| 1 | package felix.dstruct; |
| 2 | |
| 3 | |
| 4 | import java.sql.Array; |
| 5 | import java.sql.PreparedStatement; |
| 6 | import java.sql.ResultSet; |
| 7 | import java.sql.SQLException; |
| 8 | import java.util.ArrayList; |
| 9 | import java.util.Arrays; |
| 10 | import java.util.HashSet; |
| 11 | import java.util.List; |
| 12 | |
| 13 | |
| 14 | import felix.util.FelixStringMan; |
| 15 | import felix.util.FelixUIMan; |
| 16 | |
| 17 | import tuffy.db.RDB; |
| 18 | import tuffy.mln.Literal; |
| 19 | import tuffy.ra.ConjunctiveQuery; |
| 20 | import tuffy.util.ExceptionMan; |
| 21 | import tuffy.util.UIMan; |
| 22 | |
| 23 | |
| 24 | /** |
| 25 | * A Data Movement Operator (DMO) is a bridge from physical database |
| 26 | * objects (e.g., view, relational table etc.) to logical |
| 27 | * requirements of the data. A statistical operator (e.g., CRF, Coref etc.) |
| 28 | * only knows the logic of DMO instead of the physical execution |
| 29 | * plan. The physical execution plan of the DMO is instantiated by |
| 30 | * the Optimizer. The logic definition of the DMO is instantiated by |
| 31 | * corresponding statistical operators. |
| 32 | * |
| 33 | * @author Ce Zhang |
| 34 | * |
| 35 | */ |
| 36 | public class DataMovementOperator { |
| 37 | |
| 38 | /** |
| 39 | * RDB object on which this DMO works on. |
| 40 | */ |
| 41 | public RDB db; |
| 42 | |
| 43 | /** |
| 44 | * Estimated number of Bound-Bound invocations. |
| 45 | */ |
| 46 | public int predictedBB = 0; |
| 47 | |
| 48 | /** |
| 49 | * Estimated number of Bound-Free invocations. |
| 50 | */ |
| 51 | public int PredictedBF = 0; |
| 52 | |
| 53 | /** |
| 54 | * Estimated number of Free-Free invocations. |
| 55 | */ |
| 56 | public int PredictedFF = 0; |
| 57 | |
| 58 | /** |
| 59 | * Whether this DMO can be used as view/table by other DMOs. |
| 60 | */ |
| 61 | public boolean isIntermediaDMO = false; |
| 62 | |
| 63 | /** |
| 64 | * Name of table/view generated by this DMO. This name |
| 65 | * can be used by other DMOs as a view/table directly. |
| 66 | */ |
| 67 | public String name = ""; |
| 68 | |
| 69 | /** |
| 70 | * Counter for DMO ID. |
| 71 | */ |
| 72 | public static int globalID = 1; |
| 73 | |
| 74 | /** |
| 75 | * Whether this DMO allowing optimizations from the optimizer. |
| 76 | */ |
| 77 | public boolean allowOptimization = true; |
| 78 | |
| 79 | /** |
| 80 | * Whether this DMO allows pre-fetching. |
| 81 | */ |
| 82 | public boolean hasKnownFetchingOrder = false; |
| 83 | |
| 84 | /** |
| 85 | * Parameter for pre-fetching optimization. |
| 86 | */ |
| 87 | public int preFetchFactor = -1; |
| 88 | |
| 89 | /** |
| 90 | * The statistical operator who instantiates this DMO. |
| 91 | */ |
| 92 | public StatOperator parentStatOperator = null; |
| 93 | |
| 94 | /** |
| 95 | * Conjunctive query or prepared statement acting as the *logic* |
| 96 | * description of this DMO. This plan cannot be executed by |
| 97 | * the executor. |
| 98 | */ |
| 99 | public QuerySet logicQueryPlan = null; |
| 100 | |
| 101 | /** |
| 102 | * How the result of this DMO is ordered? |
| 103 | */ |
| 104 | public ArrayList<String> orderBy = new ArrayList<String>(); |
| 105 | |
| 106 | /** |
| 107 | * Do we need to build index for this DMO's output/intermediate |
| 108 | * results? |
| 109 | */ |
| 110 | public boolean needIndex = false; |
| 111 | |
| 112 | /** |
| 113 | * Datalog, Conjunctive query or prepared statement acting as the *physical* |
| 114 | * description of this DMO. When this DMO is executed, it first |
