Completed FOREIGN KEY syntax.

Added functionality for automatic trigger creation during CREATE TABLE. Added ON DELETE RESTRICT and some others. Jan
2025-11-10 17:42:29 +03:00 · 1999-12-06 18:02:47 +00:00
parent 1d8ce77233
commit b8ef7e7f82
6 changed files with 1178 additions and 114 deletions
--- a/src/backend/parser/analyze.c
+++ b/src/backend/parser/analyze.c
@@ -5,7 +5,7 @@
 *
 * Copyright (c) 1994, Regents of the University of California
 *
- *	$Id: analyze.c,v 1.124 1999/11/15 02:00:09 tgl Exp $
+ *	$Id: analyze.c,v 1.125 1999/12/06 18:02:42 wieck Exp $
 *
 *-------------------------------------------------------------------------
 */
@@ -13,6 +13,8 @@
 #include "postgres.h"

 #include "access/heapam.h"
+#include "catalog/catname.h"
+#include "catalog/pg_index.h"
 #include "catalog/pg_type.h"
 #include "nodes/makefuncs.h"
 #include "parse.h"
@@ -35,6 +37,7 @@ static Query *transformCursorStmt(ParseState *pstate, SelectStmt *stmt);
 static Query *transformCreateStmt(ParseState *pstate, CreateStmt *stmt);

 static void transformForUpdate(Query *qry, List *forUpdate);
+static void transformFkeyGetPrimaryKey(FkConstraint *fkconstraint);
 void		CheckSelectForUpdate(Query *qry);

 /* kluge to return extra info from transformCreateStmt() */
@@ -556,28 +559,32 @@ CreateIndexName(char *table_name, char *column_name, char *label, List *indices)
 static Query *
 transformCreateStmt(ParseState *pstate, CreateStmt *stmt)
 {
-	Query	   *q;
-	List	   *elements;
-	Node	   *element;
-	List	   *columns;
-	List	   *dlist;
-	ColumnDef  *column;
-	List	   *constraints,
-			   *clist;
-	Constraint *constraint;
-	List	   *keys;
-	Ident	   *key;
-	List	   *blist = NIL;	/* "before list" of things to do before
-								 * creating the table */
-	List	   *ilist = NIL;	/* "index list" of things to do after
-								 * creating the table */
-	IndexStmt  *index,
-			   *pkey = NULL;
-	IndexElem  *iparam;
+	Query		   *q;
+	List		   *elements;
+	Node		   *element;
+	List		   *columns;
+	List		   *dlist;
+	ColumnDef	   *column;
+	List		   *constraints,
+				   *clist;
+	Constraint	   *constraint;
+	List		   *fkconstraints,	/* List of FOREIGN KEY constraints to */
+				   *fkclist;		/* add finally */
+	FkConstraint   *fkconstraint;
+	List		   *keys;
+	Ident		   *key;
+	List		   *blist = NIL;	/* "before list" of things to do before
+									 * creating the table */
+	List		   *ilist = NIL;	/* "index list" of things to do after
+									 * creating the table */
+	IndexStmt	   *index,
+				   *pkey = NULL;
+	IndexElem	   *iparam;

 	q = makeNode(Query);
 	q->commandType = CMD_UTILITY;

+	fkconstraints = NIL;
 	constraints = stmt->constraints;
 	columns = NIL;
 	dlist = NIL;
@@ -648,6 +655,28 @@ transformCreateStmt(ParseState *pstate, CreateStmt *stmt)
 				foreach(clist, column->constraints)
 				{
 					constraint = lfirst(clist);
+
+					/* ----------
+					 * If this column constraint is a FOREIGN KEY
+					 * constraint, then we fill in the current attributes
+					 * name and throw it into the list of FK constraints
+					 * to be processed later.
+					 * ----------
+					 */
+					if (nodeTag(constraint) == T_FkConstraint)
+					{
+						Ident	*id = makeNode(Ident);
+						id->name		= column->colname;
+						id->indirection	= NIL;
+						id->isRel		= false;
+
+						fkconstraint = (FkConstraint *)constraint;
+						fkconstraint->fk_attrs = lappend(NIL, id);
+						
+						fkconstraints = lappend(fkconstraints, constraint);
+						continue;
+					}
+
 					switch (constraint->contype)
 					{
 						case CONSTR_NULL:
@@ -735,6 +764,15 @@ transformCreateStmt(ParseState *pstate, CreateStmt *stmt)
 				}
 				break;

