SQLite

**
** Various scripts scan this source file in order to generate HTML
** documentation, headers files, or other derived files.  The formatting
** of the code in this file is, therefore, important.  See other comments
** in this file for details.  If in doubt, do not deviate from existing
** commenting and indentation practices when changing or adding code.
**
** $Id: vdbe.c,v 1.363 2004/06/09 21:01:11 drh Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
#include "vdbeInt.h"

/*

  u8 rollback = pOp->p2;

  assert( i==1 || i==0 );
  assert( i==1 || rollback==0 );

  if( i!=db->autoCommit ){
    db->autoCommit = i;
    p->autoCommitOn |= i;
    if( pOp->p2 ){
      sqlite3RollbackAll(db);
    }
  }else{
    sqlite3SetString(&p->zErrMsg,
        (!i)?"cannot start a transaction within a transaction":(
        (rollback)?"cannot rollback - no transaction is active":

  unsigned uniqueCnt;     /* Used by OP_MakeRecord when P2!=0 */
  int errorAction;        /* Recovery action to do in case of an error */
  int inTempTrans;        /* True if temp database is transactioned */
  int returnStack[100];   /* Return address stack for OP_Gosub & OP_Return */
  int returnDepth;        /* Next unused element in returnStack[] */
  int nResColumn;         /* Number of columns in one row of the result set */
  char **azResColumn;     /* Values for one row of result */ 

  int popStack;           /* Pop the stack this much on entry to VdbeExec() */
  char *zErrMsg;          /* Error message written here */
  u8 resOnStack;          /* True if there are result values on the stack */
  u8 explain;             /* True if EXPLAIN present on SQL command */
  u8 autoCommitOn;        /* True if autocommit got turned on by this program */
};

/*
** The following are allowed values for Vdbe.magic
*/
#define VDBE_MAGIC_INIT     0x26bceaa5    /* Building a VDBE program */
#define VDBE_MAGIC_RUN      0xbdf20da3    /* VDBE is ready to execute */

    OsFile master;

    /* Select a master journal file name */
    do {
      u32 random;
      sqliteFree(zMaster);
      sqlite3Randomness(sizeof(random), &random);
      zMaster = sqlite3MPrintf("%s-mj%08X", zMainFile, random&0x7fffffff);
      if( !zMaster ){
        return SQLITE_NOMEM;
      }
    }while( sqlite3OsFileExists(zMaster) );

    /* Open the master journal. */
    assert( strlen(zMaster)<db->nMaster );

      ** using this handle and the vdbe program was successful or hit an
      ** 'OR FAIL' constraint. This means a commit is required, which is
      ** handled a little differently from the other options.
      */
      p->rc = vdbeCommit(db);
      if( p->rc!=SQLITE_OK ){
        sqlite3Error(p->db, p->rc, 0);
        if( p->rc==SQLITE_BUSY && p->autoCommitOn ){
          /* If we just now have turned autocommit on (meaning we just have
          ** finished executing a COMMIT command) but the commit fails due
          ** to lock contention, autocommit back off.  This gives the user
          ** the opportunity to try again after the lock that was preventing
          ** the commit has cleared. */
          db->autoCommit = 0;
        }else{
          /* If the command just executed was not a COMMIT command, then
          ** rollback whatever the results of that command were */
          xFunc = sqlite3BtreeRollback;
        }
      }
    }else{
      xFunc = sqlite3BtreeRollback;
    }
  }else{
    if( p->rc==SQLITE_OK || p->errorAction==OE_Fail ){
      xFunc = sqlite3BtreeCommitStmt;

#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this script is testing the ATTACH and DETACH commands
# and related functionality.
#
# $Id: attach2.test,v 1.15 2004/06/09 21:01:12 drh Exp $
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl


# Ticket #354

    INSERT INTO t1 VALUES(1, 2)
  }
} {1 {database is locked}}

lock_status 4.9.1 db {main shared temp reserved file2 shared}
lock_status 4.9.2 db2 {main reserved temp reserved file2 reserved}

set sqlite_os_trace 0
btree_breakpoint
do_test attach2-4.10 {

  # We cannot commit db2 while db is holding a read-lock
  catchsql {COMMIT} db2
} {1 {database is locked}}

lock_status 4.10.1 db {main shared temp reserved file2 shared}
lock_status 4.10.2 db2 {main reserved temp reserved file2 reserved}

do_test attach2-4.11 {
  # db is able to commit.
  catchsql {COMMIT}
} {0 {}}

lock_status 4.11.1 db {main unlocked temp unlocked file2 unlocked}
lock_status 4.11.2 db2 {main reserved temp reserved file2 reserved}

do_test attach2-4.12 {
  # Now we can commit db2
  catchsql {COMMIT} db2
} {0 {}}

lock_status 4.12.1 db {main unlocked temp unlocked file2 unlocked}
lock_status 4.12.2 db2 {main unlocked temp unlocked file2 unlocked}

do_test attach2-4.13 {
  execsql {SELECT * FROM file2.t1}
} {1 2}
do_test attach2-4.14 {
  execsql {INSERT INTO t1 VALUES(1, 2)}
} {}
do_test attach2-4.15 {




  execsql {SELECT * FROM t1} db2
} {1 2 1 2}

db close
db2 close
file delete -force test2.db

finish_test