mirror of https://github.com/postgres/postgres
Bruce Momjian
27 years ago
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7fc75517df
commit
4390b0bfbe
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/*-------------------------------------------------------------------------
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* |
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* temprel.c-- |
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* POSTGRES temporary relation handling |
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* |
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* 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/utils/cache/Attic/temprel.c,v 1.1 1999/02/02 03:45:03 momjian Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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/*
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* This implements temp tables by modifying the relname cache lookups |
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* of pg_class. |
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* When a temp table is created, a linked list of temp table tuples is |
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* stored here. When a relname cache lookup is done, references to user-named |
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* temp tables are converted to the internal temp table names. |
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* |
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*/ |
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#include <sys/types.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include "postgres.h" |
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#include "miscadmin.h" |
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#include "nodes/pg_list.h" |
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#include "utils/mcxt.h" |
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#include "utils/temprel.h" |
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#include "access/htup.h" |
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#include "access/heapam.h" |
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#include "catalog/heap.h" |
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#include "catalog/index.h" |
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#include "catalog/pg_class.h" |
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GlobalMemory CacheCxt; |
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/* ----------------
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* global variables |
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* ---------------- |
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*/ |
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static List *temp_rels = NIL; |
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typedef struct TempTable |
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{ |
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char *user_relname; |
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HeapTuple pg_class_tuple; |
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} TempTable; |
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void |
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create_temp_relation(char *relname, HeapTuple pg_class_tuple) |
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{ |
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MemoryContext oldcxt; |
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TempTable *temp_rel; |
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oldcxt = MemoryContextSwitchTo((MemoryContext) CacheCxt); |
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temp_rel = palloc(sizeof(TempTable)); |
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temp_rel->user_relname = palloc(NAMEDATALEN); |
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/* save user-supplied name */ |
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strcpy(temp_rel->user_relname, relname); |
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temp_rel->pg_class_tuple = heap_copytuple(pg_class_tuple); |
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temp_rels = lcons(temp_rel, temp_rels); |
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MemoryContextSwitchTo(oldcxt); |
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} |
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void |
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remove_all_temp_relations(void) |
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{ |
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List *l, *next; |
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l = temp_rels; |
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while (l != NIL) |
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{ |
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TempTable *temp_rel = lfirst(l); |
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Form_pg_class classtuple; |
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classtuple = (Form_pg_class)GETSTRUCT(temp_rel->pg_class_tuple); |
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next = lnext(l); /* do this first, l is deallocated */ |
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if (classtuple->relkind != RELKIND_INDEX) |
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{ |
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char relname[NAMEDATALEN]; |
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/* safe from deallocation */ |
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strcpy(relname, temp_rel->user_relname);
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heap_destroy_with_catalog(relname); |
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} |
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else |
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index_destroy(temp_rel->pg_class_tuple->t_data->t_oid); |
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l = next; |
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} |
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} |
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/* we don't have the relname for indexes, so we just pass the oid */ |
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void |
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remove_temp_relation(Oid relid) |
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{ |
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MemoryContext oldcxt; |
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List *l, *prev; |
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oldcxt = MemoryContextSwitchTo((MemoryContext) CacheCxt); |
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prev = NIL; |
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l = temp_rels; |
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while (l != NIL) |
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{ |
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TempTable *temp_rel = lfirst(l); |
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if (temp_rel->pg_class_tuple->t_data->t_oid == relid) |
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{ |
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pfree(temp_rel->user_relname); |
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pfree(temp_rel->pg_class_tuple); |
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pfree(temp_rel); |
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/* remove from linked list */ |
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if (prev != NIL) |
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{ |
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lnext(prev) = lnext(l); |
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pfree(l); |
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l = lnext(prev); |
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} |
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else |
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{ |
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temp_rels = lnext(l); |
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pfree(l); |
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l = temp_rels; |
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} |
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} |
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else |
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{ |
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prev = l; |
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l = lnext(l); |
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} |
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} |
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MemoryContextSwitchTo(oldcxt); |
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} |
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HeapTuple |
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get_temp_rel_by_name(char *user_relname) |