+			case T_FkConstraint:
+				/* ----------
+				 * Table level FOREIGN KEY constraints are already complete.
+				 * Just remember for later.
+				 * ----------
+				 */
+				fkconstraints = lappend(fkconstraints, element);
+				break;
+
 			default:
 				elog(ERROR, "parser: unrecognized node (internal error)");
 		}
@@ -888,9 +926,235 @@ transformCreateStmt(ParseState *pstate, CreateStmt *stmt)
 	extras_before = blist;
 	extras_after = ilist;

+	/*
+	 * Now process the FOREIGN KEY constraints and add appropriate
+	 * queries to the extras_after statements list.
+	 *
+	 */
+	if (fkconstraints != NIL)
+	{
+		CreateTrigStmt	   *fk_trigger;
+		List			   *fk_attr;
+		List			   *pk_attr;
+		Ident			   *id;
+
+		elog(NOTICE, "CREATE TABLE will create implicit trigger(s) for FOREIGN KEY check(s)");
+
+		foreach (fkclist, fkconstraints)
+		{
+			fkconstraint = (FkConstraint *)lfirst(fkclist);
+
+			/*
+			 * If the constraint has no name, set it to <unnamed>
+			 *
+			 */
+			if (fkconstraint->constr_name == NULL)
+				fkconstraint->constr_name = "<unnamed>";
+
+			/*
+			 * If the attribute list for the referenced table was
+			 * omitted, lookup for the definition of the primary key
+			 *
+			 */
+			if (fkconstraint->fk_attrs != NIL && fkconstraint->pk_attrs == NIL)
+				transformFkeyGetPrimaryKey(fkconstraint);
+			
+			/*
+			 * Build a CREATE CONSTRAINT TRIGGER statement for the CHECK
+			 * action.
+			 *
+			 */
+			fk_trigger = (CreateTrigStmt *)makeNode(CreateTrigStmt);
+			fk_trigger->trigname		= fkconstraint->constr_name;
+			fk_trigger->relname			= stmt->relname;
+			fk_trigger->funcname		= "RI_FKey_check_ins";
+			fk_trigger->before			= false;
+			fk_trigger->row				= true;
+			fk_trigger->actions[0]		= 'i';
+			fk_trigger->actions[1]		= 'u';
+			fk_trigger->actions[2]		= '\0';
+			fk_trigger->lang			= NULL;
+			fk_trigger->text			= NULL;
+			fk_trigger->attr			= NIL;
+			fk_trigger->when			= NULL;
+			fk_trigger->isconstraint	= true;
+			fk_trigger->deferrable		= fkconstraint->deferrable;
+			fk_trigger->initdeferred	= fkconstraint->initdeferred;
+			fk_trigger->constrrelname	= fkconstraint->pktable_name;
+
+			fk_trigger->args		= NIL;
+			fk_trigger->args = lappend(fk_trigger->args,
+										fkconstraint->constr_name);
+			fk_trigger->args = lappend(fk_trigger->args,
+										stmt->relname);
+			fk_trigger->args = lappend(fk_trigger->args,
+										fkconstraint->pktable_name);
+			fk_trigger->args = lappend(fk_trigger->args,
+										fkconstraint->match_type);
+			fk_attr = fkconstraint->fk_attrs;
+			pk_attr = fkconstraint->pk_attrs;
+			if (length(fk_attr) != length(pk_attr))
+			{
+				elog(NOTICE, "Illegal FOREIGN KEY definition REFERENCES \"%s\"",
+							fkconstraint->pktable_name);
+				elog(ERROR, "number of key attributes in referenced table must be equal to foreign key");
+			}
+			while (fk_attr != NIL)
+			{
+				id = (Ident *)lfirst(fk_attr);
+				fk_trigger->args = lappend(fk_trigger->args, id->name);
+
+				id = (Ident *)lfirst(pk_attr);
+				fk_trigger->args = lappend(fk_trigger->args, id->name);
+
+				fk_attr = lnext(fk_attr);
+				pk_attr = lnext(pk_attr);
+			}
+
+			extras_after = lappend(extras_after, (Node *)fk_trigger);
+
+			if ((fkconstraint->actions & FKCONSTR_ON_DELETE_MASK) != 0)
+			{
+				/*
+				 * Build a CREATE CONSTRAINT TRIGGER statement for the 
+				 * ON DELETE action fired on the PK table !!!
+				 *
+				 */
+				fk_trigger = (CreateTrigStmt *)makeNode(CreateTrigStmt);
+				fk_trigger->trigname		= fkconstraint->constr_name;
+				fk_trigger->relname			= fkconstraint->pktable_name;
+				switch ((fkconstraint->actions & FKCONSTR_ON_DELETE_MASK)
+								>> FKCONSTR_ON_DELETE_SHIFT)
+				{
+					case FKCONSTR_ON_KEY_RESTRICT:
+						fk_trigger->funcname = "RI_FKey_restrict_del";
+						break;
+					case FKCONSTR_ON_KEY_CASCADE:
+						fk_trigger->funcname = "RI_FKey_cascade_del";
+						break;
+					case FKCONSTR_ON_KEY_SETNULL:
+						fk_trigger->funcname = "RI_FKey_setnull_del";
