When creating a new database, delete any preexisting journal that might be

left over from a prior database with the same name.  Ticket #1152. (CVS 2387)

FossilOrigin-Name: 856e2ec9688affbfe496cf184f460b18408e3dc0

manifest

@@ -1,5 +1,5 @@
-C Allow\sthe\sdatabase\sname\sin\sa\sDETACH\sstatement\sto\sbe\squoted.\nTicket\s#1151.\s(CVS\s2386)
+C When\screating\sa\snew\sdatabase,\sdelete\sany\spreexisting\sjournal\sthat\smight\sbe\nleft\sover\sfrom\sa\sprior\sdatabase\swith\sthe\ssame\sname.\s\sTicket\s#1152.\s(CVS\s2387)
-D 2005-03-15T02:04:12
+D 2005-03-15T17:09:30
 F Makefile.in 5c00d0037104de2a50ac7647a5f12769795957a3
 F Makefile.linux-gcc 06be33b2a9ad4f005a5f42b22c4a19dab3cbb5c7
 F README a01693e454a00cc117967e3f9fdab2d4d52e9bc1
@@ -52,7 +52,7 @@ F src/os_unix.c d4823c6b3dd86e8cbb6a8f9d2fd6c4b3e722f8ee
 F src/os_unix.h 40b2fd1d02cfa45d6c3dea25316fd019cf9fcb0c
 F src/os_win.c bddeae1c3299be0fbe47077dd4e98b786a067f71
 F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
-F src/pager.c 2e795b3d85303b03daa1e18727a6aaa215a50980
+F src/pager.c 26a642c1238615bdea53d458ab6a4df7ca070a08
 F src/pager.h 70d496f372163abb6340f474288c4bb9ea962cf7
 F src/parse.y 0b6135268a7a29db35335d5b71b5a8791e02f91e
 F src/pragma.c 4b20dbc0f4b97f412dc511853d3d0c2e0d4adedc
@@ -144,6 +144,7 @@ F test/join.test e08471279574487cac0d17fa1ea66aca15c4de7f
 F test/join2.test f2171c265e57ee298a27e57e7051d22962f9f324
 F test/join3.test 6f0c774ff1ba0489e6c88a3e77b9d3528fb4fda0
 F test/join4.test cc6cafe85e11aacacd0abcd247a46bed251308f8
+F test/journal1.test ffc86f485293ece87005d00c6da1640554af7e22
 F test/lastinsert.test b6a1db3e1ce2d3f0d6afe99d445084f543b6feaa
 F test/laststmtchanges.test 07cbdabc52407c29e40abc25050f2434f044a6b1
 F test/limit.test 270b076f31c5c32f7187de5727e74da4de43e477
@@ -274,7 +275,7 @@ F www/tclsqlite.tcl e73f8f8e5f20e8277619433f7970060ab01088fc
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 092a01f5ef430d2c4acc0ae558d74c4bb89638a0
 F www/whentouse.tcl 3e522a06ad41992023c80ca29a048ae2331ca5bd
-P 644c6398e52481e5dda87671e1c196b26b1e4990
+P 24e887735256499e58dabe90463524d9e6eb08ce
-R c7a0fd10b1d2a373374c7ed8ae164835
+R 76fc7bf07ced1da0a2aa6b133619eb70
 U drh
-Z 2ee8d8f83569ed719ed59eea247ccc2d
+Z 568a4e730d583509fc67f9b125ab2918

manifest.uuid

@@ -1 +1 @@
-24e887735256499e58dabe90463524d9e6eb08ce
+856e2ec9688affbfe496cf184f460b18408e3dc0

src/pager.c

@@ -18,7 +18,7 @@
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 **
-** @(#) $Id: pager.c,v 1.193 2005/03/14 02:01:50 drh Exp $
+** @(#) $Id: pager.c,v 1.194 2005/03/15 17:09:30 drh Exp $
 */
 #include "sqliteInt.h"
 #include "os.h"
@@ -2178,6 +2178,26 @@ static PgHdr *pager_get_all_dirty_pages(Pager *pPager){
   return pList;
 }
 