| 115 | * evaluates all Datalog rules (only evaluate once), and then evaluate |
| 116 | * the conjunctive query or prepared statement (which may have been optimized). |
| 117 | * This variable cannot be touched by any ad hoc statistical operator. |
| 118 | */ |
| 119 | public QuerySet physicalQueryPlan = null; |
| 120 | |
| 121 | /** |
| 122 | * The schema for the output of this DMO. |
| 123 | */ |
| 124 | public ArrayList<String> finalSelList = new ArrayList<String>(); |
| 125 | |
| 126 | /** |
| 127 | * Part of the schema of the output of this DMO, which is from the |
| 128 | * conjunctive queries or prepared statement in {@link DataMovementOperator#logicQueryPlan}. |
| 129 | */ |
| 130 | public ArrayList<String> selListFromRule = new ArrayList<String>(); |
| 131 | |
| 132 | /** |
| 133 | * Part of the schema of the output of this DMO, which is additionally |
| 134 | * assigned (i.e., may not be founded in the conjunctive query or |
| 135 | * prepared statement in {@link DataMovementOperator#logicQueryPlan}). |
| 136 | */ |
| 137 | public ArrayList<String> additionalSelList = new ArrayList<String>(); |
| 138 | |
| 139 | /** |
| 140 | * Whether prepare() method has been invoked. |
| 141 | */ |
| 142 | public boolean hasPrepared = false; |
| 143 | |
| 144 | /** |
| 145 | * Whether the output is a {@link ResultSet} object or others. This is maintained |
| 146 | * by DMO, and is not visible to others. |
| 147 | * |
| 148 | */ |
| 149 | boolean isResultSet = true; |
| 150 | |
| 151 | /** |
| 152 | * Whether the output (if any) of this DMO should be regarded as view or materialized |
| 153 | * table. |
| 154 | */ |
| 155 | public boolean asView = true; |
| 156 | |
| 157 | /** |
| 158 | * Set of variables which will be bounded while evaluating this DMO. |
| 159 | */ |
| 160 | public HashSet<String> whichToBound = new HashSet<String>(); |
| 161 | |
| 162 | /** |
| 163 | * Object as the output of this DMO. This can be a {@link ResultSet} object or other. |
| 164 | * This variable is not visible to other class. Other class must use specified data-exchange |
| 165 | * interface of DMO instead of trying to fetching data from this variable directly. |
| 166 | */ |
| 167 | Object resultSet = null; |
| 168 | |
| 169 | /** |
| 170 | * Get the union of results from a set of DMOs. Here each DMO must share exactly the same output schema. |
| 171 | * @param db |
| 172 | * @param _parentStatOperator |
| 173 | * @param toBeUnioned set of DMOs to be unioned. |
| 174 | * @param bindingPattern bindingPattern of the resulting union. See {@link ConjunctiveQuery#psMap}. |
| 175 | * @param bindings |
| 176 | * @return |
| 177 | */ |
| 178 | @SuppressWarnings("unchecked") |
| 179 | public static DataMovementOperator UnionAll(RDB db, StatOperator _parentStatOperator, |
| 180 | List<DataMovementOperator> toBeUnioned, String bindingPattern, ArrayList<Integer> bindings, int... cid){ |
| 181 | |
| 182 | //return a dummy dmo for unionAll |
| 183 | DataMovementOperator ret = new DataMovementOperator(db, _parentStatOperator); |
| 184 | ret.allowOptimization = false; |
| 185 | ret.predictedBB = 0; |
| 186 | ret.PredictedBF = 0; |
| 187 | ret.PredictedFF = 0; |
| 188 | |
| 189 | String sql = ""; |
| 190 | ArrayList<String> subqueries = new ArrayList<String>(); |
| 191 | ArrayList<String> unionAllSelList = null; |
| 192 | |
| 193 | for(DataMovementOperator dmo : toBeUnioned){ |
| 194 | subqueries.add(" SELECT * FROM " + dmo.getAllFreeViewName()); |