+						break;
+					case FKCONSTR_ON_KEY_SETDEFAULT:
+						fk_trigger->funcname = "RI_FKey_setdefault_del";
+						break;
+					default:
+						elog(ERROR, "Only one ON DELETE action can be specified for FOREIGN KEY constraint");
+						break;
+				}
+				fk_trigger->before			= false;
+				fk_trigger->row				= true;
+				fk_trigger->actions[0]		= 'd';
+				fk_trigger->actions[1]		= '\0';
+				fk_trigger->lang			= NULL;
+				fk_trigger->text			= NULL;
+				fk_trigger->attr			= NIL;
+				fk_trigger->when			= NULL;
+				fk_trigger->isconstraint	= true;
+				fk_trigger->deferrable		= fkconstraint->deferrable;
+				fk_trigger->initdeferred	= fkconstraint->initdeferred;
+				fk_trigger->constrrelname	= stmt->relname;
+
+				fk_trigger->args		= NIL;
+				fk_trigger->args = lappend(fk_trigger->args,
+											fkconstraint->constr_name);
+				fk_trigger->args = lappend(fk_trigger->args,
+											stmt->relname);
+				fk_trigger->args = lappend(fk_trigger->args,
+											fkconstraint->pktable_name);
+				fk_trigger->args = lappend(fk_trigger->args,
+											fkconstraint->match_type);
+				fk_attr = fkconstraint->fk_attrs;
+				pk_attr = fkconstraint->pk_attrs;
+				while (fk_attr != NIL)
+				{
+					id = (Ident *)lfirst(fk_attr);
+					fk_trigger->args = lappend(fk_trigger->args, id->name);
+
+					id = (Ident *)lfirst(pk_attr);
+					fk_trigger->args = lappend(fk_trigger->args, id->name);
+
+					fk_attr = lnext(fk_attr);
+					pk_attr = lnext(pk_attr);
+				}
+
+				extras_after = lappend(extras_after, (Node *)fk_trigger);
+			}
+
+			if ((fkconstraint->actions & FKCONSTR_ON_UPDATE_MASK) != 0)
+			{
+				/*
+				 * Build a CREATE CONSTRAINT TRIGGER statement for the 
+				 * ON UPDATE action fired on the PK table !!!
+				 *
+				 */
+				fk_trigger = (CreateTrigStmt *)makeNode(CreateTrigStmt);
+				fk_trigger->trigname		= fkconstraint->constr_name;
+				fk_trigger->relname			= fkconstraint->pktable_name;
+				switch ((fkconstraint->actions & FKCONSTR_ON_UPDATE_MASK)
+								>> FKCONSTR_ON_UPDATE_SHIFT)
+				{
+					case FKCONSTR_ON_KEY_RESTRICT:
+						fk_trigger->funcname = "RI_FKey_restrict_upd";
+						break;
+					case FKCONSTR_ON_KEY_CASCADE:
+						fk_trigger->funcname = "RI_FKey_cascade_upd";
+						break;
+					case FKCONSTR_ON_KEY_SETNULL:
+						fk_trigger->funcname = "RI_FKey_setnull_upd";
+						break;
+					case FKCONSTR_ON_KEY_SETDEFAULT:
+						fk_trigger->funcname = "RI_FKey_setdefault_upd";
+						break;
+					default:
+						elog(ERROR, "Only one ON UPDATE action can be specified for FOREIGN KEY constraint");
+						break;
+				}
+				fk_trigger->before			= false;
+				fk_trigger->row				= true;
+				fk_trigger->actions[0]		= 'u';
+				fk_trigger->actions[1]		= '\0';
+				fk_trigger->lang			= NULL;
+				fk_trigger->text			= NULL;
+				fk_trigger->attr			= NIL;
+				fk_trigger->when			= NULL;
+				fk_trigger->isconstraint	= true;
+				fk_trigger->deferrable		= fkconstraint->deferrable;
+				fk_trigger->initdeferred	= fkconstraint->initdeferred;
+				fk_trigger->constrrelname	= stmt->relname;
+
+				fk_trigger->args		= NIL;
+				fk_trigger->args = lappend(fk_trigger->args,
+											fkconstraint->constr_name);
+				fk_trigger->args = lappend(fk_trigger->args,
+											stmt->relname);
+				fk_trigger->args = lappend(fk_trigger->args,
+											fkconstraint->pktable_name);
+				fk_trigger->args = lappend(fk_trigger->args,
+											fkconstraint->match_type);
+				fk_attr = fkconstraint->fk_attrs;
+				pk_attr = fkconstraint->pk_attrs;
+				while (fk_attr != NIL)
+				{
+					id = (Ident *)lfirst(fk_attr);
+					fk_trigger->args = lappend(fk_trigger->args, id->name);
+
+					id = (Ident *)lfirst(pk_attr);
+					fk_trigger->args = lappend(fk_trigger->args, id->name);
+
+					fk_attr = lnext(fk_attr);
+					pk_attr = lnext(pk_attr);
+				}
+
+				extras_after = lappend(extras_after, (Node *)fk_trigger);
+			}
+		}
+	}
+
 	return q;
 }	/* transformCreateStmt() */

