SQLite

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the implementation of the sqlite3_backup_XXX() 
** API functions and the related features.
**
** $Id: backup.c,v 1.6 2009/02/04 16:56:19 drh Exp $
*/
#include "sqliteInt.h"
#include "btreeInt.h"

/* Macro to find the minimum of two numeric values.
*/
#ifndef MIN

  ** a malfunction or a deadlock.
  */
  sqlite3_mutex_enter(pSrcDb->mutex);
  sqlite3_mutex_enter(pDestDb->mutex);

  if( pSrcDb==pDestDb ){
    sqlite3Error(
        pDestDb, SQLITE_ERROR, "Source and destination handles must be distinct"
    );
    p = 0;
  }else {
    /* Allocate space for a new sqlite3_backup object */
    p = (sqlite3_backup *)sqlite3_malloc(sizeof(sqlite3_backup));
    if( !p ){
      sqlite3Error(pDestDb, SQLITE_NOMEM, 0);

**
*************************************************************************
** Main file for the SQLite library.  The routines in this file
** implement the programmer interface to the library.  Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.526 2009/02/04 03:59:25 shane Exp $
*/
#include "sqliteInt.h"

#ifdef SQLITE_ENABLE_FTS3
# include "fts3.h"
#endif
#ifdef SQLITE_ENABLE_RTREE

  ** some prepared statements internally.
  */
  sqlite3VtabRollback(db);

  /* If there are any outstanding VMs, return SQLITE_BUSY. */
  if( db->pVdbe ){
    sqlite3Error(db, SQLITE_BUSY, 
        "Unable to close due to unfinalised statements");
    sqlite3_mutex_leave(db->mutex);
    return SQLITE_BUSY;
  }
  assert( sqlite3SafetyCheckSickOrOk(db) );

  for(j=0; j<db->nDb; j++){
    Btree *pBt = db->aDb[j].pBt;
    if( pBt && sqlite3BtreeIsInBackup(pBt) ){
      sqlite3Error(db, SQLITE_BUSY, 
          "Unable to close due to unfinished backup operation");
      sqlite3_mutex_leave(db->mutex);
      return SQLITE_BUSY;
    }
  }

  /* Free any outstanding Savepoint structures. */
  sqlite3CloseSavepoints(db);

  ** is being overridden/deleted but there are no active VMs, allow the
  ** operation to continue but invalidate all precompiled statements.
  */
  p = sqlite3FindFunction(db, zFunctionName, nName, nArg, (u8)enc, 0);
  if( p && p->iPrefEnc==enc && p->nArg==nArg ){
    if( db->activeVdbeCnt ){
      sqlite3Error(db, SQLITE_BUSY, 
        "Unable to delete/modify user-function due to active statements");
      assert( !db->mallocFailed );
      return SQLITE_BUSY;
    }else{
      sqlite3ExpirePreparedStatements(db);
    }
  }

  ** are no active VMs, invalidate any pre-compiled statements.
  */
  nName = sqlite3Strlen(db, zName);
  pColl = sqlite3FindCollSeq(db, (u8)enc2, zName, nName, 0);
  if( pColl && pColl->xCmp ){
    if( db->activeVdbeCnt ){
      sqlite3Error(db, SQLITE_BUSY, 
        "Unable to delete/modify collation sequence due to active statements");
      return SQLITE_BUSY;
    }
    sqlite3ExpirePreparedStatements(db);

    /* If collation sequence pColl was created directly by a call to
    ** sqlite3_create_collation, and not generated by synthCollSeq(),
    ** then any copies made by synthCollSeq() need to be invalidated.

