mirror of https://github.com/postgres/postgres
This is the first cut toward CREATE CONVERSION/DROP CONVERSION implementaion. The commands can now add/remove tuples to the new pg_conversion system catalog, but that's all. Still need work to make them actually working. Documentations, regression tests also need work.REL7_3_STABLE
Tatsuo Ishii
24 years ago
parent
f2bb1cfa85
commit
fcc962566a
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/*-------------------------------------------------------------------------
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* |
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* pg_conversion.c |
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* routines to support manipulation of the pg_conversion relation |
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* |
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* |
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* IDENTIFICATION |
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* $Header: /cvsroot/pgsql/src/backend/catalog/pg_conversion.c,v 1.1 2002/07/11 07:39:27 ishii Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#include "postgres.h" |
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#include "access/heapam.h" |
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#include "catalog/catname.h" |
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#include "catalog/indexing.h" |
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#include "catalog/pg_conversion.h" |
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#include "catalog/namespace.h" |
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#include "utils/builtins.h" |
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#include "utils/syscache.h" |
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#include "mb/pg_wchar.h" |
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#include "utils/fmgroids.h" |
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#include "utils/acl.h" |
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#include "miscadmin.h" |
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/* ----------------
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* ConversionCreate |
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* --------------- |
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*/ |
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Oid ConversionCreate(const char *conname, Oid connamespace, |
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int32 conowner, |
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int4 conforencoding, int4 contoencoding, |
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Oid conproc, bool def) |
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{ |
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int i; |
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Relation rel; |
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TupleDesc tupDesc; |
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HeapTuple tup; |
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char nulls[Natts_pg_conversion]; |
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Datum values[Natts_pg_conversion]; |
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NameData cname; |
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Oid oid; |
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/* sanity checks */ |
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if (!conname) |
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elog(ERROR, "no conversion name supplied"); |
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/* make sure there is no existing conversion of same name */ |
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if (SearchSysCacheExists(CONNAMESP, |
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PointerGetDatum(conname), |
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ObjectIdGetDatum(connamespace), |
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0,0)) |
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elog(ERROR, "conversion name \"%s\" already exists", conname); |
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if (def) |
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{ |
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/* make sure there is no existing default
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<for encoding><to encoding> pair in this name space */ |
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if (FindDefaultConversion(connamespace, |
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conforencoding, |
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contoencoding)) |
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elog(ERROR, "default conversion for %s to %s already exists", |
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pg_encoding_to_char(conforencoding),pg_encoding_to_char(contoencoding)); |
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} |
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/* open pg_conversion */ |
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rel = heap_openr(ConversionRelationName, RowExclusiveLock); |
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tupDesc = rel->rd_att; |
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/* initialize nulls and values */ |
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for (i = 0; i < Natts_pg_conversion; i++) |
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{ |
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nulls[i] = ' '; |
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values[i] = (Datum) NULL; |
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} |
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/* form a tuple */ |
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namestrcpy(&cname, conname); |
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values[Anum_pg_conversion_conname - 1] = NameGetDatum(&cname); |
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values[Anum_pg_conversion_connamespace - 1] = ObjectIdGetDatum(connamespace); |
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values[Anum_pg_conversion_conowner - 1] = Int32GetDatum(conowner); |
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values[Anum_pg_conversion_conforencoding - 1] = Int32GetDatum(conforencoding); |
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values[Anum_pg_conversion_contoencoding - 1] = Int32GetDatum(contoencoding); |
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values[Anum_pg_conversion_conproc - 1] = ObjectIdGetDatum(conproc); |
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values[Anum_pg_conversion_condefault - 1] = BoolGetDatum(def); |
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tup = heap_formtuple(tupDesc, values, nulls); |
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/* insert a new tuple */ |
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oid = simple_heap_insert(rel, tup); |
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Assert(OidIsValid(oid)); |
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/* update the index if any */ |
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if (RelationGetForm(rel)->relhasindex) |
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{ |
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Relation idescs[Num_pg_conversion_indices]; |
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CatalogOpenIndices(Num_pg_conversion_indices, Name_pg_conversion_indices, idescs); |
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CatalogIndexInsert(idescs, Num_pg_conversion_indices, rel, tup); |
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CatalogCloseIndices(Num_pg_conversion_indices, idescs); |
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} |
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heap_close(rel, RowExclusiveLock); |
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return oid; |
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} |
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/* ----------------
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* ConversionDrop |
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* --------------- |
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*/ |
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void ConversionDrop(const char *conname, Oid connamespace, int32 conowner) |
