| 1 | /** |
| 2 | * Copyright (C) 2006 NetMind Consulting Bt. |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 3 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
| 18 | |
| 19 | package hu.netmind.beankeeper.db.impl; |
| 20 | |
| 21 | import java.util.Map; |
| 22 | import java.sql.Connection; |
| 23 | import java.sql.PreparedStatement; |
| 24 | import java.sql.SQLException; |
| 25 | import java.util.Iterator; |
| 26 | import java.util.ArrayList; |
| 27 | import java.util.HashSet; |
| 28 | import java.util.Set; |
| 29 | import java.util.Map; |
| 30 | import java.util.ArrayList; |
| 31 | import java.util.Date; |
| 32 | import java.util.Collections; |
| 33 | import java.util.Collection; |
| 34 | import java.util.List; |
| 35 | import java.util.HashMap; |
| 36 | import java.util.Stack; |
| 37 | import java.util.LinkedList; |
| 38 | import java.sql.Timestamp; |
| 39 | import org.apache.log4j.Logger; |
| 40 | import java.sql.ResultSet; |
| 41 | import java.sql.DatabaseMetaData; |
| 42 | import java.sql.Types; |
| 43 | import java.sql.ResultSetMetaData; |
| 44 | import hu.netmind.beankeeper.parser.*; |
| 45 | import hu.netmind.beankeeper.common.StoreException; |
| 46 | import hu.netmind.beankeeper.transaction.*; |
| 47 | import hu.netmind.beankeeper.db.*; |
| 48 | import hu.netmind.beankeeper.logging.AggregatorLogger; |
| 49 | |
| 50 | /** |
| 51 | * This is a generic database implementation. It contains no optimization, |
| 52 | * and tries to be as generic with types and sql syntax as possible, this also |
| 53 | * means, it cannot handle limits and offsets, which causes <strong>all</strong> |
| 54 | * results to be returned, even with lazy lists. |
| 55 | * @author Brautigam Robert |
| 56 | * @version Revision: $Revision$ |
| 57 | */ |
| 58 | public class GenericDatabase extends DatabaseBase implements Database |
| 59 | { |
| 60 | private static Logger logger = Logger.getLogger(GenericDatabase.class); |
| 61 | private static Logger sqlLogger = Logger.getLogger("hu.netmind.beankeeper.sql"); |
| 62 | |
| 63 | private AggregatorLogger aggregatorLogger = null; // Injected |
| 64 | |
| 65 | /** |
| 66 | * Save basic attribute information, so we have it ready when needed. |
| 67 | */ |
| 68 | private Map tableAttributes = Collections.synchronizedMap(new HashMap()); |
| 69 | |
| 70 | protected Map getAttributes(String tableName) |
| 71 | { |
| 72 | return (Map) tableAttributes.get(tableName.toLowerCase()); |
| 73 | } |
| 74 | |
| 75 | protected Class getAttributeType(String tableName, String attributeName) |
| 76 | { |
| 77 | return (Class) getAttributes(tableName).get(attributeName.toLowerCase()); |
| 78 | } |
| 79 | |
| 80 | private void setAttributes(String tableName, Map attributes) |
| 81 | { |
| 82 | tableAttributes.put(tableName,attributes); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Make a save statement for given table, id and changed attributes. |
| 87 | * Override this method in a subclass for a non-generic behaviour. |
| 88 | * The attributes' placeholders must be in the same order as given |
| 89 | * by the attributeNames list. |
| 90 | * @param tableName The table to save attributes to. |
| 91 | * @param keyNames The keys of object to save (All object entries have keys). |
| 92 | * @param attributeNames The attributes that will change. |
| 93 | * the statement. |
| 94 | * @param keys Keys. |
| 95 | * @return An SQL save/update statement specific to database backend. |
| 96 | */ |
| 97 | protected String getSaveStatement(String tableName, List keyNames, List attributeNames, |
| 98 | Map keys) |
| 99 | { |
| 100 | // Make a generic update statement |
| 101 | StringBuffer statement = new StringBuffer("update "+tableName+ |
| 102 | " set "); |
| 103 | for ( int i=0; i<attributeNames.size(); i++ ) |
| 104 | statement.append(attributeNames.get(i).toString()+"=?,"); |
| 105 | statement.delete(statement.length()-1,statement.length()); |
| 106 | if ( keyNames.size() > 0 ) |
| 107 | statement.append(" where "); |
| 108 | for ( int i=0; i<keyNames.size(); i++ ) |
| 109 | { |
| 110 | String keyName = keyNames.get(i).toString(); |
| 111 | if ( keys.get(keyName) == null ) |
| 112 | { |
| 113 | statement.append(keyName+" is null and "); |
| 114 | keyNames.remove(keyName); |
| 115 | i--; |
| 116 | } else |
| 117 | statement.append(keyName+"=? and "); |
| 118 | } |
| 119 | statement.delete(statement.length()-5,statement.length()); |
| 120 | sqlLogger.debug("preparing update statement: "+statement.toString()); |
| 121 | // Return |
| 122 | return statement.toString(); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Modifies an object already in database with given fields. |
| 127 | * @param tableName The table to save attributes to. |
| 128 | * @param id The id of object to save (All object entries have an id). |
| 129 | * @param attributes The attributes in form of name:value pairs. |
| 130 | */ |
| 131 | protected TransactionStatistics save(Connection connection, String tableName, |
| 132 | Map keys, Map attributes) |
| 133 | { |
| 134 | TransactionStatistics stats = new TransactionStatistics(); |
| 135 | // Clear null values from attributes |
| 136 | attributes = new HashMap(attributes); |
| 137 | ArrayList nullArrayList = new ArrayList(); |
| 138 | nullArrayList.add(null); |
| 139 | attributes.values().removeAll(nullArrayList); |
| 140 | // Make a generic insert statement |
| 141 | ArrayList attributeNames = new ArrayList(attributes.keySet()); |
| 142 | ArrayList keyNames = new ArrayList(keys.keySet()); |
| 143 | String statement = getSaveStatement(tableName,keyNames,attributeNames,keys); |
| 144 | // Prepare |
| 145 | PreparedStatement pstmt; |
| 146 | try |
| 147 | { |
| 148 | pstmt = connection.prepareStatement(statement); |
| 149 | int i=0; |
| 150 | for ( ; i<attributeNames.size(); i++ ) |
| 151 | { |
| 152 | Object value = getSQLValue(attributes.get(attributeNames.get(i))); |
| 153 | Class type = getAttributeType(tableName,(String) attributeNames.get(i)); |
| 154 | sqlLogger.debug("setting statement parameter #"+i+": "+value); |
| 155 | pstmt.setObject(i+1,value,getSQLType(type)); |
| 156 | } |
| 157 | for ( ; i<keyNames.size()+attributeNames.size(); i++ ) |
| 158 | { |
| 159 | Object value = getSQLValue(keys.get(keyNames.get(i-attributeNames.size()))); |
| 160 | sqlLogger.debug("setting statement parameter #"+i+": "+value); |
| 161 | pstmt.setObject(i+1,value); |
| 162 | } |
| 163 | } catch ( Exception e ) { |
| 164 | throw new StoreException("cannot prepare statement: "+statement,e); |
| 165 | } |
| 166 | // Execute |
| 167 | try |
| 168 | { |
| 169 | if ( logger.isDebugEnabled() ) |
| 170 | logger.debug("excuting update statement: "+statement); |
| 171 | long startTime = System.currentTimeMillis(); |
| 172 | pstmt.executeUpdate(); |
| 173 | long endTime = System.currentTimeMillis(); |
| 174 | aggregatorLogger.log("Update statement execution",new int[] { (int) (endTime-startTime) }); |
| 175 | stats.setUpdateCount(1); |
| 176 | stats.setUpdateTime(endTime-startTime); |
| 177 | } catch ( Exception e ) { |
| 178 | throw new StoreException("exception while sql update",e); |
| 179 | } finally { |
| 180 | try |
| 181 | { |
| 182 | pstmt.close(); |
| 183 | } catch ( Exception e ) { |
| 184 | logger.debug("unable to close statement",e); |
| 185 | } |
| 186 | } |
| 187 | // Return |
| 188 | return stats; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * Make an insert statement for given table, id and attributes. |
| 193 | * Override this method in a subclass for a non-generic behaviour. |
| 194 | * The attributes' placeholders must be in the same order as given |
| 195 | * by the attributeNames list. |
| 196 | * @param tableName The table to insert attributes to. |