| 195 | // we assume all sub-DMOs should have the same selList. |
| 196 | if(unionAllSelList == null){ |
| 197 | ret.selListFromRule = (ArrayList<String>) dmo.selListFromRule.clone(); |
| 198 | ret.additionalSelList = (ArrayList<String>) dmo.additionalSelList.clone(); |
| 199 | ret.finalSelList = (ArrayList<String>) dmo.finalSelList.clone(); |
| 200 | unionAllSelList = (ArrayList<String>) dmo.finalSelList.clone(); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | sql = "SELECT " + FelixStringMan.commaList(unionAllSelList) + " FROM ( " + |
| 205 | FelixStringMan.join(" UNION ALL ", subqueries) + ") TMPTMPTMP WHERE "; |
| 206 | |
| 207 | ArrayList<String> whereList = new ArrayList<String>(); |
| 208 | for(int i=0; i < unionAllSelList.size(); i++){ |
| 209 | if(bindingPattern.charAt(i) == '1'){ |
| 210 | whereList.add("(" + unionAllSelList.get(i) + " = ?" + ")"); |
| 211 | } |
| 212 | } |
| 213 | whereList.add("(1=1)"); |
| 214 | sql += FelixStringMan.join(" AND ", whereList); |
| 215 | |
| 216 | ret.logicQueryPlan.addQuery(db.getPrepareStatement(sql), ret.selListFromRule, ret.additionalSelList); |
| 217 | |
| 218 | |
| 219 | return ret; |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Generate a DMO which is a SELECT on the given DMO. |
| 224 | * @param db |
| 225 | * @param _parentStatOperator |
| 226 | * @param fromDMO the given DMO. |
| 227 | * @param bindings variables in the WHERE list. |
| 228 | * @return |
| 229 | */ |
| 230 | @SuppressWarnings("unchecked") |
| 231 | public static DataMovementOperator Select(RDB db, StatOperator _parentStatOperator, |
| 232 | DataMovementOperator fromDMO, ArrayList<String> bindings, int... cid){ |
| 233 | |
| 234 | //return a dummy dmo for unionAll |
| 235 | DataMovementOperator ret = new DataMovementOperator(db, _parentStatOperator); |
| 236 | ret.allowOptimization = false; |
| 237 | ret.predictedBB = 0; |
| 238 | ret.PredictedBF = 0; |
| 239 | ret.PredictedFF = 0; |
| 240 | |
| 241 | ret.selListFromRule = (ArrayList<String>) fromDMO.selListFromRule.clone(); |
| 242 | ret.additionalSelList = (ArrayList<String>) fromDMO.additionalSelList.clone(); |
| 243 | ret.finalSelList = (ArrayList<String>) fromDMO.finalSelList.clone(); |
| 244 | |
| 245 | String sql = "SELECT " + FelixStringMan.commaList(ret.finalSelList) + " FROM " + |
| 246 | fromDMO.getAllFreeViewName() + " WHERE "; |
| 247 | |
| 248 | ArrayList<String> whereList = new ArrayList<String>(); |
| 249 | for(int i=0; i < bindings.size(); i++){ |
| 250 | whereList.add("(" + bindings.get(i) + " = ?" + ")"); |
| 251 | } |
| 252 | whereList.add("(1=1)"); |
| 253 | sql += FelixStringMan.join(" AND ", whereList); |
| 254 | |
| 255 | ret.logicQueryPlan.addQuery(db.getPrepareStatement(sql), ret.selListFromRule, ret.additionalSelList); |
| 256 | |
| 257 | return ret; |
| 258 | } |
| 259 | |
| 260 | /** |
| 261 | * Generate a DMO which is a SELECT ... ORDER BY on the given DMO. |
| 262 | * @param db |
| 263 | * @param _parentStatOperator |
| 264 | * @param fromDMO the given DMO. |
| 265 | * @param bindings variables in the WHERE list. |
| 266 | * @param orderby |
| 267 | * @param cid |
| 268 | * @return |
| 269 | */ |
| 270 | @SuppressWarnings("unchecked") |
| 271 | public static DataMovementOperator SelectOrderBy(RDB db, StatOperator _parentStatOperator, |
| 272 | DataMovementOperator fromDMO, ArrayList<String> bindings, String orderby, int... cid){ |
| 273 | |
| 274 | //return a dummy dmo for unionAll |
| 275 | DataMovementOperator ret = new DataMovementOperator(db, _parentStatOperator); |
