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Add TRUNCATE command, with psql help and sgml additions.
This commit is contained in:
Bruce Momjian
parent
abd4bf1341
commit
e7cad7b0cb
133
doc/src/sgml/ref/truncate.sgml
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133
doc/src/sgml/ref/truncate.sgml
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@ -0,0 +1,133 @@
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<!--
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$Header: /cvsroot/pgsql/doc/src/sgml/ref/truncate.sgml,v 1.1 1999/09/23 17:02:28 momjian Exp $
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Postgres documentation
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-->
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<refentry id="SQL-TRUNCATE">
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<refmeta>
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<refentrytitle id="SQL-TRUNCATE-TITLE">
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TRUNCATE
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</refentrytitle>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>
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TRUNCATE
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</refname>
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<refpurpose>
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Close a cursor
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</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<refsynopsisdivinfo>
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<date>1999-07-20</date>
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</refsynopsisdivinfo>
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<synopsis>
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TRUNCATE TABLE <replaceable class="PARAMETER">table</replaceable>
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</synopsis>
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<refsect2 id="R2-SQL-TRUNCATE-1">
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<refsect2info>
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<date>1998-09-08</date>
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</refsect2info>
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<title>
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Inputs
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</title>
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<para>
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<variablelist>
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<varlistentry>
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<term><replaceable class="PARAMETER">table</replaceable></term>
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<listitem>
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<para>
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The table name to truncate.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect2>
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<refsect2 id="R2-SQL-TRUNCATE-2">
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<refsect2info>
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<date>1998-09-08</date>
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</refsect2info>
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<title>
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Outputs
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</title>
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<para>
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<variablelist>
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<varlistentry>
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<term><computeroutput>
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TRUNCATE
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</computeroutput></term>
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<listitem>
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<para>
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Message returned if the table is successfully truncated.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect2>
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</refsynopsisdiv>
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<refsect1 id="R1-SQL-TRUNCATE-1">
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<refsect1info>
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<date>1998-09-08</date>
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</refsect1info>
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<title>
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Description
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</title>
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<para>
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<command>TRUNCATE</command> quickly removes all rows from a table.
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</para>
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<refsect1 id="R1-SQL-TRUNCATE-2">
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<title>
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Usage
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</title>
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<para>
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Truncate the table bigtable.
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</para>
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<programlisting>
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TRUNCATE TABLE bigtable;
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</programlisting>
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</refsect1>
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<refsect1 id="R1-SQL-TRUNCATE-3">
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<title>
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Compatibility
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</title>
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<refsect2 id="R2-SQL-TRUNCATE-4">
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<refsect2info>
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<date>1998-09-08</date>
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</refsect2info>
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<title>
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SQL92
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</title>
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<para>
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There is no <command>TRUNCATE</command> in <acronym>SQL92</acronym>.
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</para>
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</refsect2>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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sgml-parent-document:nil
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sgml-default-dtd-file:"../reference.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:"/usr/lib/sgml/catalog"
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sgml-local-ecat-files:nil
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End:
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-->
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@ -7,7 +7,7 @@
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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 1.96 1999/09/18 19:06:33 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/catalog/heap.c,v 1.97 1999/09/23 17:02:34 momjian Exp $
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*
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*
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* INTERFACE ROUTINES
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@ -30,6 +30,7 @@
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#include "miscadmin.h"
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#include "access/heapam.h"
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#include "access/genam.h"
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#include "access/xact.h"
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#include "catalog/catalog.h"
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#include "catalog/catname.h"
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@ -40,6 +41,7 @@
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#include "catalog/pg_index.h"
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#include "catalog/pg_inherits.h"
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#include "catalog/pg_ipl.h"
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#include "catalog/pg_proc.h"
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#include "catalog/pg_relcheck.h"
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#include "commands/trigger.h"
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#include "optimizer/tlist.h"
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@ -49,6 +51,7 @@
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#include "storage/smgr.h"
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#include "tcop/tcopprot.h"
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#include "utils/builtins.h"
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#include "utils/portal.h"
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#include "utils/relcache.h"
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#include "utils/syscache.h"
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#include "utils/temprel.h"
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@ -1056,6 +1059,233 @@ DeleteRelationTuple(Relation rel)
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heap_close(pg_class_desc, RowExclusiveLock);
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}
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/* --------------------------------
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* RelationTruncateIndexes - This routine is used to truncate all
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* indices associated with the heap relation to zero tuples.
