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Initial implementation of variable page sizes and the temp_store pragma. (CVS 1843)

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FossilOrigin-Name: 4cf6e9db757931aba2f300b7869305434d6f2d2b
This commit is contained in:
drh
2004-07-22 01:19:35 +00:00
parent 900dfba8ef
commit 90f5ecb39d
13 changed files with 387 additions and 216 deletions
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51
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 1.245 2004/07/19 17:25:25 drh Exp $
** $Id: main.c,v 1.246 2004/07/22 01:19:35 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
@@ -821,6 +821,22 @@ void *sqlite3_commit_hook(
** the connection is closed.) If zFilename is NULL then the database
** is for temporary use only and is deleted as soon as the connection
** is closed.
**
** A temporary database can be either a disk file (that is automatically
** deleted when the file is closed) or a set of red-black trees held in memory,
** depending on the values of the TEMP_STORE compile-time macro and the
** db->temp_store variable, according to the following chart:
**
** 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
*/
int sqlite3BtreeFactory(
const sqlite *db, /* Main database when opening aux otherwise 0 */
@@ -830,20 +846,41 @@ int sqlite3BtreeFactory(
Btree **ppBtree /* Pointer to new Btree object written here */
){
int btree_flags = 0;
int rc;
int useMem = 0;
assert( ppBtree != 0);
if( omitJournal ){
btree_flags |= BTREE_OMIT_JOURNAL;
}
if( !zFilename || !strcmp(zFilename, ":memory:") ){
/* If zFilename is NULL or the magic string ":memory:" then the
** new btree storest data in main memory, not a file.
*/
if( zFilename==0 ){
#ifndef TEMP_STORE
# define TEMP_STORE 2
#endif
#if TEMP_STORE==0
useMem = 0;
#endif
#if TEMP_STORE==1
useMem = db->temp_store==2;
#endif
#if TEMP_STORE==2
useMem = db->temp_store!=1;
#endif
#if TEMP_STORE==3
useMem = 1;
#endif
}
if( (zFilename && strcmp(zFilename, ":memory:")==0)
|| (zFilename==0 && useMem) ){
btree_flags |= BTREE_MEMORY;
}
return sqlite3BtreeOpen(zFilename, ppBtree, nCache, btree_flags,
(void *)&db->busyHandler);
rc = sqlite3BtreeOpen(zFilename, ppBtree, btree_flags);
if( rc==SQLITE_OK ){
sqlite3BtreeSetBusyHandler(*ppBtree, (void*)&db->busyHandler);
sqlite3BtreeSetCacheSize(*ppBtree, nCache);
}
return rc;
}
/*