EVOLUTION-NINJA

Edit File: pg_constraint.h

/*------------------------------------------------------------------------- * * pg_constraint.h * definition of the system "constraint" relation (pg_constraint) * along with the relation's initial contents. * * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/catalog/pg_constraint.h * * NOTES * the genbki.pl script reads this file and generates .bki * information from the DATA() statements. * *------------------------------------------------------------------------- */ #ifndef PG_CONSTRAINT_H #define PG_CONSTRAINT_H #include "catalog/genbki.h" #include "catalog/dependency.h" #include "nodes/pg_list.h" /* ---------------- * pg_constraint definition. cpp turns this into * typedef struct FormData_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 * 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. */ 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 */ /* * 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) */ int4 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) */ int2 conkey[1]; /* * If a foreign key, the referenced columns of confrelid */ int2 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; /* * If a check constraint, source-text representation of expression */ text consrc; #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; /* ---------------- * compiler constants for pg_constraint * ---------------- */ #define Natts_pg_constraint 24 #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_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_confkey 18 #define Anum_pg_constraint_conpfeqop 19 #define Anum_pg_constraint_conppeqop 20 #define Anum_pg_constraint_conffeqop 21 #define Anum_pg_constraint_conexclop 22 #define Anum_pg_constraint_conbin 23 #define Anum_pg_constraint_consrc 24 /* 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. */ /* * 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, bool isValidated, Oid relId, const int16 *constraintKey, int constraintNKeys, 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, const char *conSrc, bool conIsLocal, int conInhCount, bool conNoInherit); extern void RemoveConstraintById(Oid conId); extern void RenameConstraintById(Oid conId, const char *newname); extern void SetValidatedConstraintById(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 namespaceid, List *others); extern void AlterConstraintNamespaces(Oid ownerId, Oid oldNspId, Oid newNspId, bool isType, ObjectAddresses *objsMoved); extern void get_constraint_relation_oids(Oid constraint_oid, Oid *conrelid, Oid *confrelid); extern Oid get_relation_constraint_oid(Oid relid, const char *conname, bool missing_ok); extern Oid get_domain_constraint_oid(Oid typid, const char *conname, bool missing_ok); extern bool check_functional_grouping(Oid relid, Index varno, Index varlevelsup, List *grouping_columns, List **constraintDeps); #endif /* PG_CONSTRAINT_H */