How Can I Retrieve the Constructed Query from a PreparedStatement in Java?

Retrieving the Constructed Query from a PreparedStatement

When working with prepared statements in Java using java.sql.PreparedStatement, it becomes essential to debug and verify the actual query being executed. However, there is no inherent method within the JDBC API to directly retrieve the constructed query.

Solution

Fortunately, specific JDBC drivers may provide a workaround through the PreparedStatement#toString() method.

Check with the Driver Implementation

Drivers such as PostgreSQL 8.x and MySQL 5.x JDBC drivers may return the complete SQL query when calling PreparedStatement#toString(). To utilize this feature:

<code class="java">System.out.println(preparedStatement);</code>

Alternative Option

If the JDBC driver lacks this functionality, consider using a statement wrapper that intercepts all calls to setXxx() methods and constructs a SQL string when toString() is called. A library like P6Spy offers such capabilities.

Request Implementation

In cases where the driver does not support retrieving the query, submit a feature request to the development team. The toString() behavior can be implemented to provide access to the constructed query for debugging purposes.

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