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Expose more cursor-related functionality in SPI: specifically, allow

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access to the planner's cursor-related planning options, and provide new
FETCH/MOVE routines that allow access to the full power of those commands.
Small refactoring of planner(), pg_plan_query(), and pg_plan_queries()
APIs to make it convenient to pass the planning options down from SPI.

This is the core-code portion of Pavel Stehule's patch for scrollable
cursor support in plpgsql; I'll review and apply the plpgsql changes
separately.
This commit is contained in:
Tom Lane
2007-04-16 01:14:58 +00:00
parent fa92d21a48
commit 66888f7424
15 changed files with 435 additions and 71 deletions
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17
src/backend/parser/gram.y
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@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.588 2007/04/12 06:53:46 neilc Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.589 2007/04/16 01:14:56 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -279,9 +279,9 @@ static Node *makeXmlExpr(XmlExprOp op, char *name, List *named_args, List *args)
%type <boolean> opt_freeze opt_default opt_recheck
%type <defelt> opt_binary opt_oids copy_delimiter
%type <boolean> copy_from opt_hold
%type <boolean> copy_from
%type <ival> opt_column event cursor_options
%type <ival> opt_column event cursor_options opt_hold
%type <objtype> reindex_type drop_type comment_type
%type <node> fetch_direction select_limit_value select_offset_value
@@ -5821,10 +5821,9 @@ DeclareCursorStmt: DECLARE name cursor_options CURSOR opt_hold FOR SelectStmt
{
DeclareCursorStmt *n = makeNode(DeclareCursorStmt);
n->portalname = $2;
n->options = $3;
/* currently we always set FAST_PLAN option */
n->options = $3 | $5 | CURSOR_OPT_FAST_PLAN;
n->query = $7;
if ($5)
n->options |= CURSOR_OPT_HOLD;
$$ = (Node *)n;
}
;
@@ -5836,9 +5835,9 @@ cursor_options: /*EMPTY*/ { $$ = 0; }
| cursor_options INSENSITIVE { $$ = $1 | CURSOR_OPT_INSENSITIVE; }
;
opt_hold: /* EMPTY */ { $$ = FALSE; }
| WITH HOLD { $$ = TRUE; }
| WITHOUT HOLD { $$ = FALSE; }
opt_hold: /* EMPTY */ { $$ = 0; }
| WITH HOLD { $$ = CURSOR_OPT_HOLD; }
| WITHOUT HOLD { $$ = 0; }
;
/*****************************************************************************