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Add NOWAIT option to SELECT FOR UPDATE/SHARE.

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Original patch by Hans-Juergen Schoenig, revisions by Karel Zak
and Tom Lane.
This commit is contained in:
Tom Lane
2005-08-01 20:31:16 +00:00
parent ca7abcd89d
commit 2a4fad1a0e
28 changed files with 387 additions and 157 deletions
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21
src/include/nodes/parsenodes.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.288 2005/08/01 04:03:58 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.289 2005/08/01 20:31:15 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -95,6 +95,7 @@ typedef struct Query
bool forUpdate; /* true if rowMarks are FOR UPDATE,
* false if they are FOR SHARE */
bool rowNoWait; /* FOR UPDATE/SHARE NOWAIT option */
List *targetList; /* target list (of TargetEntry) */
@@ -415,6 +416,20 @@ typedef struct DefElem
Node *arg; /* a (Value *) or a (TypeName *) */
} DefElem;
/*
* LockingClause - raw representation of FOR UPDATE/SHARE options
*
* Note: lockedRels == NIL means "all relations in query". Otherwise it
* is a list of String nodes giving relation eref names.
*/
typedef struct LockingClause
{
NodeTag type;
List *lockedRels; /* FOR UPDATE or FOR SHARE relations */
bool forUpdate; /* true = FOR UPDATE, false = FOR SHARE */
bool nowait; /* NOWAIT option */
} LockingClause;
/****************************************************************************
* Nodes for a Query tree
@@ -686,8 +701,7 @@ typedef struct SelectStmt
List *sortClause; /* sort clause (a list of SortBy's) */
Node *limitOffset; /* # of result tuples to skip */
Node *limitCount; /* # of result tuples to return */
List *lockedRels; /* FOR UPDATE or FOR SHARE relations */
bool forUpdate; /* true = FOR UPDATE, false = FOR SHARE */
LockingClause *lockingClause; /* FOR UPDATE/FOR SHARE */
/*
* These fields are used only in upper-level SelectStmts.
@@ -699,6 +713,7 @@ typedef struct SelectStmt
/* Eventually add fields for CORRESPONDING spec here */
} SelectStmt;
/* ----------------------
* Set Operation node for post-analysis query trees
*