diff options
Diffstat (limited to 'src/backend')
| -rw-r--r-- | src/backend/commands/portalcmds.c | 46 | ||||
| -rw-r--r-- | src/backend/parser/gram.y | 21 | ||||
| -rw-r--r-- | src/backend/tcop/utility.c | 4 |
3 files changed, 47 insertions, 24 deletions
diff --git a/src/backend/commands/portalcmds.c b/src/backend/commands/portalcmds.c index b1799e49f8c..3a670d8f899 100644 --- a/src/backend/commands/portalcmds.c +++ b/src/backend/commands/portalcmds.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/commands/portalcmds.c,v 1.6 2002/12/15 16:17:42 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/commands/portalcmds.c,v 1.7 2002/12/30 15:31:47 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -65,7 +65,7 @@ PortalCleanup(Portal portal) void PerformPortalFetch(char *name, bool forward, - int count, + long count, CommandDest dest, char *completionTag) { @@ -100,14 +100,48 @@ PerformPortalFetch(char *name, return; } - /* If zero count, we are done */ + /* If zero count, handle specially */ if (count == 0) - return; + { + bool on_row = false; + + /* Are we sitting on a row? */ + oldcontext = MemoryContextSwitchTo(PortalGetHeapMemory(portal)); + queryDesc = PortalGetQueryDesc(portal); + estate = queryDesc->estate; + if (portal->atStart == false && portal->atEnd == false) + on_row = true; + MemoryContextSwitchTo(oldcontext); + + if (dest == None) + { + /* MOVE 0 returns 0/1 based on if FETCH 0 would return a row */ + if (completionTag && on_row) + strcpy(completionTag, "MOVE 1"); + return; + } + else + { + /* If we are not on a row, FETCH 0 returns nothing */ + if (!on_row) + return; + + /* Since we are sitting on a row, return the row */ + /* Back up so we can reread the row */ + PerformPortalFetch(name, false /* backward */, 1, + None, /* throw away output */ + NULL /* do not modify the command tag */); + + /* Set up to fetch one row */ + count = 1; + forward = true; + } + } /* Internally, zero count processes all portal rows */ - if (count == INT_MAX) + if (count == LONG_MAX) count = 0; - + /* * switch into the portal context */ diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y index bb94d1f8e82..c19673fc422 100644 --- a/src/backend/parser/gram.y +++ b/src/backend/parser/gram.y @@ -11,7 +11,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.388 2002/12/12 20:35:13 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.389 2002/12/30 15:31:47 momjian Exp $ * * HISTORY * AUTHOR DATE MAJOR EVENT @@ -2591,13 +2591,6 @@ comment_text: FetchStmt: FETCH direction fetch_how_many from_in name { FetchStmt *n = makeNode(FetchStmt); - if ($2 == RELATIVE) - { - if ($3 == 0) - elog(ERROR, - "FETCH / RELATIVE at current position is not supported"); - $2 = FORWARD; - } if ($3 < 0) { $3 = -$3; @@ -2629,10 +2622,6 @@ FetchStmt: FETCH direction fetch_how_many from_in name | FETCH direction from_in name { FetchStmt *n = makeNode(FetchStmt); - if ($2 == RELATIVE) - { - $2 = FORWARD; - } n->direction = $2; n->howMany = 1; n->portalname = $4; @@ -2719,20 +2708,20 @@ FetchStmt: FETCH direction fetch_how_many from_in name direction: FORWARD { $$ = FORWARD; } | BACKWARD { $$ = BACKWARD; } - | RELATIVE { $$ = RELATIVE; } + | RELATIVE { $$ = FORWARD; } | ABSOLUTE { elog(NOTICE, "FETCH / ABSOLUTE not supported, using RELATIVE"); - $$ = RELATIVE; + $$ = FORWARD; } ; fetch_how_many: Iconst { $$ = $1; } | '-' Iconst { $$ = - $2; } - | ALL { $$ = INT_MAX; } - | LAST { $$ = INT_MAX; } + | ALL { $$ = LONG_MAX; } + | LAST { $$ = LONG_MAX; } | NEXT { $$ = 1; } | PRIOR { $$ = -1; } ; diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c index 40228601d72..cc0f139b2db 100644 --- a/src/backend/tcop/utility.c +++ b/src/backend/tcop/utility.c @@ -10,7 +10,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.185 2002/12/06 05:00:31 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/tcop/utility.c,v 1.186 2002/12/30 15:31:48 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -257,7 +257,7 @@ ProcessUtility(Node *parsetree, FetchStmt *stmt = (FetchStmt *) parsetree; char *portalName = stmt->portalname; bool forward; - int count; + long count; forward = (bool) (stmt->direction == FORWARD); |