task 9 3

package task9;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.CallableStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class callablefunctions {
    // Database credentials and URL
    static final String JDBC_URL = "jdbc:mysql://localhost:3306/varshitha"; // Replace with your database name
    static final String JDBC_USER = "root"; // Replace with your MySQL username
    static final String JDBC_PASSWORD = "root"; // Replace with your MySQL password

    public static void main(String[] args) {
        // SQL query to call the stored function
        String callFunctionSQL = "{? = call getAverageAgeByGrade(?)}";

        try (Connection connection = DriverManager.getConnection(JDBC_URL, JDBC_USER, JDBC_PASSWORD);
             CallableStatement callableStatement = connection.prepareCall(callFunctionSQL)) {

            // Register the output parameter (the average age)
            callableStatement.registerOutParameter(1, java.sql.Types.DOUBLE);
            // Set the input parameter (the grade for which we want the average age)
            callableStatement.setString(2, "A"); // Change the grade as needed

            // Execute the function
            callableStatement.execute();

            // Retrieve the output parameter
            double averageAge = callableStatement.getDouble(1);
            System.out.println("Average age of students with grade 'A': " + averageAge);

        } catch (SQLException e) {
            System.out.println("SQL Exception: " + e.getMessage());
        }
    }
}