database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-22 20:22:44 +03:00
Code Activity

Refactor the Table object to reduce its memory footprint.

Browse Source 
FossilOrigin-Name: bbb6759bcf6e01d36dfc787a82a610d359f50aaeac8104b73883a84906d54e1f
This commit is contained in:
drh
2021-08-02 16:41:57 +00:00
parent 79cf2b7120
commit f38524d20d
17 changed files with 246 additions and 205 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
src/fkey.c
View File

@@ -723,7 +723,8 @@ void sqlite3FkDropTable(Parse *pParse, SrcList *pName, Table *pTab){
Vdbe *v = sqlite3GetVdbe(pParse);
assert( v ); /* VDBE has already been allocated */
assert( pTab->pSelect==0 ); /* Not a view */
assert( !IsView(pTab) ); /* Not a view */
assert( !IsVirtual(pTab) );
if( sqlite3FkReferences(pTab)==0 ){
/* Search for a deferred foreign key constraint for which this table
** is the child table. If one cannot be found, return without
@@ -731,7 +732,7 @@ void sqlite3FkDropTable(Parse *pParse, SrcList *pName, Table *pTab){
** the entire DELETE if there are no outstanding deferred constraints
** when this statement is run. */
FKey *p;
for(p=pTab->pFKey; p; p=p->pNextFrom){
for(p=pTab->u.tab.pFKey; p; p=p->pNextFrom){
if( p->isDeferred || (db->flags & SQLITE_DeferFKs) ) break;
}
if( !p ) return;
@@ -893,7 +894,8 @@ void sqlite3FkCheck(
/* Loop through all the foreign key constraints for which pTab is the
** child table (the table that the foreign key definition is part of). */
for(pFKey=pTab->pFKey; pFKey; pFKey=pFKey->pNextFrom){
assert( !IsVirtual(pTab) );
for(pFKey=pTab->u.tab.pFKey; pFKey; pFKey=pFKey->pNextFrom){
Table *pTo; /* Parent table of foreign key pFKey */
Index *pIdx = 0; /* Index on key columns in pTo */
int *aiFree = 0;
@@ -1078,7 +1080,8 @@ u32 sqlite3FkOldmask(
if( pParse->db->flags&SQLITE_ForeignKeys ){
FKey *p;
int i;
for(p=pTab->pFKey; p; p=p->pNextFrom){
assert( !IsVirtual(pTab) );
for(p=pTab->u.tab.pFKey; p; p=p->pNextFrom){
for(i=0; i<p->nCol; i++) mask |= COLUMN_MASK(p->aCol[i].iFrom);
}
for(p=sqlite3FkReferences(pTab); p; p=p->pNextTo){
@@ -1128,19 +1131,19 @@ int sqlite3FkRequired(
){
int eRet = 1; /* Value to return if bHaveFK is true */
int bHaveFK = 0; /* If FK processing is required */
if( pParse->db->flags&SQLITE_ForeignKeys ){
if( pParse->db->flags&SQLITE_ForeignKeys && !IsVirtual(pTab) ){
if( !aChange ){
/* A DELETE operation. Foreign key processing is required if the
** table in question is either the child or parent table for any
** foreign key constraint. */
bHaveFK = (sqlite3FkReferences(pTab) || pTab->pFKey);
bHaveFK = (sqlite3FkReferences(pTab) || pTab->u.tab.pFKey);
}else{
/* This is an UPDATE. Foreign key processing is only required if the
** operation modifies one or more child or parent key columns. */
FKey *p;
/* Check if any child key columns are being modified. */
for(p=pTab->pFKey; p; p=p->pNextFrom){
for(p=pTab->u.tab.pFKey; p; p=p->pNextFrom){
if( fkChildIsModified(pTab, p, aChange, chngRowid) ){
if( 0==sqlite3_stricmp(pTab->zName, p->zTo) ) eRet = 2;
bHaveFK = 1;
@@ -1416,9 +1419,9 @@ void sqlite3FkDelete(sqlite3 *db, Table *pTab){
FKey *pFKey; /* Iterator variable */
FKey *pNext; /* Copy of pFKey->pNextFrom */
assert( db==0 || IsVirtual(pTab)
|| sqlite3SchemaMutexHeld(db, 0, pTab->pSchema) );
for(pFKey=pTab->pFKey; pFKey; pFKey=pNext){
assert( !IsVirtual(pTab) );
assert( db==0 || sqlite3SchemaMutexHeld(db, 0, pTab->pSchema) );
for(pFKey=pTab->u.tab.pFKey; pFKey; pFKey=pNext){
/* Remove the FK from the fkeyHash hash table. */
if( !db || db->pnBytesFreed==0 ){