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############## mysql-test\t\foreign_key_checks_func.test #####################
# #
# Variable Name: foreign_key_checks #
# Scope: SESSION #
# Access Type: Dynamic #
# Data Type: boolean #
# Default Value: NA #
# Range: NA #
# #
# #
# Creation Date: 2008-03-08 #
# Author: Rizwan #
# #
# Description: Test Cases of Dynamic System Variable foreign_key_checks #
# that checks the behavior of this variable #
# #
# Reference: http://dev.mysql.com/doc/refman/5.1/en/ #
# server-system-variables.html #
# #
###############################################################################
--source include/have_innodb.inc
--echo '#--------------------FN_DYNVARS_032_01-------------------------#'
####################################################################
# Check if setting foreign_key_checks is changed in new connection #
####################################################################
SET @@session.foreign_key_checks = 0;
# con1 will be default connection from now on
--echo 'connect (con1,localhost,root,,,,)'
connect (con1,localhost,root,,,,);
--echo 'connection con1'
connection con1;
SELECT @@session.foreign_key_checks;
SET @@session.foreign_key_checks = 1;
--echo 'connect (con2,localhost,root,,,,)'
connect (con2,localhost,root,,,,);
--echo 'connection con2'
connection con2;
SELECT @@session.foreign_key_checks;
disconnect con2;
--echo '#--------------------FN_DYNVARS_032_02-------------------------#'
#################################################################
# Begin the functionality Testing of foreign_key_checks #
#################################################################
--echo 'connection con1'
connection con1;
--disable_warnings
DROP TABLE IF EXISTS t1,t2;
--enable_warnings
CREATE TABLE t1(a INT PRIMARY KEY)ENGINE = INNODB;
CREATE TABLE t2(a INT PRIMARY KEY,b INT)ENGINE = INNODB;
ALTER TABLE t2
ADD CONSTRAINT fk FOREIGN KEY (b) REFERENCES t1 (a);
#===========================================================
--echo '---Check when foreign_key_checks is enabled---'
#===========================================================
SET @@session.foreign_key_checks = 1;
INSERT INTO t1 values (1),(2),(3);
INSERT INTO t2 values (10,1);
--Error ER_NO_REFERENCED_ROW_2
INSERT INTO t2 values (20,22);
#===========================================================
--echo '---Check when foreign_key_checks is disabled---'
#===========================================================
--Error ER_ROW_IS_REFERENCED_2
TRUNCATE t1;
SET @@session.foreign_key_checks = 0;
TRUNCATE t1;
TRUNCATE t2;
INSERT INTO t1 values (1),(2),(3);
INSERT INTO t2 values (10,1);
INSERT INTO t2 values (20,4);
--echo 'try enabling foreign_key_checks again';
SET @@session.foreign_key_checks = 1;
UPDATE t2 SET b=4 where a=20;
--echo 'Bug#35358: Updating an incorrect foreign key(inserted by disabling '
--echo 'foreign_key_checks)to the same value does not raise error after '
--echo 'enabling foreign_key_checks'
#==============================================================================
--echo 'Check when foreign_key_checks is enabled and FK constraint is re-created'
#==============================================================================
SET @@session.foreign_key_checks = 0;
TRUNCATE t2;
TRUNCATE t1;
INSERT INTO t1 values (1),(2),(3);
INSERT INTO t2 values (10,1),(20,4);
ALTER TABLE t2 DROP FOREIGN KEY fk;
SET @@session.foreign_key_checks = 1;
# Test disabled as error description is different. The resulting description has
# difference in code #sql-xxx_2 where xxx is different for each run.
#--Error ER_NO_REFERENCED_ROW_2
#ALTER TABLE t2
#ADD CONSTRAINT fk FOREIGN KEY (b) REFERENCES t1 (a);
# delete all rows with incorrect reference
DELETE FROM t2 WHERE b not in (SELECT a from t1);
ALTER TABLE t2
ADD CONSTRAINT fk FOREIGN KEY (b) REFERENCES t1 (a);
INSERT INTO t2 values (20,2);
SELECT * from t2;
--disable_warnings
DROP TABLE IF EXISTS t2;
DROP TABLE IF EXISTS t1;
--enable_warnings
##########################################################
# End of functionality Testing for foreign_key_checks #
##########################################################
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