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{ |
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Relation rel; |
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TupleDesc tupDesc; |
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HeapTuple tuple; |
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HeapScanDesc scan; |
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ScanKeyData scanKeyData; |
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Form_pg_conversion body; |
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/* sanity checks */ |
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if (!conname) |
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elog(ERROR, "no conversion name supplied"); |
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ScanKeyEntryInitialize(&scanKeyData, |
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0, |
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Anum_pg_conversion_connamespace, |
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F_OIDEQ, |
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ObjectIdGetDatum(connamespace)); |
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/* open pg_conversion */ |
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rel = heap_openr(ConversionRelationName, RowExclusiveLock); |
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tupDesc = rel->rd_att; |
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scan = heap_beginscan(rel, SnapshotNow, |
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1, &scanKeyData); |
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/* search for the target tuple */ |
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while (HeapTupleIsValid(tuple = heap_getnext(scan, ForwardScanDirection))) |
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{ |
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body = (Form_pg_conversion)GETSTRUCT(tuple); |
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if (!strncmp(NameStr(body->conname), conname, NAMEDATALEN)) |
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break; |
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} |
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if (!HeapTupleIsValid(tuple)) |
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{ |
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elog(ERROR, "conversion %s not found", conname); |
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return; |
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} |
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if (!superuser() && ((Form_pg_conversion)GETSTRUCT(tuple))->conowner != GetUserId()) |
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elog(ERROR, "permission denied"); |
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simple_heap_delete(rel, &tuple->t_self); |
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heap_endscan(scan); |
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heap_close(rel, RowExclusiveLock); |
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} |
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/* ----------------
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* FindDefaultConversion |
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* |
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* find default conversion proc by for_encoding and to_encoding in this name space |
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* --------------- |
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*/ |
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Oid FindDefaultConversion(Oid name_space, int4 for_encoding, int4 to_encoding) |
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{ |
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Relation rel; |
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HeapScanDesc scan; |
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ScanKeyData scanKeyData; |
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HeapTuple tuple; |
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Form_pg_conversion body; |
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Oid proc = InvalidOid; |
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/* Check we have usage rights in target namespace */ |
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if (pg_namespace_aclcheck(name_space, GetUserId(), ACL_USAGE) != ACLCHECK_OK) |
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return InvalidOid; |
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ScanKeyEntryInitialize(&scanKeyData, |
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0, |
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Anum_pg_conversion_connamespace, |
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F_OIDEQ, |
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ObjectIdGetDatum(name_space)); |
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rel = heap_openr(ConversionRelationName, AccessShareLock); |
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scan = heap_beginscan(rel, SnapshotNow, |
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1, &scanKeyData); |
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while (HeapTupleIsValid(tuple = heap_getnext(scan, ForwardScanDirection))) |
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{ |
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body = (Form_pg_conversion)GETSTRUCT(tuple); |
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if (body->conforencoding == for_encoding && |
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body->conforencoding == to_encoding && |
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body->condefault == TRUE) { |
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proc = body->conproc; |
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break; |
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} |
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} |
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heap_endscan(scan); |
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heap_close(rel, AccessShareLock); |
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return proc; |
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} |
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/* ----------------
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* FindConversionByName |
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* |
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* find conversion proc by possibly qualified conversion name. |
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* --------------- |
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*/ |
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Oid FindConversionByName(List *name) |
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{ |
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HeapTuple tuple; |
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char *conversion_name; |
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Oid namespaceId; |
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Oid procoid; |
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AclResult aclresult; |
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/* Convert list of names to a name and namespace */ |
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namespaceId = QualifiedNameGetCreationNamespace(name, &conversion_name); |
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/* Check we have usage rights in target namespace */ |
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if (pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_USAGE) != ACLCHECK_OK) |
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return InvalidOid; |
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/* search pg_conversion by namespaceId and conversion name */ |
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tuple = SearchSysCache(CONNAMESP, |
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PointerGetDatum(conversion_name), |
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ObjectIdGetDatum(namespaceId), |
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0,0); |
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if (!HeapTupleIsValid(tuple)) |
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return InvalidOid; |
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procoid = ((Form_pg_conversion)GETSTRUCT(tuple))->conproc; |