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* The routine will truncate and then reconstruct the indices on
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* the relation specified by the heapRelation parameter.
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* --------------------------------
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*/
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static void
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RelationTruncateIndexes(Relation heapRelation) {
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Relation indexRelation, currentIndex;
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ScanKeyData entry;
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HeapScanDesc scan;
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HeapTuple indexTuple, procTuple, classTuple;
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Form_pg_index index;
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Oid heapId, indexId, procId, accessMethodId;
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Node *oldPred = NULL;
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PredInfo *predInfo;
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List *cnfPred = NULL;
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AttrNumber *attributeNumberA;
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FuncIndexInfo fInfo, *funcInfo = NULL;
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int i, numberOfAttributes;
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char *predString;
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/*** Save the id of the heap relation ***/
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heapId = RelationGetRelid(heapRelation);
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/*** Open the System relation, pg_index ***/
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indexRelation = heap_openr(IndexRelationName);
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/*** Scan pg_index For indexes related to heap relation ***/
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ScanKeyEntryInitialize(&entry, 0x0, Anum_pg_index_indrelid, F_OIDEQ,
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ObjectIdGetDatum(heapId));
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scan = heap_beginscan(indexRelation, false, SnapshotNow, 1, &entry);
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while (HeapTupleIsValid(indexTuple = heap_getnext(scan, 0))) {
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/*** For each index, fetch index attributes ***/
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index = (Form_pg_index) GETSTRUCT(indexTuple);
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indexId = index->indexrelid;
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procId = index->indproc;
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for (i = 0; i < INDEX_MAX_KEYS; i++) {
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if (index->indkey[i] == InvalidAttrNumber) break;
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}
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numberOfAttributes = i;
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/*** If a valid where predicate, compute predicate Node ***/
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if (VARSIZE(&index->indpred) != 0) {
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predString = fmgr(F_TEXTOUT, &index->indpred);
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oldPred = stringToNode(predString);
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pfree(predString);
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}
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predInfo = (PredInfo *) palloc(sizeof(PredInfo));
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predInfo->pred = (Node *) cnfPred;
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/* predInfo->pred = (Node *) oldPred; */
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predInfo->oldPred = oldPred;
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/*** Assign Index keys to attributes array ***/
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attributeNumberA = (AttrNumber *) palloc(numberOfAttributes *
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sizeof(attributeNumberA[0]));
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for (i = 0; i < numberOfAttributes; i++) {
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attributeNumberA[i] = index->indkey[i];
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}
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/*** If this is a procedural index, initialize our FuncIndexInfo ***/
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if (procId != InvalidOid) {
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funcInfo = &fInfo;
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FIsetnArgs(funcInfo, numberOfAttributes);
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procTuple = SearchSysCacheTuple(PROOID, ObjectIdGetDatum(procId),
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0, 0, 0);
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if (!HeapTupleIsValid(procTuple)) {
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elog(ERROR, "RelationTruncateIndexes: index procedure not found");
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}
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namecpy(&(funcInfo->funcName),
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&(((Form_pg_proc) GETSTRUCT(procTuple))->proname));
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FIsetProcOid(funcInfo, procTuple->t_data->t_oid);
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}
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/*** Fetch the classTuple associated with this index ***/
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classTuple = SearchSysCacheTupleCopy(RELOID, ObjectIdGetDatum(indexId),
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0, 0, 0);
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if (!HeapTupleIsValid(classTuple)) {
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elog(ERROR, "RelationTruncateIndexes: index access method not found");
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}
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accessMethodId = ((Form_pg_class) GETSTRUCT(classTuple))->relam;
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/*** Open our index relation ***/
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currentIndex = index_open(indexId);
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if (currentIndex == NULL) {
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elog(ERROR, "RelationTruncateIndexes: can't open index relation");
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}
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/*** Truncate the index before building ***/
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smgrtruncate(DEFAULT_SMGR, currentIndex, 0);
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currentIndex->rd_nblocks = 0;
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/*** Initialize the index and rebuild ***/
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InitIndexStrategy(numberOfAttributes, currentIndex, accessMethodId);
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index_build(heapRelation, currentIndex, numberOfAttributes,
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attributeNumberA, 0, NULL, funcInfo, predInfo);
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/*** Re-open our heap relation and re-lock, since index_build ***/