| 197 | * @param attributeNames The attributes that will be inserted. |
| 198 | * @return An SQL insert statement specific to database backend. |
| 199 | */ |
| 200 | protected String getInsertStatement(String tableName, List attributeNames) |
| 201 | { |
| 202 | // Make a generic insert statement |
| 203 | StringBuffer statement = new StringBuffer("insert into "+tableName+ |
| 204 | " ("); |
| 205 | for ( int i=0; i<attributeNames.size(); i++ ) |
| 206 | statement.append(attributeNames.get(i).toString()+","); |
| 207 | statement.delete(statement.length()-1,statement.length()); |
| 208 | statement.append(") values ("); |
| 209 | for ( int i=0; i<attributeNames.size(); i++ ) |
| 210 | statement.append("?,"); |
| 211 | statement.delete(statement.length()-1,statement.length()); |
| 212 | statement.append(")"); |
| 213 | sqlLogger.debug("preparing insert statement: "+statement.toString()); |
| 214 | // Return |
| 215 | return statement.toString(); |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Insert an object into the database. |
| 220 | * @param tableName The table to save attributes to. |
| 221 | * @param id The id of object to save (All object entries have an id). |
| 222 | * @param attributes The attributes in form of name:value pairs. |
| 223 | */ |
| 224 | protected TransactionStatistics insert(Connection connection, String tableName, Map attributes) |
| 225 | { |
| 226 | TransactionStatistics stats = new TransactionStatistics(); |
| 227 | // Clear null values from attributes |
| 228 | attributes = new HashMap(attributes); |
| 229 | ArrayList nullArrayList = new ArrayList(); |
| 230 | nullArrayList.add(null); |
| 231 | attributes.values().removeAll(nullArrayList); |
| 232 | // Make a generic insert statement |
| 233 | ArrayList attributeNames = new ArrayList(attributes.keySet()); |
| 234 | String statement = getInsertStatement(tableName, attributeNames); |
| 235 | // Execute |
| 236 | PreparedStatement pstmt; |
| 237 | try |
| 238 | { |
| 239 | pstmt = connection.prepareStatement(statement); |
| 240 | for ( int i=0; i<attributeNames.size(); i++ ) |
| 241 | { |
| 242 | Object value = getSQLValue(attributes.get(attributeNames.get(i))); |
| 243 | Class type = getAttributeType(tableName,(String) attributeNames.get(i)); |
| 244 | sqlLogger.debug("setting statement parameter #"+i+": "+value); |
| 245 | pstmt.setObject(i+1,value,getSQLType(type)); |
| 246 | } |
| 247 | } catch ( Exception e ) { |
| 248 | throw new StoreException("cannot prepare statement: "+statement,e); |
| 249 | } |
| 250 | // Execute |
| 251 | try |
| 252 | { |
| 253 | if ( logger.isDebugEnabled() ) |
| 254 | logger.debug("excuting insert statement: "+statement); |
| 255 | long startTime = System.currentTimeMillis(); |
| 256 | pstmt.executeUpdate(); |
| 257 | long endTime = System.currentTimeMillis(); |
| 258 | aggregatorLogger.log("Insert statement execution",new int[] { (int) (endTime-startTime) }); |
| 259 | stats.setInsertCount(1); |
| 260 | stats.setInsertTime(endTime-startTime); |
| 261 | } catch ( Exception e ) { |
| 262 | throw new StoreException("exception while sql insert",e); |
| 263 | } finally { |
| 264 | try |
| 265 | { |
| 266 | pstmt.close(); |
| 267 | } catch ( Exception e ) { |
| 268 | logger.debug("unable to close statement",e); |
| 269 | } |
| 270 | } |
| 271 | // Return |
| 272 | return stats; |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Make a remove statement for given table and attributes. |
| 277 | * Override this method in a subclass for a non-generic behaviour. |
| 278 | * The attributes' placeholders must be in the same order as given |
| 279 | * by the attributeNames list. |
| 280 | * @param tableName The table to remove attributes from. |
| 281 | * @param attributeNames The attributes that will be search for by the remove. |
| 282 | * @return An SQL insert statement specific to database backend. |
| 283 | */ |
| 284 | protected String getRemoveStatement(String tableName, List attributeNames) |
| 285 | { |
| 286 | // Make a generic delete statement |
| 287 | // Please note the paticularly funny delete-6 to handle |
| 288 | // empty lists and list ends. |
| 289 | StringBuffer statement = new StringBuffer("delete from "+tableName); |
| 290 | if ( !attributeNames.isEmpty() ) |
| 291 | statement.append(" where "); |
| 292 | for ( int i=0; i<attributeNames.size(); i++ ) |
| 293 | statement.append(attributeNames.get(i).toString()+"=? and "); |
| 294 | if ( !attributeNames.isEmpty() ) |
| 295 | statement.delete(statement.length()-6,statement.length()); |
| 296 | sqlLogger.debug("preparing delete statement: "+statement.toString()); |
| 297 | // Return |
| 298 | return statement.toString(); |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * Remove an entry from database. |
| 303 | * @param tableName The table to remove object from. |
| 304 | * @param attributes The attributes which identify the object. |
| 305 | * Equality is assumed with each attribute and it's value. |
| 306 | */ |
| 307 | protected TransactionStatistics remove(Connection connection, String tableName, |
| 308 | Map attributes) |
| 309 | { |
| 310 | TransactionStatistics stats = new TransactionStatistics(); |
| 311 | // Clear null values from attributes |
| 312 | attributes = new HashMap(attributes); |
| 313 | ArrayList nullArrayList = new ArrayList(); |
| 314 | nullArrayList.add(null); |
| 315 | attributes.values().removeAll(nullArrayList); |
| 316 | // Make statement |
| 317 | ArrayList attributeNames = new ArrayList(attributes.keySet()); |
| 318 | String statement = getRemoveStatement(tableName, attributeNames); |
| 319 | // Prepare |
| 320 | PreparedStatement pstmt; |
| 321 | try |
| 322 | { |
| 323 | pstmt = connection.prepareStatement(statement); |
| 324 | for ( int i=0; i<attributeNames.size(); i++ ) |
| 325 | pstmt.setObject(i+1,getSQLValue(attributes.get(attributeNames.get(i)))); |
| 326 | } catch ( Exception e ) { |
| 327 | throw new StoreException("cannot prepare statement: "+statement,e); |
| 328 | } |
| 329 | // Execute |
| 330 | try |
| 331 | { |
| 332 | long startTime = System.currentTimeMillis(); |
| 333 | pstmt.executeUpdate(); |
| 334 | long endTime = System.currentTimeMillis(); |
| 335 | aggregatorLogger.log("Remove statement execution",new int[] { (int) (endTime-startTime) }); |
| 336 | stats.setDeleteCount(1); |
| 337 | stats.setDeleteTime(endTime-startTime); |
| 338 | } catch ( Exception e ) { |
| 339 | throw new StoreException("exception while sql delete",e); |
| 340 | } finally { |
| 341 | try |
| 342 | { |
| 343 | pstmt.close(); |
| 344 | } catch ( Exception e ) { |
| 345 | logger.debug("unable to close statement",e); |
| 346 | } |
| 347 | } |
| 348 | // Return |
| 349 | return stats; |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * Drop the table with given name. |
| 354 | * This method is not called directly, but from <code>ensureTable</code>. |
| 355 | * @param tableName The table to drop. |
| 356 | */ |
| 357 | protected TransactionStatistics dropTable(Connection connection, String tableName) |
| 358 | { |
| 359 | TransactionStatistics stats = new TransactionStatistics(); |
| 360 | // Create statement |
| 361 | String statement = "drop table "+tableName; |
| 362 | // Execute statement |
| 363 | long startTime = System.currentTimeMillis(); |
| 364 | executeUpdate(connection,statement); |
| 365 | long endTime = System.currentTimeMillis(); |
| 366 | stats.setSchemaCount(1); |
| 367 | stats.setSchemaTime(endTime-startTime); |
| 368 | return stats; |
| 369 | } |
| 370 | |
| 371 | /** |
| 372 | * Get the create table statement before the attributes part. |
| 373 | */ |
| 374 | protected String getCreateTableStatement(Connection connection, String tableName) |
| 375 | { |
