Source Code Cross Referenced for ConstraintReferential.java in  » Database-DBMS » h2database » org » h2 » constraint » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » h2database » org.h2.constraint 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2004-2008 H2 Group. Licensed under the H2 License, Version 1.0
003:         * (http://h2database.com/html/license.html).
004:         * Initial Developer: H2 Group
005:         */
006:        package org.h2.constraint;
007:
008:        import java.sql.SQLException;
009:
010:        import org.h2.command.Parser;
011:        import org.h2.command.Prepared;
012:        import org.h2.constant.ErrorCode;
013:        import org.h2.engine.Session;
014:        import org.h2.expression.Expression;
015:        import org.h2.expression.Parameter;
016:        import org.h2.index.Cursor;
017:        import org.h2.index.Index;
018:        import org.h2.message.Message;
019:        import org.h2.result.LocalResult;
020:        import org.h2.result.Row;
021:        import org.h2.result.SearchRow;
022:        import org.h2.schema.Schema;
023:        import org.h2.table.Column;
024:        import org.h2.table.IndexColumn;
025:        import org.h2.table.Table;
026:        import org.h2.util.ObjectArray;
027:        import org.h2.util.StringUtils;
028:        import org.h2.value.Value;
029:        import org.h2.value.ValueNull;
030:
031:        /**
032:         * A referential constraint.
033:         */
034:        public class ConstraintReferential extends Constraint {
035:            public static final int RESTRICT = 0, CASCADE = 1, SET_DEFAULT = 2,
036:                    SET_NULL = 3;
037:
038:            private int deleteAction;
039:            private int updateAction;
040:            private Table refTable;
041:            private Index index;
042:            private Index refIndex;
043:            private boolean indexOwner;
044:            private boolean refIndexOwner;
045:            protected IndexColumn[] columns;
046:            protected IndexColumn[] refColumns;
047:            private String deleteSQL, updateSQL;
048:            private boolean skipOwnTable;
049:
050:            public ConstraintReferential(Schema schema, int id, String name,
051:                    Table table) {
052:                super (schema, id, name, table);
053:            }
054:
055:            public String getConstraintType() {
056:                return Constraint.REFERENTIAL;
057:            }
058:
059:            private void appendAction(StringBuffer buff, int action) {
060:                switch (action) {
061:                case CASCADE:
062:                    buff.append("CASCADE");
063:                    break;
064:                case SET_DEFAULT:
065:                    buff.append("SET DEFAULT");
066:                    break;
067:                case SET_NULL:
068:                    buff.append("SET NULL");
069:                    break;
070:                default:
071:                    throw Message.getInternalError("action=" + action);
072:                }
073:            }
074:
075:            /**
076:             * Create the SQL statement of this object so a copy of the table can be made.
077:             * 
078:             * @param table the table to create the object for
079:             * @param quotedName the name of this object (quoted if necessary)
080:             * @return the SQL statement
081:             */
082:            public String getCreateSQLForCopy(Table table, String quotedName) {
083:                return getCreateSQLForCopy(table, refTable, quotedName, true);
084:            }
085:
086:            /**
087:             * Create the SQL statement of this object so a copy of the table can be made.
088:             * 
089:             * @param table the table to create the object for
090:             * @param refTable the referenced table
091:             * @param quotedName the name of this object (quoted if necessary)
092:             * @param internalIndex add the index name to the statement
093:             * @return the SQL statement
094:             */
095:            public String getCreateSQLForCopy(Table table, Table refTable,
096:                    String quotedName, boolean internalIndex) {
097:                StringBuffer buff = new StringBuffer();
098:                buff.append("ALTER TABLE ");
099:                String mainTable = table.getSQL();
100:                buff.append(mainTable);
101:                buff.append(" ADD CONSTRAINT ");
102:                buff.append(quotedName);
103:                if (comment != null) {
104:                    buff.append(" COMMENT ");
105:                    buff.append(StringUtils.quoteStringSQL(comment));
106:                }
107:                IndexColumn[] cols = columns;
108:                IndexColumn[] refCols = refColumns;
109:                buff.append(" FOREIGN KEY(");
110:                for (int i = 0; i < cols.length; i++) {
111:                    if (i > 0) {
112:                        buff.append(", ");
113:                    }
114:                    buff.append(cols[i].getSQL());
115:                }
116:                buff.append(")");
117:                if (internalIndex && indexOwner && table == this .table) {
118:                    buff.append(" INDEX ");
119:                    buff.append(index.getSQL());
120:                }
121:                buff.append(" REFERENCES ");
122:                String quotedRefTable;
123:                if (this .table == this .refTable) {
124:                    // self-referencing constraints: need to use new table
125:                    quotedRefTable = table.getSQL();
