pg_conversion.c File Reference

#include "postgres.h"
#include "access/htup_details.h"
#include "access/table.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/objectaccess.h"
#include "catalog/pg_conversion.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_proc.h"
#include "mb/pg_wchar.h"
#include "utils/builtins.h"
#include "utils/catcache.h"
#include "utils/rel.h"
#include "utils/syscache.h"

Include dependency graph for pg_conversion.c:

Go to the source code of this file.

Functions
ObjectAddress	ConversionCreate (const char *conname, Oid connamespace, Oid conowner, int32 conforencoding, int32 contoencoding, Oid conproc, bool def)
Oid	FindDefaultConversion (Oid name_space, int32 for_encoding, int32 to_encoding)

Function Documentation

ConversionCreate()

ObjectAddress ConversionCreate	(	const char *	conname,
		Oid	connamespace,
		Oid	conowner,
		int32	conforencoding,
		int32	contoencoding,
		Oid	conproc,
		bool	def
	)

Definition at line 38 of file pg_conversion.c.

{
    int         i;
    Relation    rel;
    TupleDesc   tupDesc;
    HeapTuple   tup;
    Oid         oid;
    bool        nulls[Natts_pg_conversion];
    Datum       values[Natts_pg_conversion];
    NameData    cname;
    ObjectAddress myself,
                referenced;
 
    /* sanity checks */
    if (!conname)
        elog(ERROR, "no conversion name supplied");
 
    /* make sure there is no existing conversion of same name */
    if (SearchSysCacheExists2(CONNAMENSP,
                              PointerGetDatum(conname),
                              ObjectIdGetDatum(connamespace)))
        ereport(ERROR,
                (errcode(ERRCODE_DUPLICATE_OBJECT),
                 errmsg("conversion \"%s\" already exists", conname)));
 
    if (def)
    {
        /*
         * make sure there is no existing default <for encoding><to encoding>
         * pair in this name space
         */
        if (FindDefaultConversion(connamespace,
                                  conforencoding,
                                  contoencoding))
            ereport(ERROR,
                    (errcode(ERRCODE_DUPLICATE_OBJECT),
                     errmsg("default conversion for %s to %s already exists",
                            pg_encoding_to_char(conforencoding),
                            pg_encoding_to_char(contoencoding))));
    }
 
    /* open pg_conversion */
    rel = table_open(ConversionRelationId, RowExclusiveLock);
    tupDesc = rel->rd_att;
 
    /* initialize nulls and values */
    for (i = 0; i < Natts_pg_conversion; i++)
    {
        nulls[i] = false;
        values[i] = (Datum) 0;
    }
 
    /* form a tuple */
    namestrcpy(&cname, conname);
    oid = GetNewOidWithIndex(rel, ConversionOidIndexId,
                             Anum_pg_conversion_oid);
    values[Anum_pg_conversion_oid - 1] = ObjectIdGetDatum(oid);
    values[Anum_pg_conversion_conname - 1] = NameGetDatum(&cname);
    values[Anum_pg_conversion_connamespace - 1] = ObjectIdGetDatum(connamespace);
    values[Anum_pg_conversion_conowner - 1] = ObjectIdGetDatum(conowner);
    values[Anum_pg_conversion_conforencoding - 1] = Int32GetDatum(conforencoding);
    values[Anum_pg_conversion_contoencoding - 1] = Int32GetDatum(contoencoding);
    values[Anum_pg_conversion_conproc - 1] = ObjectIdGetDatum(conproc);
    values[Anum_pg_conversion_condefault - 1] = BoolGetDatum(def);
 
    tup = heap_form_tuple(tupDesc, values, nulls);
 
    /* insert a new tuple */
    CatalogTupleInsert(rel, tup);
 
    myself.classId = ConversionRelationId;
    myself.objectId = oid;
    myself.objectSubId = 0;
 
    /* create dependency on conversion procedure */
    referenced.classId = ProcedureRelationId;
    referenced.objectId = conproc;
    referenced.objectSubId = 0;
    recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
 
    /* create dependency on namespace */
    referenced.classId = NamespaceRelationId;
    referenced.objectId = connamespace;
    referenced.objectSubId = 0;
    recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
 
    /* create dependency on owner */
    recordDependencyOnOwner(ConversionRelationId, oid, conowner);
 
    /* dependency on extension */
    recordDependencyOnCurrentExtension(&myself, false);
 
    /* Post creation hook for new conversion */
    InvokeObjectPostCreateHook(ConversionRelationId, oid, 0);
 
    heap_freetuple(tup);
    table_close(rel, RowExclusiveLock);
 
    return myself;
}

References BoolGetDatum(), CatalogTupleInsert(), ObjectAddress::classId, DEPENDENCY_NORMAL, elog, ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errmsg(), ERROR, FindDefaultConversion(), GetNewOidWithIndex(), heap_form_tuple(), heap_freetuple(), i, Int32GetDatum(), InvokeObjectPostCreateHook, NameGetDatum(), namestrcpy(), ObjectAddress::objectId, ObjectIdGetDatum(), ObjectAddress::objectSubId, pg_encoding_to_char, PointerGetDatum(), RelationData::rd_att, recordDependencyOn(), recordDependencyOnCurrentExtension(), recordDependencyOnOwner(), RowExclusiveLock, SearchSysCacheExists2, table_close(), table_open(), and values.

Referenced by CreateConversionCommand().

FindDefaultConversion()

Oid FindDefaultConversion	(	Oid	name_space,
		int32	for_encoding,
		int32	to_encoding
	)

Definition at line 152 of file pg_conversion.c.

{
    CatCList   *catlist;
    HeapTuple   tuple;
    Form_pg_conversion body;
    Oid         proc = InvalidOid;
    int         i;
 
    catlist = SearchSysCacheList3(CONDEFAULT,
                                  ObjectIdGetDatum(name_space),
                                  Int32GetDatum(for_encoding),
                                  Int32GetDatum(to_encoding));
 
    for (i = 0; i < catlist->n_members; i++)
    {
        tuple = &catlist->members[i]->tuple;
        body = (Form_pg_conversion) GETSTRUCT(tuple);
        if (body->condefault)
        {
            proc = body->conproc;
            break;
        }
    }
    ReleaseSysCacheList(catlist);
    return proc;
}

References GETSTRUCT(), i, Int32GetDatum(), InvalidOid, catclist::members, catclist::n_members, ObjectIdGetDatum(), ReleaseSysCacheList, SearchSysCacheList3, and catctup::tuple.

Referenced by ConversionCreate(), and FindDefaultConversionProc().