How Can I Safely Pass Parameters to a JDBC PreparedStatement for User Authentication?

Passing Parameters to a JDBC PreparedStatement

Attempting to validate user credentials by fetching specific rows from a database, you have encountered an issue with your Java code. Your objective is to select a row based on a parameter passed to the constructor of the Validation class. However, your current approach is unsuccessful.

The problem lies in the way you are setting the userID parameter in the SQL query. Directly inserting the parameter value into the query string makes the statement vulnerable to SQL injection attacks. Additionally, it can lead to improper formatting.

To resolve this, you should utilize the setString() method of the PreparedStatement class. This technique not only ensures that the statement is formatted appropriately but also shields it from SQL injection.

The correct code should look like this:

statement = con.prepareStatement("SELECT * from employee WHERE userID = ?");
statement.setString(1, userID);

In essence, you should parameterize the userID value and set it using the setString() method. This practice enhances the security and reliability of your database interactions.

For a comprehensive guide on using PreparedStatements effectively in Java, please refer to the Java Tutorials.

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