+/*
+** Return TRUE if there is a hot journal on the given pager.
+** A hot journal is one that needs to be played back.
+**
+** If the current size of the database file is 0 but a journal file
+** exists, that is probably an old journal left over from a prior
+** database with the same name.  Just delete the journal.
+*/
+static int hasHotJournal(Pager *pPager){
+  if( !pPager->useJournal ) return 0;
+  if( !sqlite3OsFileExists(pPager->zJournal) ) return 0;
+  if( sqlite3OsCheckReservedLock(&pPager->fd) ) return 0;
+  if( sqlite3pager_pagecount(pPager)==0 ){
+    sqlite3OsDelete(pPager->zJournal);
+    return 0;
+  }else{
+    return 1;
+  }
+}
+
 /*
 ** Acquire a page.
 **
@@ -2203,7 +2223,7 @@ static PgHdr *pager_get_all_dirty_pages(Pager *pPager){
 */
 int sqlite3pager_get(Pager *pPager, Pgno pgno, void **ppPage){
   PgHdr *pPg;
-  int rc, n;
+  int rc;
 
   /* The maximum page number is 2^31. Return SQLITE_CORRUPT if a page
   ** number greater than this, or zero, is requested.
@@ -2234,10 +2254,7 @@ int sqlite3pager_get(Pager *pPager, Pgno pgno, void **ppPage){
     /* If a journal file exists, and there is no RESERVED lock on the
     ** database file, then it either needs to be played back or deleted.
     */
-    if( pPager->useJournal && 
+    if( hasHotJournal(pPager) ){
-        sqlite3OsFileExists(pPager->zJournal) &&
-        !sqlite3OsCheckReservedLock(&pPager->fd) 
-    ){
        int rc;
 
        /* Get an EXCLUSIVE lock on the database file. At this point it is
@@ -2415,13 +2432,12 @@ int sqlite3pager_get(Pager *pPager, Pgno pgno, void **ppPage){
     if( pPager->nExtra>0 ){
       memset(PGHDR_TO_EXTRA(pPg, pPager), 0, pPager->nExtra);
     }
-    n = sqlite3pager_pagecount(pPager);
     if( pPager->errMask!=0 ){
       sqlite3pager_unref(PGHDR_TO_DATA(pPg));
       rc = pager_errcode(pPager);
       return rc;
     }
-    if( n<(int)pgno ){
+    if( sqlite3pager_pagecount(pPager)<(int)pgno ){
       memset(PGHDR_TO_DATA(pPg), 0, pPager->pageSize);
     }else{
       int rc;

test/journal1.test

@@ -0,0 +1,59 @@
+# 2005 March 15
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.
+#
+# This file implements tests to make sure that leftover journals from
+# prior databases do not try to rollback into new databases.
+#
+# $Id: journal1.test,v 1.1 2005/03/15 17:09:30 drh Exp $
+
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# Create a smaple database
+#
+do_test journal1-1.1 {
+  execsql {
+    CREATE TABLE t1(a,b);
+    INSERT INTO t1 VALUES(1,randstr(10,400));
+    INSERT INTO t1 VALUES(2,randstr(10,400));
+    INSERT INTO t1 SELECT a+2, a||b FROM t1;
+    INSERT INTO t1 SELECT a+4, a||b FROM t1;
+    SELECT count(*) FROM t1;
+  }
+} 8
+
+# Make changes to the database and save the journal file.
+# Then delete the database.  Replace the the journal file
+# and try to create a new database with the same name.  The
+# old journal should not attempt to rollback into the new
+# database.
+#
+do_test journal1-1.2 {
+  execsql {
+    BEGIN;
+    DELETE FROM t1;
+  }
+  file copy -force test.db-journal test.db-journal-bu
+  execsql {
+    ROLLBACK;
+  }
+  db close
+  file delete test.db
+  file copy test.db-journal-bu test.db-journal
+  sqlite3 db test.db
+  catchsql {
+    SELECT * FROM sqlite_master
+  }
+} {0 {}}
+
+finish_test