126:                } else {
127:                    quotedRefTable = refTable.getSQL();
128:                }
129:                buff.append(quotedRefTable);
130:                buff.append("(");
131:                for (int i = 0; i < refCols.length; i++) {
132:                    if (i > 0) {
133:                        buff.append(", ");
134:                    }
135:                    buff.append(refCols[i].getSQL());
136:                }
137:                buff.append(")");
138:                if (internalIndex && refIndexOwner && table == this .table) {
139:                    buff.append(" INDEX ");
140:                    buff.append(refIndex.getSQL());
141:                }
142:                if (deleteAction != RESTRICT) {
143:                    buff.append(" ON DELETE ");
144:                    appendAction(buff, deleteAction);
145:                }
146:                if (updateAction != RESTRICT) {
147:                    buff.append(" ON UPDATE ");
148:                    appendAction(buff, updateAction);
149:                }
150:                buff.append(" NOCHECK");
151:                return buff.toString();
152:            }
153:
154:            public String getShortDescription() {
155:                StringBuffer buff = new StringBuffer();
156:                buff.append(getName());
157:                buff.append(": ");
158:                buff.append(table.getSQL());
159:                buff.append(" FOREIGN KEY(");
160:                for (int i = 0; i < columns.length; i++) {
161:                    if (i > 0) {
162:                        buff.append(", ");
163:                    }
164:                    buff.append(columns[i].getSQL());
165:                }
166:                buff.append(")");
167:                buff.append(" REFERENCES ");
168:                buff.append(refTable.getSQL());
169:                buff.append("(");
170:                for (int i = 0; i < refColumns.length; i++) {
171:                    if (i > 0) {
172:                        buff.append(", ");
173:                    }
174:                    buff.append(refColumns[i].getSQL());
175:                }
176:                buff.append(")");
177:                return buff.toString();
178:            }
179:
180:            public String getCreateSQLWithoutIndexes() {
181:                return getCreateSQLForCopy(table, refTable, getSQL(), false);
182:            }
183:
184:            public String getCreateSQL() {
185:                return getCreateSQLForCopy(table, getSQL());
186:            }
187:
188:            public void setColumns(IndexColumn[] cols) {
189:                columns = cols;
190:            }
191:
192:            public IndexColumn[] getColumns() {
193:                return columns;
194:            }
195:
196:            public void setRefColumns(IndexColumn[] refCols) {
197:                refColumns = refCols;
198:            }
199:
200:            public IndexColumn[] getRefColumns() {
201:                return refColumns;
202:            }
203:
204:            public void setRefTable(Table refTable) {
205:                this .refTable = refTable;
206:                if (refTable.getTemporary()) {
207:                    setTemporary(true);
208:                }
209:            }
210:
211:            public void setIndex(Index index, boolean isOwner) {
212:                this .index = index;
213:                this .indexOwner = isOwner;
214:            }
215:
216:            public void setRefIndex(Index refIndex, boolean isRefOwner) {
217:                this .refIndex = refIndex;
218:                this .refIndexOwner = isRefOwner;
219:            }
220:
221:            public void removeChildrenAndResources(Session session)
222:                    throws SQLException {
223:                table.removeConstraint(this );
224:                refTable.removeConstraint(this );
225:                if (indexOwner) {
226:                    table.removeIndexOrTransferOwnership(session, index);
227:                }
228:                if (refIndexOwner) {
229:                    refTable.removeIndexOrTransferOwnership(session, refIndex);
230:                }
231:                database.removeMeta(session, getId());
232:                refTable = null;
233:                index = null;
234:                refIndex = null;
235:                columns = null;
236:                refColumns = null;
237:                deleteSQL = null;
238:                updateSQL = null;
239:                table = null;
240:                invalidate();
241:            }
242:
243:            public void checkRow(Session session, Table t, Row oldRow,
244:                    Row newRow) throws SQLException {
245:                if (!database.getReferentialIntegrity()) {
246:                    return;
247:                }
248:                if (!table.getCheckForeignKeyConstraints()
249:                        || !refTable.getCheckForeignKeyConstraints()) {
250:                    return;
251:                }
252:                if (t == table) {
253:                    if (!skipOwnTable) {
254:                        checkRowOwnTable(session, newRow);
255:                    }
256:                }
257:                if (t == refTable) {
258:                    checkRowRefTable(session, oldRow, newRow);
259:                }
260:            }
261:
262:            private void checkRowOwnTable(Session session, Row newRow)
263:                    throws SQLException {
264:                if (newRow == null) {
265:                    return;
266:                }
267:                boolean containsNull = false;
268:                for (int i = 0; i < columns.length; i++) {