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ReleaseSysCache(tuple); |
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/* Check we have execute rights for the function */ |
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aclresult = pg_proc_aclcheck(procoid, GetUserId(), ACL_EXECUTE); |
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if (aclresult != ACLCHECK_OK) |
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return InvalidOid; |
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return procoid; |
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} |
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@ -0,0 +1,112 @@ |
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/*-------------------------------------------------------------------------
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* |
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* conversionmacmds.c |
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* conversion creation command support code |
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* |
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* |
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* IDENTIFICATION |
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* $Header: /cvsroot/pgsql/src/backend/commands/conversioncmds.c,v 1.1 2002/07/11 07:39:27 ishii Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#include "postgres.h" |
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#include "catalog/pg_conversion.h" |
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#include "catalog/catalog.h" |
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#include "catalog/namespace.h" |
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#include "catalog/pg_type.h" |
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#include "mb/pg_wchar.h" |
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#include "commands/conversioncmds.h" |
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#include "miscadmin.h" |
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#include "parser/parse_func.h" |
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#include "utils/acl.h" |
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#include "utils/lsyscache.h" |
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/*
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* CREATE CONVERSION |
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*/ |
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void |
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CreateConversionCommand(CreateConversionStmt *stmt) |
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{ |
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Oid namespaceId; |
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char *conversion_name; |
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AclResult aclresult; |
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int for_encoding; |
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int to_encoding; |
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Oid funcoid; |
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Oid funcnamespace; |
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char *dummy; |
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const char *for_encoding_name = stmt->for_encoding_name; |
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const char *to_encoding_name = stmt->to_encoding_name; |
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List *func_name = stmt->func_name; |
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static Oid funcargs[] = {INT4OID, INT4OID, 0, 0, INT4OID}; |
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/* Convert list of names to a name and namespace */ |
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namespaceId = QualifiedNameGetCreationNamespace(stmt->conversion_name, &conversion_name); |
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/* Check we have creation rights in target namespace */ |
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aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE); |
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if (aclresult != ACLCHECK_OK) |
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aclcheck_error(aclresult, get_namespace_name(namespaceId)); |
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/* Check the encoding names */ |
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for_encoding = pg_char_to_encoding(for_encoding_name); |
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if (for_encoding < 0) |
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elog(ERROR, "Invalid for encoding name: %s", for_encoding_name); |
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to_encoding = pg_char_to_encoding(to_encoding_name); |
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if (to_encoding < 0) |
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elog(ERROR, "Invalid to encoding name: %s", to_encoding_name); |
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/* Check the existence of the conversion function.
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* Function name could be a qualified name. |
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*/ |
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funcoid = LookupFuncName(func_name, sizeof(funcargs)/sizeof(Oid), funcargs); |
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if (!OidIsValid(funcoid)) |
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elog(ERROR, "Function %s does not exist", NameListToString(func_name)); |
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/* Check the rights for this function and name space */ |
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funcnamespace = QualifiedNameGetCreationNamespace(func_name, &dummy); |
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aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_USAGE); |
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if (aclresult != ACLCHECK_OK) |
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aclcheck_error(aclresult, get_namespace_name(funcnamespace)); |
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aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE); |
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if (aclresult != ACLCHECK_OK) |
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aclcheck_error(aclresult, get_namespace_name(funcnamespace)); |
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/* All seem ok, go ahead (possible failure would be a duplicate conversion name) */ |
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ConversionCreate(conversion_name, namespaceId, GetUserId(), |
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for_encoding, to_encoding, funcoid, stmt->def); |
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} |
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/*
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* DROP CONVERSION |
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*/ |
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void |
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DropConversionCommand(List *name) |
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{ |
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Oid namespaceId; |
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char *conversion_name; |
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AclResult aclresult; |
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/* Convert list of names to a name and namespace */ |
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namespaceId = QualifiedNameGetCreationNamespace(name, &conversion_name); |
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/* Check we have creation rights in target namespace */ |
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aclresult = pg_namespace_aclcheck(namespaceId, GetUserId(), ACL_CREATE); |
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if (aclresult != ACLCHECK_OK) |
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aclcheck_error(aclresult, get_namespace_name(namespaceId)); |
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/* Go ahead (possible failure would be:
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* none existing conversion |
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* not ower of this conversion |
