AI BriefingFinding the Missing Escape Character in Exposed (feat. MySQL)
Key point
This traces, through debugging, the cause of a MySQL escape string handling error that occurred while using the Exposed ORM.
Details
During KakaoBank's service operations, a SQLSyntaxErrorException occurred in an environment using Exposed and MySQL. The cause was that a backslash (\) character entered by a user was not properly escaped when inserted into the database.
As a result of debugging, it was discovered that the query printed in the logs differed from the query actually sent to the DB. By tracing the com.mysql.cj.NativeSession.execSQL method through the IDE debugger, it was confirmed that while escaping is performed in the INSERT statement, escaping is missing for the columns in the ON DUPLICATE KEY UPDATE clause.
This process goes beyond simply fixing the error, showing how understanding how the open source operates and tracking down the root cause through debugging can be achieved.
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