269:                    int idx = columns[i].column.getColumnId();
270:                    Value v = newRow.getValue(idx);
271:                    if (v == ValueNull.INSTANCE) {
272:                        containsNull = true;
273:                        break;
274:                    }
275:                }
276:                if (containsNull) {
277:                    return;
278:                }
279:                if (refTable == table) {
280:                    // special case self referencing constraints: check the inserted row
281:                    // first
282:                    boolean self = true;
283:                    for (int i = 0; i < columns.length; i++) {
284:                        int idx = columns[i].column.getColumnId();
285:                        Value v = newRow.getValue(idx);
286:                        Column refCol = refColumns[i].column;
287:                        int refIdx = refCol.getColumnId();
288:                        Value r = newRow.getValue(refIdx);
289:                        if (!database.areEqual(r, v)) {
290:                            self = false;
291:                            break;
292:                        }
293:                    }
294:                    if (self) {
295:                        return;
296:                    }
297:                }
298:                Row check = refTable.getTemplateRow();
299:                for (int i = 0; i < columns.length; i++) {
300:                    int idx = columns[i].column.getColumnId();
301:                    Value v = newRow.getValue(idx);
302:                    Column refCol = refColumns[i].column;
303:                    int refIdx = refCol.getColumnId();
304:                    check.setValue(refIdx, v.convertTo(refCol.getType()));
305:                }
306:                if (!found(session, refIndex, check)) {
307:                    throw Message
308:                            .getSQLException(
309:                                    ErrorCode.REFERENTIAL_INTEGRITY_VIOLATED_PARENT_MISSING_1,
310:                                    getShortDescription());
311:                }
312:            }
313:
314:            private boolean found(Session session, Index index, SearchRow check)
315:                    throws SQLException {
316:                index.getTable().lock(session, false, false);
317:                Cursor cursor = index.find(session, check, check);
318:                while (cursor.next()) {
319:                    SearchRow found;
320:                    found = cursor.getSearchRow();
321:                    Column[] cols = index.getColumns();
322:                    boolean allEqual = true;
323:                    for (int i = 0; i < columns.length && i < cols.length; i++) {
324:                        int idx = cols[i].getColumnId();
325:                        Value c = check.getValue(idx);
326:                        Value f = found.getValue(idx);
327:                        if (database.compareTypeSave(c, f) != 0) {
328:                            allEqual = false;
329:                            break;
330:                        }
331:                    }
332:                    if (allEqual) {
333:                        return true;
334:                    }
335:                }
336:                return false;
337:            }
338:
339:            private boolean isEqual(Row oldRow, Row newRow) throws SQLException {
340:                return refIndex.compareRows(oldRow, newRow) == 0;
341:            }
342:
343:            private void checkRow(Session session, Row oldRow)
344:                    throws SQLException {
345:                if (refTable == table) {
346:                    // special case self referencing constraints: check the deleted row
347:                    // first
348:                    boolean self = true;
349:                    for (int i = 0; i < columns.length; i++) {
350:                        Column refCol = refColumns[i].column;
351:                        int refIdx = refCol.getColumnId();
352:                        Value v = oldRow.getValue(refIdx);
353:                        int idx = columns[i].column.getColumnId();
354:                        Value r = oldRow.getValue(idx);
355:                        if (!database.areEqual(r, v)) {
356:                            self = false;
357:                            break;
358:                        }
359:                    }
360:                    if (self) {
361:                        return;
362:                    }
363:                }
364:                SearchRow check = table.getTemplateSimpleRow(false);
365:                for (int i = 0; i < columns.length; i++) {
366:                    Column refCol = refColumns[i].column;
367:                    int refIdx = refCol.getColumnId();
368:                    Column col = columns[i].column;
369:                    int idx = col.getColumnId();
370:                    Value v = oldRow.getValue(refIdx).convertTo(col.getType());
371:                    check.setValue(idx, v);
372:                }
373:                if (found(session, index, check)) {
374:                    throw Message
375:                            .getSQLException(
376:                                    ErrorCode.REFERENTIAL_INTEGRITY_VIOLATED_CHILD_EXISTS_1,
377:                                    getShortDescription());
378:                }
379:            }
380:
381:            private void checkRowRefTable(Session session, Row oldRow,
382:                    Row newRow) throws SQLException {
383:                if (oldRow == null) {
384:                    // this is an insert
385:                    return;
