'#--------------------FN_DYNVARS_015_01-------------------------#'
SET @global_collation_connection = @@global.collation_connection;
SET @session_collation_connection = @@session.collation_connection;
SET @@global.collation_connection = latin1_danish_ci;
'connect (con1,localhost,root,,,,)'
'connection con1'
SELECT @@global.collation_connection;
@@global.collation_connection
latin1_danish_ci
SELECT @@session.collation_connection;
@@session.collation_connection
latin1_danish_ci
'#--------------------FN_DYNVARS_015_02-------------------------#'
'connection default'
DROP TABLE IF EXISTS t1;
'----check if collation_connection update character_set_connection---'
SET @@session.collation_connection = utf8_spanish_ci;
Warnings:
Warning	3778	'utf8_spanish_ci' is a collation of the deprecated character set UTF8MB3. Please consider using UTF8MB4 with an appropriate collation instead.
SELECT @@collation_connection, @@character_set_database;
@@collation_connection	@@character_set_database
utf8_spanish_ci	utf8mb4
'---check if collation_connection works for literal string comparision--'
SET @@session.collation_connection = latin1_swedish_ci;
SELECT 'mysql'='MySql';
'mysql'='MySql'
1
SELECT _latin2'mysql' COLLATE latin2_general_ci='MySql';
_latin2'mysql' COLLATE latin2_general_ci='MySql'
1
SELECT _utf8'mysql'=_utf8'MySql' COLLATE utf8_unicode_ci;
_utf8'mysql'=_utf8'MySql' COLLATE utf8_unicode_ci
1
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
SET @@session.collation_connection = latin1_general_cs;
SELECT 'mysql'='MySql';
'mysql'='MySql'
0
SELECT _latin2'mysql'COLLATE latin2_general_ci='MySql';
_latin2'mysql'COLLATE latin2_general_ci='MySql'
1
SELECT _utf8'mysql'COLLATE utf8_danish_ci=_utf8'MySql'COLLATE utf8_unicode_ci;
ERROR HY000: Illegal mix of collations (utf8_danish_ci,EXPLICIT) and (utf8_unicode_ci,EXPLICIT) for operation '='
'---collation_connection does not effect comparision with column---'
CREATE TABLE t1(a CHAR(20)CHARACTER SET latin1 COLLATE latin1_german2_ci);
INSERT INTO t1 VALUES(_latin1'Müller');
SET @@session.collation_connection = latin2_hungarian_ci;
SELECT * FROM t1 WHERE a=_latin1'Müller';
a
Müller
SET @@session.collation_connection = latin1_general_cs;
SELECT * FROM t1 WHERE a=_latin1'müller';
a
Müller
'check if string literal collation is used';
SELECT * FROM t1 WHERE a=_latin1'müller' COLLATE latin1_general_cs;
a
SELECT * FROM t1 WHERE a=_latin1'müller' COLLATE latin1_german1_ci;
a
Müller
DROP TABLE t1;
set names utf8mb4;
SET @@global.collation_connection = @global_collation_connection;
SET @@session.collation_connection = @session_collation_connection;