| 376 | return "create table "+tableName; |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * Create table with given name, attribute types, and keys. |
| 381 | * This method is not called directly, but from <code>ensureTable</code>. |
| 382 | * @param tableName The table to create. |
| 383 | * @param attributeTypes The attribute names together with which |
| 384 | * java class they should hold. |
| 385 | */ |
| 386 | protected TransactionStatistics createTable(Connection connection, String tableName, |
| 387 | Map attributeTypes, List keyAttributeNames) |
| 388 | { |
| 389 | TransactionStatistics stats = new TransactionStatistics(); |
| 390 | // Create statement |
| 391 | StringBuffer statement = new StringBuffer(getCreateTableStatement(connection,tableName)+" ("); |
| 392 | Iterator iterator = attributeTypes.entrySet().iterator(); |
| 393 | while ( iterator.hasNext() ) |
| 394 | { |
| 395 | Map.Entry entry = (Map.Entry) iterator.next(); |
| 396 | statement.append(entry.getKey().toString()+" "+getSQLTypeName(getSQLType(((Class) entry.getValue())))+","); |
| 397 | } |
| 398 | if ( (keyAttributeNames!=null) && (keyAttributeNames.size() > 0) ) |
| 399 | { |
| 400 | statement.append(" primary key ("); |
| 401 | for ( int i=0; i<keyAttributeNames.size(); i++ ) |
| 402 | statement.append(keyAttributeNames.get(i)+","); |
| 403 | statement.delete(statement.length()-1,statement.length()); |
| 404 | statement.append(") "); |
| 405 | } |
| 406 | statement.delete(statement.length()-1,statement.length()); |
| 407 | statement.append(")"); |
| 408 | // Execute statement |
| 409 | long startTime = System.currentTimeMillis(); |
| 410 | executeUpdate(connection,statement.toString()); |
| 411 | long endTime = System.currentTimeMillis(); |
| 412 | stats.setSchemaCount(1); |
| 413 | stats.setSchemaTime(endTime-startTime); |
| 414 | // Create initial indexes (currently all attributes will be indexed) |
| 415 | // Do not create for reserved tables |
| 416 | if ( |
| 417 | (!tableName.equalsIgnoreCase("tablemap")) && |
| 418 | (!tableName.equalsIgnoreCase("nodes")) && |
| 419 | (!tableName.equalsIgnoreCase("classes")) ) |
| 420 | stats.add(createIndexes(connection, tableName, attributeTypes)); |
| 421 | return stats; |
| 422 | } |
| 423 | |
| 424 | /** |
| 425 | * Get the statement to drop a column. |
| 426 | */ |
| 427 | protected String getDropColumnStatement(String tableName, String columnName) |
| 428 | { |
| 429 | return "alter table "+tableName+" drop column "+columnName; |
| 430 | } |
| 431 | |
| 432 | /** |
| 433 | * Get the statement to add a column to a table. |
| 434 | */ |
| 435 | protected String getAddColumnStatement(String tableName, String columnName, String columnType) |
| 436 | { |
| 437 | return "alter table "+tableName+" add column "+columnName+" "+columnType; |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Drop a column from a table. |
| 442 | * @param connection The connection object. |
| 443 | * @param tableName The table to drop column from. |
| 444 | * @param columnName The column to drop. |
| 445 | */ |
| 446 | protected TransactionStatistics dropColumn(Connection connection, String tableName, |
| 447 | String columnName) |
| 448 | { |
| 449 | TransactionStatistics stats = new TransactionStatistics(); |
| 450 | long startTime = System.currentTimeMillis(); |
| 451 | executeUpdate(connection,getDropColumnStatement(tableName,columnName)); |
| 452 | long endTime = System.currentTimeMillis(); |
| 453 | stats.setSchemaCount(1); |
| 454 | stats.setSchemaTime(endTime-startTime); |
| 455 | return stats; |
| 456 | } |
| 457 | |
| 458 | /** |
| 459 | * Add a column to a table. |
| 460 | * @param connection The connection object. |
| 461 | * @param tableName The table to drop column from. |
| 462 | * @param columnName The column to create. |
| 463 | * @param columnType The column type to create. |
| 464 | */ |
| 465 | protected TransactionStatistics addColumn(Connection connection, String tableName, |
| 466 | String columnName, String columnType) |
| 467 | { |
| 468 | TransactionStatistics stats = new TransactionStatistics(); |
| 469 | long startTime = System.currentTimeMillis(); |
| 470 | executeUpdate(connection,getAddColumnStatement(tableName,columnName,columnType)); |
| 471 | long endTime = System.currentTimeMillis(); |
| 472 | stats.setSchemaCount(1); |
| 473 | stats.setSchemaTime(endTime-startTime); |
| 474 | return stats; |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * Alter the table. Implementation: Not all databases support |
| 479 | * altering multiple columns, so all columns are separately modified. |
| 480 | * @param connection The connection object. |
| 481 | * @param tableName The table name. |
| 482 | * @param removedAttributes Attribute names which should be removed. |
| 483 | * @param addedAttributes Attribute names which should be added. |
| 484 | * @param attributeTypes Types in form of Classes to given names. |
| 485 | */ |
| 486 | protected TransactionStatistics alterTable(Connection connection, String tableName, |
| 487 | List removedAttributes, List addedAttributes, Map attributeTypes, List keyAttributeNames) |
| 488 | { |
| 489 | TransactionStatistics stats = new TransactionStatistics(); |
| 490 | if ( (removedAttributes.size()==0) && (addedAttributes.size()==0) ) |
| 491 | { |
| 492 | logger.debug("table '"+tableName+"' schema matches class, no modification required."); |
| 493 | return stats; |
| 494 | } |
| 495 | logger.debug("table layout mismatch for table '"+tableName+"': removed columns: "+removedAttributes+", added columns: "+addedAttributes); |
| 496 | // Assemble statements and execute them |
| 497 | for ( int i=0; i<removedAttributes.size(); i++ ) |
| 498 | { |
| 499 | String attributeName = (String) removedAttributes.get(i); |
| 500 | stats.add(dropColumn(connection,tableName,attributeName)); |
| 501 | } |
| 502 | for ( int i=0; i<addedAttributes.size(); i++ ) |
| 503 | { |
| 504 | String attributeName = (String) addedAttributes.get(i); |
| 505 | String sqlTypeName = getSQLTypeName(getSQLType((Class)attributeTypes.get(addedAttributes.get(i)))); |
| 506 | stats.add(addColumn(connection,tableName,attributeName,sqlTypeName)); |
| 507 | } |
| 508 | // Create initial indexes (currently all new attributes will be indexed) |
| 509 | HashMap addedTypes = new HashMap(); |
| 510 | for ( int i=0; i<addedAttributes.size(); i++ ) |
| 511 | { |
| 512 | Object name = addedAttributes.get(i); |
| 513 | addedTypes.put(name,attributeTypes.get(name)); |
| 514 | } |
| 515 | stats.add(createIndexes(connection, tableName, addedTypes)); |
| 516 | return stats; |
| 517 | } |
| 518 | |
| 519 | /** |
| 520 | * Get index creation statement for a given table and field. |
| 521 | * @return The statement to use, or null, of no such index can be |
| 522 | * created. |
| 523 | */ |
| 524 | protected String getCreateIndexStatement(String indexName,String tableName, String field, |
| 525 | Class fieldClass) |
| 526 | { |
| 527 | if ( fieldClass.equals(byte[].class) ) |
| 528 | return null; |
| 529 | return "create index "+indexName+" on "+tableName+" ("+field+")"; |
| 530 | } |
| 531 | |
| 532 | /** |
| 533 | * Get an unused index name. |
| 534 | */ |
| 535 | protected String getCreateIndexName(Connection connection, String tableName, |
| 536 | String field) |
| 537 | { |
| 538 | try |
| 539 | { |
| 540 | // Get max length |
| 541 | DatabaseMetaData dmd = connection.getMetaData(); |
| 542 | int maxTableNameLength = dmd.getMaxTableNameLength(); |
| 543 | if ( maxTableNameLength == 0 ) |
| 544 | maxTableNameLength = Integer.MAX_VALUE; |
| 545 | // Check whether trivial name is good enough |
| 546 | String result = tableName+"_idx_"+field; |
| 547 | if ( result.length() <= maxTableNameLength ) |
| 548 | return result; |
| 549 | // Assemble all indexes to table |
