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Overview
| Comment: | Allocate 4 bytes of unused header space for an "Application ID". Add the "PRAGMA application_id" command to set and query this identifier. Add the "magic.txt" file to show how the posix file command might use this application id. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | application-id |
| Files: | files | file ages | folders |
| SHA1: | 28c9e7fdee2471a3026ee05ff591194d |
| User & Date: | drh 2013-05-01 19:49:27 |
Context
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2013-05-01
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| 20:36 | Preserve the application-ID across VACUUM. Updates to the magic number file. check-in: 4a190bea user: drh tags: application-id | |
| 19:49 | Allocate 4 bytes of unused header space for an "Application ID". Add the "PRAGMA application_id" command to set and query this identifier. Add the "magic.txt" file to show how the posix file command might use this application id. check-in: 28c9e7fd user: drh tags: application-id | |
| 17:58 | Do not use a transitive constraint to an IN operator where the RHS is a constant if there exists a direct == operator to another table in an outer loop. check-in: faedaeac user: drh tags: trunk | |
Changes
Added magic.txt.
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# This file contains suggested magic(5) text for the unix file(1) # utility for recognizing SQLite3 databases. # # When SQLite is used as an application file format, it is desirable to # have file(1) recognize the database file as being with the specific # application. You can set the application_id for a database file # using: # # PRAGMA application_id = INTEGER; # # INTEGER can be any signed 32-bit integer. That integer is written as # a 4-byte big-endian integer into offset 68 of the database header. In # the tests below, this integer is sometimes rendered as a string. For # example, instead of "belong =1598444364" we write "string =_FSL" and # instead of "belong =1598903374" we write "string =_MTN". # # The Monotone application used "PRAGMA user_version=1598903374;" to set # its identifier long before "PRAGMA application_id" became available. # The user_version is very similar to application_id except that it is # stored at offset 60 instead of offset 68. The user of # "PRAGMA application_id" is preferred now. The rules using offset 60 # for Monotone are for historical compatibility only. # 0 string =SQLite\ format\ 3 >68 string =_FSL Fossil repository >68 belong =0 >>60 string =_MTN Monotone source repository >>60 string !_MTN SQLite 3.x database |
Changes to src/btree.h.
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#define BTREE_SCHEMA_VERSION 1 #define BTREE_FILE_FORMAT 2 #define BTREE_DEFAULT_CACHE_SIZE 3 #define BTREE_LARGEST_ROOT_PAGE 4 #define BTREE_TEXT_ENCODING 5 #define BTREE_USER_VERSION 6 #define BTREE_INCR_VACUUM 7 /* ** Values that may be OR'd together to form the second argument of an ** sqlite3BtreeCursorHints() call. */ #define BTREE_BULKLOAD 0x00000001 |
> |
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#define BTREE_SCHEMA_VERSION 1
#define BTREE_FILE_FORMAT 2
#define BTREE_DEFAULT_CACHE_SIZE 3
#define BTREE_LARGEST_ROOT_PAGE 4
#define BTREE_TEXT_ENCODING 5
#define BTREE_USER_VERSION 6
#define BTREE_INCR_VACUUM 7
#define BTREE_APPLICATION_ID 8
/*
** Values that may be OR'd together to form the second argument of an
** sqlite3BtreeCursorHints() call.
*/
#define BTREE_BULKLOAD 0x00000001
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Changes to src/pragma.c.
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#ifndef SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS
/*
** PRAGMA [database.]schema_version
** PRAGMA [database.]schema_version = <integer>
**
** PRAGMA [database.]user_version
** PRAGMA [database.]user_version = <integer>
**
** The pragma's schema_version and user_version are used to set or get
** the value of the schema-version and user-version, respectively. Both
** the schema-version and the user-version are 32-bit signed integers
** stored in the database header.
**
** The schema-cookie is usually only manipulated internally by SQLite. It
................................................................................