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/*** will close and unlock the relation ***/
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heapRelation = heap_open(heapId);
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LockRelation(heapRelation, AccessExclusiveLock);
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/*** RelationUnsetLockForWrite(currentIndex); ***/
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}
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/*** Complete the scan and close the Catalogueindex Relation ***/
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heap_endscan(scan);
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heap_close(indexRelation);
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}
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/* ----------------------------
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* heap_truncate
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*
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* This routine is used to truncate the data from the
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* storange manager of any data within the relation handed
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* to this routine. The routine assumes that the relation
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* handed to this routine is an open relation.
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*
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* ----------------------------
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*/
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void
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heap_truncate(char *relname) {
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Relation rel;
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Oid rid;
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Portal portal;
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char *pname;
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MemoryContext old;
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PortalVariableMemory pmem;
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NameData truncRel;
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/*
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* Create a portal for safe memory across transctions. We need to
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* palloc the name space for it because our hash function expects the
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* name to be on a longword boundary. CreatePortal copies the name to
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* safe storage for us.
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*/
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pname = (char *) palloc(strlen(TRUNCPNAME) + 1);
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strcpy(pname, TRUNCPNAME);
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portal = CreatePortal(pname);
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pfree(pname);
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/* relname gets de-allocated on transaction commit */
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strcpy(truncRel.data, relname);
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pmem = PortalGetVariableMemory(portal);
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old = MemoryContextSwitchTo((MemoryContext) pmem);
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MemoryContextSwitchTo(old);
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/* Commit the current transaction */
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CommitTransactionCommand();
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StartTransactionCommand();
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/* Open relation for processing */
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rel = heap_openr(truncRel.data);
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if (rel == NULL)
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elog(ERROR, "Relation %s Does Not Exist!", truncRel.data);
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rid = rel->rd_id;
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LockRelation(rel, AccessExclusiveLock);
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/* Release any buffers associated with this relation */
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ReleaseRelationBuffers(rel);
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BlowawayRelationBuffers(rel, 0);
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/* Now truncate the actual data and set blocks to zero */
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smgrtruncate(DEFAULT_SMGR, rel, 0);
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rel->rd_nblocks = 0;
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/* If this relation has indexes, truncate the indexes, which */
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/* will unlock the relation as a result. Otherwise, unlock */
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/* the relation ourselves. */
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if (rel->rd_rel->relhasindex) {
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RelationTruncateIndexes(rel);
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} else {
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UnlockRelation(rel, AccessExclusiveLock);
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}
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/* Close our relation */
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heap_close(rel);
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RelationForgetRelation(rid);
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/* Destoy cross-transaction memory */
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PortalDestroy(&portal);
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/* Start new transaction */
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CommitTransactionCommand();
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StartTransactionCommand();
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return;
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}
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/* --------------------------------
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* DeleteAttributeTuples
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*
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/commands/Attic/creatinh.c,v 1.46 1999/09/18 19:06:40 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/commands/Attic/creatinh.c,v 1.47 1999/09/23 17:02:40 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -157,6 +157,26 @@ RemoveRelation(char *name)
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heap_destroy_with_catalog(name);
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}
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/*
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* TruncateRelation --
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* Removes all the rows from a relation
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*
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* Exceptions:
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* BadArg if name is invalid
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*
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*
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* Note:
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* Rows are removed, indices are truncated and reconstructed.