| 550 | HashSet indexNames = new HashSet(); |
| 551 | ResultSet rs = dmd.getIndexInfo(null,null,tableName,false,true); |
| 552 | while ( rs.next() ) |
| 553 | { |
| 554 | String indexName = rs.getString("INDEX_NAME"); |
| 555 | if ( indexName != null ) |
| 556 | indexNames.add(indexName.toLowerCase()); |
| 557 | } |
| 558 | rs.close(); |
| 559 | // Create an index name which does not currently exist |
| 560 | if ( logger.isDebugEnabled() ) |
| 561 | logger.debug("creating index name, existing indexes: "+indexNames); |
| 562 | result = result.substring(0,maxTableNameLength-4).toLowerCase(); |
| 563 | int nameIndex = 1; |
| 564 | while ( indexNames.contains(result+nameIndex) ) |
| 565 | nameIndex++; |
| 566 | // Return abbr. name |
| 567 | logger.debug("new index name: "+result+nameIndex); |
| 568 | return result+nameIndex; |
| 569 | } catch ( SQLException e ) { |
| 570 | throw new StoreException("Could not compute approriate index name.",e); |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | /** |
| 575 | * Create indexes to the given attributes. |
| 576 | * @param connection The SQL connection. |
| 577 | * @param tableName The table to create indexes to. |
| 578 | * @param attributeTypes The attributes and their types to create indexes to. |
| 579 | */ |
| 580 | protected TransactionStatistics createIndexes(Connection connection, String tableName, |
| 581 | Map attributeTypes) |
| 582 | { |
| 583 | TransactionStatistics stats = new TransactionStatistics(); |
| 584 | Iterator entries = attributeTypes.entrySet().iterator(); |
| 585 | while ( entries.hasNext() ) |
| 586 | { |
| 587 | Map.Entry entry = (Map.Entry) entries.next(); |
| 588 | String indexName = getCreateIndexName(connection,tableName,entry.getKey().toString()); |
| 589 | String statement = getCreateIndexStatement(indexName,tableName, |
| 590 | entry.getKey().toString(), (Class) entry.getValue()); |
| 591 | if ( statement != null ) |
| 592 | { |
| 593 | long startTime = System.currentTimeMillis(); |
| 594 | executeUpdate(connection,statement); |
| 595 | long endTime = System.currentTimeMillis(); |
| 596 | stats.setSchemaCount(stats.getSchemaCount()+1); |
| 597 | stats.setSchemaTime(stats.getSchemaTime()+(endTime-startTime)); |
| 598 | } |
| 599 | } |
| 600 | return stats; |
| 601 | } |
| 602 | |
| 603 | /** |
| 604 | * Get the data types of a given table. |
| 605 | * @return A map of names with the sql type number as value. |
| 606 | */ |
| 607 | protected HashMap getTableAttributeTypes(Connection connection, |
| 608 | String tableName) |
| 609 | throws SQLException |
| 610 | { |
| 611 | DatabaseMetaData dmd = connection.getMetaData(); |
| 612 | ResultSet rs = dmd.getColumns(null,null,tableName,null); |
| 613 | HashMap databaseAttributeTypes = new HashMap(); |
| 614 | while ( rs.next() ) |
| 615 | { |
| 616 | // The tablename was a wildcard, so make sure that we |
| 617 | // get the right table's column (thanks Daniel) |
| 618 | if ( rs.getString("TABLE_NAME").equalsIgnoreCase(tableName) ) |
| 619 | { |
| 620 | int type = getTableAttributeType(rs); |
| 621 | databaseAttributeTypes.put(rs.getObject("COLUMN_NAME").toString().toLowerCase(),new Integer(type)); |
| 622 | } |
| 623 | } |
| 624 | rs.close(); |
| 625 | return databaseAttributeTypes; |
| 626 | } |
| 627 | |
| 628 | /** |
| 629 | * Override this method to get different types for attributes than |
| 630 | * the database reports. |
| 631 | */ |
| 632 | protected int getTableAttributeType(ResultSet rs) |
| 633 | throws SQLException |
| 634 | { |
| 635 | return rs.getInt("DATA_TYPE"); |
| 636 | } |
| 637 | |
| 638 | /** |
| 639 | * Ensure that table exists in database. Implementation does |
| 640 | * not check keys. If keys differ, this implementation will not correct |
| 641 | * the problem. Column renames are not detected, if a column is renamed, |
| 642 | * the old column will be dropped and a new column will be created. |
| 643 | * @param tableName The table to check. |
| 644 | * @param attributeTypes The attribute names together with which |
| 645 | * java class they should hold. |
| 646 | * @param keyAttributeNames The keys of table. |
| 647 | */ |
| 648 | protected TransactionStatistics ensureTable(Connection connection, String tableName, |
| 649 | Map attributeTypes, List keyAttributeNames, boolean create) |
| 650 | { |
| 651 | TransactionStatistics stats = new TransactionStatistics(); |
| 652 | try |
| 653 | { |
| 654 | if ( create ) |
| 655 | { |
| 656 | // Query whether table exists |
| 657 | HashMap databaseAttributeTypes = getTableAttributeTypes(connection,tableName); |
| 658 | // Diff the database schema and attribute schema |
| 659 | logger.debug("comparing database schema with class, database has: "+databaseAttributeTypes+", class has: "+attributeTypes); |
| 660 | if ( databaseAttributeTypes.size() == 0 ) |
| 661 | { |
| 662 | // No columns found, better create that table |
| 663 | logger.debug("table '"+tableName+"' did not exist, creating."); |
| 664 | stats.add(createTable(connection,tableName,attributeTypes,keyAttributeNames)); |
| 665 | } else { |
| 666 | // Columns found, so make diff |
| 667 | // Note, that not only removed and added columns count, but |
| 668 | // also columns which types have changed, since that also |
| 669 | // means deleting and adding the column |
| 670 | ArrayList removedAttributes = new ArrayList(databaseAttributeTypes.keySet()); |
| 671 | removedAttributes.removeAll(attributeTypes.keySet()); |
| 672 | ArrayList addedAttributes = new ArrayList(attributeTypes.keySet()); |
| 673 | addedAttributes.removeAll(databaseAttributeTypes.keySet()); |
| 674 | ArrayList changedAttributes = new ArrayList(databaseAttributeTypes.keySet()); |
| 675 | changedAttributes.retainAll(attributeTypes.keySet()); |
| 676 | Iterator changedAttributesIterator = changedAttributes.iterator(); |
| 677 | while ( changedAttributesIterator.hasNext() ) |
| 678 | { |
| 679 | String attribute = (String) changedAttributesIterator.next().toString(); |
| 680 | if ( getSQLTypeName(((Integer) databaseAttributeTypes.get(attribute)).intValue()).equals( |
| 681 | getSQLTypeName(getSQLType((Class) attributeTypes.get(attribute)))) ) |
| 682 | changedAttributesIterator.remove(); // Remove if type matches |
| 683 | } |
| 684 | removedAttributes.addAll(changedAttributes); |
| 685 | addedAttributes.addAll(changedAttributes); |
| 686 | // If all columns are to be removed, drop the table and re-create |
| 687 | // it, or else first drop the old columns and add the new ones |
| 688 | databaseAttributeTypes.remove("persistence_id"); |
| 689 | databaseAttributeTypes.remove("persistence_start"); |
| 690 | databaseAttributeTypes.remove("persistence_end"); |
| 691 | databaseAttributeTypes.remove("persistence_txend"); |
| 692 | databaseAttributeTypes.remove("persistence_txstart"); |
| 693 | databaseAttributeTypes.remove("persistence_txstartid"); |
| 694 | databaseAttributeTypes.remove("persistence_txendid"); |
| 695 | if ( (removedAttributes.size() == databaseAttributeTypes.size()) && |
| 696 | (removedAttributes.size()>0) ) |
| 697 | { |
| 698 | // Uh-oh, all attributes changed, re-create table |
| 699 | logger.debug("table '"+tableName+"' will be re-created, because all "+ |
| 700 | "attributes changed apparently, removed: "+removedAttributes+", added: "+addedAttributes); |
| 701 | stats.add(dropTable(connection,tableName)); |
| 702 | stats.add(createTable(connection,tableName,attributeTypes,keyAttributeNames)); |
| 703 | } else if ( (removedAttributes.size()>0) || (addedAttributes.size()>0) ) { |
| 704 | // Partial change, only change what is necessary |
| 705 | logger.debug("table '"+tableName+"' has a partial change, removing: "+removedAttributes+", adding: "+addedAttributes); |