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{ |
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List *l; |
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foreach(l, temp_rels) |
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{ |
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TempTable *temp_rel = lfirst(l); |
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if (strcmp(temp_rel->user_relname, user_relname) == 0) |
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return temp_rel->pg_class_tuple; |
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} |
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return NULL; |
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} |
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@ -0,0 +1,25 @@ |
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/*-------------------------------------------------------------------------
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* |
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* temprel.h-- |
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* Temporary relation functions |
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* |
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* |
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* Copyright (c) 1994, Regents of the University of California |
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* |
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* $Id: temprel.h,v 1.1 1999/02/02 03:45:28 momjian Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef TEMPREL_H |
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#define TEMPREL_H |
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#include "access/htup.h" |
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#include "access/attnum.h" |
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void create_temp_relation(char *relname, HeapTuple pg_class_tuple); |
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void remove_all_temp_relations(void); |
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void remove_temp_relation(Oid relid); |
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HeapTuple get_temp_rel_by_name(char *user_relname); |
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#endif /* TEMPREL_H */ |
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@ -1,10 +1,10 @@ |
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QUERY: SELECT * |
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INTO TABLE temp1 |
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FROM temp |
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INTO TABLE tmp1 |
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FROM tmp |
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WHERE onek.unique1 < 2; |
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QUERY: DROP TABLE temp1; |
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QUERY: DROP TABLE tmp1; |
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QUERY: SELECT * |
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INTO TABLE temp1 |
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FROM temp |
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INTO TABLE tmp1 |
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FROM tmp |
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WHERE onek2.unique1 < 2; |
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QUERY: DROP TABLE temp1; |
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QUERY: DROP TABLE tmp1; |
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@ -0,0 +1,29 @@ |
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QUERY: CREATE TABLE temptest(col int); |
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QUERY: CREATE INDEX i_temptest ON temptest(col); |
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QUERY: CREATE TEMP TABLE temptest(col int); |
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QUERY: CREATE INDEX i_temptest ON temptest(col); |
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QUERY: DROP INDEX i_temptest; |
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QUERY: DROP TABLE temptest; |
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QUERY: DROP INDEX i_temptest; |
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QUERY: DROP TABLE temptest; |
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QUERY: CREATE TABLE temptest(col int); |
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QUERY: INSERT INTO temptest VALUES (1); |
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QUERY: CREATE TEMP TABLE temptest(col int); |
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QUERY: INSERT INTO temptest VALUES (2); |
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QUERY: SELECT * FROM temptest; |
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col |
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--- |
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2 |
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(1 row) |
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QUERY: DROP TABLE temptest; |
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QUERY: SELECT * FROM temptest; |
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col |
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--- |
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1 |
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(1 row) |
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QUERY: DROP TABLE temptest; |
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QUERY: CREATE TEMP TABLE temptest(col int); |
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QUERY: SELECT * FROM temptest; |
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ERROR: temptest: Table does not exist. |
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@ -1,14 +1,14 @@ |
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SELECT * |
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INTO TABLE temp1 |
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FROM temp |
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INTO TABLE tmp1 |
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FROM tmp |
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WHERE onek.unique1 < 2; |
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DROP TABLE temp1; |
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DROP TABLE tmp1; |
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SELECT * |
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INTO TABLE temp1 |
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FROM temp |
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INTO TABLE tmp1 |
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FROM tmp |
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WHERE onek2.unique1 < 2; |
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DROP TABLE temp1; |
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DROP TABLE tmp1; |
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@ -0,0 +1,47 @@ |
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-- |
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-- Test temp relations and indexes |
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-- |
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-- test temp table/index masking |
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CREATE TABLE temptest(col int); |
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CREATE INDEX i_temptest ON temptest(col); |
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CREATE TEMP TABLE temptest(col int); |
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CREATE INDEX i_temptest ON temptest(col); |
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DROP INDEX i_temptest; |
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DROP TABLE temptest; |
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DROP INDEX i_temptest; |
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DROP TABLE temptest; |
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-- test temp table selects |
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CREATE TABLE temptest(col int); |
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INSERT INTO temptest VALUES (1); |
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CREATE TEMP TABLE temptest(col int); |
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INSERT INTO temptest VALUES (2); |
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SELECT * FROM temptest; |
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DROP TABLE temptest; |
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SELECT * FROM temptest; |
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DROP TABLE temptest; |
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CREATE TEMP TABLE temptest(col int); |
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-- test temp table deletion |
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\c regression |
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SELECT * FROM temptest; |
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