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############## mysql-test\t\group_concat_max_len_func.test #################### # # # Variable Name: group_concat_max_len # # Scope: GLOBAL | SESSION # # Access Type: Dynamic # # Data Type: numeric # # Default Value: 1024 # # Minimum value: 4 # # # # # # Creation Date: 2008-03-07 # # Author: Salman Rawala # # # # Last modification: # # 2008-11-14 mleich Fix Bug#40644 main.group_concat_max_len_func random # # failures # # + minor improvements # # # # Description: Test Cases of Dynamic System Variable group_concat_max_len # # that checks the functionality of this variable # # # # Reference: # # http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html # # # ############################################################################### SET @save = @@global.group_concat_max_len; --disable_warnings DROP TABLE IF EXISTS t1; --enable_warnings ######################### # Creating new table # ######################### --echo ## Creating new table t1 ## CREATE TABLE t1 ( id INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (id), rollno INT NOT NULL, name VARCHAR(30) ); --echo '#--------------------FN_DYNVARS_034_01-------------------------#' ######################################################################## # Setting initial value of group_concat_max_len, inserting some rows # & creating 2 new connections ######################################################################## --echo ## Setting initial value of variable to 4 ## SET @@global.group_concat_max_len = 4; --echo ## Inserting some rows in table ## INSERT INTO t1(rollno, name) VALUES(1, 'Record_1'); INSERT INTO t1(rollno, name) VALUES(2, 'Record_2'); INSERT INTO t1(rollno, name) VALUES(1, 'Record_3'); INSERT INTO t1(rollno, name) VALUES(3, 'Record_4'); INSERT INTO t1(rollno, name) VALUES(1, 'Record_5'); INSERT INTO t1(rollno, name) VALUES(3, 'Record_6'); INSERT INTO t1(rollno, name) VALUES(4, 'Record_7'); INSERT INTO t1(rollno, name) VALUES(4, 'Record_8'); # The following "auxiliary" select ensures that all records are on disk # = result sets got by parallel sessions cannot suffer from effects # caused by the MyISAM feature "concurrent_inserts". SELECT * FROM t1 ORDER BY id; --echo ## Creating two new connections ## connect (test_con1,localhost,root,,); connect (test_con2,localhost,root,,); --echo '#--------------------FN_DYNVARS_034_02-------------------------#' ############################################################################### # Verifying initial behavior of variable by concatinating values greater than 4 ############################################################################### --echo ## Connecting with test_con1 ## connection test_con1; --source include/turn_off_only_full_group_by.inc --echo ## Accessing data and using group_concat on column whose value is greater than 4 ## SELECT id, rollno, GROUP_CONCAT(name) FROM t1 GROUP BY rollno; --echo ## Changing session value of variable and verifying its behavior, ## --echo ## warning should come here ## SET @@session.group_concat_max_len = 10; SELECT id, rollno, GROUP_CONCAT(name) FROM t1 GROUP BY rollno; --echo '#--------------------FN_DYNVARS_034_03-------------------------#' ############################################################################## # Verifying behavior of variable by increasing session value of variable # ############################################################################## --echo ## Connecting with new connection test_con2 ## connection test_con2; --source include/turn_off_only_full_group_by.inc --echo ## Verifying initial value of variable. It should be 4 ## SELECT @@session.group_concat_max_len = 4; --echo ## Setting session value of variable to 20 and verifying variable is concating ## --echo ## column's value to 20 or not ## SET @@session.group_concat_max_len = 20; --echo ## Verifying value of name column, it should not me more than 20 characters ## --echo ## Warning should come here ## SELECT id, rollno, GROUP_CONCAT(name) FROM t1 GROUP BY rollno; --echo '#--------------------FN_DYNVARS_034_04-------------------------#' ############################################################################### # Verifying behavior of variable by increasing session value of variable # # greater than the maximum concat length of name column # ############################################################################### --echo ## Setting session value of variable to 26. No warning should appear here ## --echo ## because the value after concatination is less than 30 ## SET @@session.group_concat_max_len = 26; --echo ## Verifying value of name column, it should not give warning now ## SELECT id, rollno, GROUP_CONCAT(name) FROM t1 GROUP BY rollno; ############################################################ # Disconnecting all connection & dropping table # ############################################################ --echo ## Dropping table t1 ## DROP TABLE t1; --echo ## Disconnecting both the connection ## disconnect test_con2; disconnect test_con1; connection default; SET @@global.group_concat_max_len = @save;