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*/ |
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ConversionDrop(conversion_name, namespaceId, GetUserId()); |
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} |
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@ -0,0 +1,93 @@ |
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/*-------------------------------------------------------------------------
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* |
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* pg_conversion.h |
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* definition of the system "conversion" relation (pg_conversion) |
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* along with the relation's initial contents. |
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* |
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* |
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* $Id: pg_conversion.h,v 1.1 2002/07/11 07:39:27 ishii Exp $ |
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* |
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* NOTES |
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* the genbki.sh script reads this file and generates .bki |
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* information from the DATA() statements. |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef PG_CONVERSION_H |
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#define PG_CONVERSION_H |
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/* ----------------
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* postgres.h contains the system type definitions and the |
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* CATALOG(), BOOTSTRAP and DATA() sugar words so this file |
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* can be read by both genbki.sh and the C compiler. |
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* ---------------- |
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*/ |
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/* ----------------------------------------------------------------
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* pg_conversion definition. |
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* |
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* cpp turns this into typedef struct FormData_pg_namespace |
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* |
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* conname name of the conversion |
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* connamespace name space which the conversion belongs to |
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* conowner ower of the conversion |
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* conforencoding FOR encoding id |
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* contoencoding TO encoding id |
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* conproc OID of the conversion proc |
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* condefault TRUE is this is a default conversion |
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* ---------------------------------------------------------------- |
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*/ |
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CATALOG(pg_conversion) |
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{ |
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NameData conname; |
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Oid connamespace; |
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int4 conowner; |
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int4 conforencoding; |
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int4 contoencoding; |
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regproc conproc; |
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bool condefault; |
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} FormData_pg_conversion; |
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/* ----------------
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* Form_pg_conversion corresponds to a pointer to a tuple with |
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* the format of pg_conversion relation. |
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* ---------------- |
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*/ |
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typedef FormData_pg_conversion *Form_pg_conversion; |
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/* ----------------
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* compiler constants for pg_conversion |
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* ---------------- |
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*/ |
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#define Natts_pg_conversion 7 |
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#define Anum_pg_conversion_conname 1 |
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#define Anum_pg_conversion_connamespace 2 |
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#define Anum_pg_conversion_conowner 3 |
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#define Anum_pg_conversion_conforencoding 4 |
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#define Anum_pg_conversion_contoencoding 5 |
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#define Anum_pg_conversion_conproc 6 |
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#define Anum_pg_conversion_condefault 7 |
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/* ----------------
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* initial contents of pg_conversion |
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* --------------- |
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*/ |
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/*
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* prototypes for functions in pg_conversion.c |
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*/ |
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#include "nodes/pg_list.h" |
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extern Oid ConversionCreate(const char *conname, Oid connamespace, |
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int32 conowner, |
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int4 conforencoding, int4 contoencoding, |
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Oid conproc, bool def); |
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extern void ConversionDrop(const char *conname, Oid connamespace, int32 conowner); |
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extern Oid FindDefaultConversion(Oid name_space, int4 for_encoding, int4 to_encoding); |
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extern Oid FindConversionByName(List *conname); |
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#endif /* PG_CONVERSION_H */ |
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@ -0,0 +1,23 @@ |
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/*-------------------------------------------------------------------------
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* |
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* conversioncmds.h |
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* prototypes for conversioncmds.c. |
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* |
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* |
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group |
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* Portions Copyright (c) 1994, Regents of the University of California |
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* |
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* $Id: conversioncmds.h,v 1.1 2002/07/11 07:39:27 ishii Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef CONVERSIONCMDS_H |
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#define CONVERSIONCMDS_H |
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#include "nodes/parsenodes.h" |
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extern void CreateConversionCommand(CreateConversionStmt *parsetree); |
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extern void DropConversionCommand(List *conversion_name); |
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#endif /* CONVERSIONCMDS_H */ |
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Reference in new issue