| 276 | ret.allowOptimization = false; |
| 277 | ret.predictedBB = 0; |
| 278 | ret.PredictedBF = 0; |
| 279 | ret.PredictedFF = 0; |
| 280 | |
| 281 | ret.selListFromRule = (ArrayList<String>) fromDMO.selListFromRule.clone(); |
| 282 | ret.additionalSelList = (ArrayList<String>) fromDMO.additionalSelList.clone(); |
| 283 | ret.finalSelList = (ArrayList<String>) fromDMO.finalSelList.clone(); |
| 284 | |
| 285 | String sql = "SELECT " + FelixStringMan.commaList(ret.finalSelList) + " FROM " + |
| 286 | fromDMO.getAllFreeViewName() + " WHERE "; |
| 287 | |
| 288 | ArrayList<String> whereList = new ArrayList<String>(); |
| 289 | for(int i=0; i < bindings.size(); i++){ |
| 290 | whereList.add("(" + bindings.get(i) + " = ?" + ")"); |
| 291 | } |
| 292 | whereList.add("(1=1)"); |
| 293 | sql += FelixStringMan.join(" AND ", whereList); |
| 294 | sql += orderby; |
| 295 | |
| 296 | ret.logicQueryPlan.addQuery(db.getPrepareStatement(sql), ret.selListFromRule, ret.additionalSelList); |
| 297 | |
| 298 | return ret; |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * the constructor. |
| 303 | * @param _db |
| 304 | * @param _parentStatOperator |
| 305 | */ |
| 306 | public DataMovementOperator(RDB _db, StatOperator _parentStatOperator){ |
| 307 | |
| 308 | db = _db; |
| 309 | parentStatOperator = _parentStatOperator; |
| 310 | logicQueryPlan = new QuerySet(); |
| 311 | physicalQueryPlan = new QuerySet(); |
| 312 | |
| 313 | this.name = "pred_DMO_" + (globalID++); |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Methods that prepares for the physical execution of this DMO. Invocation |
| 318 | * of this method will: 1) execute all Datalog rules in the physical |
| 319 | * plan; 2) build indices for evaluating conjunctive queries; and 3) create |
| 320 | * view/table for this DMO. This function can be only called once in |
| 321 | * each Dual decomposition iteration. |
| 322 | * |
| 323 | */ |
| 324 | public void prepare(){ |
| 325 | |
| 326 | |
| 327 | if(hasPrepared){ |
| 328 | for(ConjunctiveQuery cq : physicalQueryPlan.datalogQueries){ |
| 329 | //db.dropTable(cq.head.getPred().getRelName()); |
| 330 | String ss = "DELETE FROM " + cq.head.getPred().getRelName(); |
| 331 | db.execute(ss); |
| 332 | } |
| 333 | |
| 334 | db.commit(); |
| 335 | } |
| 336 | |
| 337 | // if(hasPrepared == false){ |
| 338 | for(ConjunctiveQuery cq : physicalQueryPlan.datalogQueries){ |
| 339 | FelixUIMan.println(2, "Materailizing " + cq); |
| 340 | cq.buildIndexes(db, null, null, null, false, new ArrayList<String>()); |
| 341 | cq.materialize(db, true, orderBy); |
| 342 | } |
| 343 | |
| 344 | // TODO: do we need to build indices for PreparedStatement? |
| 345 | if(physicalQueryPlan.objectConjunctiveQuery != null){ |
| 346 | physicalQueryPlan.objectConjunctiveQuery.buildIndexes(db, null, null, null, false, |
| 347 | this.additionalSelList); |
| 348 | |
| 349 | db.analyze(physicalQueryPlan.objectConjunctiveQuery.head.getPred().getRelName()); |
| 350 | |
| 351 | for(Literal l : physicalQueryPlan.objectConjunctiveQuery.body){ |
| 352 | db.analyze(l.getPred().getRelName()); |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | // create view/table for this DMO |
| 357 | if(!isIntermediaDMO && asView){ |
| 358 | |
| 359 | db.dropTable(this.getAllFreeViewName()); |
| 360 | db.dropView(this.getAllFreeViewName()); |
| 361 | db.commit(); |
| 362 | |
| 363 | String sql = "CREATE VIEW " + this.getAllFreeViewName() + " AS " + |
