How to Get the Actual SQL Executed by a PreparedStatement in Java?

Getting the Actual SQL Executed by a PreparedStatement

In Java programming, a common utility method is encountered that opens a database connection, constructs a PreparedStatement, executes it, and returns a result set. For debugging purposes, logging the actual SQL statement that was executed would be beneficial, but simply logging the original SQL template (with placeholders) is not sufficient.

Can't Get PreparedStatement's SQL

Unfortunately, due to the nature of prepared statements, there is no way to retrieve the actual SQL query that will be executed. Prepared statements are divided into two components: the statement itself (with placeholders) and the bound variables. The database server analyzes and parses the statement, and the bound variables are used to execute the statement. However, no reconstruction of the actual SQL query occurs on either the Java or database side.

Debugging Alternatives

For debugging purposes, there are two alternative solutions:

1. Output Statement Code: Log the statement code with placeholders and the list of bound variables.
2. Build Manual SQL Query: Construct a SQL query manually by combining the statement code with the bound variable values.

Example

Consider a statement with placeholders:

SELECT * FROM USERS WHERE ID = ?

And bound variable:

int userId = 123;

The manual SQL query would be:

SELECT * FROM USERS WHERE ID = 123

Which would then be logged for debugging purposes.

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