Fix for an UPDATE on a virtual table when the WHERE clause matches zero rows.

Ticket #2244. (CVS 3652)

FossilOrigin-Name: 43bf797842f00a104f5c5619ad3215edddfc641b

manifest

@@ -1,5 +1,5 @@
-C Add\scomments\sto\sthe\stop\sof\skeywordhash.h.\s(CVS\s3651)
-D 2007-02-21T16:44:33
+C Fix\sfor\san\sUPDATE\son\sa\svirtual\stable\swhen\sthe\sWHERE\sclause\smatches\szero\srows.\nTicket\s#2244.\s(CVS\s3652)
+D 2007-02-21T16:52:12
 F Makefile.in 1fe3d0b46e40fd684e1e61f8e8056cefed16de9f
 F Makefile.linux-gcc 2d8574d1ba75f129aba2019f0b959db380a90935
 F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@@ -117,7 +117,7 @@ F src/test_server.c a6460daed0b92ecbc2531b6dc73717470e7a648c
 F src/test_tclvar.c 315e77c17f128ff8c06b38c08617fd07c825a95b
 F src/tokenize.c bb1732ef2b6fc2143f93ff28a45d3dcb04c1d396
 F src/trigger.c 8c55d31876013ed4e97ee7ce24478fbe00db49bb
-F src/update.c bdfcf3600f129bd5f06094781ab41cd7b7f5ab25
+F src/update.c 9a05e12b25fdd004aacd404e416e3310946910c5
 F src/utf.c 67ecb1032bc0b42c105e88d65ef9d9f626eb0e1f
 F src/util.c 91d4cb189476906639ae611927d939691d1365f6
 F src/vacuum.c b4569b08aaa5afb141af3f76d0315745db4e9e4b
@@ -346,7 +346,7 @@ F test/vacuum.test cf839fc3ff24d601057319bbb5c700ce9c8e0fb0
 F test/vacuum2.test 5aea8c88a65cb29f7d175296e7c819c6158d838c
 F test/varint.test ab7b110089a08b9926ed7390e7e97bdefeb74102
 F test/view.test 852bd4101e6d171c46ad682eb5c5faf662b2eba4
-F test/vtab1.test 03c4ad3180b78866993ef56af9d3b7c145ea4e4d
+F test/vtab1.test bbfeb479bc851993403d7f08cf071b34d0e3b4c2
 F test/vtab2.test 94bb3bf691ac10e34cf7dad46b1cf94b861d513c
 F test/vtab3.test f38d6d7d19f08bffdadce4d5b8cba078f8118587
 F test/vtab4.test a9d7104d41a787754a734740d7aa61c807a69f87
@@ -432,7 +432,7 @@ F www/tclsqlite.tcl bb0d1357328a42b1993d78573e587c6dcbc964b9
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl 97e2b5cd296f7d8057e11f44427dea8a4c2db513
-P b18a758a8fbd4b286ae3475af26f290d8cd583f0
-R 566ea5b1e0dfed2e2d241f4a3621febf
-U drh
-Z 7bc0929710516af4b73ecceb079cfb42
+P 0aa9ed5bbfb756967a6f761c5fc2f274a5466e2d
+R 98e0805557833324ac0d74cfb90c7da0
+U danielk1977
+Z e3ab03cd2238ee707de29025b46b5b2c

manifest.uuid

@@ -1 +1 @@
-0aa9ed5bbfb756967a6f761c5fc2f274a5466e2d
+43bf797842f00a104f5c5619ad3215edddfc641b

src/update.c

@@ -12,7 +12,7 @@
 ** This file contains C code routines that are called by the parser
 ** to handle UPDATE statements.
 **
-** $Id: update.c,v 1.134 2007/02/07 01:06:53 drh Exp $
+** $Id: update.c,v 1.135 2007/02/21 16:52:12 danielk1977 Exp $
 */
 #include "sqliteInt.h"
 
@@ -568,6 +568,7 @@ static void updateVirtualTable(
   int ephemTab;             /* Table holding the result of the SELECT */
   int i;                    /* Loop counter */
   int addr;                 /* Address of top of loop */
+  int iLabel;               /* Vdbe label used by the OP_Rewind op */
 
   /* Construct the SELECT statement that will find the new values for
   ** all updated rows. 
@@ -602,7 +603,8 @@ static void updateVirtualTable(
   ** Generate code to scan the ephemeral table and call VDelete and
   ** VInsert
   */
-  sqlite3VdbeAddOp(v, OP_Rewind, ephemTab, 0);
+  iLabel = sqlite3VdbeMakeLabel(v);
+  sqlite3VdbeAddOp(v, OP_Rewind, ephemTab, iLabel);
   addr = sqlite3VdbeCurrentAddr(v);
   sqlite3VdbeAddOp(v, OP_Column,  ephemTab, 0);
   if( pRowid ){
@@ -617,6 +619,7 @@ static void updateVirtualTable(
   sqlite3VdbeOp3(v, OP_VUpdate, 0, pTab->nCol+2, 
                      (const char*)pTab->pVtab, P3_VTAB);
   sqlite3VdbeAddOp(v, OP_Next, ephemTab, addr);
+  sqlite3VdbeResolveLabel(v, iLabel);
   sqlite3VdbeAddOp(v, OP_Close, ephemTab, 0);
 
   /* Cleanup */

test/vtab1.test

@@ -11,7 +11,7 @@
 # This file implements regression tests for SQLite library.  The
 # focus of this file is creating and dropping virtual tables.
 #
-# $Id: vtab1.test,v 1.39 2007/01/09 14:01:14 drh Exp $
+# $Id: vtab1.test,v 1.40 2007/02/21 16:52:12 danielk1977 Exp $
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl
@@ -889,6 +889,29 @@ do_test vtab1.11-5 {
     SELECT  glob(a,'2') FROM e
   }
 } {{2 1} {2 2}}
+ 
+# See ticket #2244
+#
+do_test vtab1.2244-1 {
+  execsql {
+    CREATE TABLE t2244(a, b);
+    CREATE VIRTUAL TABLE t2244e USING echo(t2244);
+    INSERT INTO t2244 VALUES('AA', 'BB');
+    INSERT INTO t2244 VALUES('CC', 'DD');
+    SELECT rowid, * FROM t2244e;
+  }
+} {1 AA BB 2 CC DD}
+do_test vtab1.2244-2 {
+  execsql {
+    SELECT * FROM t2244e WHERE rowid = 10;
+  }
+} {}
+do_test vtab1.2244-3 {
+  execsql {
+    UPDATE t2244e SET a = 'hello world' WHERE 0;
+    SELECT rowid, * FROM t2244e;
+  }
+} {1 AA BB 2 CC DD}
 
 unset -nocomplain echo_module_begin_fail
 finish_test