| 364 | this.getPS(null, new ArrayList<Integer>()).toString(); |
| 365 | |
| 366 | FelixUIMan.println(2, "CREATE VIEW " + this.getAllFreeViewName() + " AS " + |
| 367 | this.getPS(null, new ArrayList<Integer>()).toString()); |
| 368 | |
| 369 | db.execute(sql); |
| 370 | }else if(!isIntermediaDMO && !asView){ |
| 371 | |
| 372 | db.dropTable(this.getAllFreeViewName()); |
| 373 | db.dropView(this.getAllFreeViewName()); |
| 374 | db.commit(); |
| 375 | |
| 376 | FelixUIMan.println(2, "CREATE TABLE "+ this.getAllFreeViewName() + " AS " + this.getPS(null, new ArrayList<Integer>()).toString()); |
| 377 | String sql = "CREATE TABLE " + this.getAllFreeViewName() + " AS " + |
| 378 | this.getPS(null, new ArrayList<Integer>()).toString(); |
| 379 | db.execute(sql); |
| 380 | |
| 381 | // needIndex should go back to the optimizer? |
| 382 | needIndex = true; |
| 383 | if(needIndex){ |
| 384 | for(String s : this.selListFromRule){ |
| 385 | FelixUIMan.println(2, "CREATE INDEX " + this.getAllFreeViewName() + "_" + s |
| 386 | + " ON " + this.getAllFreeViewName() + "(" + s + ")"); |
| 387 | db.execute("CREATE INDEX " + this.getAllFreeViewName() + "_" + s |
| 388 | + " ON " + this.getAllFreeViewName() + "(" + s + ")"); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | db.analyze(this.getAllFreeViewName()); |
| 393 | } |
| 394 | |
| 395 | hasPrepared = true; |
| 396 | // } |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * Execute this DMO given bindings of variables. This method need to be invoked before |
| 401 | * {@link DataMovementOperator#next()}, {@link DataMovementOperator#getNext(int)}, |
| 402 | * {@link DataMovementOperator#getNext(String)} etc. can be invoked. This interface |
| 403 | * is similar to ResultSet in JDBC. |
| 404 | * |
| 405 | * @param bindingPattern binding patterns. If this DMO is a conjunctive query (in logic plan), |
| 406 | * use format as {@link ConjunctiveQuery#psMap} (a null value will correspond to all-free case). |
| 407 | * If this DMO is a prepared statement (in logic plan), this value should be set as null. |
| 408 | * @param bindings ordered list of constants that will be used to bind variables. |
| 409 | * @return PreparedStatement that will be used to execute this DMO. |
| 410 | */ |
| 411 | public PreparedStatement execute(String bindingPattern, ArrayList<Integer> bindings){ |
| 412 | |
| 413 | //TODO: add pre-fetch for CRF operator |
| 414 | try{ |
| 415 | |
| 416 | if(resultSet != null && resultSet.getClass().equals(ResultSet.class)){ |
| 417 | ResultSet rs = (ResultSet) resultSet; |
| 418 | rs.close(); |
| 419 | } |
| 420 | |
| 421 | resultSet = null; |
| 422 | |
| 423 | //this.prepare(); |
| 424 | |
| 425 | if(bindingPattern == null && physicalQueryPlan.objectPreparedStatement != null){ |
| 426 | |
| 427 | for(int i=0;i<bindings.size();i++){ |
| 428 | physicalQueryPlan.objectPreparedStatement.setInt(i+1, bindings.get(i)); |
| 429 | } |
| 430 | |
| 431 | physicalQueryPlan.objectPreparedStatement.execute(); |
| 432 | |
| 433 | resultSet = physicalQueryPlan.objectPreparedStatement.getResultSet(); |
| 434 | |
| 435 | isResultSet = true; |
| 436 | |
| 437 | return physicalQueryPlan.objectPreparedStatement; |
| 438 | |
| 439 | }else if(bindingPattern != null && physicalQueryPlan.objectConjunctiveQuery != null){ |
| 440 | |
| 441 | PreparedStatement ps = physicalQueryPlan.objectConjunctiveQuery.psMap.get(bindingPattern); |
| 442 | |
| 443 | for(int i=0;i<bindings.size();i++){ |
| 444 | physicalQueryPlan.objectPreparedStatement.setInt(i+1, bindings.get(i)); |
