01: package com.quadcap.sql;
02:
03: /* Copyright 1999 - 2003 Quadcap Software. All rights reserved.
04: *
05: * This software is distributed under the Quadcap Free Software License.
06: * This software may be used or modified for any purpose, personal or
07: * commercial. Open Source redistributions are permitted. Commercial
08: * redistribution of larger works derived from, or works which bundle
09: * this software requires a "Commercial Redistribution License"; see
10: * http://www.quadcap.com/purchase.
11: *
12: * Redistributions qualify as "Open Source" under one of the following terms:
13: *
14: * Redistributions are made at no charge beyond the reasonable cost of
15: * materials and delivery.
16: *
17: * Redistributions are accompanied by a copy of the Source Code or by an
18: * irrevocable offer to provide a copy of the Source Code for up to three
19: * years at the cost of materials and delivery. Such redistributions
20: * must allow further use, modification, and redistribution of the Source
21: * Code under substantially the same terms as this license.
22: *
23: * Redistributions of source code must retain the copyright notices as they
24: * appear in each source code file, these license terms, and the
25: * disclaimer/limitation of liability set forth as paragraph 6 below.
26: *
27: * Redistributions in binary form must reproduce this Copyright Notice,
28: * these license terms, and the disclaimer/limitation of liability set
29: * forth as paragraph 6 below, in the documentation and/or other materials
30: * provided with the distribution.
31: *
32: * The Software is provided on an "AS IS" basis. No warranty is
33: * provided that the Software is free of defects, or fit for a
34: * particular purpose.
35: *
36: * Limitation of Liability. Quadcap Software shall not be liable
37: * for any damages suffered by the Licensee or any third party resulting
38: * from use of the Software.
39: */
40:
41: import java.io.IOException;
42:
43: import java.sql.SQLException;
44:
45: /**
46: * Implementation of SQL <b>ALTER COLUMN</b> statement.
47: *
48: * @author Stan Bailes
49: */
50: public class StmtAlterColumn implements Stmt {
51: String tableName;
52: String columnName;
53: Expression defaultVal;
54:
55: public StmtAlterColumn(String tableName, String columnName,
56: Expression defaultVal) {
57: this .tableName = tableName;
58: this .columnName = columnName;
59: this .defaultVal = defaultVal;
60: }
61:
62: public void execute(Session session) throws IOException,
63: SQLException {
64: session.getTableWriteLock("#Schema");
65: session.getTableWriteLock(tableName);
66: Database db = session.getDatabase();
67: Table table = (Table) db.getRelation(tableName);
68: if (table == null) {
69: throw new SQLException("Table not found: " + tableName);
70: }
71: session.doStep(new AlterColumn(session, table, columnName,
72: defaultVal));
73: }
74: }
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