* along with the relation's initial contents.
*
*
- * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/catalog/pg_constraint.h,v 1.15 2005/03/25 21:57:59 tgl Exp $
+ * src/include/catalog/pg_constraint.h
*
* NOTES
- * the genbki.sh script reads this file and generates .bki
+ * the genbki.pl script reads this file and generates .bki
* information from the DATA() statements.
*
*-------------------------------------------------------------------------
#ifndef PG_CONSTRAINT_H
#define PG_CONSTRAINT_H
-/* ----------------
- * postgres.h contains the system type definitions and the
- * CATALOG(), BOOTSTRAP and DATA() sugar words so this file
- * can be read by both genbki.sh and the C compiler.
- * ----------------
- */
+#include "catalog/genbki.h"
/* ----------------
* pg_constraint definition. cpp turns this into
* typedef struct FormData_pg_constraint
* ----------------
*/
-CATALOG(pg_constraint)
+#define ConstraintRelationId 2606
+
+CATALOG(pg_constraint,2606)
{
/*
* conname + connamespace is deliberately not unique; we allow, for
* example, the same name to be used for constraints of different
* relations. This is partly for backwards compatibility with past
- * Postgres practice, and partly because we don't want to have to
- * obtain a global lock to generate a globally unique name for a
- * nameless constraint. We associate a namespace with constraint
- * names only for SQL92 compatibility.
+ * Postgres practice, and partly because we don't want to have to obtain a
+ * global lock to generate a globally unique name for a nameless
+ * constraint. We associate a namespace with constraint names only for
+ * SQL-spec compatibility.
*/
NameData conname; /* name of this constraint */
Oid connamespace; /* OID of namespace containing constraint */
char contype; /* constraint type; see codes below */
bool condeferrable; /* deferrable constraint? */
bool condeferred; /* deferred by default? */
+ bool convalidated; /* constraint has been validated? */
/*
- * conrelid and conkey are only meaningful if the constraint applies
- * to a specific relation (this excludes domain constraints and
- * assertions). Otherwise conrelid is 0 and conkey is NULL.
+ * conrelid and conkey are only meaningful if the constraint applies to a
+ * specific relation (this excludes domain constraints and assertions).
+ * Otherwise conrelid is 0 and conkey is NULL.
*/
Oid conrelid; /* relation this constraint constrains */
/*
* contypid links to the pg_type row for a domain if this is a domain
- * constraint. Otherwise it's 0.
+ * constraint. Otherwise it's 0.
*
* For SQL-style global ASSERTIONs, both conrelid and contypid would be
- * zero. This is not presently supported, however.
+ * zero. This is not presently supported, however.
*/
Oid contypid; /* domain this constraint constrains */
+ /*
+ * conindid links to the index supporting the constraint, if any;
+ * otherwise it's 0. This is used for unique, primary-key, and exclusion
+ * constraints, and less obviously for foreign-key constraints (where the
+ * index is a unique index on the referenced relation's referenced
+ * columns). Notice that the index is on conrelid in the first case but
+ * confrelid in the second.
+ */
+ Oid conindid; /* index supporting this constraint */
+
/*
* These fields, plus confkey, are only meaningful for a foreign-key
- * constraint. Otherwise confrelid is 0 and the char fields are
- * spaces.
+ * constraint. Otherwise confrelid is 0 and the char fields are spaces.
*/
Oid confrelid; /* relation referenced by foreign key */
char confupdtype; /* foreign key's ON UPDATE action */
char confdeltype; /* foreign key's ON DELETE action */
char confmatchtype; /* foreign key's match type */
+ /* Has a local definition (hence, do not drop when coninhcount is 0) */
+ bool conislocal;
+
+ /* Number of times inherited from direct parent relation(s) */
+ int32 coninhcount;
+
+ /* Has a local definition and cannot be inherited */
+ bool connoinherit;
+
+#ifdef CATALOG_VARLEN /* variable-length fields start here */
+
/*
- * VARIABLE LENGTH FIELDS start here. These fields may be NULL, too.
+ * Columns of conrelid that the constraint applies to, if known (this is
+ * NULL for trigger constraints)
*/
+ int16 conkey[1];
/*
- * Columns of conrelid that the constraint applies to
+ * Columns of conrelid that the constraint does not apply to,
+ * but included into the same index with key columns.