+
 /*
 * transformIndexStmt -
 *	  transforms the qualification of the index statement
@@ -1338,3 +1602,99 @@ transformForUpdate(Query *qry, List *forUpdate)
 	qry->rowMark = rowMark;
 	return;
 }
+
+
+/*
+ * transformFkeyGetPrimaryKey -
+ *
+ *	Try to find the primary key attributes of a referenced table if
+ *	the column list in the REFERENCES specification was omitted.
+ *
+ */
+static void
+transformFkeyGetPrimaryKey(FkConstraint *fkconstraint)
+{
+	Relation			pkrel;
+	Form_pg_attribute  *pkrel_attrs;
+	Relation			indexRd;
+	HeapScanDesc		indexSd;
+	ScanKeyData			key;
+	HeapTuple			indexTup;
+	Form_pg_index		indexStruct = NULL;
+	Ident			   *pkattr;
+	int					pkattno;
+	int					i;
+
+	/* ----------
+	 * Open the referenced table and get the attributes list
+	 * ----------
+	 */
+	pkrel = heap_openr(fkconstraint->pktable_name, AccessShareLock);
+	if (pkrel == NULL)
+		elog(ERROR, "referenced table \"%s\" not found",
+						fkconstraint->pktable_name);
+	pkrel_attrs = pkrel->rd_att->attrs;
+
+	/* ----------
+	 * Open pg_index and begin a scan for all indices defined on
+	 * the referenced table
+	 * ----------
+	 */
+	indexRd = heap_openr(IndexRelationName, AccessShareLock);
+	ScanKeyEntryInitialize(&key, 0, Anum_pg_index_indrelid,
+								F_OIDEQ,
+								ObjectIdGetDatum(pkrel->rd_id));
+    indexSd = heap_beginscan(indexRd,   /* scan desc */
+								false,     /* scan backward flag */
+								SnapshotNow,       /* NOW snapshot */
+								1, /* number scan keys */
+								&key);     /* scan keys */
+
+	/* ----------
+	 * Fetch the index with indisprimary == true
+	 * ----------
+	 */
+	while (HeapTupleIsValid(indexTup = heap_getnext(indexSd, 0)))
+	{
+		indexStruct = (Form_pg_index) GETSTRUCT(indexTup);
+
+		if (indexStruct->indisprimary)
+		{
+			break;
+		}
+	}
+
+	/* ----------
+	 * Check that we found it
+	 * ----------
+	 */
+	if (!HeapTupleIsValid(indexTup))
+		elog(ERROR, "PRIMARY KEY for referenced table \"%s\" not found",
+					fkconstraint->pktable_name);
+
+	/* ----------
+	 * Now build the list of PK attributes from the indkey definition
+	 * using the attribute names of the PK relation descriptor
+	 * ----------
+	 */
+	for (i = 0; i < 8 && indexStruct->indkey[i] != 0; i++)
+	{
+		pkattno = indexStruct->indkey[i];
+		pkattr = (Ident *)makeNode(Ident);
+		pkattr->name = nameout(&(pkrel_attrs[pkattno - 1]->attname));
+		pkattr->indirection = NIL;
+		pkattr->isRel = false;
+
+		fkconstraint->pk_attrs = lappend(fkconstraint->pk_attrs, pkattr);
+	}
+
+	/* ----------
+	 * End index scan and close relations
+	 * ----------
+	 */
+	heap_endscan(indexSd);
+	heap_close(indexRd, AccessShareLock);
+	heap_close(pkrel, AccessShareLock);
+}
+
+
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -10,7 +10,7 @@
 *
 *
 * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.116 1999/11/30 03:57:24 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.117 1999/12/06 18:02:43 wieck Exp $
 *
 * HISTORY
 *	  AUTHOR			DATE			MAJOR EVENT
@@ -143,7 +143,6 @@ static Node *doNegate(Node *n);

