |
| 395 | query.append(start); |
| 396 | query.append(") FROM "); |
| 397 | query.append(this.tableName); |
| 398 | query.append(" WHERE "); |
| 399 | |
| 400 | query.append((String) this.primaryKeyColumns.get(0)); |
| 401 | query.append(" = ?"); |
| 402 | |
| 403 | for (int i = 1; i < this.numPrimaryKeys; i++) { |
| 404 | query.append(" AND "); |
| 405 | query.append((String) this.primaryKeyColumns.get(i)); |
| 406 | query.append(" = ?"); |
| 407 | } |
| 408 | |
| 409 | try { |
| 410 | // FIXME: Have this passed in instead |
| 411 | pStmt = this.creatorResultSet.connection.prepareStatement(query |
| 412 | .toString()); |
| 413 | pStmt.setBytes(1, pattern); |
| 414 | |
| 415 | for (int i = 0; i < this.numPrimaryKeys; i++) { |
| 416 | pStmt.setString(i + 2, (String) this.primaryKeyValues.get(i)); |
| 417 | } |
| 418 | |
| 419 | blobRs = pStmt.executeQuery(); |
| 420 | |
| 421 | if (blobRs.next()) { |
| 422 | return blobRs.getLong(1); |
| 423 | } |
| 424 | |
| 425 | throw SQLError.createSQLException( |
| 426 | "BLOB data not found! Did primary keys change?", |
| 427 | SQLError.SQL_STATE_GENERAL_ERROR); |
| 428 | } finally { |
| 429 | if (blobRs != null) { |
| 430 | try { |
| 431 | blobRs.close(); |
| 432 | } catch (SQLException sqlEx) { |
| 433 | ; // do nothing |
| 434 | } |
| 435 | |
| 436 | blobRs = null; |
| 437 | } |
| 438 | |
| 439 | if (pStmt != null) { |
| 440 | try { |
| 441 | pStmt.close(); |
| 442 | } catch (SQLException sqlEx) { |
| 443 | ; // do nothing |
| 444 | } |
| 445 | |
| 446 | pStmt = null; |
| 447 | } |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | /** |
| 452 | * @see Blob#truncate(long) |
| 453 | */ |
| 454 | public void truncate(long length) throws SQLException { |
| 455 | java.sql.PreparedStatement pStmt = null; |
| 456 | |
| 457 | // FIXME: Needs to use identifiers for column/table names |
| 458 | StringBuffer query = new StringBuffer("UPDATE "); |
| 459 | query.append(this.tableName); |
| 460 | query.append(" SET "); |
| 461 | query.append(this.blobColumnName); |
| 462 | query.append(" = LEFT("); |
| 463 | query.append(this.blobColumnName); |
| 464 | query.append(", "); |
| 465 | query.append(length); |
| 466 | query.append(") WHERE "); |
| 467 | |
| 468 | query.append((String) this.primaryKeyColumns.get(0)); |
| 469 | query.append(" = ?"); |
| 470 | |
| 471 | for (int i = 1; i < this.numPrimaryKeys; i++) { |
| 472 | query.append(" AND "); |
| 473 | query.append((String) this.primaryKeyColumns.get(i)); |
| 474 | query.append(" = ?"); |
| 475 | } |
| 476 | |
| 477 | try { |
| 478 | // FIXME: Have this passed in instead |
| 479 | pStmt = this.creatorResultSet.connection.prepareStatement(query |
| 480 | .toString()); |
| 481 | |
| 482 | for (int i = 0; i < this.numPrimaryKeys; i++) { |
| 483 | pStmt.setString(i + 1, (String) this.primaryKeyValues.get(i)); |
| 484 | } |
| 485 | |
| 486 | int rowsUpdated = pStmt.executeUpdate(); |
| 487 | |
| 488 | if (rowsUpdated != 1) { |
| 489 | throw SQLError.createSQLException( |
| 490 | "BLOB data not found! Did primary keys change?", |
| 491 | SQLError.SQL_STATE_GENERAL_ERROR); |
| 492 | } |
| 493 | } finally { |
| 494 | if (pStmt != null) { |
| 495 | try { |
| 496 | pStmt.close(); |
| 497 | } catch (SQLException sqlEx) { |
| 498 | ; // do nothing |
| 499 | } |
| 500 | |
| 501 | pStmt = null; |
| 502 | } |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | java.sql.PreparedStatement createGetBytesStatement() throws SQLException { |
| 507 | StringBuffer query = new StringBuffer("SELECT SUBSTRING("); |
| 508 | |
| 509 | query.append(this.blobColumnName); |
| 510 | query.append(", "); |
| 511 | query.append("?"); |
| 512 | query.append(", "); |
| 513 | query.append("?"); |
| 514 | query.append(") FROM "); |
| 515 | query.append(this.tableName); |
| 516 | query.append(" WHERE "); |
| 517 | |
| 518 | query.append((String) this.primaryKeyColumns.get(0)); |
| 519 | query.append(" = ?"); |
| 520 | |
| 521 | for (int i = 1; i < this.numPrimaryKeys; i++) { |
| 522 | query.append(" AND "); |
| 523 | query.append((String) this.primaryKeyColumns.get(i)); |
