database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-05 15:55:57 +03:00
Code Activity

Check in implementation of foreign key constraints.

Browse Source 
FossilOrigin-Name: d5d399811876391642937edeb9e8434dd9e356f5
This commit is contained in:
dan
2009-09-19 17:00:31 +00:00
parent 3991bb0dee
commit 1da40a381f
27 changed files with 1698 additions and 182 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
src/trigger.c
View File

@@ -795,7 +795,7 @@ static TriggerPrg *codeRowTrigger(
Parse *pSubParse; /* Parse context for sub-vdbe */
int iEndTrigger = 0; /* Label to jump to if WHEN is false */
assert( pTab==tableOfTrigger(pTrigger) );
assert( pTrigger->zName==0 || pTab==tableOfTrigger(pTrigger) );
/* Allocate the TriggerPrg and SubProgram objects. To ensure that they
** are freed if an error occurs, link them into the Parse.pTriggerPrg
@@ -896,7 +896,7 @@ static TriggerPrg *getRowTrigger(
Parse *pRoot = sqlite3ParseToplevel(pParse);
TriggerPrg *pPrg;
assert( pTab==tableOfTrigger(pTrigger) );
assert( pTrigger->zName==0 || pTab==tableOfTrigger(pTrigger) );
/* It may be that this trigger has already been coded (or is in the
** process of being coded). If this is the case, then an entry with
@@ -915,6 +915,38 @@ static TriggerPrg *getRowTrigger(
return pPrg;
}
void sqlite3CodeRowTriggerDirect(
Parse *pParse, /* Parse context */
Trigger *p, /* Trigger to code */
Table *pTab, /* The table to code triggers from */
int oldIdx, /* The indice of the "old" row to access */
int orconf, /* ON CONFLICT policy */
int ignoreJump /* Instruction to jump to for RAISE(IGNORE) */
){
Vdbe *v = sqlite3GetVdbe(pParse); /* Main VM */
TriggerPrg *pPrg;
pPrg = getRowTrigger(pParse, p, pTab, orconf);
assert( pPrg || pParse->nErr || pParse->db->mallocFailed );
/* Code the OP_Program opcode in the parent VDBE. P4 of the OP_Program
** is a pointer to the sub-vdbe containing the trigger program. */
if( pPrg ){
sqlite3VdbeAddOp3(v, OP_Program, oldIdx, ignoreJump, ++pParse->nMem);
pPrg->pProgram->nRef++;
sqlite3VdbeChangeP4(v, -1, (const char *)pPrg->pProgram, P4_SUBPROGRAM);
VdbeComment(
(v, "Call: %s.%s", (p->zName?p->zName:"fkey"), onErrorText(orconf)));
/* Set the P5 operand of the OP_Program instruction to non-zero if
** recursive invocation of this trigger program is disallowed. Recursive
** invocation is disallowed if (a) the sub-program is really a trigger,
** not a foreign key action, and (b) the flag to enable recursive triggers
** is clear. */
sqlite3VdbeChangeP5(v, p->zName && !(pParse->db->flags&SQLITE_RecTriggers));
}
}
/*
** This is called to code FOR EACH ROW triggers.
**
@@ -976,19 +1008,7 @@ void sqlite3CodeRowTrigger(
&& p->tr_tm==tr_tm
&& checkColumnOverlap(p->pColumns,pChanges)
){
Vdbe *v = sqlite3GetVdbe(pParse); /* Main VM */
TriggerPrg *pPrg;
pPrg = getRowTrigger(pParse, p, pTab, orconf);
assert( pPrg || pParse->nErr || pParse->db->mallocFailed );
/* Code the OP_Program opcode in the parent VDBE. P4 of the OP_Program
** is a pointer to the sub-vdbe containing the trigger program. */
if( pPrg ){
sqlite3VdbeAddOp3(v, OP_Program, oldIdx, ignoreJump, ++pParse->nMem);
pPrg->pProgram->nRef++;
sqlite3VdbeChangeP4(v, -1, (const char *)pPrg->pProgram, P4_SUBPROGRAM);
VdbeComment((v, "Call: %s.%s", p->zName, onErrorText(orconf)));
}
sqlite3CodeRowTriggerDirect(pParse, p, pTab, oldIdx, orconf, ignoreJump);
}
}
}
@@ -1015,15 +1035,14 @@ void sqlite3CodeRowTrigger(
u32 sqlite3TriggerOldmask(
Parse *pParse, /* Parse context */
Trigger *pTrigger, /* List of triggers on table pTab */
int op, /* Either TK_UPDATE or TK_DELETE */
ExprList *pChanges, /* Changes list for any UPDATE OF triggers */
Table *pTab, /* The table to code triggers from */
int orconf /* Default ON CONFLICT policy for trigger steps */
){
const int op = pChanges ? TK_UPDATE : TK_DELETE;
u32 mask = 0;
Trigger *p;
assert(op==TK_UPDATE || op==TK_DELETE);
for(p=pTrigger; p; p=p->pNext){
if( p->op==op && checkColumnOverlap(p->pColumns,pChanges) ){
TriggerPrg *pPrg;