Package org.h2.engine

Examples of org.h2.engine.Database

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        }
        return 0;
    }

    private void grantRight() {
        Database db = session.getDatabase();
        for (Table table : tables) {
            Right right = grantee.getRightForTable(table);
            if (right == null) {
                int id = getObjectId();
                right = new Right(db, id, grantee, rightMask, table);
                grantee.grantRight(table, right);
                db.addDatabaseObject(session, right);
            } else {
                right.setRightMask(right.getRightMask() | rightMask);
            }
        }
    }
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            if (grantedRole.isRoleGranted(granteeRole)) {
                // cyclic role grants are not allowed
                throw DbException.get(ErrorCode.ROLE_ALREADY_GRANTED_1, grantedRole.getSQL());
            }
        }
        Database db = session.getDatabase();
        int id = getObjectId();
        Right right = new Right(db, id, grantee, grantedRole);
        db.addDatabaseObject(session, right);
        grantee.grantRole(grantedRole, right);
    }
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            if (right == null) {
                continue;
            }
            int mask = right.getRightMask();
            int newRight = mask & ~rightMask;
            Database db = session.getDatabase();
            if (newRight == 0) {
                db.removeDatabaseObject(session, right);
            } else {
                right.setRightMask(newRight);
                db.update(session, right);
            }
        }
    }
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    private void revokeRole(Role grantedRole) {
        Right right = grantee.getRightForRole(grantedRole);
        if (right == null) {
            return;
        }
        Database db = session.getDatabase();
        db.removeDatabaseObject(session, right);
    }
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    }

    private void dropAllObjects() {
        session.getUser().checkAdmin();
        session.commit(true);
        Database db = session.getDatabase();
        db.lockMeta(session);
        // TODO local temp tables are not removed
        for (Schema schema : db.getAllSchemas()) {
            if (schema.canDrop()) {
                db.removeDatabaseObject(session, schema);
            }
        }
        ArrayList<Table> tables = db.getAllTablesAndViews(false);
        for (Table t : tables) {
            if (t.getName() != null && Table.VIEW.equals(t.getTableType())) {
                db.removeSchemaObject(session, t);
            }
        }
        for (Table t : tables) {
            if (t.getName() != null && Table.TABLE_LINK.equals(t.getTableType())) {
                db.removeSchemaObject(session, t);
            }
        }
        for (Table t : tables) {
            if (t.getName() != null && Table.TABLE.equals(t.getTableType()) && !t.isHidden()) {
                db.removeSchemaObject(session, t);
            }
        }
        session.findLocalTempTable(null);
        ArrayList<SchemaObject> list = New.arrayList();
        list.addAll(db.getAllSchemaObjects(DbObject.SEQUENCE));
        // maybe constraints and triggers on system tables will be allowed in
        // the future
        list.addAll(db.getAllSchemaObjects(DbObject.CONSTRAINT));
        list.addAll(db.getAllSchemaObjects(DbObject.TRIGGER));
        list.addAll(db.getAllSchemaObjects(DbObject.CONSTANT));
        list.addAll(db.getAllSchemaObjects(DbObject.FUNCTION_ALIAS));
        for (SchemaObject obj : list) {
            if (obj.isHidden()) {
                continue;
            }
            db.removeSchemaObject(session, obj);
        }
        for (User user : db.getAllUsers()) {
            if (user != session.getUser()) {
                db.removeDatabaseObject(session, user);
            }
        }
        for (Role role : db.getAllRoles()) {
            String sql = role.getCreateSQL();
            // the role PUBLIC must not be dropped
            if (sql != null) {
                db.removeDatabaseObject(session, role);
            }
        }
        ArrayList<DbObject> dbObjects = New.arrayList();
        dbObjects.addAll(db.getAllRights());
        dbObjects.addAll(db.getAllAggregates());
        dbObjects.addAll(db.getAllUserDataTypes());
        for (DbObject obj : dbObjects) {
            String sql = obj.getCreateSQL();
            // the role PUBLIC must not be dropped
            if (sql != null) {
                db.removeDatabaseObject(session, obj);
            }
        }
    }
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        this.addBefore = before;
    }