| 524 | query.append(" = ?"); |
| 525 | } |
| 526 | |
| 527 | return this.creatorResultSet.connection.prepareStatement(query |
| 528 | .toString()); |
| 529 | } |
| 530 | |
| 531 | byte[] getBytesInternal(java.sql.PreparedStatement pStmt, long pos, |
| 532 | int length) throws SQLException { |
| 533 | |
| 534 | java.sql.ResultSet blobRs = null; |
| 535 | |
| 536 | try { |
| 537 | |
| 538 | pStmt.setLong(1, pos); |
| 539 | pStmt.setInt(2, length); |
| 540 | |
| 541 | for (int i = 0; i < this.numPrimaryKeys; i++) { |
| 542 | pStmt.setString(i + 3, (String) this.primaryKeyValues.get(i)); |
| 543 | } |
| 544 | |
| 545 | blobRs = pStmt.executeQuery(); |
| 546 | |
| 547 | if (blobRs.next()) { |
| 548 | return ((com.mysql.jdbc.ResultSet) blobRs).getBytes(1, true); |
| 549 | } |
| 550 | |
| 551 | throw SQLError.createSQLException( |
| 552 | "BLOB data not found! Did primary keys change?", |
| 553 | SQLError.SQL_STATE_GENERAL_ERROR); |
| 554 | } finally { |
| 555 | if (blobRs != null) { |
| 556 | try { |
| 557 | blobRs.close(); |
| 558 | } catch (SQLException sqlEx) { |
| 559 | ; // do nothing |
| 560 | } |
| 561 | |
| 562 | blobRs = null; |
| 563 | } |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | class LocatorInputStream extends InputStream { |
| 568 | long currentPositionInBlob = 0; |
| 569 | |
| 570 | long length = 0; |
| 571 | |
| 572 | java.sql.PreparedStatement pStmt = null; |
| 573 | |
| 574 | LocatorInputStream() throws SQLException { |
| 575 | length = length(); |
| 576 | pStmt = createGetBytesStatement(); |
| 577 | } |
| 578 | |
| 579 | public int read() throws IOException { |
| 580 | if (currentPositionInBlob + 1 > length) { |
| 581 | return -1; |
| 582 | } |
| 583 | |
| 584 | try { |
| 585 | byte[] asBytes = getBytesInternal(pStmt, |
| 586 | (currentPositionInBlob++) + 1, 1); |
| 587 | |
| 588 | if (asBytes == null) { |
| 589 | return -1; |
| 590 | } |
| 591 | |
| 592 | return asBytes[0]; |
| 593 | } catch (SQLException sqlEx) { |
| 594 | throw new IOException(sqlEx.toString()); |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * (non-Javadoc) |
| 600 | * |
| 601 | * @see java.io.InputStream#read(byte[], int, int) |
| 602 | */ |
| 603 | public int read(byte[] b, int off, int len) throws IOException { |
| 604 | if (currentPositionInBlob + 1 > length) { |
| 605 | return -1; |
| 606 | } |
| 607 | |
| 608 | try { |
| 609 | byte[] asBytes = getBytesInternal(pStmt, |
| 610 | (currentPositionInBlob) + 1, len); |
| 611 | |
| 612 | if (asBytes == null) { |
| 613 | return -1; |
| 614 | } |
| 615 | |
| 616 | System.arraycopy(asBytes, 0, b, off, asBytes.length); |
| 617 | |
| 618 | currentPositionInBlob += asBytes.length; |
| 619 | |
| 620 | return asBytes.length; |
| 621 | } catch (SQLException sqlEx) { |
| 622 | throw new IOException(sqlEx.toString()); |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * (non-Javadoc) |
| 628 | * |
| 629 | * @see java.io.InputStream#read(byte[]) |
| 630 | */ |
| 631 | public int read(byte[] b) throws IOException { |
| 632 | if (currentPositionInBlob + 1 > length) { |
| 633 | return -1; |
| 634 | } |
| 635 | |
| 636 | try { |
| 637 | byte[] asBytes = getBytesInternal(pStmt, |
| 638 | (currentPositionInBlob) + 1, b.length); |
| 639 | |
| 640 | if (asBytes == null) { |
| 641 | return -1; |
| 642 | } |
| 643 | |
| 644 | System.arraycopy(asBytes, 0, b, 0, asBytes.length); |
| 645 | |
| 646 | currentPositionInBlob += asBytes.length; |
| 647 | |
| 648 | return asBytes.length; |
| 649 | } catch (SQLException sqlEx) { |
| 650 | throw new IOException(sqlEx.toString()); |
| 651 | } |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * (non-Javadoc) |
| 656 | * |
| 657 | * @see java.io.InputStream#close() |
| 658 | */ |
| 659 | public void close() throws IOException { |
| 660 | if (pStmt != null) { |
| 661 | try { |
| 662 | pStmt.close(); |
| 663 | } catch (SQLException sqlEx) { |
| 664 | throw new IOException(sqlEx.toString()); |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | super.close(); |
| 669 | } |
| 670 | } |
| 671 | } |