MySQL 5.5。创建触发器时出错

我尝试在mysql 5.5中创建触发器，以防止在非空字段中插入空字符串：

CREATE TRIGGER check_empty_fields
    BEFORE INSERT ON customer_address
        FOR EACH ROW
        BEGIN
        IF new.customer_name = '' THEN SET new.customer_name = NULL ;
END IF;

        IF new.customer_address = '' THEN SET new.customer_address = NULL ;
END IF;

END; 

但我得到了这个错误：

MySQL said: Documentation

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 5 

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这种情况最好在UI验证或业务层而不是持久层中处理。为什么要在数据保存后检查数据？

customer\u address

既是表又是字段名，对吗？是的。Custommer address既是表名又是字段名