 %type <boolean>	TriggerActionTime, TriggerForSpec, PLangTrusted

-%type <ival>	OptConstrTrigDeferrable, OptConstrTrigInitdeferred
 %type <str>		OptConstrFromTable

 %type <str>		TriggerEvents, TriggerFuncArg
@@ -249,8 +248,10 @@ static Node *doNegate(Node *n);
 %type <node>	TableConstraint
 %type <list>	ColPrimaryKey, ColQualList, ColQualifier
 %type <node>	ColConstraint, ColConstraintElem
-%type <list>	key_actions, key_action
-%type <str>		key_match, key_reference
+%type <ival>	key_actions, key_action, key_reference
+%type <str>		key_match
+%type <ival>	ConstraintAttributeSpec, ConstraintDeferrabilitySpec,
+				ConstraintTimeSpec

 %type <list>	constraints_set_list
 %type <list>	constraints_set_namelist
@@ -976,9 +977,24 @@ ColPrimaryKey:  PRIMARY KEY
 ColConstraint:
 		CONSTRAINT name ColConstraintElem
 				{
-						Constraint *n = (Constraint *)$3;
-						if (n != NULL) n->name = $2;
-						$$ = $3;
+					switch (nodeTag($3))
+					{
+						case T_Constraint:
+							{
+								Constraint *n = (Constraint *)$3;
+								if (n != NULL) n->name = $2;
+							}
+							break;
+						case T_FkConstraint:
+							{
+								FkConstraint *n = (FkConstraint *)$3;
+								if (n != NULL) n->constr_name = $2;
+							}
+							break;
+						default:
+							break;
+					}
+					$$ = $3;
 				}
 		| ColConstraintElem
 				{ $$ = $1; }
@@ -1060,10 +1076,25 @@ ColConstraintElem:  CHECK '(' a_expr ')'
 					n->keys = NULL;
 					$$ = (Node *)n;
 				}
-			| REFERENCES ColId opt_column_list key_match key_actions
+			| REFERENCES ColId opt_column_list key_match key_actions 
 				{
-					elog(NOTICE,"CREATE TABLE/FOREIGN KEY clause ignored; not yet implemented");
-					$$ = NULL;
+					/* XXX
+					 *	Need ConstraintAttributeSpec as $6 -- Jan
+					 */
+					FkConstraint *n = makeNode(FkConstraint);
+					n->constr_name		= NULL;
+					n->pktable_name		= $2;
+					n->fk_attrs			= NIL;
+					n->pk_attrs			= $3;
+					n->match_type		= $4;
+					n->actions			= $5;
+					n->deferrable		= true;
+					n->initdeferred		= false;
+					/*
+					n->deferrable		= ($6 & 1) != 0;
+					n->initdeferred		= ($6 & 2) != 0;
+					*/
+					$$ = (Node *)n;
 				}
 		;

