How to Retrieve the PreparedStatement Query for Debugging in Java?

Retrieving PreparedStatement Query for Debugging

When working with java.sql.PreparedStatement, it can be useful for debugging purposes to retrieve the final query before it is executed. This can be achieved through the toString() method, depending on the capabilities of the JDBC driver in use.

In many cases, the JDBC driver may provide the complete SQL statement by calling PreparedStatement#toString(). To check this, simply use the following code:

System.out.println(preparedStatement);

For example, PostgreSQL 8.x and MySQL 5.x are known to return the SQL statement using this method.

However, if the JDBC driver does not support this feature, an alternative approach is to use a statement wrapper that records all calls to setXxx() methods and generates the SQL string based on this information. A library like P6Spy provides this functionality.

Additionally, you can consider reaching out to the development team of your JDBC driver to suggest the implementation of the desired toString() behavior.

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