rep-cache-db.sql revision 362181 
1/* rep-cache-db.sql -- schema for use in rep-caching
2 *   This is intended for use with SQLite 3
3 *
4 * ====================================================================
5 *    Licensed to the Apache Software Foundation (ASF) under one
6 *    or more contributor license agreements.  See the NOTICE file
7 *    distributed with this work for additional information
8 *    regarding copyright ownership.  The ASF licenses this file
9 *    to you under the Apache License, Version 2.0 (the
10 *    "License"); you may not use this file except in compliance
11 *    with the License.  You may obtain a copy of the License at
12 *
13 *      http://www.apache.org/licenses/LICENSE-2.0
14 *
15 *    Unless required by applicable law or agreed to in writing,
16 *    software distributed under the License is distributed on an
17 *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 *    KIND, either express or implied.  See the License for the
19 *    specific language governing permissions and limitations
20 *    under the License.
21 * ====================================================================
22 */
23
24-- STMT_CREATE_SCHEMA_V1
25/* A table mapping representation hashes to locations in a rev file. */
26CREATE TABLE rep_cache (
27  hash TEXT NOT NULL PRIMARY KEY,
28  revision INTEGER NOT NULL,
29  offset INTEGER NOT NULL,
30  size INTEGER NOT NULL,
31  expanded_size INTEGER NOT NULL
32  );
33
34PRAGMA USER_VERSION = 1;
35
36-- STMT_CREATE_SCHEMA_V2
37/* A table mapping representation hashes to locations in a rev file.
38   Same as in V1 schema, except that it uses the `WITHOUT ROWID` optimization:
39   https://sqlite.org/withoutrowid.html
40
41   Note that this optimization is only supported starting from SQLite version
42   3.8.2 (2013-12-06).  To keep compatibility with existing binaries, it is
43   only used for newer filesystem formats that were released together with
44   bumping the minimum required SQLite version.
45 */
46CREATE TABLE rep_cache (
47  hash TEXT NOT NULL PRIMARY KEY,
48  revision INTEGER NOT NULL,
49  offset INTEGER NOT NULL,
50  size INTEGER NOT NULL,
51  expanded_size INTEGER NOT NULL
52  ) WITHOUT ROWID;
53
54PRAGMA USER_VERSION = 2;
55
56-- STMT_GET_REP
57/* Works for both V1 and V2 schemas. */
58SELECT revision, offset, size, expanded_size
59FROM rep_cache
60WHERE hash = ?1
61
62-- STMT_SET_REP
63/* Works for both V1 and V2 schemas. */
64INSERT OR IGNORE INTO rep_cache (hash, revision, offset, size, expanded_size)
65VALUES (?1, ?2, ?3, ?4, ?5)
66
67-- STMT_GET_REPS_FOR_RANGE
68/* Works for both V1 and V2 schemas. */
69SELECT hash, revision, offset, size, expanded_size
70FROM rep_cache
71WHERE revision >= ?1 AND revision <= ?2
72
73-- STMT_GET_MAX_REV
74/* Works for both V1 and V2 schemas. */
75SELECT MAX(revision)
76FROM rep_cache
77
78-- STMT_DEL_REPS_YOUNGER_THAN_REV
79/* Works for both V1 and V2 schemas. */
80DELETE FROM rep_cache
81WHERE revision > ?1
82
83/* An INSERT takes an SQLite reserved lock that prevents other writes
84   but doesn't block reads.  The incomplete transaction means that no
85   permanent change is made to the database and the transaction is
86   removed when the database is closed.
87
88   Works for both V1 and V2 schemas.  */
89-- STMT_LOCK_REP
90BEGIN TRANSACTION;
91INSERT INTO rep_cache VALUES ('dummy', 0, 0, 0, 0)
92
93-- STMT_UNLOCK_REP
94/* Works for both V1 and V2 schemas. */
95ROLLBACK TRANSACTION;
96