@@ -1073,9 +1104,24 @@ ColConstraintElem:  CHECK '(' a_expr ')'
 */
 TableConstraint:  CONSTRAINT name ConstraintElem
 				{
-						Constraint *n = (Constraint *)$3;
-						if (n != NULL) n->name = $2;
-						$$ = $3;
+					switch (nodeTag($3))
+					{
+						case T_Constraint:
+							{
+								Constraint *n = (Constraint *)$3;
+								if (n != NULL) n->name = $2;
+							}
+							break;
+						case T_FkConstraint:
+							{
+								FkConstraint *n = (FkConstraint *)$3;
+								if (n != NULL) n->constr_name = $2;
+							}
+							break;
+						default:
+							break;
+					}
+					$$ = $3;
 				}
 		| ConstraintElem
 				{ $$ = $1; }
@@ -1110,31 +1156,51 @@ ConstraintElem:  CHECK '(' a_expr ')'
 					n->keys = $4;
 					$$ = (Node *)n;
 				}
-		| FOREIGN KEY '(' columnList ')' REFERENCES ColId opt_column_list key_match key_actions
+		| FOREIGN KEY '(' columnList ')' REFERENCES ColId opt_column_list key_match key_actions ConstraintAttributeSpec
 				{
-					elog(NOTICE,"CREATE TABLE/FOREIGN KEY clause ignored; not yet implemented");
-					$$ = NULL;
+					FkConstraint *n = makeNode(FkConstraint);
+					n->constr_name		= NULL;
+					n->pktable_name		= $7;
+					n->fk_attrs			= $4;
+					n->pk_attrs			= $8;
+					n->match_type		= $9;
+					n->actions			= $10;
+					n->deferrable		= ($11 & 1) != 0;
+					n->initdeferred		= ($11 & 2) != 0;
+					$$ = (Node *)n;
 				}
 		;

-key_match:  MATCH FULL					{ $$ = NULL; }
-		| MATCH PARTIAL					{ $$ = NULL; }
-		| /*EMPTY*/						{ $$ = NULL; }
+key_match:  MATCH FULL
+			{
+				$$ = "FULL";
+			}
+		| MATCH PARTIAL
+			{
+				elog(ERROR, "FOREIGN KEY match type PARTIAL not implemented yet");
+				$$ = "PARTIAL";
+			}
+		| /*EMPTY*/
+			{
+				elog(ERROR, "FOREIGN KEY match type UNSPECIFIED not implemented yet");
+				$$ = "UNSPECIFIED";
+			}
 		;

-key_actions:  key_action key_action		{ $$ = NIL; }
-		| key_action					{ $$ = NIL; }
-		| /*EMPTY*/						{ $$ = NIL; }
+key_actions:  key_action key_action		{ $$ = $1 | $2; }
+		| key_action					{ $$ = $1; }
+		| /*EMPTY*/						{ $$ = 0; }
 		;

-key_action:  ON DELETE key_reference	{ $$ = NIL; }
-		| ON UPDATE key_reference		{ $$ = NIL; }
+key_action:  ON DELETE key_reference	{ $$ = $3 << FKCONSTR_ON_DELETE_SHIFT; }
+		| ON UPDATE key_reference		{ $$ = $3 << FKCONSTR_ON_UPDATE_SHIFT; }
 		;

-key_reference:  NO ACTION				{ $$ = NULL; }
-		| CASCADE						{ $$ = NULL; }
-		| SET DEFAULT					{ $$ = NULL; }
-		| SET NULL_P					{ $$ = NULL; }
+key_reference:  NO ACTION				{ $$ = FKCONSTR_ON_KEY_NOACTION; }
+		| RESTRICT						{ $$ = FKCONSTR_ON_KEY_RESTRICT; }
+		| CASCADE						{ $$ = FKCONSTR_ON_KEY_CASCADE; }
+		| SET NULL_P					{ $$ = FKCONSTR_ON_KEY_SETNULL; }
+		| SET DEFAULT					{ $$ = FKCONSTR_ON_KEY_SETDEFAULT; }
 		;