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*/
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void
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TruncateRelation(char *name)
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{
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AssertArg(name);
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heap_truncate(name);
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}
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/*
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* MergeAttributes
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@ -10,7 +10,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.98 1999/09/14 06:06:31 thomas Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.99 1999/09/23 17:02:46 momjian Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -122,6 +122,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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%type <node> stmt,
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AddAttrStmt, ClosePortalStmt,
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CopyStmt, CreateStmt, CreateAsStmt, CreateSeqStmt, DefineStmt, DestroyStmt,
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TruncateStmt,
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ExtendStmt, FetchStmt, GrantStmt, CreateTrigStmt, DropTrigStmt,
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CreatePLangStmt, DropPLangStmt,
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IndexStmt, ListenStmt, UnlistenStmt, LockStmt, OptimizableStmt,
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@ -318,7 +319,7 @@ Oid param_type(int t); /* used in parse_expr.c */
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OFFSET, OIDS, OPERATOR, PASSWORD, PROCEDURAL,
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RENAME, RESET, RETURNS, ROW, RULE,
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SEQUENCE, SERIAL, SETOF, SHARE, SHOW, START, STATEMENT, STDIN, STDOUT,
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TRUSTED,
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TRUNCATE, TRUSTED,
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UNLISTEN, UNTIL, VACUUM, VALID, VERBOSE, VERSION
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/* Special keywords, not in the query language - see the "lex" file */
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@ -383,7 +384,8 @@ stmt : AddAttrStmt
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| CreateUserStmt
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| ClusterStmt
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| DefineStmt
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| DestroyStmt
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| DestroyStmt
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| TruncateStmt
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| DropPLangStmt
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| DropTrigStmt
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| DropUserStmt
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@ -1607,6 +1609,20 @@ DestroyStmt: DROP TABLE relation_name_list
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}
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;
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/*****************************************************************************
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*
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* QUERY:
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* truncate table relname
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*
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*****************************************************************************/
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TruncateStmt: TRUNCATE TABLE relation_name
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{
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TruncateStmt *n = makeNode(TruncateStmt);
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n->relName = $3;
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$$ = (Node *)n;
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}
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;
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/*****************************************************************************
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*
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@ -2371,7 +2387,6 @@ ClusterStmt: CLUSTER index_name ON relation_name
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}
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;
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/*****************************************************************************
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*
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* QUERY:
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||||
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@ -7,7 +7,7 @@
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*
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||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.60 1999/07/17 20:17:22 momjian Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.61 1999/09/23 17:02:46 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -225,6 +225,7 @@ static ScanKeyword ScanKeywords[] = {
|
||||
{"trigger", TRIGGER},
|
||||
{"trim", TRIM},
|
||||
{"true", TRUE_P},
|
||||
{"truncate", TRUNCATE},
|
||||
{"trusted", TRUSTED},
|
||||
{"type", TYPE_P},
|
||||
{"union", UNION},
|
||||
|
||||
@ -9,7 +9,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.65 1999/09/18 19:07:44 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.66 1999/09/23 17:02:52 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -206,6 +206,38 @@ ProcessUtility(Node *parsetree,
|
||||
}
|
||||
break;
|
||||
|
||||
case T_TruncateStmt:
|
||||
{
|
||||
|
||||
Relation rel;
|
||||
|
||||
PS_SET_STATUS(commandTag = "TRUNCATE");
|
||||
CHECK_IF_ABORTED();
|
||||
|
||||
relname = ((TruncateStmt *) parsetree)->relName;
|
||||
if (!allowSystemTableMods && IsSystemRelationName(relname)) {
|
||||
elog(ERROR, "TRUNCATE cannot be used on system tables. '%s' is a system table",
|
||||
relname);
|
||||
}
|
||||
|
||||
rel = heap_openr(relname);
|
||||
if (RelationIsValid(rel)) {
|
||||
if (rel->rd_rel->relkind == RELKIND_SEQUENCE) {
|
||||
elog(ERROR, "TRUNCATE cannot be used on sequences. '%s' is a sequence",
|
||||
relname);
|
||||
}
|
||||
heap_close(rel);
|
||||
}
|
||||
#ifndef NO_SECURITY
|
||||
if (!pg_ownercheck(userName, relname, RELNAME)) {
|
||||
elog(ERROR, "you do not own class \"%s\"", relname);
|
||||
}
|
||||
#endif
|
||||
TruncateRelation(((TruncateStmt *) parsetree)->relName);
|
||||
|
||||
}
|
||||
break;
|
||||
|
||||
case T_CopyStmt:
|
||||
{
|
||||
CopyStmt *stmt = (CopyStmt *) parsetree;
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/utils/mmgr/portalmem.c,v 1.29 1999/09/09 16:25:29 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/utils/mmgr/portalmem.c,v 1.30 1999/09/23 17:02:58 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -410,6 +410,8 @@ PortalNameIsSpecial(char *pname)