# 2008 January 30
#
# 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.  The
# focus of this file is testing the sqlite3_backup_XXX API.
#
# $Id: backup.test,v 1.1 2009/02/03 16:51:25 danielk1977 Exp $

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

#---------------------------------------------------------------------
# Test organization:
#

} {B}
do_test backup-4.3.2 {
  db2 cache flush
  sqlite3_close db2
} {SQLITE_BUSY}
do_test backup-4.3.3 {
  sqlite3_errmsg db2
} {Unable to close due to unfinished backup operation}
do_test backup-4.3.4 {
  B step 50
} {SQLITE_DONE}
do_test backup-4.3.5 {
  B finish
} {SQLITE_OK}

do_test backup-4.4.1 {
  set rc [catch {sqlite3_backup B db main db aux1}]
  list $rc [sqlite3_errcode db] [sqlite3_errmsg db]
} {1 SQLITE_ERROR {Source and destination handles must be distinct}}
db close
db2 close

do_test backup-4.5.1 {
  catch { file delete -force test.db }
  sqlite3 db test.db
  sqlite3 db2 :memory:

#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file tests the various conditions under which an SQLITE_SCHEMA
# error should be returned.
#
# $Id: schema.test,v 1.8 2007/10/09 08:29:33 danielk1977 Exp $

#---------------------------------------------------------------------
# When any of the following types of SQL statements or actions are 
# executed, all pre-compiled statements are invalidated. An attempt
# to execute an invalidated statement always returns SQLITE_SCHEMA.
#
# CREATE/DROP TABLE...................................schema-1.*

  sqlite_delete_function $::DB tstfunc
} {SQLITE_BUSY}
do_test schema-11.3 {
  set rc [catch {
    db function tstfunc {}
  } msg]
  list $rc $msg
} {1 {Unable to delete/modify user-function due to active statements}}
do_test schema-11.4 {
  sqlite3_finalize $::STMT
} {SQLITE_OK}
do_test schema-11.5 {
  db collate tstcollate {}
  set sql {SELECT * FROM abc}
  set ::STMT [sqlite3_prepare $::DB $sql -1 TAIL]
  sqlite3_step $::STMT
} {SQLITE_ROW}
do_test schema-11.6 {
  sqlite_delete_collation $::DB tstcollate
} {SQLITE_BUSY}
do_test schema-11.7 {
  set rc [catch {
    db collate tstcollate {}
  } msg]
  list $rc $msg
} {1 {Unable to delete/modify collation sequence due to active statements}}
do_test schema-11.8 {
  sqlite3_finalize $::STMT
} {SQLITE_OK}

# The following demonstrates why statements need to be expired whenever
# there is a rollback (explicit or otherwise).
#

#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file tests the various conditions under which an SQLITE_SCHEMA
# error should be returned.  This is a copy of schema.test that
# has been altered to use sqlite3_prepare_v2 instead of sqlite3_prepare
#
# $Id: schema2.test,v 1.3 2007/10/09 08:29:33 danielk1977 Exp $

#---------------------------------------------------------------------
# When any of the following types of SQL statements or actions are 
# executed, all pre-compiled statements are invalidated. An attempt
# to execute an invalidated statement always returns SQLITE_SCHEMA.
#
# CREATE/DROP TABLE...................................schema2-1.*

  sqlite_delete_function $::DB tstfunc
} {SQLITE_BUSY}
do_test schema2-11.3 {
  set rc [catch {
    db function tstfunc {}
  } msg]
  list $rc $msg
} {1 {Unable to delete/modify user-function due to active statements}}
do_test schema2-11.4 {
  sqlite3_finalize $::STMT
} {SQLITE_OK}
do_test schema2-11.5 {
  db collate tstcollate {}
  set sql {SELECT * FROM abc}
  set ::STMT [sqlite3_prepare_v2 $::DB $sql -1 TAIL]
  sqlite3_step $::STMT
} {SQLITE_ROW}
do_test schema2-11.6 {
  sqlite_delete_collation $::DB tstcollate
} {SQLITE_BUSY}
do_test schema2-11.7 {
  set rc [catch {
    db collate tstcollate {}
  } msg]
  list $rc $msg
} {1 {Unable to delete/modify collation sequence due to active statements}}
do_test schema2-11.8 {
  sqlite3_finalize $::STMT
} {SQLITE_OK}

finish_test