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When SQLite is configured to use in-memory temp files (either by setting SQLITE_TEMP_STORE during compilation or using the temp_store pragma at run time), store statement/savepoint journals in memory also. Ticket #3825. (CVS 6575)

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FossilOrigin-Name: 38f8c5a14cd221af9e115a0fea689f2ff39e30e5
This commit is contained in:
danielk1977
2009-04-30 09:10:37 +00:00
parent 6c19747549
commit d829335e42
11 changed files with 121 additions and 63 deletions
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65
src/main.c
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@@ -14,7 +14,7 @@
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.542 2009/04/28 15:35:39 danielk1977 Exp $
** $Id: main.c,v 1.543 2009/04/30 09:10:38 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -1165,6 +1165,38 @@ void *sqlite3_rollback_hook(
return pRet;
}
/*
** This function returns true if main-memory should be used instead of
** a temporary file for transient pager files and statement journals.
** The value returned depends on the value of db->temp_store (runtime
** parameter) and the compile time value of SQLITE_TEMP_STORE. The
** following table describes the relationship between these two values
** and this functions return value.
**
** SQLITE_TEMP_STORE db->temp_store Location of temporary database
** ----------------- -------------- ------------------------------
** 0 any file (return 0)
** 1 1 file (return 0)
** 1 2 memory (return 1)
** 1 0 file (return 0)
** 2 1 file (return 0)
** 2 2 memory (return 1)
** 2 0 memory (return 1)
** 3 any memory (return 1)
*/
int sqlite3TempInMemory(sqlite3 *db){
#if SQLITE_TEMP_STORE==1
return ( db->temp_store==2 );
#endif
#if SQLITE_TEMP_STORE==2
return ( db->temp_store!=1 );
#endif
#if SQLITE_TEMP_STORE==3
return 1;
#endif
return 0;
}
/*
** This routine is called to create a connection to a database BTree
** driver. If zFilename is the name of a file, then that file is
@@ -1175,20 +1207,8 @@ void *sqlite3_rollback_hook(
** soon as the connection is closed.
**
** A virtual database can be either a disk file (that is automatically
** deleted when the file is closed) or it an be held entirely in memory,
** depending on the values of the SQLITE_TEMP_STORE compile-time macro and the
** db->temp_store variable, according to the following chart:
**
** SQLITE_TEMP_STORE db->temp_store Location of temporary database
** ----------------- -------------- ------------------------------
** 0 any file
** 1 1 file
** 1 2 memory
** 1 0 file
** 2 1 file
** 2 2 memory
** 2 0 memory
** 3 any memory
** deleted when the file is closed) or it an be held entirely in memory.
** The sqlite3TempInMemory() function is used to determine which.
*/
int sqlite3BtreeFactory(
const sqlite3 *db, /* Main database when opening aux otherwise 0 */
@@ -1209,22 +1229,11 @@ int sqlite3BtreeFactory(
if( db->flags & SQLITE_NoReadlock ){
btFlags |= BTREE_NO_READLOCK;
}
if( zFilename==0 ){
#if SQLITE_TEMP_STORE==0
/* Do nothing */
#endif
#ifndef SQLITE_OMIT_MEMORYDB
#if SQLITE_TEMP_STORE==1
if( db->temp_store==2 ) zFilename = ":memory:";
#endif
#if SQLITE_TEMP_STORE==2
if( db->temp_store!=1 ) zFilename = ":memory:";
#endif
#if SQLITE_TEMP_STORE==3
if( zFilename==0 && sqlite3TempInMemory(db) ){
zFilename = ":memory:";
#endif
#endif /* SQLITE_OMIT_MEMORYDB */
}
#endif
if( (vfsFlags & SQLITE_OPEN_MAIN_DB)!=0 && (zFilename==0 || *zFilename==0) ){
vfsFlags = (vfsFlags & ~SQLITE_OPEN_MAIN_DB) | SQLITE_OPEN_TEMP_DB;