# 2001 September 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.  The

# focus of this script is database locks and the operation of the

# DEFERRED, IMMEDIATE, and EXCLUSIVE keywords as modifiers to the

# BEGIN command.

#

# $Id: lock3.test,v 1.1 2004/10/05 02:41:43 drh Exp $

set testdir [file dirname $argv0]

source $testdir/tester.tcl

# Establish two connections to the same database.  Put some

# sample data into the database.

#

do_test lock3-1.1 {

  sqlite3 db2 test.db

  execsql {

    CREATE TABLE t1(a);

    INSERT INTO t1 VALUES(1);

  }

  execsql {

    SELECT * FROM t1

  } db2

} 1

# Get a deferred lock on the database using one connection.  The

# other connection should still be able to write.

#

do_test lock3-2.1 {

  execsql {BEGIN DEFERRED TRANSACTION}

  execsql {INSERT INTO t1 VALUES(2)} db2

  execsql {END TRANSACTION}

  execsql {SELECT * FROM t1}

} {1 2}

# Get an immediate lock on the database using one connection.  The

# other connection should be able to read the database but not write

# it.

#

do_test lock3-3.1 {

  execsql {BEGIN IMMEDIATE TRANSACTION}

  catchsql {SELECT * FROM t1} db2

} {0 {1 2}}

do_test lock3-3.2 {

  catchsql {INSERT INTO t1 VALUES(3)} db2

} {1 {database is locked}}

do_test lock3-3.3 {

  execsql {END TRANSACTION}

} {}

# Get an exclusive lock on the database using one connection.  The

# other connection should be unable to read or write the database.

#

do_test lock3-4.1 {

  execsql {BEGIN EXCLUSIVE TRANSACTION}

  catchsql {SELECT * FROM t1} db2

} {1 {database is locked}}

do_test lock3-4.2 {

  catchsql {INSERT INTO t1 VALUES(3)} db2

} {1 {database is locked}}

do_test lock3-4.3 {

  execsql {END TRANSACTION}

} {}

catch {db2 close}

finish_test