ERROR 1418 (HY000): This function has none of DETERMINISTIC, NO SQL, or READS SQ L DATA in its decla
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)
错误的原因：
Mysql配置了复制，复制功能也就意味着Master数据的变化，会同步到Slave。对于函数，Mysql要求函数不能修改数据。
解决办法：
1、创建函数的时候，明确说明我不会修改数据。创建函数的时候有5个选项：
a、DETERMINISTIC 确定性的
b、NO SQL 没有包含SQl语句，当然也不会修改数据
c、READS SQL DATA 只是读取数据，当然也不会修改数据
d、MODIFIES SQL DATA 要修改数据
e、CONTAINS SQL 包含了SQL语句
怎么理解DETERMINISTIC确定性的？
可以认为输入相同，方法执行过程，输出也是相同的。也就是方法的可重入性。不可重入的方法：方法内使用了静态的数据，使用了malloc和free，使用了标准I/O函数。
创建函数必须明确指出a、b、c三个选项中的一个，才能执行成功。如下：
mysql> show variables like 'log_bin%';
+---------------------------------+-------+
| Variable_name | Value |
+---------------------------------+-------+
| log_bin | ON |
| log_bin_trust_function_creators | OFF |
| log_bin_trust_routine_creators | OFF |
+---------------------------------+-------+
3 rows in set
mysql> create function fun1 (num int(9)) returns int(9)
begin
return 1;
end;
1418 - 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)
mysql> create function fun1 (num int(9)) returns int(9) reads sql data
begin
return 1;
end;
Query OK, 0 rows affected
mysql> drop function fun1;
Query OK, 0 rows affected
mysql> create function fun1 (num int(9)) returns int(9) deterministic
begin
return 1;
end;
Query OK, 0 rows affected
2、告诉Mysql，信任我，方法不会修改数据，Mysql不再检查，即使修改了数据。这个时候要靠你信守承诺，否则后果自负。
mysql> drop function fun1;
Query OK, 0 rows affected
mysql> set global log_bin_trust_function_creators=on;
Query OK, 0 rows affected
mysql> show variables like 'log_bin%';
+---------------------------------+-------+
| Variable_name | Value |
+---------------------------------+-------+
| log_bin | ON |
| log_bin_trust_function_creators | ON |
| log_bin_trust_routine_creators | ON |
+---------------------------------+-------+
3 rows in set
mysql> create function fun1 (num int(9)) returns int(9) modifies sql data
begin
return 1;
end;
Query OK, 0 rows affected