ERROR 1418 (HY000): This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)

這是我們開啟了bin-log, 我們就必須指定我們的函數是否是
1 DETERMINISTIC 不確定的
2 NO SQL 沒有SQl語句，當然也不會修改數據
3 READS SQL DATA 只是讀取數據，當然也不會修改數據
4 MODIFIES SQL DATA 要修改數據
5 CONTAINS SQL 包含了SQL語句

其中在function里面，只有 DETERMINISTIC, NO SQL 和 READS SQL DATA 被支持。如果我們開啟了 bin-log, 我們就必須為我們的function指定一個參數。

SQL code
mysql> show variables like 'log_bin_trust_function_creators';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| log_bin_trust_function_creators | OFF   |
+---------------------------------+-------+
mysql> set global log_bin_trust_function_creators=1;
mysql> show variables like 'log_bin_trust_function_creators';
+---------------------------------+-------+
| Variable_name                   | Value |
+---------------------------------+-------+
| log_bin_trust_function_creators | ON    |