Hello. I'm finishing a java app that works with a mysql database. I need a way to capture mysql errors and display them with a customized text. For example, if I try to delete a row that has a foreign key to another table, I need to catch that error, and display a JOptionPane.showMessageDialog saying something like "Cannot delete the row. Please make sure the ID has no other links". Same with when I get the duplicity error on primary keys. Any ideas?
It may be that I have misunderstood your question, but if your app is using JDBC to update the database, then any database errors will cause SQLExceptions to be thrown.
Indeed, since SQLException is a checked exception, your java code must handle them.
SQLExceptions always included the message the database server generated. You'll need to parse the message and watch for specific patterns that denote your constraint violation errors and report when one appears.
SQLException also has a method called getErrorCode() that you can use to retrieve the error code. This error code is of course driver specific, but you can look up the possible values on the MySQL site (somewhere) and perform your own mapping from error codes to error messages.
I did a little searching and found this URL. For instance,