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