| 706 | stats.add(alterTable(connection,tableName,removedAttributes,addedAttributes,attributeTypes, keyAttributeNames)); |
| 707 | } else { |
| 708 | logger.debug("nothing to change on table: "+tableName); |
| 709 | } |
| 710 | } |
| 711 | } else { |
| 712 | logger.debug("table is not to be created: "+tableName); |
| 713 | } |
| 714 | // Remember these attributes |
| 715 | setAttributes(tableName,attributeTypes); |
| 716 | } catch ( Exception e ) { |
| 717 | throw new StoreException("could not ensure table exists: "+tableName,e); |
| 718 | } |
| 719 | // Return |
| 720 | return stats; |
| 721 | } |
| 722 | |
| 723 | /** |
| 724 | * Get the limit component of statement, if it can be expressed in |
| 725 | * the current database with simple statement part. |
| 726 | * @param limits The limits to apply. |
| 727 | */ |
| 728 | protected String getLimitStatement(String statement, Limits limits, List types) |
| 729 | { |
| 730 | return statement; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * Get the count statement for the given statement. |
| 735 | */ |
| 736 | protected String getCountStatement(String stmt) |
| 737 | { |
| 738 | return "select count(*) from ("+stmt+") as cr"; |
| 739 | } |
| 740 | |
| 741 | /** |
| 742 | * Get the table declaration for a select statment. |
| 743 | */ |
| 744 | protected String getTableDeclaration(String tableName, String alias) |
| 745 | { |
| 746 | if ( alias == null ) |
| 747 | return tableName; |
| 748 | else |
| 749 | return tableName+" as "+alias; |
| 750 | } |
| 751 | |
| 752 | /** |
| 753 | * Assemble the query columns of a given term. |
| 754 | */ |
| 755 | protected String getQuerySource(TableTerm term, Set queryColumns, List types) |
| 756 | { |
| 757 | // Determine name |
| 758 | String name = term.getName(); |
| 759 | // List all attributes one-by-one |
| 760 | StringBuffer result = new StringBuffer(); |
| 761 | Map attributeTypes = getAttributes(term.getTableName()); |
| 762 | if ( attributeTypes == null ) |
| 763 | throw new StoreException("attributes types not present for table: "+term.getTableName()+", map: "+tableAttributes.keySet()); |
| 764 | Iterator attributeEntryIterator = attributeTypes.entrySet().iterator(); |
| 765 | while ( attributeEntryIterator.hasNext() ) |
| 766 | { |
| 767 | Map.Entry entry = (Map.Entry) attributeEntryIterator.next(); |
| 768 | String attributeName = (String) entry.getKey(); |
| 769 | Class attributeType = (Class) entry.getValue(); |
| 770 | if ( ! attributeName.startsWith("persistence_") ) |
| 771 | { |
| 772 | result.append(name+"."+attributeName+","); |
| 773 | types.add(attributeType); |
| 774 | checkAttribute(queryColumns,attributeName); |
| 775 | } |
| 776 | } |
| 777 | if ( (result.length()>0) && (result.charAt(result.length()-1)==',') ) |
| 778 | result.deleteCharAt(result.length()-1); |
| 779 | return result.toString(); |
| 780 | } |
| 781 | |
| 782 | /** |
| 783 | * Check the attribute whether it's already contained in the |
| 784 | * columns. |
| 785 | */ |
| 786 | private void checkAttribute(Set queryColumns, String attributeName) |
| 787 | { |
| 788 | if ( ! queryColumns.add(attributeName) ) |
| 789 | throw new StoreException("query has multiple columns with same name, try to add: "+attributeName+", attributes until now: "+queryColumns); |
| 790 | } |
| 791 | |
| 792 | /** |
| 793 | * Assemble the query columns of select statement. |
| 794 | * @param stmt The statement to get query source from. |
| 795 | * @param types The type list to fill in. Each queried column's |
| 796 | * type should be inserted into this list in order. |
| 797 | * @return The columns part of the select statement. |
| 798 | */ |
| 799 | protected String getQuerySource(QueryStatement stmt, List types) |
| 800 | { |
| 801 | if ( logger.isDebugEnabled() ) |
| 802 | logger.debug("computing query source from: "+stmt.getSelectTerms()); |
| 803 | HashSet queryColumns = new HashSet(); |
| 804 | StringBuffer querySource = new StringBuffer(); |
| 805 | for ( int i=0; i<stmt.getSelectTerms().size(); i++ ) |
| 806 | { |
| 807 | if ( querySource.length() > 0 ) |
| 808 | querySource.append(","); |
| 809 | TableTerm term = (TableTerm) stmt.getSelectTerms().get(i); |
| 810 | if ( term instanceof ReferenceTerm ) |
| 811 | { |
| 812 | logger.debug("adding reference term: "+term); |
| 813 | // This is specifically an attribute |
| 814 | ReferenceTerm refTerm = (ReferenceTerm) term; |
| 815 | querySource.append(refTerm.getExpression()); |
| 816 | if ( refTerm.getColumnAlias() != null ) |
| 817 | { |
| 818 | querySource.append(" as "+refTerm.getColumnAlias()); |
| 819 | checkAttribute(queryColumns,refTerm.getColumnAlias()); |
| 820 | } else { |
| 821 | checkAttribute(queryColumns,refTerm.getColumnName()); |
| 822 | } |
| 823 | Class attributeType = getAttributeType(term.getTableName(), |
| 824 | ((ReferenceTerm)term).getColumnName()); |
| 825 | types.add(attributeType); |
| 826 | } else { |
| 827 | SpecifiedTableTerm specifiedTerm = |
| 828 | stmt.getSpecifiedTerm(term); // Switch for specified term |
| 829 | if ( logger.isDebugEnabled() ) |
| 830 | logger.debug("adding table term: "+specifiedTerm); |
| 831 | // This is a table |
| 832 | querySource.append(getQuerySource(specifiedTerm,queryColumns,types)); |
| 833 | for ( int o=0; o<specifiedTerm.getRelatedLeftTerms().size(); o++ ) |
| 834 | { |
| 835 | TableTerm leftTableTerm = |
| 836 | ((SpecifiedTableTerm.LeftjoinEntry) |
| 837 | specifiedTerm.getRelatedLeftTerms().get(o)).term; |
| 838 | String sourcePart = getQuerySource(leftTableTerm,queryColumns,types); |
| 839 | if ( sourcePart.length() > 0 ) |
| 840 | { |
| 841 | if ( querySource.length()>0 ) |
| 842 | querySource.append(","); |
| 843 | querySource.append(sourcePart); |
| 844 | } |
| 845 | } |
| 846 | } |
| 847 | } |
| 848 | // Add persistence id/startserial/endserial |
| 849 | TableTerm firstTerm = null; |
| 850 | if ( stmt.getSelectTerms().size()>0 ) |
| 851 | firstTerm = (TableTerm) stmt.getSelectTerms().get(0); |
| 852 | if ( (!"tablemap".equalsIgnoreCase(firstTerm.getTableName())) && |
| 853 | (!"classes".equalsIgnoreCase(firstTerm.getTableName())) && |
| 854 | (!"nodes".equalsIgnoreCase(firstTerm.getTableName())) && |
| 855 | (stmt.getMode()!=QueryStatement.MODE_VIEW) ) |
| 856 | { |
| 857 | // Add persistence id |
| 858 | if ( querySource.length()>0 ) |
| 859 | querySource.append(","); |
| 860 | querySource.append(firstTerm.getName()+".persistence_id"); |
| 861 | types.add(Long.class); |
| 862 | // Add serials |
| 863 | ArrayList terms = new ArrayList(); |
| 864 | terms.add(firstTerm); |
| 865 | terms.addAll(stmt.getSpecifiedTerm(firstTerm).getRelatedLeftTerms()); |
| 866 | for ( int i=0; i<terms.size(); i++ ) |
| 867 | { |
| 868 | querySource.append(","); |
| 869 | querySource.append(firstTerm.getName()+".persistence_start as persistence_start"+i); |
| 870 | types.add(Long.class); |
| 871 | querySource.append(","); |
| 872 | querySource.append(firstTerm.getName()+".persistence_end as persistence_end"+i); |
| 873 | types.add(Long.class); |
| 874 | } |
| 875 | } |
| 876 | // Return |
| 877 | return querySource.toString(); |
| 878 | } |
| 879 | |
| 880 | /** |
| 881 | * Transform the select terms. |
| 882 | */ |
| 883 | protected List transformTerms(List terms) |
| 884 | { |
| 885 | return terms; |
| 886 | } |
| 887 | |
| 888 | /** |
| 889 | * Transform the expression. This method is called on each subsequent |
| 890 | * expressions too, so implementation does not have to be recursive. |
| 891 | * @param expr The expression to possibly transform. |
| 892 | * @return A transformed expression. |
| 893 | */ |
| 894 | protected Expression transformExpression(Expression expr) |
| 895 | { |
| 896 | return expr; |
| 897 | } |
| 898 | |
| 899 | /** |
