MYSQL触发器更新复制整行

Question

I am trying to create a trigger to copy an entire row to an audit table on any UPDATE .

I have 2 tables

Frequencies and Frequencies_Audit

This is my trigger.

create trigger auditlog 
before update on frequencies
for each row insert into
frequencies_audit select frequencies.*;

When I update the record I get Unknown Table frequencies .

I don't want to have to enter each field name separately if possible since we are constantly adding columns in the database.

Answer 1

Rather than BEFORE UPDATE , you can write AFTER UPDATE trigger as follow ::

DELIMITER //
CREATE TRIGGER auditlog AFTER UPDATE ON frequencies
FOR EACH ROW BEGIN  
    INSERT INTO frequencies_audit select * from frequencies where freqId = NEW.freqId;
END;//
DELIMITER ;

freqId is just a name of Id column. Replace it with the name of Id column in your frequencies table.

Answer 2

You can try this

create trigger auditlog 
AFTER UPDATE on frequencies
for each row insert into
frequencies_audit select * from frequencies;

Because in MYSQL if you wrote select TableName.* then it always return an error Unknown table TableName .

May be it helps you.