*/
- int2 conkey[1];
+ int16 conincluding[1];
/*
* If a foreign key, the referenced columns of confrelid
*/
- int2 confkey[1];
+ int16 confkey[1];
+
+ /*
+ * If a foreign key, the OIDs of the PK = FK equality operators for each
+ * column of the constraint
+ */
+ Oid conpfeqop[1];
+
+ /*
+ * If a foreign key, the OIDs of the PK = PK equality operators for each
+ * column of the constraint (i.e., equality for the referenced columns)
+ */
+ Oid conppeqop[1];
+
+ /*
+ * If a foreign key, the OIDs of the FK = FK equality operators for each
+ * column of the constraint (i.e., equality for the referencing columns)
+ */
+ Oid conffeqop[1];
+
+ /*
+ * If an exclusion constraint, the OIDs of the exclusion operators for
+ * each column of the constraint
+ */
+ Oid conexclop[1];
/*
* If a check constraint, nodeToString representation of expression
*/
- text conbin;
+ pg_node_tree conbin;
/*
* If a check constraint, source-text representation of expression
*/
text consrc;
+#endif
} FormData_pg_constraint;
/* ----------------
* compiler constants for pg_constraint
* ----------------
*/
-#define Natts_pg_constraint 15
+#define Natts_pg_constraint 25
#define Anum_pg_constraint_conname 1
#define Anum_pg_constraint_connamespace 2
#define Anum_pg_constraint_contype 3
#define Anum_pg_constraint_condeferrable 4
#define Anum_pg_constraint_condeferred 5
-#define Anum_pg_constraint_conrelid 6
-#define Anum_pg_constraint_contypid 7
-#define Anum_pg_constraint_confrelid 8
-#define Anum_pg_constraint_confupdtype 9
-#define Anum_pg_constraint_confdeltype 10
-#define Anum_pg_constraint_confmatchtype 11
-#define Anum_pg_constraint_conkey 12
-#define Anum_pg_constraint_confkey 13
-#define Anum_pg_constraint_conbin 14
-#define Anum_pg_constraint_consrc 15
+#define Anum_pg_constraint_convalidated 6
+#define Anum_pg_constraint_conrelid 7
+#define Anum_pg_constraint_contypid 8
+#define Anum_pg_constraint_conindid 9
+#define Anum_pg_constraint_confrelid 10
+#define Anum_pg_constraint_confupdtype 11
+#define Anum_pg_constraint_confdeltype 12
+#define Anum_pg_constraint_confmatchtype 13
+#define Anum_pg_constraint_conislocal 14
+#define Anum_pg_constraint_coninhcount 15
+#define Anum_pg_constraint_connoinherit 16
+#define Anum_pg_constraint_conkey 17
+#define Anum_pg_constraint_conincluding 18
+#define Anum_pg_constraint_confkey 19
+#define Anum_pg_constraint_conpfeqop 20
+#define Anum_pg_constraint_conppeqop 21
+#define Anum_pg_constraint_conffeqop 22
+#define Anum_pg_constraint_conexclop 23
+#define Anum_pg_constraint_conbin 24
+#define Anum_pg_constraint_consrc 25
+
+/* ----------------
+ * initial contents of pg_constraint
+ * ----------------
+ */
+
+/* nothing, at present */
/* Valid values for contype */
#define CONSTRAINT_FOREIGN 'f'
#define CONSTRAINT_PRIMARY 'p'
#define CONSTRAINT_UNIQUE 'u'
+#define CONSTRAINT_TRIGGER 't'
+#define CONSTRAINT_EXCLUSION 'x'
/*
* Valid values for confupdtype and confdeltype are the FKCONSTR_ACTION_xxx
* the FKCONSTR_MATCH_xxx constants defined in parsenodes.h.
*/
-/*
- * Identify constraint type for lookup purposes
- */
-typedef enum ConstraintCategory
-{
- CONSTRAINT_RELATION,
- CONSTRAINT_DOMAIN,
- CONSTRAINT_ASSERTION /* for future expansion */
-} ConstraintCategory;
-
-/*
- * prototypes for functions in pg_constraint.c
- */
-extern Oid CreateConstraintEntry(const char *constraintName,
- Oid constraintNamespace,
- char constraintType,
- bool isDeferrable,
- bool isDeferred,
- Oid relId,
- const int16 *constraintKey,
- int constraintNKeys,
- Oid domainId,
- Oid foreignRelId,
- const int16 *foreignKey,
- int foreignNKeys,
- char foreignUpdateType,
- char foreignDeleteType,
- char foreignMatchType,
- Oid indexRelId,
- Node *conExpr,
- const char *conBin,
- const char *conSrc);
-
-extern void RemoveConstraintById(Oid conId);
-
-extern bool ConstraintNameIsUsed(ConstraintCategory conCat, Oid objId,
- Oid objNamespace, const char *conname);
-extern char *ChooseConstraintName(const char *name1, const char *name2,
- const char *label, Oid namespace,
- List *others);
-
-extern char *GetConstraintNameForTrigger(Oid triggerId);
-
#endif /* PG_CONSTRAINT_H */
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