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POHow to catch SQL statements within a MySQL database?
 

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  1. POHow to catch SQL statements within a MySQL database?
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    <p>Simply said I have to write an application to synchronise several database tables. Because of the requirements the changes should be put into a queue (in form of a SQL statement) and here lies the problem: I'm not able to change the existing application which uses the database to add the executed query directly into the queue. Therefore I need to catch all data changing SQL queries of specific tables (> 20 tables) in the database.</p> <p>I though about the following solutions:</p> <ul> <li>To catch directly the MySQL query with triggers like it is described <a href="https://dba.stackexchange.com/questions/8108/can-a-trigger-access-the-query-string">Can a trigger access the query string</a> (best answer for this case I could find!), but I couldn't get the query that actives the trigger - only the query that I used within it.</li> <li>To active the General Query Log. But I read about heavy performance considerations and so it isn't an arguable solution, because it would log even the tables I don't need (> 120 tables) and a lot of simple queries run on the database.</li> <li>To use a history table filled by trigger. With this I wouldn't save the SQL statement of the queries with this solution (which would slow down my current concept of synchronisation), but it would be possible to realise.</li> </ul> <p>Does someone know any other solution or how I could do the impossible by accessing the query within a trigger? </p> <p>I'm grateful about any suggestion!</p> <p>Related questions:<br> <a href="https://dba.stackexchange.com/questions/8108/can-a-trigger-access-the-query-string">Can a trigger access the query string</a> <br> <a href="https://dba.stackexchange.com/questions/7985/log-mysql-db-changing-queries-and-users/8085#8085">Log mysql db changing queries and users</a></p>
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    1. USZwie
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    1. COThe general query log is also a security risk, as the raw text of the queries is written out, which would also include any security-sensitive data (e.g. passwords, encryption keys, blah blah blah).
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      1. USMarc B
    2. COI didn't know this, but thx for the information. Just another reason why it's not suitable.
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