mirror of https://github.com/postgres/postgres
Consolidate tables of known system attributes into one table.
This commit is contained in:
Tom Lane
parent
b00c6c841f
commit
c59839ac6d
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.177 2001/10/06 23:21:43 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.178 2001/10/22 22:47:57 tgl Exp $
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*
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*
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* INTERFACE ROUTINES
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@ -151,6 +151,7 @@ static Form_pg_attribute SysAtt[] = {&a1, &a2, &a3, &a4, &a5, &a6, &a7};
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/*
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* This function returns a Form_pg_attribute pointer for a system attribute.
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* Note that we elog if the presented attno is invalid.
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*/
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Form_pg_attribute
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SystemAttributeDefinition(AttrNumber attno, bool relhasoids)
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@ -164,6 +165,30 @@ SystemAttributeDefinition(AttrNumber attno, bool relhasoids)
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return SysAtt[-attno - 1];
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}
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/*
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* If the given name is a system attribute name, return a Form_pg_attribute
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* pointer for a prototype definition. If not, return NULL.
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*/
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Form_pg_attribute
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SystemAttributeByName(const char *attname, bool relhasoids)
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{
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int j;
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for (j = 0; j < (int) lengthof(SysAtt); j++)
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{
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Form_pg_attribute att = SysAtt[j];
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if (relhasoids || att->attnum != ObjectIdAttributeNumber)
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{
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if (strcmp(NameStr(att->attname), attname) == 0)
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return att;
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}
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}
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return NULL;
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}
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/* ----------------------------------------------------------------
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* XXX END OF UGLY HARD CODED BADNESS XXX
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* ---------------------------------------------------------------- */
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@ -350,16 +375,10 @@ CheckAttributeNames(TupleDesc tupdesc, bool relhasoids)
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*/
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for (i = 0; i < natts; i++)
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{
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for (j = 0; j < (int) lengthof(SysAtt); j++)
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{
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if (relhasoids || SysAtt[j]->attnum != ObjectIdAttributeNumber)
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{
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if (strcmp(NameStr(SysAtt[j]->attname),
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NameStr(tupdesc->attrs[i]->attname)) == 0)
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elog(ERROR, "name of column \"%s\" conflicts with an existing system column",
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NameStr(SysAtt[j]->attname));
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}
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}
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if (SystemAttributeByName(NameStr(tupdesc->attrs[i]->attname),
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relhasoids) != NULL)
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elog(ERROR, "name of column \"%s\" conflicts with an existing system column",
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NameStr(tupdesc->attrs[i]->attname));
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if (tupdesc->attrs[i]->atttypid == UNKNOWNOID)
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elog(NOTICE, "Attribute '%s' has an unknown type"
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"\n\tProceeding with relation creation anyway",
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/parse_relation.c,v 1.56 2001/08/10 18:57:37 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/parse_relation.c,v 1.57 2001/10/22 22:47:57 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -18,6 +18,7 @@
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#include "access/heapam.h"
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#include "access/htup.h"
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#include "catalog/heap.h"
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#include "catalog/pg_type.h"
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#include "nodes/makefuncs.h"
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#include "parser/parsetree.h"
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@ -43,43 +44,6 @@ static int specialAttNum(char *a);
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static void warnAutoRange(ParseState *pstate, char *refname);
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/*
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* Information defining the "system" attributes of every relation.
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*/
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static struct
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{
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char *attrname; /* name of system attribute */
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int attrnum; /* its attribute number (always < 0) */
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Oid attrtype; /* its type id */
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} special_attr[] =
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{
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{
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"ctid", SelfItemPointerAttributeNumber, TIDOID
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},
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{
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"oid", ObjectIdAttributeNumber, OIDOID
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},
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{
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"xmin", MinTransactionIdAttributeNumber, XIDOID
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},
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{
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"cmin", MinCommandIdAttributeNumber, CIDOID
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},
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{
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"xmax", MaxTransactionIdAttributeNumber, XIDOID
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},
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{
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"cmax", MaxCommandIdAttributeNumber, CIDOID
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},
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{
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"tableoid", TableOidAttributeNumber, OIDOID
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}
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};
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#define SPECIALS ((int) lengthof(special_attr))
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/*
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* refnameRangeOrJoinEntry
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* Given a refname, look to see if it matches any RTE or join table.
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@ -1001,39 +965,31 @@ attnameAttNum(Relation rd, char *a)
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static int
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specialAttNum(char *a)
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{
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int i;
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for (i = 0; i < SPECIALS; i++)
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if (strcmp(special_attr[i].attrname, a) == 0)
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return special_attr[i].attrnum;
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Form_pg_attribute sysatt;
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sysatt = SystemAttributeByName(a, true /* "oid" will be accepted */);
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if (sysatt != NULL)
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return sysatt->attnum;
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return InvalidAttrNumber;
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}
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/* given attribute id, return type of that attribute */
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/*
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* given attribute id, return type of that attribute
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*
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* This should only be used if the relation is already
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* heap_open()'ed. Use the cache version get_atttype()
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* for access to non-opened relations.
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*
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* Note: we don't bother to check rd->rd_rel->relhasoids; we assume that
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* the caller will only ask about OID if that column has been found valid.
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*/
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Oid
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attnumTypeId(Relation rd, int attid)
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{
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if (attid < 0)
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if (attid <= 0)
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{
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int i;
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Form_pg_attribute sysatt;
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for (i = 0; i < SPECIALS; i++)
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{
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if (special_attr[i].attrnum == attid)
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return special_attr[i].attrtype;
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}
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/* negative but not a valid system attr? */
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elog(ERROR, "attnumTypeId: bogus attribute number %d", attid);
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sysatt = SystemAttributeDefinition(attid, rd->rd_rel->relhasoids);
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return sysatt->atttypid;
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}
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/*
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@ -1,13 +1,13 @@
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/*-------------------------------------------------------------------------
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*
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* heap.h
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* prototypes for functions in lib/catalog/heap.c
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* prototypes for functions in backend/catalog/heap.c
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*
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*
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* Portions Copyright (c) 1996-2001, 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: heap.h,v 1.37 2001/08/10 18:57:39 tgl Exp $
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* $Id: heap.h,v 1.38 2001/10/22 22:47:57 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -47,8 +47,10 @@ extern void AddRelationRawConstraints(Relation rel,
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extern int RemoveCheckConstraint(Relation rel, const char *constrName, bool inh);
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extern Form_pg_attribute SystemAttributeDefinition(AttrNumber attno,
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bool relhasoids);
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extern Form_pg_attribute SystemAttributeByName(const char *attname,
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bool relhasoids);
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#endif /* HEAP_H */
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