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# # 2010-01-20 OBN - added check of I_S values after variable value changed # SET @start_global_value = @@global.old_alter_table; SELECT @start_global_value; # # exists as global and session # select @@global.old_alter_table; select @@session.old_alter_table; show global variables like 'old_alter_table'; show session variables like 'old_alter_table'; --disable_warnings select * from information_schema.global_variables where variable_name='old_alter_table'; select * from information_schema.session_variables where variable_name='old_alter_table'; --enable_warnings # # show that it's writable # set global old_alter_table=1; set session old_alter_table=ON; select @@global.old_alter_table; select @@session.old_alter_table; show global variables like 'old_alter_table'; show session variables like 'old_alter_table'; --disable_warnings select * from information_schema.global_variables where variable_name='old_alter_table'; select * from information_schema.session_variables where variable_name='old_alter_table'; --enable_warnings # # Display the default value # SET @@global.old_alter_table=DEFAULT; SELECT @@global.old_alter_table; SET @@session.old_alter_table=DEFAULT; SELECT @@session.old_alter_table; # # incorrect types # --error ER_WRONG_TYPE_FOR_VAR set global old_alter_table=1.1; --error ER_WRONG_TYPE_FOR_VAR set global old_alter_table=1e1; --error ER_WRONG_VALUE_FOR_VAR set global old_alter_table="foo"; SET @@global.old_alter_table = @start_global_value; SELECT @@global.old_alter_table;