    public int update() {
        session.commit(true);
        Database db = session.getDatabase();
        session.getUser().checkRight(table, Right.ALL);
        table.checkSupportAlter();
        table.lock(session, true, true);
        Sequence sequence = oldColumn == null ? null : oldColumn.getSequence();
        if (newColumn != null) {
            checkDefaultReferencesTable(newColumn.getDefaultExpression());
        }
        switch (type) {
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_NOT_NULL: {
            if (!oldColumn.isNullable()) {
                // no change
                break;
            }
            checkNoNullValues();
            oldColumn.setNullable(false);
            db.update(session, table);
            break;
        }
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_NULL: {
            if (oldColumn.isNullable()) {
                // no change
                break;
            }
            checkNullable();
            oldColumn.setNullable(true);
            db.update(session, table);
            break;
        }
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_DEFAULT: {
            checkDefaultReferencesTable(defaultExpression);
            oldColumn.setSequence(null);
            oldColumn.setDefaultExpression(session, defaultExpression);
            removeSequence(sequence);
            db.update(session, table);
            break;
        }
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_CHANGE_TYPE: {
            // if the change is only increasing the precision, then we don't
            // need to copy the table because the length is only a constraint,
            // and does not affect the storage structure.
            if (oldColumn.isWideningConversion(newColumn)) {
                convertAutoIncrementColumn(newColumn);
                oldColumn.copy(newColumn);
                db.update(session, table);
            } else {
                oldColumn.setSequence(null);
                oldColumn.setDefaultExpression(session, null);
                oldColumn.setConvertNullToDefault(false);
                if (oldColumn.isNullable() && !newColumn.isNullable()) {
                    checkNoNullValues();
                } else if (!oldColumn.isNullable() && newColumn.isNullable()) {
                    checkNullable();
                }
                convertAutoIncrementColumn(newColumn);
                copyData();
            }
            break;
        }
        case CommandInterface.ALTER_TABLE_ADD_COLUMN: {
            if (ifNotExists && table.doesColumnExist(newColumn.getName())) {
                break;
            }
            convertAutoIncrementColumn(newColumn);
            copyData();
            break;
        }
        case CommandInterface.ALTER_TABLE_DROP_COLUMN: {
            if (table.getColumns().length == 1) {
                throw DbException.get(ErrorCode.CANNOT_DROP_LAST_COLUMN, oldColumn.getSQL());
            }
            table.dropSingleColumnConstraintsAndIndexes(session, oldColumn);
            copyData();
            break;
        }
        case CommandInterface.ALTER_TABLE_ALTER_COLUMN_SELECTIVITY: {
            int value = newSelectivity.optimize(session).getValue(session).getInt();
            oldColumn.setSelectivity(value);
            db.update(session, table);
            break;
        }
        default:
            DbException.throwInternalError("type=" + type);
        }
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    private void removeSequence(Sequence sequence) {
        if (sequence != null) {
            table.removeSequence(session, sequence);
            sequence.setBelongsToTable(false);
            Database db = session.getDatabase();
            db.removeSchemaObject(session, sequence);
        }
    }
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    private void copyData() {
        if (table.isTemporary()) {
            throw DbException.getUnsupportedException("TEMP TABLE");
        }
        Database db = session.getDatabase();
        String baseName = table.getName();
        String tempName = db.getTempTableName(baseName, session);
        Column[] columns = table.getColumns();
        ArrayList<Column> newColumns = New.arrayList();
        Table newTable = cloneTableStructure(columns, db, tempName, newColumns);
        try {
            // check if a view would become invalid
            // (because the column to drop is referenced or so)
            checkViews(table, newTable);
        } catch (DbException e) {
            execute("DROP TABLE " + newTable.getName(), true);
            throw DbException.get(ErrorCode.VIEW_IS_INVALID_2, e, getSQL(), e.getMessage());
        }
        String tableName = table.getName();
        ArrayList<TableView> views = table.getViews();
        if (views != null) {
            views = New.arrayList(views);
            for (TableView view : views) {
                table.removeView(view);
            }
        }
        execute("DROP TABLE " + table.getSQL() + " IGNORE", true);
        db.renameSchemaObject(session, newTable, tableName);
        for (DbObject child : newTable.getChildren()) {
            if (child instanceof Sequence) {
                continue;
            }
            String name = child.getName();
            if (name == null || child.getCreateSQL() == null) {
                continue;
            }
            if (name.startsWith(tempName + "_")) {
                name = name.substring(tempName.length() + 1);
                SchemaObject so = (SchemaObject) child;
                if (so instanceof Constraint) {
                    if (so.getSchema().findConstraint(session, name) != null) {
                        name = so.getSchema().getUniqueConstraintName(session, newTable);
                    }
                } else if (so instanceof Index) {
                    if (so.getSchema().findIndex(session, name) != null) {
                        name = so.getSchema().getUniqueIndexName(session, newTable, name);
                    }
                }
                db.renameSchemaObject(session, so, name);
            }
        }
        if (views != null) {
            for (TableView view : views) {
                String sql = view.getCreateSQL(true, true);
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     * Check that all views and other dependent objects.
     */
    private void checkViews(SchemaObject sourceTable, SchemaObject newTable) {
        String sourceTableName = sourceTable.getName();
        String newTableName = newTable.getName();
        Database db = sourceTable.getDatabase();
        // save the real table under a temporary name
        String temp = db.getTempTableName(sourceTableName, session);
        db.renameSchemaObject(session, sourceTable, temp);
        try {
            // have our new table impersonate the target table
            db.renameSchemaObject(session, newTable, sourceTableName);
            checkViewsAreValid(sourceTable);
        } finally {
            // always put the source tables back with their proper names
            try {
                db.renameSchemaObject(session, newTable, newTableName);
            } finally {
                db.renameSchemaObject(session, sourceTable, sourceTableName);
            }
        }
    }
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        this.ifNotExists = ifNotExists;
    }

    public int update() {
        session.commit(true);
        Database db = session.getDatabase();
        if (getSchema().findTrigger(triggerName) != null) {
            if (ifNotExists) {
                return 0;
            }
            throw DbException.get(ErrorCode.TRIGGER_ALREADY_EXISTS_1, triggerName);
        }
        int id = getObjectId();
        Table table = getSchema().getTableOrView(session, tableName);
        TriggerObject trigger = new TriggerObject(getSchema(), id, triggerName, table);
        trigger.setInsteadOf(insteadOf);
        trigger.setBefore(before);
        trigger.setNoWait(noWait);
        trigger.setQueueSize(queueSize);
        trigger.setRowBased(rowBased);
        trigger.setTypeMask(typeMask);
        trigger.setOnRollback(onRollback);
        trigger.setTriggerClassName(session, triggerClassName, force);
        db.addSchemaObject(session, trigger);
        table.addTrigger(trigger);
        return 0;
    }
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