1SET @start_value = @@global.general_log_file;
2SELECT @start_value;
3@start_value
4test.log
5'#---------------------FN_DYNVARS_004_01-------------------------#'
6SET @@global.general_log_file = DEFAULT;
7SET @a=concat(left(@@hostname, instr(concat(@@hostname, '.'), '.')-1), '.log');
8SELECT RIGHT(@@global.general_log_file, length(@a)) = @a;
9RIGHT(@@global.general_log_file, length(@a)) = @a
101
11'#--------------------FN_DYNVARS_004_02------------------------#'
12SET @@global.general_log_file = mytest.log;
13ERROR 42000: Incorrect argument type to variable 'general_log_file'
14SET @@global.general_log_file = 12;
15ERROR 42000: Incorrect argument type to variable 'general_log_file'
16'#----------------------FN_DYNVARS_004_03------------------------#'
17SELECT @@global.general_log_file = VARIABLE_VALUE
18FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES
19WHERE VARIABLE_NAME='general_log_file';
20@@global.general_log_file = VARIABLE_VALUE
211
22SET @@global.general_log_file= @start_value;
23