| 445 | } |
| 446 | |
| 447 | ps.execute(); |
| 448 | |
| 449 | resultSet = ps.getResultSet(); |
| 450 | |
| 451 | isResultSet = true; |
| 452 | |
| 453 | return ps; |
| 454 | |
| 455 | }else if(bindingPattern == null && physicalQueryPlan.objectConjunctiveQuery != null){ |
| 456 | |
| 457 | PreparedStatement ps = physicalQueryPlan.objectConjunctiveQuery.psMap.get( |
| 458 | physicalQueryPlan.objectConjunctiveQuery.getAllFreeBinding()); |
| 459 | |
| 460 | ps.execute(); |
| 461 | |
| 462 | resultSet = ps.getResultSet(); |
| 463 | |
| 464 | isResultSet = true; |
| 465 | |
| 466 | return ps; |
| 467 | }else{ |
| 468 | throw new Exception("Errors when trying to binding non-existing queries!"); |
| 469 | } |
| 470 | }catch(Exception e){ |
| 471 | e.printStackTrace(); |
| 472 | } |
| 473 | return null; |
| 474 | |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * Get the prepared statement that will be used to execute this DMO. |
| 479 | * See {@link DataMovementOperator#execute(String, ArrayList)} (the only difference |
| 480 | * is this method does not actually execute this DMO). |
| 481 | */ |
| 482 | public PreparedStatement getPS(String bindingPattern, ArrayList<Integer> bindings){ |
| 483 | |
| 484 | //TODO: add pre-fetch for CRF operator |
| 485 | try{ |
| 486 | |
| 487 | if(bindingPattern == null && physicalQueryPlan.objectPreparedStatement != null){ |
| 488 | |
| 489 | for(int i=0;i<bindings.size();i++){ |
| 490 | physicalQueryPlan.objectPreparedStatement.setInt(i+1, bindings.get(i)); |
| 491 | } |
| 492 | |
| 493 | return physicalQueryPlan.objectPreparedStatement; |
| 494 | |
| 495 | }else if(bindingPattern != null && physicalQueryPlan.objectConjunctiveQuery != null){ |
| 496 | |
| 497 | PreparedStatement ps = physicalQueryPlan.objectConjunctiveQuery.psMap.get(bindingPattern); |
| 498 | |
| 499 | for(int i=0;i<bindings.size();i++){ |
| 500 | physicalQueryPlan.objectPreparedStatement.setInt(i+1, bindings.get(i)); |
| 501 | } |
| 502 | |
| 503 | return ps; |
| 504 | |
| 505 | }else if(bindingPattern == null && physicalQueryPlan.objectConjunctiveQuery != null){ |
| 506 | |
| 507 | PreparedStatement ps = physicalQueryPlan.objectConjunctiveQuery.psMap.get( |
| 508 | physicalQueryPlan.objectConjunctiveQuery.getAllFreeBinding()); |
| 509 | |
| 510 | return ps; |
| 511 | }else{ |
| 512 | throw new Exception("Errors when trying to binding non-existing queries!"); |
| 513 | } |
| 514 | }catch(Exception e){ |
| 515 | |
| 516 | } |
| 517 | return null; |
| 518 | |
| 519 | } |
| 520 | |
| 521 | /** |
| 522 | * Gets the view/table name of this DMO in Free-free case. This name can be referred |
| 523 | * by other DMO directly w/o aware of the physical plan of this DMO. |
| 524 | */ |
| 525 | public String getAllFreeViewName(){ |
| 526 | try{ |
| 527 | if(this.isIntermediaDMO){ |
| 528 | throw new Exception("Requesting view name for intermedia relation!"); |
| 529 | } |
| 530 | return this.name; |
| 531 | }catch(Exception e){ |
| 532 | e.printStackTrace(); |
| 533 | } |
| 534 | return null; |
| 535 | } |
| 536 | |
| 537 | /** |
| 538 | * Whether there are more tuples in the result of this DMO. See {@link DataMovementOperator#execute(String, ArrayList)}. |
| 539 | * @return |
| 540 | */ |
| 541 | public Boolean next(){ |
| 542 | |
| 543 | try{ |
| 544 | if(isResultSet){ |
| 545 | |
| 546 | ResultSet rs = (ResultSet) resultSet; |
| 547 | |
| 548 | boolean aa = rs.next(); |
| 549 | |
| 550 | if(aa){ |
| 551 | return aa; |