|
||||
{
|
||||
if (strcmp(pname, VACPNAME) == 0)
|
||||
return true;
|
||||
if (strcmp(pname, TRUNCPNAME) == 0)
|
||||
return true;
|
||||
return false;
|
||||
}
|
||||
|
||||
|
||||
@ -5,7 +5,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: psqlHelp.h,v 1.72 1999/07/11 22:47:21 ishii Exp $
|
||||
* $Id: psqlHelp.h,v 1.73 1999/09/23 17:03:04 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -23,11 +23,11 @@ static struct _helpStruct QL_HELP[] = {
|
||||
"\
|
||||
\tabort [transaction|work];"},
|
||||
{"alter table",
|
||||
"add/rename attributes, rename tables",
|
||||
"add/rename columns, rename tables",
|
||||
"\
|
||||
\tALTER TABLE class_name [*] ADD COLUMN attr type\n\
|
||||
\tALTER TABLE class_name [*] RENAME [COLUMN] attr1 TO attr2\n\
|
||||
\tALTER TABLE class_name1 RENAME TO class_name2"},
|
||||
\tALTER TABLE tablename [*] ADD COLUMN colname type\n\
|
||||
\tALTER TABLE tablename [*] RENAME [COLUMN] colname1 TO colname2\n\
|
||||
\tALTER TABLE tablename1 RENAME TO tablename2"},
|
||||
{"alter user",
|
||||
"alter system information for a user",
|
||||
"\
|
||||
@ -56,7 +56,7 @@ static struct _helpStruct QL_HELP[] = {
|
||||
{"copy",
|
||||
"copy data to and from a table",
|
||||
"\
|
||||
\tCOPY [BINARY] class_name [WITH OIDS]\n\
|
||||
\tCOPY [BINARY] tablename [WITH OIDS]\n\
|
||||
\tTO|FROM filename|STDIN|STDOUT [USING DELIMITERS 'delim'];"},
|
||||
{"create",
|
||||
"Please be more specific:",
|
||||
@ -93,8 +93,8 @@ static struct _helpStruct QL_HELP[] = {
|
||||
{"create index",
|
||||
"construct an index",
|
||||
"\
|
||||
\tCREATE [UNIQUE] INDEX indexname ON class_name [USING access_method]\n\
|
||||
( attr1 [type_class1], ...attrN | funcname(attr1, ...) [type_class] );"},
|
||||
\tCREATE [UNIQUE] INDEX indexname ON tablename [USING access_method]\n\
|
||||
( colname1 [type_class1], ...colnameN | funcname(colname1, ...) [type_class] );"},
|
||||
{"create operator",
|
||||
"create a user-defined operator",
|
||||
"\
|
||||
@ -124,16 +124,16 @@ static struct _helpStruct QL_HELP[] = {
|
||||
{"create table",
|
||||
"create a new table",
|
||||
"\
|
||||
\tCREATE [TEMP] TABLE class_name\n\
|
||||
\t(attr1 type1 [DEFAULT expression] [NOT NULL], ...attrN\n\
|
||||
\tCREATE [TEMP] TABLE tablename\n\
|
||||
\t(colname1 type1 [DEFAULT expression] [NOT NULL], ...colnameN\n\
|
||||
\t[[CONSTRAINT name] CHECK condition1, ...conditionN] )\n\
|
||||
\t[INHERITS (class_name1, ...class_nameN)\n\
|
||||
\t[INHERITS (tablename1, ...tablenameN)\n\
|
||||
;"},
|
||||
{"create trigger",
|
||||
"create a new trigger",
|
||||
"\
|
||||
\tCREATE TRIGGER trigger_name AFTER|BEFORE event1 [OR event2 [OR event3] ]\n\
|
||||
\tON class_name FOR EACH ROW|STATEMENT\n\
|
||||
\tON tablename FOR EACH ROW|STATEMENT\n\
|
||||
\tEXECUTE PROCEDURE func_name ([arguments])\n\
|
||||
\n\
|
||||
\teventX is one of INSERT, DELETE, UPDATE"},
|
||||
@ -159,8 +159,8 @@ static struct _helpStruct QL_HELP[] = {
|
||||
"create a view",
|
||||
"\
|
||||
\tCREATE VIEW view_name AS\n\
|
||||
\tSELECT [DISTINCT [ON attrN]]\n\
|
||||
\texpr1 [AS attr1], ...exprN\n\
|
||||
\tSELECT [DISTINCT [ON colnameN]]\n\
|
||||
\texpr1 [AS colname1], ...exprN\n\
|
||||
\t[FROM from_list]\n\
|
||||
\t[WHERE qual]\n\
|
||||
\t[GROUP BY group_list];"},
|
||||
@ -168,18 +168,18 @@ static struct _helpStruct QL_HELP[] = {
|
||||
"set up a cursor",
|
||||
"\
|
||||
\tDECLARE cursorname [BINARY] CURSOR FOR\n\
|
