pg_cast.h File Reference

#include "catalog/dependency.h"
#include "catalog/genbki.h"
#include "catalog/pg_cast_d.h"

Include dependency graph for pg_cast.h:

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Go to the source code of this file.

Typedefs
typedef FormData_pg_cast *	Form_pg_cast

Functions
	CATALOG (pg_cast, 2605, CastRelationId)
ObjectAddress	CastCreate (Oid sourcetypeid, Oid targettypeid, Oid funcid, char castcontext, char castmethod, DependencyType behavior)

Variables
	FormData_pg_cast

Typedef Documentation

Form_pg_cast

typedef FormData_pg_cast* Form_pg_cast

Definition at line 57 of file pg_cast.h.

Function Documentation

CastCreate()

ObjectAddress CastCreate	(	Oid	sourcetypeid,
		Oid	targettypeid,
		Oid	funcid,
		char	castcontext,
		char	castmethod,
		DependencyType	behavior
	)

Definition at line 43 of file pg_cast.c.

References CastOidIndexId, CASTSOURCETARGET, CatalogTupleInsert(), CharGetDatum, ObjectAddress::classId, ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errmsg(), ERROR, format_type_be(), GetNewOidWithIndex(), heap_form_tuple(), heap_freetuple(), HeapTupleIsValid, InvokeObjectPostCreateHook, MemSet, ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, OidIsValid, recordDependencyOn(), recordDependencyOnCurrentExtension(), RelationGetDescr, RowExclusiveLock, SearchSysCache2(), table_close(), table_open(), and values.

Referenced by CreateCast().

{
    Relation    relation;
    HeapTuple   tuple;
    Oid         castid;
    Datum       values[Natts_pg_cast];
    bool        nulls[Natts_pg_cast];
    ObjectAddress myself,
                referenced;

    relation = table_open(CastRelationId, RowExclusiveLock);

    /*
     * Check for duplicate.  This is just to give a friendly error message,
     * the unique index would catch it anyway (so no need to sweat about race
     * conditions).
     */
    tuple = SearchSysCache2(CASTSOURCETARGET,
                            ObjectIdGetDatum(sourcetypeid),
                            ObjectIdGetDatum(targettypeid));
    if (HeapTupleIsValid(tuple))
        ereport(ERROR,
                (errcode(ERRCODE_DUPLICATE_OBJECT),
                 errmsg("cast from type %s to type %s already exists",
                        format_type_be(sourcetypeid),
                        format_type_be(targettypeid))));

    /* ready to go */
    castid = GetNewOidWithIndex(relation, CastOidIndexId, Anum_pg_cast_oid);
    values[Anum_pg_cast_oid - 1] = ObjectIdGetDatum(castid);
    values[Anum_pg_cast_castsource - 1] = ObjectIdGetDatum(sourcetypeid);
    values[Anum_pg_cast_casttarget - 1] = ObjectIdGetDatum(targettypeid);
    values[Anum_pg_cast_castfunc - 1] = ObjectIdGetDatum(funcid);
    values[Anum_pg_cast_castcontext - 1] = CharGetDatum(castcontext);
    values[Anum_pg_cast_castmethod - 1] = CharGetDatum(castmethod);

    MemSet(nulls, false, sizeof(nulls));

    tuple = heap_form_tuple(RelationGetDescr(relation), values, nulls);

    CatalogTupleInsert(relation, tuple);

    /* make dependency entries */
    myself.classId = CastRelationId;
    myself.objectId = castid;
    myself.objectSubId = 0;

    /* dependency on source type */
    referenced.classId = TypeRelationId;
    referenced.objectId = sourcetypeid;
    referenced.objectSubId = 0;
    recordDependencyOn(&myself, &referenced, behavior);

    /* dependency on target type */
    referenced.classId = TypeRelationId;
    referenced.objectId = targettypeid;
    referenced.objectSubId = 0;
    recordDependencyOn(&myself, &referenced, behavior);

    /* dependency on function */
    if (OidIsValid(funcid))
    {
        referenced.classId = ProcedureRelationId;
        referenced.objectId = funcid;
        referenced.objectSubId = 0;
        recordDependencyOn(&myself, &referenced, behavior);
    }

    /* dependency on extension */
    recordDependencyOnCurrentExtension(&myself, false);

    /* Post creation hook for new cast */
    InvokeObjectPostCreateHook(CastRelationId, castid, 0);

    heap_freetuple(tuple);

    table_close(relation, RowExclusiveLock);

    return myself;
}

CATALOG()

CATALOG	(	pg_cast	,
		2605	,
		CastRelationId
	)

Definition at line 32 of file pg_cast.h.

References BKI_LOOKUP.

{
    Oid         oid;            /* oid */

    /* source datatype for cast */
    Oid         castsource BKI_LOOKUP(pg_type);

    /* destination datatype for cast */
    Oid         casttarget BKI_LOOKUP(pg_type);

    /* cast function; 0 = binary coercible */
    Oid         castfunc BKI_LOOKUP(pg_proc);

    /* contexts in which cast can be used */
    char        castcontext;

    /* cast method */
    char        castmethod;
} FormData_pg_cast;

Variable Documentation

FormData_pg_cast

FormData_pg_cast

Definition at line 50 of file pg_cast.h.