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Support for temporary tables added. Still need more testing. (CVS 279)

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FossilOrigin-Name: 9368c62e4097aae3081a325962c1dec167fd253d
This commit is contained in:
drh
2001-10-08 13:22:32 +00:00
parent 382c0247c7
commit f57b339988
18 changed files with 684 additions and 311 deletions
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28
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 1.43 2001/10/06 16:33:03 drh Exp $
** $Id: main.c,v 1.44 2001/10/08 13:22:33 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
@@ -309,7 +309,9 @@ no_mem_on_open:
}
/*
** Erase all schema information from the schema hash table.
** Erase all schema information from the schema hash table. Except
** tables that are created using CREATE TEMPORARY TABLE are preserved
** if the preserverTemps flag is true.
**
** The database schema is normally read in once when the database
** is first opened and stored in a hash table in the sqlite structure.
@@ -317,15 +319,24 @@ no_mem_on_open:
** either the database is being closed or because some other process
** changed the schema and this process needs to reread it.
*/
static void clearHashTable(sqlite *db){
static void clearHashTable(sqlite *db, int preserveTemps){
HashElem *pElem;
Hash temp1;
temp1 = db->tblHash;
sqliteHashInit(&db->tblHash, SQLITE_HASH_STRING, 0);
sqliteHashClear(&db->idxHash);
for(pElem=sqliteHashFirst(&temp1); pElem; pElem=sqliteHashNext(pElem)){
Table *pTbl = sqliteHashData(pElem);
sqliteDeleteTable(db, pTbl);
Table *pTab = sqliteHashData(pElem);
if( preserveTemps && pTab->isTemp ){
Index *pIdx;
sqliteHashInsert(&db->tblHash, pTab->zName, strlen(pTab->zName)+1, pTab);
for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
int n = strlen(pIdx->zName)+1;
sqliteHashInsert(&db->idxHash, pIdx->zName, n, pIdx);
}
}else{
sqliteDeleteTable(db, pTab);
}
}
sqliteHashClear(&temp1);
db->flags &= ~SQLITE_Initialized;
@@ -336,7 +347,10 @@ static void clearHashTable(sqlite *db){
*/
void sqlite_close(sqlite *db){
sqliteBtreeClose(db->pBe);
clearHashTable(db);
clearHashTable(db, 0);
if( db->pBeTemp ){
sqliteBtreeClose(db->pBeTemp);
}
sqliteFree(db);
}
@@ -429,7 +443,7 @@ int sqlite_exec(
}
sqliteStrRealloc(pzErrMsg);
if( sParse.rc==SQLITE_SCHEMA ){
clearHashTable(db);
clearHashTable(db, 1);
}
return sParse.rc;
}