| 900 | * Checks whether a list of table terms contains a given reference term, |
| 901 | * but not by using the standard <code>equals()</code> method, but by |
| 902 | * comparing a reference term with own equality. |
| 903 | */ |
| 904 | private boolean containsReferenceTerm(List terms, ReferenceTerm term) |
| 905 | { |
| 906 | for ( int i=0; i<terms.size(); i++ ) |
| 907 | { |
| 908 | TableTerm objRaw = (TableTerm) terms.get(i); |
| 909 | if ( objRaw instanceof ReferenceTerm ) |
| 910 | { |
| 911 | ReferenceTerm obj = (ReferenceTerm) objRaw; |
| 912 | if ( (obj.equals(term)) && (obj.getColumnName().equals(term.getColumnName())) ) |
| 913 | return true; |
| 914 | } |
| 915 | } |
| 916 | return false; |
| 917 | } |
| 918 | |
| 919 | /** |
| 920 | * Walk the given expression tree, and produce and sql expression. |
| 921 | * @param expression The beankeeper expression to process. |
| 922 | * @param values All constants which have a placeholder in the sql |
| 923 | * expression will be appended to this list in order. |
| 924 | * @return An SQL expression matching the given beankeeper expression. |
| 925 | */ |
| 926 | private String getExpression(Expression expression, List values) |
| 927 | { |
| 928 | if ( logger.isDebugEnabled() ) |
| 929 | logger.debug("expression, that will be translated to sql: "+expression); |
| 930 | StringBuffer conditionPart = new StringBuffer(); |
| 931 | Stack openNodes = new Stack(); // Used in traversing the expression tree |
| 932 | if ( expression != null ) |
| 933 | openNodes.push(new ArrayList(transformExpression(expression))); |
| 934 | while ( ! openNodes.isEmpty() ) |
| 935 | { |
| 936 | // Select the current expression part list |
| 937 | ArrayList parts = (ArrayList) openNodes.peek(); |
| 938 | // If there are no parts, then return |
| 939 | if ( parts.size() == 0 ) |
| 940 | { |
| 941 | openNodes.pop(); |
| 942 | if ( ! openNodes.isEmpty() ) |
| 943 | conditionPart.append(")"); // Close sub-expression |
| 944 | continue; // 20 goto 10 |
| 945 | } |
| 946 | // Process the most left symbol |
| 947 | Object nextPart = parts.remove(0); |
| 948 | // There are basically 4 cases depending on the class of nextPart |
| 949 | if ( nextPart instanceof Expression ) |
| 950 | { |
| 951 | // It is an expression, so start new block and push expression |
| 952 | // items |
| 953 | conditionPart.append("("); |
| 954 | openNodes.push(new ArrayList(transformExpression((Expression) nextPart))); |
| 955 | } |
| 956 | if ( nextPart instanceof String ) |
| 957 | { |
| 958 | // It is an operator, so just append |
| 959 | conditionPart.append(" "+nextPart.toString()+" "); |
| 960 | } |
| 961 | if ( nextPart instanceof ConstantTerm ) |
| 962 | { |
| 963 | // It is a constant, add ? and remember value |
| 964 | Object value = ((ConstantTerm) nextPart).getValue(); |
| 965 | if ( value instanceof Collection ) |
| 966 | { |
| 967 | if ( logger.isDebugEnabled() ) |
| 968 | logger.debug("detected collection constant value: "+value); |
| 969 | // Add multiple values as an enumeration |
| 970 | Iterator valueIterator = ((Collection) value).iterator(); |
| 971 | conditionPart.append(" ("); |
| 972 | while ( valueIterator.hasNext() ) |
| 973 | { |
| 974 | Object singleValue = valueIterator.next(); |
| 975 | if ( singleValue == null ) |
| 976 | { |
| 977 | conditionPart.append("null,"); |
| 978 | } else { |
| 979 | conditionPart.append("?,"); |
| 980 | values.add(singleValue); |
| 981 | } |
| 982 | } |
| 983 | if ( conditionPart.charAt(conditionPart.length()-1) == ',' ) |
| 984 | conditionPart.delete(conditionPart.length()-1,conditionPart.length()); |
| 985 | conditionPart.append(") "); |
| 986 | } else { |
| 987 | if ( logger.isDebugEnabled() ) |
| 988 | logger.debug("detected single constant value: "+value); |
| 989 | // Add a single value |
| 990 | if ( value == null ) |
| 991 | { |
| 992 | conditionPart.append(" null "); |
| 993 | } else { |
| 994 | conditionPart.append(" ? "); |
| 995 | values.add(value); |
| 996 | } |
| 997 | } |
| 998 | } |
| 999 | if ( nextPart instanceof ReferenceTerm ) |
| 1000 | { |
| 1001 | if ( logger.isDebugEnabled() ) |
| 1002 | logger.debug("adding reference term: "+nextPart); |
| 1003 | // It is a reference type, remember name |
| 1004 | ReferenceTerm term = (ReferenceTerm) nextPart; |
| 1005 | conditionPart.append(term.getExpression()+" "); |
| 1006 | } |
| 1007 | } |
| 1008 | return conditionPart.toString(); |
| 1009 | } |
| 1010 | |
| 1011 | /** |
| 1012 | * Select objects from database as ordered list of attribute maps. |
| 1013 | * @param connection The connection to run statements in. |
| 1014 | * @param stmt The query statement. |
| 1015 | * @param limits The limits of the result. (Offset, maximum result count) |
| 1016 | * @param result The result object. |
| 1017 | */ |
| 1018 | protected TransactionStatistics search(Connection connection, |
| 1019 | QueryStatement stmt, Limits limits, SearchResult searchResult) |
| 1020 | { |
| 1021 | TransactionStatistics stats = new TransactionStatistics(); |
| 1022 | Expression expression = stmt.getQueryExpression(); |
| 1023 | List orderBys = stmt.getOrderByList(); |
| 1024 | List<ReferenceTerm> groupBys = stmt.getGroupByList(); |
| 1025 | Expression havingExpression = stmt.getHavingExpression(); |
| 1026 | // Assemble statement: |
| 1027 | // - Create query source sql |
| 1028 | // - Parse expression create sql |
| 1029 | // - Create statement without orderbys and limits |
| 1030 | // - Run count statement to determine full count |
| 1031 | // - Apply limits and orderbys to statement |
| 1032 | // - Run statement to get results |
| 1033 | |
| 1034 | // Transform statement to fit database |
| 1035 | stmt.setSelectTerms(transformTerms(stmt.getSelectTerms())); |
| 1036 | // Compute query columns and tables |
| 1037 | ArrayList types = new ArrayList(); |
| 1038 | String querySource = getQuerySource(stmt,types); |
| 1039 | if ( logger.isDebugEnabled() ) |
| 1040 | logger.debug("query source: "+querySource+", type vector: "+types+", select terms: "+stmt.getSelectTerms()); |
| 1041 | // Determine whether select will be distinct. Currently it is _not_ |
| 1042 | // distinct if some field returned would be blob type. |
| 1043 | boolean isDistinct = ! types.contains(byte[].class); |
| 1044 | // Create tables full part (with left joins) |
| 1045 | if ( logger.isDebugEnabled() ) |
| 1046 | logger.debug("creating tables part from specified terms: "+stmt.getSpecifiedTerms()); |
| 1047 | ArrayList statementValues = new ArrayList(); // Will hold values for '?' signs in-order |
| 1048 | StringBuffer tablesPart = new StringBuffer(); |
| 1049 | Iterator tableIterator = stmt.getSpecifiedTerms().iterator(); |
| 1050 | while ( tableIterator.hasNext() ) |
| 1051 | { |
| 1052 | SpecifiedTableTerm tableTerm = (SpecifiedTableTerm) tableIterator.next(); |
| 1053 | tablesPart.append(getTableDeclaration(tableTerm.getTableName(),tableTerm.getAlias())); |
| 1054 | // This is a selected table, so include left terms |
| 1055 | for ( int i=0; i<tableTerm.getRelatedLeftTerms().size(); i++ ) |
| 1056 | { |
| 1057 | SpecifiedTableTerm.LeftjoinEntry joinEntry = (SpecifiedTableTerm.LeftjoinEntry) |
| 1058 | tableTerm.getRelatedLeftTerms().get(i); |
| 1059 | tablesPart.append(" left join "); |
| 1060 | tablesPart.append(getTableDeclaration(joinEntry.term.getTableName(), |
| 1061 | joinEntry.term.getAlias())); |
| 1062 | tablesPart.append(" on ("+getExpression(joinEntry.expression,statementValues)+")"); |
| 1063 | } |
| 1064 | // Add other left-joined tables on other specific attributes |
| 1065 | for ( int i=0; i<tableTerm.getReferencedLeftTerms().size(); i++ ) |
| 1066 | { |
| 1067 | SpecifiedTableTerm.LeftjoinEntry joinEntry = (SpecifiedTableTerm.LeftjoinEntry) |
