# 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