1 /* rep-cache-db.sql -- schema for use in rep-caching
2 * This is intended for use with SQLite 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
13 * http://www.apache.org/licenses/LICENSE-2.0
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
21 * ====================================================================
24 -- STMT_CREATE_SCHEMA_V1
25 /* A table mapping representation hashes to locations in a rev file. */
26 CREATE 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
34 PRAGMA USER_VERSION = 1;
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
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.
46 CREATE 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
54 PRAGMA USER_VERSION = 2;
57 /* Works for both V1 and V2 schemas. */
58 SELECT revision, offset, size, expanded_size
63 /* Works for both V1 and V2 schemas. */
64 INSERT OR IGNORE INTO rep_cache (hash, revision, offset, size, expanded_size)
65 VALUES (?1, ?2, ?3, ?4, ?5)
67 -- STMT_GET_REPS_FOR_RANGE
68 /* Works for both V1 and V2 schemas. */
69 SELECT hash, revision, offset, size, expanded_size
71 WHERE revision >= ?1 AND revision <= ?2
74 /* Works for both V1 and V2 schemas. */
78 -- STMT_DEL_REPS_YOUNGER_THAN_REV
79 /* Works for both V1 and V2 schemas. */
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.
88 Works for both V1 and V2 schemas. */
91 INSERT INTO rep_cache VALUES ('dummy', 0, 0, 0, 0)
94 /* Works for both V1 and V2 schemas. */