问题描述
为了测试查询的正确性，我需要禁用数据库中的所有触发器.我看到在 information_schema 中存在表 TRIGGERS.是否可以使用此表暂时禁用所有触发器?例如.喜欢:
For test correctness of query I need disable all triggers in db. I see that in information_schema exists table TRIGGERS. Is possible temporarily disable all triggers using this table? E.g. like:
update TRIGGERS set TRIGGERS_SCHEMA='myschema_new'
where TRIGGERS_SCHEMA='myschema'
并在完成所有测试后返回所有触发器，例如:
and after finish all test return all triggers like:
update TRIGGERS set TRIGGERS_SCHEMA='myschema'
where TRIGGERS_SCHEMA='myschema_new'
这可能会损坏数据库还是触发器不起作用?我没有在文档中找到它.
May be this can corrupt db or after triggers will not works? I didn't found about it in documentation.
推荐答案
你不能直接禁用触发器，我不建议你按照你的建议去做，但你可以让触发器检查变量(在我的例子中)在执行触发器的内容之前，@disable_triggers) 是 NULL.例如:
You can't disable triggers directly and I wouldn't recommend doing what you're suggesting but you could have your trigger check if a variable (in my example below @disable_triggers) is NULL before executing the trigger's content. For example:
查询:
SET @disable_triggers = 1;
// Your update statement goes here.
SET @disable_triggers = NULL;
触发器:
IF @disable_triggers IS NULL THEN
// Do something use as the trigger isn't disabled.
END IF;
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