386:                }
387:                if (newRow != null && isEqual(oldRow, newRow)) {
388:                    // on an update, if both old and new are the same, don't do anything
389:                    return;
390:                }
391:                if (newRow == null) {
392:                    // this is a delete
393:                    if (deleteAction == RESTRICT) {
394:                        checkRow(session, oldRow);
395:                    } else {
396:                        int i = deleteAction == CASCADE ? 0 : columns.length;
397:                        Prepared deleteCommand = getDelete(session);
398:                        setWhere(deleteCommand, i, oldRow);
399:                        updateWithSkipCheck(deleteCommand);
400:                    }
401:                } else {
402:                    // this is an update
403:                    if (updateAction == RESTRICT) {
404:                        checkRow(session, oldRow);
405:                    } else {
406:                        Prepared updateCommand = getUpdate(session);
407:                        if (updateAction == CASCADE) {
408:                            ObjectArray params = updateCommand.getParameters();
409:                            for (int i = 0; i < columns.length; i++) {
410:                                Parameter param = (Parameter) params.get(i);
411:                                Column refCol = refColumns[i].column;
412:                                param.setValue(newRow.getValue(refCol
413:                                        .getColumnId()));
414:                            }
415:                        }
416:                        setWhere(updateCommand, columns.length, oldRow);
417:                        updateWithSkipCheck(updateCommand);
418:                    }
419:                }
420:            }
421:
422:            private void updateWithSkipCheck(Prepared prep) throws SQLException {
423:                // TODO constraints: maybe delay the update or support delayed checks
424:                // (until commit)
425:                try {
426:                    // TODO multithreaded kernel: this works only if nobody else updates
427:                    // this or the ref table at the same time
428:                    skipOwnTable = true;
429:                    prep.update();
430:                } finally {
431:                    skipOwnTable = false;
432:                }
433:            }
434:
435:            void setWhere(Prepared command, int pos, Row row) {
436:                for (int i = 0; i < refColumns.length; i++) {
437:                    int idx = refColumns[i].column.getColumnId();
438:                    Value v = row.getValue(idx);
439:                    ObjectArray params = command.getParameters();
440:                    Parameter param = (Parameter) params.get(pos + i);
441:                    param.setValue(v);
442:                }
443:            }
444:
445:            public int getDeleteAction() {
446:                return deleteAction;
447:            }
448:
449:            public void setDeleteAction(Session session, int action)
450:                    throws SQLException {
451:                if (action == deleteAction) {
452:                    return;
453:                }
454:                if (deleteAction != RESTRICT) {
455:                    throw Message.getSQLException(
456:                            ErrorCode.CONSTRAINT_ALREADY_EXISTS_1, "ON DELETE");
457:                }
458:                this .deleteAction = action;
459:                StringBuffer buff = new StringBuffer();
460:                if (action == CASCADE) {
461:                    buff.append("DELETE FROM ");
462:                    buff.append(table.getSQL());
463:                } else {
464:                    appendUpdate(buff);
465:                }
466:                appendWhere(buff);
467:                deleteSQL = buff.toString();
468:            }
469:
470:            private Prepared getUpdate(Session session) throws SQLException {
471:                return prepare(session, updateSQL, updateAction);
472:            }
473:
474:            private Prepared getDelete(Session session) throws SQLException {
475:                return prepare(session, deleteSQL, deleteAction);
476:            }
477:
478:            public int getUpdateAction() {
479:                return updateAction;
480:            }
481:
482:            public void setUpdateAction(Session session, int action)
483:                    throws SQLException {
484:                if (action == updateAction) {
485:                    return;
486:                }
487:                if (updateAction != RESTRICT) {
488:                    throw Message.getSQLException(
489:                            ErrorCode.CONSTRAINT_ALREADY_EXISTS_1, "ON UPDATE");
490:                }
491:                this .updateAction = action;
492:                StringBuffer buff = new StringBuffer();
493:                appendUpdate(buff);
494:                appendWhere(buff);
495:                updateSQL = buff.toString();
496:            }
497:
498:            private Prepared prepare(Session session, String sql, int action)
499:                    throws SQLException {
500:                Prepared command = session.prepare(sql);
501:                if (action != CASCADE) {
502:                    ObjectArray params = command.getParameters();
503:                    for (int i = 0; i < columns.length; i++) {
504:                        Column column = columns[i].column;
505:                        Parameter param = (Parameter) params.get(i);
506:                        Value value;
