From 7015dfef4babdc2cce655baf24c1b2b741864a60 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Thu, 22 Jan 1998 23:05:18 +0000
Subject: [PATCH] Add LOCK command as DELETE FROM ... WHERE false.

---
 src/backend/parser/gram.y     | 28 +++++++++++++++++++++++++---
 src/backend/parser/keywords.c |  3 ++-
 src/bin/psql/psqlHelp.h       |  5 ++++-
 src/man/declare.l             |  4 ++--
 4 files changed, 33 insertions(+), 7 deletions(-)

diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index e259fbeca8..fae67cb8ba 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.95 1998/01/20 05:04:07 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 1.96 1998/01/22 23:04:52 momjian Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -116,7 +116,7 @@ Oid	param_type(int t); /* used in parse_expr.c */
 		CopyStmt, CreateStmt, CreateAsStmt, CreateSeqStmt, DefineStmt, DestroyStmt,
 		ExtendStmt, FetchStmt,	GrantStmt, CreateTrigStmt, DropTrigStmt,
 		CreatePLangStmt, DropPLangStmt,
-		IndexStmt, ListenStmt, OptimizableStmt,
+		IndexStmt, ListenStmt, LockStmt, OptimizableStmt,
 		ProcedureStmt, 	RecipeStmt, RemoveAggrStmt, RemoveOperStmt,
 		RemoveFuncStmt, RemoveStmt,
 		RenameStmt, RevokeStmt, RuleStmt, TransactionStmt, ViewStmt, LoadStmt,
@@ -276,7 +276,7 @@ Oid	param_type(int t); /* used in parse_expr.c */
 		DATABASE, DELIMITERS, DO, EXPLAIN, EXTEND,
 		FORWARD, FUNCTION, HANDLER,
 		INDEX, INHERITS, INSTEAD, ISNULL,
-		LANCOMPILER, LISTEN, LOAD, LOCATION, MERGE, MOVE,
+		LANCOMPILER, LISTEN, LOAD, LOCK_P, LOCATION, MERGE, MOVE,
 		NEW, NONE, NOTHING, NOTNULL, OIDS, OPERATOR, PROCEDURAL,
 		RECIPE, RENAME, REPLACE, RESET, RETURNS, RULE,
 		SEQUENCE, SETOF, SHOW, STDIN, STDOUT, TRUSTED, 
@@ -364,6 +364,7 @@ stmt :	  AddAttrStmt
 		| GrantStmt
 		| IndexStmt
 		| ListenStmt
+		| LockStmt
 		| ProcedureStmt
 		| RecipeStmt
 		| RemoveAggrStmt
@@ -2210,6 +2211,27 @@ DeleteStmt:  DELETE FROM relation_name
 				}
 		;
 
+/*
+ *	Total hack to just lock a table inside a transaction.
+ *	Is it worth making this a separate command, with
+ *	its own node type and file.  I don't think so. bjm 1998/1/22
+ */
+LockStmt:  LOCK_P relation_name
+				{
+					DeleteStmt *n = makeNode(DeleteStmt);
+					A_Const *c = makeNode(A_Const);
+
+					c->val.type = T_String;
+					c->val.val.str = "f";
+					c->typename = makeNode(TypeName);
+					c->typename->name = xlateSqlType("bool");
+
+					n->relname = $2;
+					n->whereClause = c;
+					$$ = (Node *)n;
+				}
+		;
+
 
 /*****************************************************************************
  *
diff --git a/src/backend/parser/keywords.c b/src/backend/parser/keywords.c
index 904d71a43f..71ca0817dd 100644
--- a/src/backend/parser/keywords.c
+++ b/src/backend/parser/keywords.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.31 1998/01/20 05:04:09 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/keywords.c,v 1.32 1998/01/22 23:04:54 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -127,6 +127,7 @@ static ScanKeyword ScanKeywords[] = {
 	{"load", LOAD},
 	{"local", LOCAL},
 	{"location", LOCATION},
+	{"lock", LOCK_P},
 	{"match", MATCH},
 	{"merge", MERGE},
 	{"minute", MINUTE_P},
diff --git a/src/bin/psql/psqlHelp.h b/src/bin/psql/psqlHelp.h
index 3feb800bfa..d273929c4a 100644
--- a/src/bin/psql/psqlHelp.h
+++ b/src/bin/psql/psqlHelp.h
@@ -5,7 +5,7 @@
  *
  * Copyright (c) 1994, Regents of the University of California
  *
- * $Id: psqlHelp.h,v 1.38 1998/01/11 20:02:15 momjian Exp $
+ * $Id: psqlHelp.h,v 1.39 1998/01/22 23:05:09 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -250,6 +250,9 @@ static struct _helpStruct QL_HELP[] = {
 	{"load",
 		"dynamically load a module",
 	"load <filename>;"},
+	{"lock",
+		"exclusive lock a table inside a transaction",
+	"lock <class_name>;"},
 	{"move",
 		"move an cursor position",
 	"move [forward|backward] [<number>|all] [in <cursorname>];"},
diff --git a/src/man/declare.l b/src/man/declare.l
index c906f77217..37a3e11a25 100644
--- a/src/man/declare.l
+++ b/src/man/declare.l
@@ -1,9 +1,9 @@
 .\" This is -*-nroff-*-
 .\" XXX standard disclaimer belongs here....
-.\" $Header: /cvsroot/pgsql/src/man/Attic/declare.l,v 1.2 1998/01/11 22:17:24 momjian Exp $
+.\" $Header: /cvsroot/pgsql/src/man/Attic/declare.l,v 1.3 1998/01/22 23:05:18 momjian Exp $
 .TH FETCH SQL 01/23/93 PostgreSQL PostgreSQL
 .SH NAME
-declere - declare a cursor
+declare - declare a cursor
 .SH SYNOPSIS
 .nf
 \fBdeclare\fR [ \fBbinary\fR ] \fBcursor for\fR select statement