Throw an error preventing a table update in a MySQL trigger(引发错误，防止 MySQL 触发器中的表更新)
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问题描述
If I have a trigger before the update on a table, how can I throw an error that prevents the update on that table?
解决方案
Here is one hack that may work. It isn't clean, but it looks like it might work:
Essentially, you just try to update a column that doesn't exist.
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