507:                        if (action == SET_NULL) {
508:                            value = ValueNull.INSTANCE;
509:                        } else {
510:                            Expression expr = column.getDefaultExpression();
511:                            if (expr == null) {
512:                                throw Message.getSQLException(
513:                                        ErrorCode.NO_DEFAULT_SET_1, column
514:                                                .getName());
515:                            }
516:                            value = expr.getValue(session);
517:                        }
518:                        param.setValue(value);
519:                    }
520:                }
521:                return command;
522:            }
523:
524:            private void appendUpdate(StringBuffer buff) {
525:                buff.append("UPDATE ");
526:                buff.append(table.getSQL());
527:                buff.append(" SET ");
528:                for (int i = 0; i < columns.length; i++) {
529:                    if (i > 0) {
530:                        buff.append(" , ");
531:                    }
532:                    Column column = columns[i].column;
533:                    buff.append(Parser.quoteIdentifier(column.getName()));
534:                    buff.append("=?");
535:                }
536:            }
537:
538:            private void appendWhere(StringBuffer buff) {
539:                buff.append(" WHERE ");
540:                for (int i = 0; i < columns.length; i++) {
541:                    if (i > 0) {
542:                        buff.append(" AND ");
543:                    }
544:                    Column column = columns[i].column;
545:                    buff.append(Parser.quoteIdentifier(column.getName()));
546:                    buff.append("=?");
547:                }
548:            }
549:
550:            public Table getRefTable() {
551:                return refTable;
552:            }
553:
554:            public boolean usesIndex(Index idx) {
555:                return idx == index || idx == refIndex;
556:            }
557:
558:            public void setIndexOwner(Index index) {
559:                if (this .index == index) {
560:                    indexOwner = true;
561:                } else if (this .refIndex == index) {
562:                    refIndexOwner = true;
563:                } else {
564:                    throw Message.getInternalError();
565:                }
566:            }
567:
568:            public boolean containsColumn(Column col) {
569:                for (int i = 0; i < columns.length; i++) {
570:                    if (columns[i].column == col) {
571:                        return true;
572:                    }
573:                }
574:                for (int i = 0; i < refColumns.length; i++) {
575:                    if (refColumns[i].column == col) {
576:                        return true;
577:                    }
578:                }
579:                return false;
580:            }
581:
582:            public boolean isBefore() {
583:                return false;
584:            }
585:
586:            public void checkExistingData(Session session) throws SQLException {
587:                if (session.getDatabase().isStarting()) {
588:                    // don't check at startup
589:                    return;
590:                }
591:                StringBuffer buff = new StringBuffer();
592:                buff.append("SELECT 1 FROM (SELECT ");
593:                for (int i = 0; i < columns.length; i++) {
594:                    if (i > 0) {
595:                        buff.append(", ");
596:                    }
597:                    buff.append(columns[i].getSQL());
598:                }
599:                buff.append(" FROM ");
600:                buff.append(table.getSQL());
601:                buff.append(" WHERE ");
602:                for (int i = 0; i < columns.length; i++) {
603:                    if (i > 0) {
604:                        buff.append(" AND ");
605:                    }
606:                    buff.append(columns[i].getSQL());
607:                    buff.append(" IS NOT NULL ");
608:                }
609:                buff.append(" ORDER BY ");
610:                for (int i = 0; i < columns.length; i++) {
611:                    if (i > 0) {
612:                        buff.append(", ");
613:                    }
614:                    buff.append(columns[i].getSQL());
615:                }
616:                buff.append(") C WHERE NOT EXISTS(SELECT 1 FROM ");
617:                buff.append(refTable.getSQL());
618:                buff.append(" P WHERE ");
619:                for (int i = 0; i < columns.length; i++) {
620:                    if (i > 0) {
621:                        buff.append(" AND ");
622:                    }
623:                    buff.append("C.");
624:                    buff.append(columns[i].getSQL());
625:                    buff.append("=");
626:                    buff.append("P.");
627:                    buff.append(refColumns[i].getSQL());
628:                }
629:                buff.append(")");
630:                String sql = buff.toString();
631:                LocalResult r = session.prepare(sql).query(1);
632:                if (r.next()) {
633:                    throw Message
634:                            .getSQLException(
635:                                    ErrorCode.REFERENTIAL_INTEGRITY_VIOLATED_PARENT_MISSING_1,
636:                                    getShortDescription());
637:                }
638:            }
639:
640:        }
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