How to Retrieve the Query String from a PreparedStatement in Java?

Retrieving Query from PreparedStatement for Debugging

In Java, when working with java.sql.PreparedStatement, it can be useful to retrieve the final query string before executing it. This can be helpful for debugging purposes to ensure that the query is correctly formed.

Method:

Unfortunately, the JDBC API does not provide an explicit method for extracting the query from a prepared statement. However, depending on the JDBC driver implementation, calling PreparedStatement#toString() may return the complete SQL statement.

Example:

<code class="java">// Populate the prepared statement with parameters
preparedStatement.setString(1, "value");

// Retrieve the query string by calling toString()
System.out.println(preparedStatement.toString());</code>

Note:

The behavior of PreparedStatement#toString() in this regard is not standardized by the JDBC API. Hence, it may not always return the query string.

Alternative Approaches:

If the JDBC driver does not support toString(), consider using a third-party statement wrapper library, such as P6Spy, which logs calls to parameter setting methods and generates the query string based on the recorded information.

The above is the detailed content of How to Retrieve the Query String from a PreparedStatement in Java?. For more information, please follow other related articles on the PHP Chinese website!