advisor.Rule{Item:"FUN.007", Severity:"L1", Summary:"不建议使用触发器", Content:"触发器的执行没有反馈和日志,隐藏了实际的执行步骤,当数据库出现问题是,不能通过慢日志分析触发器的具体执行情况,不易发现问题。在MySQL中,触发器不能临时关闭或打开,在数据迁移或数据恢复等场景下,需要临时drop触发器,可能影响到生产环境。", Case:"CREATE TRIGGER t1 AFTER INSERT ON work FOR EACH ROW INSERT INTO time VALUES(NOW());", Position:0, Func:func(*advisor.Query4Audit) advisor.Rule {...}}
advisor.Rule{Item:"FUN.009", Severity:"L1", Summary:"不建议使用自定义函数", Content:"不建议使用自定义函数", Case:"CREATE FUNCTION hello (s CHAR(20));", Position:0, Func:func(*advisor.Query4Audit) advisor.Rule {...}}
advisor.Rule{Item:"GRP.001", Severity:"L2", Summary:"不建议对等值查询列使用 GROUP BY", Content:"GROUP BY 中的列在前面的 WHERE 条件中使用了等值查询,对这样的列进行 GROUP BY 意义不大。", Case:"select film_id, title from film where release_year='2006' group by release_year", Position:0, Func:func(*advisor.Query4Audit) advisor.Rule {...}}
advisor.Rule{Item:"JOI.001", Severity:"L2", Summary:"JOIN 语句混用逗号和 ANSI 模式", Content:"表连接的时候混用逗号和 ANSI JOIN 不便于人类理解,并且MySQL不同版本的表连接行为和优先级均有所不同,当 MySQL 版本变化后可能会引入错误。", Case:"select c1,c2,c3 from t1,t2 join t3 on t1.c1=t2.c1,t1.c3=t3,c1 where id>1000", Position:0, Func:func(*advisor.Query4Audit) advisor.Rule {...}}
advisor.Rule{Item:"JOI.002", Severity:"L4", Summary:"同一张表被连接两次", Content:"相同的表在 FROM 子句中至少出现两次,可以简化为对该表的单次访问。", Case:"select tb1.col from (tb1, tb2) join tb2 on tb1.id=tb.id where tb1.id=1", Position:0, Func:func(*advisor.Query4Audit) advisor.Rule {...}}