 OptInherit:  INHERITS '(' relation_name_list ')'		{ $$ = $3; }
@@ -1329,14 +1395,14 @@ CreateTrigStmt:  CREATE TRIGGER name TriggerActionTime TriggerEvents ON
 				}
 		| CREATE CONSTRAINT TRIGGER name AFTER TriggerOneEvent ON
 				relation_name OptConstrFromTable 
-				OptConstrTrigDeferrable OptConstrTrigInitdeferred
+				ConstraintAttributeSpec
 				FOR EACH ROW EXECUTE PROCEDURE name '(' TriggerFuncArgs ')'
 				{
 					CreateTrigStmt *n = makeNode(CreateTrigStmt);
 					n->trigname = $4;
 					n->relname = $8;
-					n->funcname = $17;
-					n->args = $19;
+					n->funcname = $16;
+					n->args = $18;
 					n->before = false;
 					n->row = true;
 					n->actions[0] = $6;
@@ -1346,22 +1412,9 @@ CreateTrigStmt:  CREATE TRIGGER name TriggerActionTime TriggerEvents ON
 					n->attr = NULL;		/* unused */
 					n->when = NULL;		/* unused */

-					/*
-					 * Check that the DEFERRABLE and INITIALLY combination
-					 * makes sense
-					 */
 					n->isconstraint  = true;
-					if ($11 == 1)
-					{
-						if ($10 == 0)
-							elog(ERROR, "INITIALLY DEFERRED constraint "
-										"cannot be NOT DEFERRABLE");
-						n->deferrable = true;
-						n->initdeferred = true;
-					} else {
-						n->deferrable = ($10 == 1);
-						n->initdeferred = false;
-					}
+					n->deferrable = ($10 & 1) != 0;
+					n->initdeferred = ($10 & 2) != 0;

 					n->constrrelname = $9;
 					$$ = (Node *)n;
@@ -1443,34 +1496,44 @@ OptConstrFromTable:			/* Empty */
 				}
 		;

-OptConstrTrigDeferrable:	/* Empty */
-				{
-					$$ = -1;
-				}
-		| DEFERRABLE
-				{
-					$$ = 1;
-				}
-		| NOT DEFERRABLE
-				{
+ConstraintAttributeSpec: /* Empty */
+			{ $$ = 0; }
+		| ConstraintDeferrabilitySpec
+			{ $$ = $1; }
+		| ConstraintDeferrabilitySpec ConstraintTimeSpec
+			{
+				if ($1 == 0 && $2 != 0)
+					elog(ERROR, "INITIALLY DEFERRED constraint must be DEFERRABLE");
+				$$ = $1 | $2;
+			}
+		| ConstraintTimeSpec
+			{
+				if ($1 != 0)
+					$$ = 3;
+				else
 					$$ = 0;
-				}
+			}
+		| ConstraintTimeSpec ConstraintDeferrabilitySpec
+			{
+				if ($2 == 0 && $1 != 0)
+					elog(ERROR, "INITIALLY DEFERRED constraint must be DEFERRABLE");
+				$$ = $1 | $2;
+			}
 		;

-OptConstrTrigInitdeferred:	/* Empty */
-				{
-					$$ = -1;
-				}
-		| INITIALLY DEFERRED
-				{
-					$$ = 1;
-				}
-		| INITIALLY IMMEDIATE
-				{
-					$$ = 0;
-				}
+ConstraintDeferrabilitySpec: NOT DEFERRABLE
+			{ $$ = 0; }
+		| DEFERRABLE
+			{ $$ = 1; }
 		;

+ConstraintTimeSpec: INITIALLY IMMEDIATE
+			{ $$ = 0; }
+		| INITIALLY DEFERRED
+			{ $$ = 2; }
+		;
+		
+
 DropTrigStmt:  DROP TRIGGER name ON relation_name
 				{
 					DropTrigStmt *n = makeNode(DropTrigStmt);