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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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73
src/pragma.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file contains code used to implement the PRAGMA command.
**
** $Id: pragma.c,v 1.1 2003/04/06 21:08:24 drh Exp $
** $Id: pragma.c,v 1.2 2003/04/13 18:26:51 paul Exp $
*/
#include "sqliteInt.h"
@@ -64,6 +64,21 @@ static int getSafetyLevel(char *z){
return 1;
}
/*
** Interpret the given string as a temp db location. Return 1 for file
** backed temporary databases, 2 for the Red-Black tree in memory database
** and 0 to use the compile-time default.
*/
static int getTmpdbLocation(char *z){
if (sqliteStrICmp(z, "file") == 0) {
return 1;
} else if (sqliteStrICmp(z, "memory") == 0) {
return 2;
} else {
return 0;
}
}
/*
** Process a pragma statement.
**
@@ -423,6 +438,62 @@ void sqlitePragma(Parse *pParse, Token *pLeft, Token *pRight, int minusFlag){
sqliteVdbeAddOp(v, OP_Callback, 2, 0);
}
}else
/*
** PRAGMA tmpdb_location
** PRAGMA tmpdb_location= DEFAULT|MEMORY|FILE
**
** Return or set the local value of the tmpdb_location flag. Changing
** the local value does not make changes to the disk file and the default
** value will be restored the next time the database is opened.
**
** Note that it is possible for the library compile-time options to
** override this setting
*/
if( sqliteStrICmp(zLeft, "tmpdb_location")==0 ){
static VdbeOp getTmpDbLoc[] = {
{ OP_ColumnName, 0, 0, "tmpdb_location"},
{ OP_Callback, 1, 0, 0},
};
if( pRight->z==pLeft->z ){
sqliteVdbeAddOp(v, OP_Integer, db->tmpdb_loc, 0);
sqliteVdbeAddOpList(v, ArraySize(getTmpDbLoc), getTmpDbLoc);
}else{
if (&db->aDb[1].pBt != 0) {
sqliteErrorMsg(pParse, "The temporary database already exists, its location cannot now be changed");
} else {
db->tmpdb_loc = getTmpdbLocation(zRight);
}
}
}else
/*
** PRAGMA default_tmpdb_location
** PRAGMA default_tmpdb_location= DEFAULT|MEMORY|FILE
**
** Return or set the value of the persistent tmpdb_location flag (as
** well as the value currently in force).
**
** Note that it is possible for the library compile-time options to
** override this setting
*/
if( sqliteStrICmp(zLeft, "default_tmpdb_location")==0 ){
static VdbeOp getTmpDbLoc[] = {
{ OP_ColumnName, 0, 0, "tmpdb_location"},
{ OP_ReadCookie, 0, 5, 0},
{ OP_Callback, 1, 0, 0}};
if( pRight->z==pLeft->z ){
sqliteVdbeAddOpList(v, ArraySize(getTmpDbLoc), getTmpDbLoc);
}else{
if (&db->aDb[1].pBt != 0) {
sqliteErrorMsg(pParse, "The temporary database already exists, its location cannot now be changed");
} else {
sqliteBeginWriteOperation(pParse, 0, 0);
db->tmpdb_loc = getTmpdbLocation(zRight);
sqliteVdbeAddOp(v, OP_Integer, db->tmpdb_loc, 0);
sqliteVdbeAddOp(v, OP_SetCookie, 0, 5);
sqliteEndWriteOperation(pParse);
}
}
}else
#ifndef NDEBUG
if( sqliteStrICmp(zLeft, "parser_trace")==0 ){