| 552 | }else{ |
| 553 | rs.close(); |
| 554 | return aa; |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | }catch(Exception e){ |
| 559 | |
| 560 | } |
| 561 | |
| 562 | return null; |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * Get int value in the result of this DMO. See {@link DataMovementOperator#execute(String, ArrayList)}. |
| 567 | * @return |
| 568 | */ |
| 569 | public Integer getNext(String columnName){ |
| 570 | |
| 571 | try{ |
| 572 | if(isResultSet){ |
| 573 | |
| 574 | ResultSet rs = (ResultSet) resultSet; |
| 575 | return rs.getInt(columnName); |
| 576 | |
| 577 | } |
| 578 | |
| 579 | |
| 580 | }catch(Exception e){ |
| 581 | |
| 582 | } |
| 583 | |
| 584 | return null; |
| 585 | } |
| 586 | |
| 587 | /** |
| 588 | * Get int value in the result of this DMO. See {@link DataMovementOperator#execute(String, ArrayList)}. |
| 589 | * @return |
| 590 | */ |
| 591 | public Array getNextArray(int column){ |
| 592 | |
| 593 | try{ |
| 594 | if(isResultSet){ |
| 595 | |
| 596 | ResultSet rs = (ResultSet) resultSet; |
| 597 | return rs.getArray(column); |
| 598 | |
| 599 | } |
| 600 | |
| 601 | |
| 602 | }catch(Exception e){ |
| 603 | e.printStackTrace(); |
| 604 | } |
| 605 | |
| 606 | return null; |
| 607 | } |
| 608 | |
| 609 | /** |
| 610 | * Get int value in the result of this DMO. See {@link DataMovementOperator#execute(String, ArrayList)}. |
| 611 | * @return |
| 612 | */ |
| 613 | public Integer getNext(int column){ |
| 614 | |
| 615 | try{ |
| 616 | if(isResultSet){ |
| 617 | |
| 618 | ResultSet rs = (ResultSet) resultSet; |
| 619 | return rs.getInt(column); |
| 620 | |
| 621 | } |
| 622 | |
| 623 | |
| 624 | }catch(Exception e){ |
| 625 | e.printStackTrace(); |
| 626 | } |
| 627 | |
| 628 | return null; |
| 629 | } |
| 630 | |
| 631 | /** |
| 632 | * Get double value in the result of this DMO. See {@link DataMovementOperator#execute(String, ArrayList)}. |
| 633 | * @return |
| 634 | */ |
| 635 | public Double getNextDouble(String columnName){ |
| 636 | |
| 637 | try{ |
| 638 | if(isResultSet){ |
| 639 | |
| 640 | ResultSet rs = (ResultSet) resultSet; |
| 641 | return rs.getDouble(columnName); |
| 642 | |
| 643 | } |
| 644 | |
| 645 | |
| 646 | }catch(Exception e){ |
| 647 | |
| 648 | } |
| 649 | |
| 650 | return null; |
| 651 | } |
| 652 | |
| 653 | /** |
| 654 | * Get double value in the result of this DMO. See {@link DataMovementOperator#execute(String, ArrayList)}. |
| 655 | * @return |
| 656 | */ |
| 657 | public Double getNextDouble(int column){ |
| 658 | |
| 659 | try{ |
| 660 | if(isResultSet){ |
| 661 | |
| 662 | ResultSet rs = (ResultSet) resultSet; |
| 663 | return rs.getDouble(column); |
| 664 | |
| 665 | } |
| 666 | |
| 667 | |
| 668 | }catch(Exception e){ |
| 669 | e.printStackTrace(); |
| 670 | } |
| 671 | |
| 672 | return null; |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * Get String value in the result of this DMO. See {@link DataMovementOperator#execute(String, ArrayList)}. |
| 677 | * @return |
| 678 | */ |
| 679 | public String getNextString(int column){ |
| 680 | |
| 681 | try{ |
| 682 | if(isResultSet){ |
| 683 | |
| 684 | ResultSet rs = (ResultSet) resultSet; |
| 685 | return rs.getString(column); |
| 686 | |
| 687 | |
| 688 | } |
| 689 | |
| 690 | |
| 691 | }catch(Exception e){ |
| 692 | e.printStackTrace(); |
| 693 | } |
| 694 | |
| 695 | return null; |
| 696 | } |
| 697 | |
| 698 | /** |
| 699 | * Cancels rule of this DMO. |
| 700 | */ |
| 701 | public void closePS(){ |