||||
\tSELECT [DISTINCT [ON attrN]]\n\
|
||||
\texpr1 [AS attr1], ...exprN\n\
|
||||
\tSELECT [DISTINCT [ON colnameN]]\n\
|
||||
\texpr1 [AS colname1], ...exprN\n\
|
||||
\t[FROM from_list]\n\
|
||||
\t[WHERE qual]\n\
|
||||
\t[GROUP BY group_list]\n\
|
||||
\t[HAVING having_clause]\n\
|
||||
\t[ORDER BY attr1 [USING op1], ...attrN]\n\
|
||||
\t[ORDER BY colname1 [USING op1], ...colnameN]\n\
|
||||
\t[ { UNION [ALL] | INTERSECT | EXCEPT } SELECT ...];"},
|
||||
{"delete",
|
||||
"delete tuples",
|
||||
"\
|
||||
\tDELETE FROM class_name [WHERE qual];"},
|
||||
\tDELETE FROM tablename [WHERE qual];"},
|
||||
{"drop",
|
||||
"Please be more specific:",
|
||||
"\
|
||||
@ -225,11 +225,11 @@ static struct _helpStruct QL_HELP[] = {
|
||||
{"drop table",
|
||||
"remove a table",
|
||||
"\
|
||||
\tDROP TABLE class_name1, ...class_nameN;"},
|
||||
\tDROP TABLE tablename1, ...tablenameN;"},
|
||||
{"drop trigger",
|
||||
"remove a trigger",
|
||||
"\
|
||||
\tDROP TRIGGER trigger_name ON class_name;"},
|
||||
\tDROP TRIGGER trigger_name ON tablename;"},
|
||||
{"drop type",
|
||||
"remove a user-defined base type",
|
||||
"\
|
||||
@ -263,9 +263,9 @@ static struct _helpStruct QL_HELP[] = {
|
||||
{"insert",
|
||||
"insert tuples",
|
||||
"\
|
||||
\tINSERT INTO class_name [(attr1, ...attrN)]\n\
|
||||
\tINSERT INTO tablename [(colname1, ...colnameN)]\n\
|
||||
\tVALUES (expr1,..exprN) |\n\
|
||||
\tSELECT [DISTINCT [ON attrN]]\n\
|
||||
\tSELECT [DISTINCT [ON colnameN]]\n\
|
||||
\texpr1, ...exprN\n\
|
||||
\t[FROM from_clause]\n\
|
||||
\t[WHERE qual]\n\
|
||||
@ -283,7 +283,7 @@ static struct _helpStruct QL_HELP[] = {
|
||||
{"lock",
|
||||
"exclusive lock a table inside a transaction",
|
||||
"\
|
||||
\tLOCK [TABLE] class_name \n\
|
||||
\tLOCK [TABLE] tablename \n\
|
||||
\t[IN [ROW|ACCESS] [SHARE|EXCLUSIVE] | [SHARE ROW EXCLUSIVE] MODE];"},
|
||||
{"move",
|
||||
"move an cursor position",
|
||||
@ -311,15 +311,15 @@ TIMEZONE|XACTISOLEVEL|CLIENT_ENCODING|SERVER_ENCODING"},
|
||||
{"select",
|
||||
"retrieve tuples",
|
||||
"\
|
||||
\tSELECT [DISTINCT [ON attrN]] expr1 [AS attr1], ...exprN\n\
|
||||
\t[INTO [TEMP] [TABLE] class_name]\n\
|
||||
\tSELECT [DISTINCT [ON colnameN]] expr1 [AS colname1], ...exprN\n\
|
||||
\t[INTO [TEMP] [TABLE] tablename]\n\
|
||||
\t[FROM from_list]\n\
|
||||
\t[WHERE qual]\n\
|
||||
\t[GROUP BY group_list]\n\
|
||||
\t[HAVING having_clause]\n\
|
||||
\t[ { UNION [ALL] | INTERSECT | EXCEPT } SELECT ...]\n\
|
||||
\t[ORDER BY attr1 [ASC|DESC] [USING op1], ...attrN ]\n\
|
||||
\t[FOR UPDATE [OF class_name...]]\n\
|
||||
\t[ORDER BY colname1 [ASC|DESC] [USING op1], ...colnameN ]\n\
|
||||
\t[FOR UPDATE [OF tablename...]]\n\
|
||||
\t[LIMIT count [OFFSET|, count]];"},
|
||||
{"set",
|
||||
"set run-time environment",
|
||||
@ -346,10 +346,14 @@ TIMEZONE|XACTISOLEVEL|CLIENT_ENCODING|SERVER_ENCODING"},
|
||||
"stop listening for notification on a condition name",
|
||||
"\
|
||||
\tUNLISTEN name|\"non-name string\"|\"*\""},
|
||||
{"truncate",
|
||||
"quickly removes all rows from a table",
|
||||
"\
|
||||
\tTRUNCATE TABLE tablename"},
|
||||
{"update",
|
||||
"update tuples",
|
||||
"\
|
||||
\tUPDATE class_name SET attr1 = expr1, ...attrN = exprN\n\
|
||||
\tUPDATE tablename SET colname1 = expr1, ...colnameN = exprN\n\
|
||||
\t[FROM from_clause]\n\
|
||||
\t[WHERE qual];"},
|
||||
{"vacuum",
|
||||
@ -357,7 +361,7 @@ TIMEZONE|XACTISOLEVEL|CLIENT_ENCODING|SERVER_ENCODING"},
|
||||
"\
|
||||
\tVACUUM [VERBOSE] [ANALYZE] [table]\n\
|
||||
\tor\n\
|
||||
\tVACUUM [VERBOSE] ANALYZE [table [(attr1, ...attrN)]];"},