| 1068 | tableTerm.getReferencedLeftTerms().get(i); |
| 1069 | tablesPart.append(" left join "); |
| 1070 | tablesPart.append(getTableDeclaration(joinEntry.term.getTableName(), |
| 1071 | joinEntry.term.getAlias())); |
| 1072 | tablesPart.append(" on ("+getExpression(joinEntry.expression,statementValues)+")"); |
| 1073 | } |
| 1074 | // Comma |
| 1075 | tablesPart.append(","); |
| 1076 | } |
| 1077 | tablesPart.delete(tablesPart.length()-1,tablesPart.length()); |
| 1078 | // So first, parse conditions, also compute the conditions string |
| 1079 | // in the process. This could be easily written in a recursive |
| 1080 | // algorithm, but there are too many dependencies. |
| 1081 | StringBuffer conditionPart = new StringBuffer(); // Will hold the where statement |
| 1082 | if ( (expression != null) && (expression.size()>0) ) |
| 1083 | { |
| 1084 | conditionPart.append(" where "); |
| 1085 | conditionPart.append(getExpression(expression,statementValues)); |
| 1086 | } |
| 1087 | // Calculate group by part |
| 1088 | if ( (groupBys!=null) && (!groupBys.isEmpty()) ) |
| 1089 | { |
| 1090 | if ( logger.isDebugEnabled() ) |
| 1091 | logger.debug("will use group by list: "+groupBys); |
| 1092 | conditionPart.append(" group by"); |
| 1093 | for ( ReferenceTerm term : groupBys ) |
| 1094 | conditionPart.append(" "+term.getExpression()+","); |
| 1095 | conditionPart.delete(conditionPart.length()-1,conditionPart.length()); |
| 1096 | } |
| 1097 | // Calculate 'having' part |
| 1098 | if ( (havingExpression!=null) && (!havingExpression.isEmpty()) ) |
| 1099 | { |
| 1100 | conditionPart.append(" having "); |
| 1101 | conditionPart.append(getExpression(havingExpression,statementValues)); |
| 1102 | } |
| 1103 | // Calculate order by |
| 1104 | StringBuffer orderByTerm = new StringBuffer(); |
| 1105 | if ( (orderBys!=null) && (orderBys.size() > 0) ) |
| 1106 | { |
| 1107 | if ( logger.isDebugEnabled() ) |
| 1108 | logger.debug("will use order by list: "+orderBys); |
| 1109 | orderByTerm.append(" order by "); |
| 1110 | for ( int i=0; i<orderBys.size(); i++ ) |
| 1111 | { |
| 1112 | OrderBy orderBy = (OrderBy) orderBys.get(i); |
| 1113 | ReferenceTerm orderReferenceTerm = new ReferenceTerm(orderBy.getReferenceTerm()); |
| 1114 | if ( |
| 1115 | ( (stmt.getMode()==QueryStatement.MODE_FIND) && |
| 1116 | (! stmt.getSelectTerms().contains(orderBy.getReferenceTerm())) ) || |
| 1117 | ( (stmt.getMode()==QueryStatement.MODE_VIEW) && |
| 1118 | (! containsReferenceTerm(stmt.getSelectTerms(),orderBy.getReferenceTerm())) ) |
| 1119 | ) |
| 1120 | { |
| 1121 | // Order by is not referencing the main tables. To maintain |
| 1122 | // distinct select, we must add this attribute to result |
| 1123 | querySource += ","+orderReferenceTerm.getExpression()+" as ordercol"+i; |
| 1124 | orderReferenceTerm.setColumnAlias("ordercol"+i); |
| 1125 | Class attributeType = getAttributeType(orderReferenceTerm.getTableName(), |
| 1126 | orderReferenceTerm.getColumnName()); |
| 1127 | types.add(attributeType); |
| 1128 | } |
| 1129 | // Add to order term |
| 1130 | if ( orderReferenceTerm.getColumnAlias() != null ) |
| 1131 | orderByTerm.append(orderReferenceTerm.getColumnAlias()); |
| 1132 | else |
| 1133 | orderByTerm.append(orderReferenceTerm.getExpression()); |
| 1134 | orderByTerm.append(orderBy.getDirection()==OrderBy.ASCENDING?" asc,":" desc,"); |
| 1135 | } |
| 1136 | orderByTerm.delete(orderByTerm.length()-1,orderByTerm.length()); |
| 1137 | } |
| 1138 | if ( logger.isDebugEnabled() ) |
| 1139 | logger.debug("select types: "+types); |
| 1140 | // Create count statement |
| 1141 | StringBuffer subStatement = new StringBuffer("select "+(isDistinct?"distinct ":"")+querySource+" from "); |
| 1142 | subStatement.append(tablesPart.toString()); |
| 1143 | subStatement.append(conditionPart.toString()); |
| 1144 | StringBuffer statement = new StringBuffer(getCountStatement(subStatement.toString())); |
| 1145 | logger.debug("preparing counting statement: "+statement.toString()); |
| 1146 | String countStatement = statement.toString(); |
| 1147 | // Prepare count statement |
| 1148 | PreparedStatement countPstmt; |
| 1149 | try |
| 1150 | { |
| 1151 | countPstmt = connection.prepareStatement(countStatement); |
| 1152 | for ( int i=0; i<statementValues.size(); i++ ) |
| 1153 | { |
| 1154 | Object value = getSQLValue(statementValues.get(i)); |
| 1155 | logger.debug("setting statement parameter #"+i+": "+value); |
| 1156 | sqlLogger.debug("setting statement parameter #"+i+": "+value); |
| 1157 | countPstmt.setObject(i+1,value); |
| 1158 | } |
| 1159 | } catch ( Exception e ) { |
| 1160 | throw new StoreException("cannot prepare statement: "+statement.toString(),e); |
| 1161 | } |
| 1162 | // Now create full statement (add order and limit) |
| 1163 | statement = new StringBuffer("select "+(isDistinct?"distinct ":"")+querySource+" from "); |
| 1164 | statement.append(tablesPart.toString()); |
| 1165 | statement.append(conditionPart.toString()); |
| 1166 | statement.append(orderByTerm.toString()); |
| 1167 | // Add limits |
| 1168 | if ( limits != null ) |
| 1169 | statement = new StringBuffer(getLimitStatement(statement.toString(),limits,types)); |
| 1170 | // Run statement |
| 1171 | ArrayList result = new ArrayList(); |
| 1172 | PreparedStatement pstmt = null; |
| 1173 | if ( (limits==null) || (!limits.isEmpty()) ) |
| 1174 | { |
| 1175 | // Prepare |
| 1176 | try |
| 1177 | { |
| 1178 | pstmt = connection.prepareStatement(statement.toString()); |
| 1179 | for ( int i=0; i<statementValues.size(); i++ ) |
| 1180 | { |
| 1181 | Object value = getSQLValue(statementValues.get(i)); |
| 1182 | logger.debug("setting statement parameter #"+i+": "+value); |
| 1183 | sqlLogger.debug("setting statement parameter #"+i+": "+value); |
| 1184 | pstmt.setObject(i+1,value); |
| 1185 | } |
| 1186 | } catch ( Exception e ) { |
| 1187 | throw new StoreException("cannot prepare statement: "+statement.toString(),e); |
| 1188 | } |
| 1189 | // Execute |
| 1190 | try |
| 1191 | { |
| 1192 | sqlLogger.debug("running select statement: "+statement.toString()); |
| 1193 | long startTime = System.currentTimeMillis(); |
| 1194 | prepareStatement(pstmt,limits); |
| 1195 | ResultSet rs = pstmt.executeQuery(); |
| 1196 | long endTime = System.currentTimeMillis(); |
| 1197 | aggregatorLogger.log("Query statement execution",new int[] { (int) (endTime-startTime) }); |
| 1198 | stats.setSelectCount(stats.getSelectCount()+1); |
| 1199 | stats.setSelectTime(stats.getSelectTime()+(endTime-startTime)); |
| 1200 | ResultSetMetaData rsmd = rs.getMetaData(); |
| 1201 | // Get result and pack the attributes into a map |
| 1202 | prepareResultSet(rs,limits); |
| 1203 | while ( rs.next() ) |
| 1204 | { |
| 1205 | Map attributes = new HashMap(); |
| 1206 | for ( int i=0; i<rsmd.getColumnCount(); i++ ) |
| 1207 | { |
| 1208 | String columnName = rsmd.getColumnName(i+1).toLowerCase(); |
| 1209 | Object columnValue = getJavaValue(rs.getObject(i+1),rsmd.getColumnType(i+1),(Class) types.get(i)); |
| 1210 | if ( columnName.startsWith("persistence_start") ) |
| 1211 | { |
| 1212 | // Handle persistence_starts |
| 1213 | Long previousValue = (Long) attributes.get("persistence_start"); |
| 1214 | if ( (previousValue==null) || (previousValue.longValue() < |
| 1215 | ((Long) columnValue).longValue()) ) |
| 1216 | attributes.put("persistence_start",columnValue); |
| 1217 | } else if ( columnName.startsWith("persistence_end") ) { |
| 1218 | // Handle persistence_ends |
| 1219 | Long previousValue = (Long) attributes.get("persistence_end"); |
| 1220 | if ( (previousValue==null) || (previousValue.longValue() > |
| 1221 | ((Long) columnValue).longValue()) ) |
| 1222 | attributes.put("persistence_end",columnValue); |