| 702 | if(this.physicalQueryPlan.objectPreparedStatement != null){ |
| 703 | try { |
| 704 | UIMan.println("Cancel PS " + this.physicalQueryPlan.objectPreparedStatement); |
| 705 | this.physicalQueryPlan.objectPreparedStatement.cancel(); |
| 706 | } catch (SQLException e) { |
| 707 | e.printStackTrace(); |
| 708 | ExceptionMan.die("DMO - 708"); |
| 709 | } |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | /** |
| 714 | * Copy logic plan to physical plan directly. If a DMO does not |
| 715 | * allow global optimization, its physical plan will be filled |
| 716 | * in this fashion. Notes: This function can not be called by ad hoc |
| 717 | * statistical operator, which should only be aware of the logic plan. |
| 718 | */ |
| 719 | public void copyLogicPlanToPhysicalPlanDirectly(){ |
| 720 | physicalQueryPlan.datalogQueries = new ArrayList<ConjunctiveQuery>(); |
| 721 | physicalQueryPlan.objectConjunctiveQuery = |
| 722 | logicQueryPlan.objectConjunctiveQuery; |
| 723 | physicalQueryPlan.objectPreparedStatement = |
| 724 | logicQueryPlan.objectPreparedStatement; |
| 725 | } |
| 726 | |
| 727 | |
| 728 | /** |
| 729 | * A collection containing 1) a set of datalog rules; 2) a conjunctive query |
| 730 | * or prepared statement. |
| 731 | * |
| 732 | * @author Ce Zhang |
| 733 | * |
| 734 | */ |
| 735 | public class QuerySet{ |
| 736 | |
| 737 | public ArrayList<ConjunctiveQuery> datalogQueries; |
| 738 | |
| 739 | public ConjunctiveQuery objectConjunctiveQuery = null; |
| 740 | |
| 741 | public PreparedStatement objectPreparedStatement = null; |
| 742 | |
| 743 | /** |
| 744 | * The constructor. |
| 745 | */ |
| 746 | public QuerySet(){ |
| 747 | datalogQueries = new ArrayList<ConjunctiveQuery>(); |
| 748 | } |
| 749 | |
| 750 | /** |
| 751 | * Add one query to this collection. |
| 752 | * @param query |
| 753 | * @param selList See {@link DataMovementOperator#selListFromRule}. |
| 754 | * @param _additionalSelList See {@link DataMovementOperator#additionalSelList}. |
| 755 | */ |
| 756 | @SuppressWarnings("unchecked") |
| 757 | public void addQuery(Object query, ArrayList<String> selList, ArrayList<String> _additionalSelList){ |
| 758 | try{ |
| 759 | if(objectConjunctiveQuery != null || objectPreparedStatement != null){ |
| 760 | throw new Exception("You can have only one rule for each DMO."); |
| 761 | } |
| 762 | |
| 763 | additionalSelList = (ArrayList<String>) _additionalSelList; |
| 764 | |
| 765 | if(query.getClass().equals(ConjunctiveQuery.class)){ |
| 766 | objectConjunctiveQuery = (ConjunctiveQuery) query; |
| 767 | if(selList != null){ |
| 768 | selListFromRule = (ArrayList<String>) selList.clone(); |
| 769 | }else{ |
| 770 | for(String arg : objectConjunctiveQuery.head.getPred().getArgs()){ |
| 771 | selListFromRule.add(arg); |
| 772 | } |
| 773 | } |
| 774 | }else{ |
| 775 | if(selList != null){ |
| 776 | selListFromRule = (ArrayList<String>) selList.clone(); |
| 777 | }else{ |
| 778 | throw new Exception("You need to provide the sel-list (the field of resulting table" + |
| 779 | "for this prepared statement)"); |
| 780 | } |
| 781 | objectPreparedStatement = (PreparedStatement) query; |
| 782 | } |
| 783 | |
| 784 | finalSelList.addAll(selListFromRule); |
| 785 | finalSelList.addAll(additionalSelList); |
| 786 | }catch(Exception e){ |
| 787 | e.printStackTrace(); |
| 788 | } |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | |
| 793 | } |
| 794 | |
| 795 | |
| 796 | |
| 797 | |
| 798 | |
| 799 | |
| 800 | |
| 801 | |
| 802 | |
| 803 | |