|
||||
\tVACUUM [VERBOSE] ANALYZE [table [(colname1, ...colnameN)]];"},
|
||||
{NULL, NULL, NULL} /* important to keep a NULL terminator
|
||||
* here! */
|
||||
};
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: heap.h,v 1.20 1999/07/15 23:03:41 momjian Exp $
|
||||
* $Id: heap.h,v 1.21 1999/09/23 17:03:10 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -23,6 +23,7 @@ extern Oid heap_create_with_catalog(char *relname,
|
||||
TupleDesc tupdesc, char relkind, bool istemp);
|
||||
|
||||
extern void heap_destroy_with_catalog(char *relname);
|
||||
extern void heap_truncate(char *relname);
|
||||
extern void heap_destroy(Relation rel);
|
||||
|
||||
extern void InitNoNameRelList(void);
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: creatinh.h,v 1.9 1999/02/13 23:21:18 momjian Exp $
|
||||
* $Id: creatinh.h,v 1.10 1999/09/23 17:03:16 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -17,5 +17,6 @@
|
||||
|
||||
extern void DefineRelation(CreateStmt *stmt, char relkind);
|
||||
extern void RemoveRelation(char *name);
|
||||
extern void TruncateRelation(char *name);
|
||||
|
||||
#endif /* CREATINH_H */
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: nodes.h,v 1.51 1999/08/16 02:17:39 tgl Exp $
|
||||
* $Id: nodes.h,v 1.52 1999/09/23 17:03:21 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -151,6 +151,7 @@ typedef enum NodeTag
|
||||
T_VersionStmt,
|
||||
T_DefineStmt,
|
||||
T_DestroyStmt,
|
||||
T_TruncateStmt,
|
||||
T_ExtendStmt,
|
||||
T_FetchStmt,
|
||||
T_IndexStmt,
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: parsenodes.h,v 1.78 1999/08/21 03:49:09 tgl Exp $
|
||||
* $Id: parsenodes.h,v 1.79 1999/09/23 17:03:22 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -282,6 +282,16 @@ typedef struct DestroyStmt
|
||||
bool sequence;
|
||||
} DestroyStmt;
|
||||
|
||||
/* ----------------------
|
||||
* Truncate Table Statement
|
||||
* ----------------------
|
||||
*/
|
||||
typedef struct TruncateStmt
|
||||
{
|
||||
NodeTag type;
|
||||
char *relName; /* relation to be truncated */
|
||||
} TruncateStmt;
|
||||
|
||||
/* ----------------------
|
||||
* Extend Index Statement
|
||||
* ----------------------
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: bufmgr.h,v 1.29 1999/07/17 20:18:33 momjian Exp $
|
||||
* $Id: bufmgr.h,v 1.30 1999/09/23 17:03:27 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -161,6 +161,7 @@ extern void BufferRefCountReset(int *refcountsave);
|
||||
extern void BufferRefCountRestore(int *refcountsave);
|
||||
extern int SetBufferWriteMode(int mode);
|
||||
extern void SetBufferCommitInfoNeedsSave(Buffer buffer);
|
||||
extern int BlowawayRelationBuffers(Relation rel, BlockNumber block);
|
||||
|
||||
extern void UnlockBuffers(void);
|
||||
extern void LockBuffer(Buffer buffer, int mode);
|
||||
|
||||
@ -6,7 +6,7 @@
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $Id: portal.h,v 1.18 1999/09/09 16:25:23 tgl Exp $
|
||||
* $Id: portal.h,v 1.19 1999/09/23 17:03:33 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -60,6 +60,7 @@ struct PortalD
|
||||
* Special portals (well, their names anyway)
|
||||
*/
|
||||
#define VACPNAME "<vacuum>"
|
||||
#define TRUNCPNAME "<truncate>"
|
||||
|
||||
extern bool PortalNameIsSpecial(char *pname);
|
||||
extern void AtEOXact_portals(void);
|
||||
|
||||
@ -163,6 +163,7 @@ do
|
||||
-TDepth \
|
||||
-TDestReceiver \
|
||||
-TDestroyStmt \
|
||||
-TTruncateStmt \
|
||||
-TDestroydbStmt \
|
||||
-TDisplay \
|
||||
-TDl_info \
|
||||
|
||||
Loading…
Reference in New Issue
Block a user