| 1223 | } else { |
| 1224 | // Normal attributes |
| 1225 | attributes.put(columnName, columnValue); |
| 1226 | } |
| 1227 | } |
| 1228 | result.add(attributes); |
| 1229 | } |
| 1230 | rs.close(); |
| 1231 | } catch ( Exception e ) { |
| 1232 | throw new StoreException("exception while sql select",e); |
| 1233 | } finally { |
| 1234 | try |
| 1235 | { |
| 1236 | pstmt.close(); |
| 1237 | } catch ( Exception e ) { |
| 1238 | logger.debug("unable to close statement",e); |
| 1239 | } |
| 1240 | } |
| 1241 | } // End valid limits (running of query) |
| 1242 | // Execute count statement if necessary |
| 1243 | long resultSize; |
| 1244 | if ( limits == null ) |
| 1245 | { |
| 1246 | // If there are no limits, the result is a full result |
| 1247 | resultSize = result.size(); |
| 1248 | } else if ( limits.getSize()>=0 ) { |
| 1249 | // Size already known (possibly from previous select) |
| 1250 | resultSize = limits.getSize(); |
| 1251 | } else if ( (limits.getLimit()>0) && (result.size()<limits.getLimit()) ) { |
| 1252 | // Count statement not necessary, this is the last page, we can |
| 1253 | // compute the size |
| 1254 | resultSize = limits.getOffset()+result.size(); |
| 1255 | } else { |
| 1256 | // We must get the full size the hard way, so select |
| 1257 | if ( sqlLogger.isDebugEnabled() ) |
| 1258 | sqlLogger.debug("running count statement: "+countStatement); |
| 1259 | try |
| 1260 | { |
| 1261 | long startTime = System.currentTimeMillis(); |
| 1262 | ResultSet rs = countPstmt.executeQuery(); |
| 1263 | long endTime = System.currentTimeMillis(); |
| 1264 | aggregatorLogger.log("Query count statement execution",new int[] { (int) (endTime-startTime) }); |
| 1265 | stats.setSelectCount(stats.getSelectCount()+1); |
| 1266 | stats.setSelectTime(stats.getSelectTime()+(endTime-startTime)); |
| 1267 | rs.next(); |
| 1268 | resultSize = rs.getLong(1); |
| 1269 | rs.close(); |
| 1270 | } catch ( Exception e ) { |
| 1271 | throw new StoreException("exception while sql select count",e); |
| 1272 | } finally { |
| 1273 | try |
| 1274 | { |
| 1275 | countPstmt.close(); |
| 1276 | } catch ( Exception e ) { |
| 1277 | logger.debug("unable to close statement",e); |
| 1278 | } |
| 1279 | } |
| 1280 | } |
| 1281 | // Assemble result and return |
| 1282 | searchResult.setResultSize(resultSize); |
| 1283 | searchResult.setResult(result); |
| 1284 | sqlLogger.debug("returning result, size: "+result.size()+" / "+resultSize); |
| 1285 | return stats; |
| 1286 | } |
| 1287 | |
| 1288 | /** |
| 1289 | * Convert incoming value from database into java format. |
| 1290 | */ |
| 1291 | protected Object getJavaValue(Object value, int type, Class javaType) |
| 1292 | { |
| 1293 | if ( value instanceof Timestamp ) |
| 1294 | return new Date(((Timestamp) value).getTime()); |
| 1295 | return value; |
| 1296 | } |
| 1297 | |
| 1298 | /** |
| 1299 | * Convert incoming values from java into database acceptable format. |
| 1300 | */ |
| 1301 | protected Object getSQLValue(Object value) |
| 1302 | { |
| 1303 | if ( (value!=null) && (value instanceof Date) ) |
| 1304 | return new Timestamp(((Date) value).getTime()); |
| 1305 | return value; |
| 1306 | } |
| 1307 | |
| 1308 | /** |
| 1309 | * Get the class for an sql type. |
| 1310 | */ |
| 1311 | protected String getSQLTypeName(int sqltype) |
| 1312 | { |
| 1313 | switch ( sqltype ) |
| 1314 | { |
| 1315 | case Types.DATE: |
| 1316 | case Types.TIME: |
| 1317 | case Types.TIMESTAMP: |
| 1318 | return "timestamp"; |
| 1319 | case Types.LONGVARCHAR: |
| 1320 | case Types.VARCHAR: |
| 1321 | return "text"; |
| 1322 | case Types.BIT: |
| 1323 | case Types.BOOLEAN: |
| 1324 | return "boolean"; |
| 1325 | case Types.INTEGER: |
| 1326 | case Types.NUMERIC: |
| 1327 | case Types.DECIMAL: |
| 1328 | return "integer"; |
| 1329 | case Types.BIGINT: |
| 1330 | return "bigint"; |
| 1331 | case Types.SMALLINT: |
| 1332 | case Types.TINYINT: |
| 1333 | return "smallint"; |
| 1334 | case Types.DOUBLE: |
| 1335 | case Types.FLOAT: |
| 1336 | case Types.REAL: |
| 1337 | return "float"; |
| 1338 | case Types.CHAR: |
| 1339 | return "char"; |
| 1340 | case Types.BLOB: |
| 1341 | case Types.BINARY: |
| 1342 | case Types.VARBINARY: |
| 1343 | case Types.LONGVARBINARY: |
| 1344 | return "blob"; |
| 1345 | default: |
| 1346 | } |
| 1347 | throw new StoreException("no sql type definition programmed for type: "+sqltype); |
| 1348 | } |
| 1349 | |
| 1350 | /** |
| 1351 | * Get the sql type string for a class. |
| 1352 | */ |
| 1353 | protected int getSQLType(Class type) |
| 1354 | { |
| 1355 | if ( (Date.class.equals(type)) ) |
| 1356 | return Types.TIMESTAMP; |
| 1357 | if ( String.class.equals(type) ) |
| 1358 | return Types.VARCHAR; |
| 1359 | Class booleanClass = boolean.class; |
| 1360 | if ( (booleanClass.equals(type)) || (Boolean.class.equals(type)) ) |
| 1361 | return Types.BOOLEAN; |
| 1362 | Class intClass = int.class; |
| 1363 | if ( (intClass.equals(type)) || (Integer.class.equals(type)) ) |
| 1364 | return Types.INTEGER; |
| 1365 | Class longClass = long.class; |
| 1366 | if ( (longClass.equals(type)) || (Long.class.equals(type)) ) |
| 1367 | return Types.BIGINT; |
| 1368 | Class byteClass = byte.class; |
| 1369 | if ( (byteClass.equals(type)) || (Byte.class.equals(type)) ) |
| 1370 | return Types.SMALLINT; |
| 1371 | if ( byte[].class.equals(type) ) |
| 1372 | return Types.BLOB; |
| 1373 | Class doubleClass = double.class; |
| 1374 | if ( (doubleClass.equals(type)) || (Double.class.equals(type)) ) |
| 1375 | return Types.DOUBLE; |
| 1376 | Class floatClass = float.class; |
| 1377 | if ( (floatClass.equals(type)) || (Float.class.equals(type)) ) |
| 1378 | return Types.FLOAT; |
| 1379 | Class shortClass = short.class; |
| 1380 | if ( (shortClass.equals(type)) || (Short.class.equals(type)) ) |
| 1381 | return Types.SMALLINT; |
| 1382 | Class charClass = char.class; |
| 1383 | if ( (charClass.equals(type)) || (Character.class.equals(type)) ) |
| 1384 | return Types.CHAR; |
| 1385 | throw new StoreException("type: "+type+" is not an allowed primitive type."); |
| 1386 | } |
| 1387 | |
| 1388 | /** |
| 1389 | * Execute update statement. Simply and safely execute the |
| 1390 | * given statement. |
| 1391 | * @param connection The connection to execute statement on. |
| 1392 | * @param statement The statement to execute. |
| 1393 | */ |
| 1394 | protected void executeUpdate(Connection connection, String statement) |
| 1395 | { |
| 1396 | sqlLogger.debug("executing update statement: "+statement); |
| 1397 | // Prepare |
| 1398 | PreparedStatement pstmt; |
| 1399 | try |
| 1400 | { |
| 1401 | pstmt = connection.prepareStatement(statement.toString()); |
| 1402 | } catch ( Exception e ) { |
| 1403 | throw new StoreException("cannot prepare statement: "+statement.toString(),e); |
| 1404 | } |
| 1405 | // Execute |
| 1406 | try |
| 1407 | { |
| 1408 | pstmt.executeUpdate(); |
| 1409 | } catch ( Exception e ) { |
| 1410 | throw new StoreException("exception while executing statement: "+statement,e); |
| 1411 | } finally { |
| 1412 | try |
| 1413 | { |
| 1414 | pstmt.close(); |
| 1415 | } catch ( Exception e ) { |
| 1416 | logger.debug("unable to close statement",e); |
| 1417 | } |
| 1418 | } |
| 1419 | } |
| 1420 | |
| 1421 | /** |
| 1422 | * Prepare the sql statment to be executed. |
| 1423 | */ |
| 1424 | protected void prepareStatement(PreparedStatement pstmt, Limits limits) |
| 1425 | throws SQLException |
| 1426 | { |
| 1427 | } |
| 1428 | |
| 1429 | /** |
| 1430 | * Prepare the result set to be iterated. |
| 1431 | */ |
| 1432 | protected void prepareResultSet(ResultSet rs, Limits limits) |
| 1433 | throws SQLException |
| 1434 | { |
| 1435 | } |
| 1436 | |
| 1437 | } |
| 1438 | |
| 1439 | |