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Support in-memory databases for temp tables (CVS 903)

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FossilOrigin-Name: 96336bffde6c441af197a521ee9e56fdfd7efff8
This commit is contained in:
paul
2003-04-13 18:26:49 +00:00
parent c11d4f9360
commit b0208ccaa3
13 changed files with 296 additions and 39 deletions
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46
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 1.121 2003/04/05 03:42:27 drh Exp $
** $Id: main.c,v 1.122 2003/04/13 18:26:51 paul Exp $
*/
#include "sqliteInt.h"
#include "os.h"
@@ -1055,3 +1055,47 @@ void *sqlite_commit_hook(
db->pCommitArg = pArg;
return pOld;
}
/*
** This routine is called when sqlite wants to open a btree. zFilename is
** either the name of a btree file or the magic name ":memory:" which opens an
** in-memory btree or ":temp:" which opens a temporary btree. This may either
** be in memory or backed by a temporary file depending on run-time settings.
*/
int sqliteBtreeFactory(
const sqlite *db, /* Main database when opening aux otherwise 0 */
const char *zFilename, /* Name of the file containing the BTree database */
int omitJournal, /* if TRUE then do not journal this file */
int nCache, /* How many pages in the page cache */
Btree **ppBtree){ /* Pointer to new Btree object written here */
assert( zFilename != 0 );
assert( ppBtree != 0);
if (strcmp(zFilename, ":memory:") == 0) {
if (ALLOWATTACHMEM) {
return sqliteRBtreeOpen(0, 0, 0, ppBtree);
} else {
return SQLITE_CANTOPEN;
}
} else if (strcmp(zFilename, ":temp:") == 0) {
if (TEMPDBINCORE == 0) {
/* Always use file based temporary DB */
return sqliteBtreeOpen(0, omitJournal, nCache, ppBtree);
} else if (TEMPDBINCORE == 1 || TEMPDBINCORE == 2) {
/* Switch depending on compile-time and/or runtime settings. */
int location = db->tmpdb_loc == 0 ? TEMPDBINCORE : db->tmpdb_loc;
if (location == 1) {
return sqliteBtreeOpen(zFilename, omitJournal, nCache, ppBtree);
} else {
return sqliteRBtreeOpen(0, 0, 0, ppBtree);
}
} else {
/* Always use in-core DB */
return sqliteRBtreeOpen(0, 0, 0, ppBtree);
}
} else {
return sqliteBtreeOpen(zFilename, omitJournal, nCache, ppBtree);
}
}