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Java > Open Source Codes > org > apache > derby > impl > sql > compile > TransactionStatementNode


1 /*
2
3    Derby - Class org.apache.derby.impl.sql.compile.TransactionStatementNode
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    the License. You may obtain a copy of the License at
11
12       http://www.apache.org/licenses/LICENSE-2.0
13
14    Unless required by applicable law or agreed to in writing, software
15    distributed under the License is distributed on an "AS IS" BASIS,
16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17    See the License for the specific language governing permissions and
18    limitations under the License.
19
20  */
21
22
23 package org.apache.derby.impl.sql.compile;
24
25 import org.apache.derby.iapi.services.context.ContextManager;
26
27 import org.apache.derby.iapi.services.sanity.SanityManager;
28
29 /**
30  * A TransactionStatementNode represents any type of Transaction statement:
31  * SET TRANSACTION, COMMIT, and ROLLBACK.
32  *
33  * @author Ames Carlson
34  */
35
36 abstract class TransactionStatementNode extends StatementNode
37 {
38     int activationKind()
39     {
40            return StatementNode.NEED_NOTHING_ACTIVATION;
41     }
42     /**
43      * COMMIT and ROLLBACK are allowed to commit
44      * and rollback, duh.
45      *
46      * @return false
47      */
48     public boolean isAtomic()
49     {
50         return false;
51     }
52
53     /**
54      * Returns whether or not this Statement requires a set/clear savepoint
55      * around its execution. The following statement "types" do not require them:
56      * Cursor - unnecessary and won't work in a read only environment
57      * Xact - savepoint will get blown away underneath us during commit/rollback
58      *
59      * @return boolean Whether or not this Statement requires a set/clear savepoint
60      */
61     public boolean needsSavepoint()
62     {
63         return false;
64     }
65 }
66
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