**
** The user-version is not used internally by SQLite. It may be used by
** applications for any purpose.
*/
if( sqlite3StrICmp(zLeft, "schema_version")==0
|| sqlite3StrICmp(zLeft, "user_version")==0
|| sqlite3StrICmp(zLeft, "freelist_count")==0
){
int iCookie; /* Cookie index. 1 for schema-cookie, 6 for user-cookie. */
sqlite3VdbeUsesBtree(v, iDb);
switch( zLeft[0] ){
case 'f': case 'F':
iCookie = BTREE_FREE_PAGE_COUNT;
break;
case 's': case 'S':
iCookie = BTREE_SCHEMA_VERSION;
break;
default:
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#ifndef SQLITE_OMIT_SCHEMA_VERSION_PRAGMAS /* ** PRAGMA [database.]schema_version ** PRAGMA [database.]schema_version = <integer> ** ** PRAGMA [database.]user_version ** PRAGMA [database.]user_version = <integer> ** ** PRAGMA [database.]freelist_count = <integer> ** ** PRAGMA [database.]application_id ** PRAGMA [database.]application_id = <integer> ** ** The pragma's schema_version and user_version are used to set or get ** the value of the schema-version and user-version, respectively. Both ** the schema-version and the user-version are 32-bit signed integers ** stored in the database header. ** ** The schema-cookie is usually only manipulated internally by SQLite. It ................................................................................ ** ** The user-version is not used internally by SQLite. It may be used by ** applications for any purpose. */ if( sqlite3StrICmp(zLeft, "schema_version")==0 || sqlite3StrICmp(zLeft, "user_version")==0 || sqlite3StrICmp(zLeft, "freelist_count")==0 || sqlite3StrICmp(zLeft, "application_id")==0 ){ int iCookie; /* Cookie index. 1 for schema-cookie, 6 for user-cookie. */ sqlite3VdbeUsesBtree(v, iDb); switch( zLeft[0] ){ case 'a': case 'A': iCookie = BTREE_APPLICATION_ID; break; case 'f': case 'F': iCookie = BTREE_FREE_PAGE_COUNT; break; case 's': case 'S': iCookie = BTREE_SCHEMA_VERSION; break; default: |
Changes to test/pragma.test.
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}
return "disk"
}
}
return "unknown"
}
# Test temp_store and temp_store_directory pragmas
#
ifcapable pager_pragmas {
do_test pragma-9.1 {
db close
sqlite3 db test.db
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}
return "disk"
}
}
return "unknown"
}
# Application_ID
#
do_test pragma-8.3.1 {
execsql {
PRAGMA application_id;
}
} {0}
do_test pragma-8.3.2 {
execsql {PRAGMA Application_ID(12345); PRAGMA application_id;}
} {12345}
# Test temp_store and temp_store_directory pragmas
#
ifcapable pager_pragmas {
do_test pragma-9.1 {
db close
sqlite3 db test.db
|
Changes to tool/showdb.c.
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print_decode_line(aData, 40, 4, "Schema cookie");
print_decode_line(aData, 44, 4, "Schema format version");
print_decode_line(aData, 48, 4, "Default page cache size");
print_decode_line(aData, 52, 4, "Largest auto-vac root page");
print_decode_line(aData, 56, 4, "Text encoding");
print_decode_line(aData, 60, 4, "User version");
print_decode_line(aData, 64, 4, "Incremental-vacuum mode");
print_decode_line(aData, 68, 4, "meta[7]");
print_decode_line(aData, 72, 4, "meta[8]");
print_decode_line(aData, 76, 4, "meta[9]");
print_decode_line(aData, 80, 4, "meta[10]");
print_decode_line(aData, 84, 4, "meta[11]");
print_decode_line(aData, 88, 4, "meta[12]");
print_decode_line(aData, 92, 4, "Change counter for version number");
print_decode_line(aData, 96, 4, "SQLite version number");
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print_decode_line(aData, 40, 4, "Schema cookie");
print_decode_line(aData, 44, 4, "Schema format version");
print_decode_line(aData, 48, 4, "Default page cache size");
print_decode_line(aData, 52, 4, "Largest auto-vac root page");
print_decode_line(aData, 56, 4, "Text encoding");
print_decode_line(aData, 60, 4, "User version");
print_decode_line(aData, 64, 4, "Incremental-vacuum mode");
print_decode_line(aData, 68, 4, "Application ID");
print_decode_line(aData, 72, 4, "meta[8]");
print_decode_line(aData, 76, 4, "meta[9]");
print_decode_line(aData, 80, 4, "meta[10]");
print_decode_line(aData, 84, 4, "meta[11]");
print_decode_line(aData, 88, 4, "meta[12]");
print_decode_line(aData, 92, 4, "Change counter for version number");
print_decode_line(aData, 96, 4, "SQLite version number");
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