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/*-------------------------------------------------------------------------
*
* pg_constraint.h
* definition of the "constraint" system catalog (pg_constraint)
*
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/catalog/pg_constraint.h
*
* NOTES
* The Catalog.pm module reads this file and derives schema
* information.
*
*-------------------------------------------------------------------------
*/
#ifndef PG_CONSTRAINT_H
#define PG_CONSTRAINT_H
#include "catalog/dependency.h"
#include "catalog/genbki.h"
#include "catalog/pg_constraint_d.h"
#include "nodes/pg_list.h"
/* ----------------
* pg_constraint definition. cpp turns this into
* typedef struct FormData_pg_constraint
* ----------------
*/
CATALOG(pg_constraint,2606,ConstraintRelationId)
{
Oid oid; /* oid */
/*
* 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
* SQL-spec compatibility.
*
* However, we do require conname to be unique among the constraints of a
* single relation or domain. This is enforced by a unique index on
* conrelid + contypid + conname.
*/
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.
*/
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.
*
* For SQL-style global ASSERTIONs, both conrelid and contypid would be
* 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 */
/*
* If this constraint is on a partition inherited from a partitioned
* table, this is the OID of the corresponding constraint in the parent.
*/
Oid conparentid;
/*
* These fields, plus confkey, are only meaningful for a foreign-key
* 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 */
/*
* Columns of conrelid that the constraint applies to, if known (this is
* NULL for trigger constraints)
*/
int16 conkey[1];
/*
* If a foreign key, the referenced columns of confrelid
*/
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
*/
pg_node_tree conbin;
#endif
} FormData_pg_constraint;
/* ----------------
* Form_pg_constraint corresponds to a pointer to a tuple with
* the format of pg_constraint relation.
* ----------------
*/
typedef FormData_pg_constraint *Form_pg_constraint;
#ifdef EXPOSE_TO_CLIENT_CODE
/* Valid values for contype */
#define CONSTRAINT_CHECK 'c'
#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
* constants defined in parsenodes.h. Valid values for confmatchtype are
* the FKCONSTR_MATCH_xxx constants defined in parsenodes.h.
*/
#endif /* EXPOSE_TO_CLIENT_CODE */
/*
* Identify constraint type for lookup purposes
*/
typedef enum ConstraintCategory
{
CONSTRAINT_RELATION,
CONSTRAINT_DOMAIN,
CONSTRAINT_ASSERTION /* for future expansion */
} ConstraintCategory;
extern Oid CreateConstraintEntry(const char *constraintName,
Oid constraintNamespace,
char constraintType,
bool isDeferrable,
bool isDeferred,
bool isValidated,
Oid parentConstrId,
Oid relId,
const int16 *constraintKey,
int constraintNKeys,
int constraintNTotalKeys,
Oid domainId,
Oid indexRelId,
Oid foreignRelId,
const int16 *foreignKey,
const Oid *pfEqOp,
const Oid *ppEqOp,
const Oid *ffEqOp,
int foreignNKeys,
char foreignUpdateType,
char foreignDeleteType,
char foreignMatchType,
const Oid *exclOp,
Node *conExpr,
const char *conBin,
bool conIsLocal,
int conInhCount,
bool conNoInherit,
bool is_internal);
extern void RemoveConstraintById(Oid conId);
extern void RenameConstraintById(Oid conId, const char *newname);
extern bool ConstraintNameIsUsed(ConstraintCategory conCat, Oid objId,
const char *conname);
extern bool ConstraintNameExists(const char *conname, Oid namespaceid);
extern char *ChooseConstraintName(const char *name1, const char *name2,
const char *label, Oid namespaceid,
List *others);
extern void AlterConstraintNamespaces(Oid ownerId, Oid oldNspId,
Oid newNspId, bool isType, ObjectAddresses *objsMoved);
extern void ConstraintSetParentConstraint(Oid childConstrId,
Oid parentConstrId,
Oid childTableId);
extern Oid get_relation_constraint_oid(Oid relid, const char *conname, bool missing_ok);
extern Bitmapset *get_relation_constraint_attnos(Oid relid, const char *conname,
bool missing_ok, Oid *constraintOid);
extern Oid get_domain_constraint_oid(Oid typid, const char *conname, bool missing_ok);
extern Oid get_relation_idx_constraint_oid(Oid relationId, Oid indexId);
extern Bitmapset *get_primary_key_attnos(Oid relid, bool deferrableOk,
Oid *constraintOid);
extern void DeconstructFkConstraintRow(HeapTuple tuple, int *numfks,
AttrNumber *conkey, AttrNumber *confkey,
Oid *pf_eq_oprs, Oid *pp_eq_oprs, Oid *ff_eq_oprs);
extern bool check_functional_grouping(Oid relid,
Index varno, Index varlevelsup,
List *grouping_columns,
List **constraintDeps);
#endif /* PG_CONSTRAINT_H */
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