import java.sql.*;

​

public class Main {

    public static void main(String[] args) {

        String url = "jdbc:mysql://localhost:3306/mydatabase";

        String username = "myuser";

        String password = "mypassword";

        try (Connection conn = DriverManager.getConnection(url, username, password)) {

            String sql = "SELECT * FROM users WHERE age > ?";

            PreparedStatement statement = conn.prepareStatement(sql);

            statement.setInt(1, 18); // Set the value for the placeholder

            ResultSet resultSet = statement.executeQuery();

            while (resultSet.next()) {

                String name = resultSet.getString("name");

                int age = resultSet.getInt("age");

                System.out.println("Name: " + name + ", Age: " + age);

            }

        } catch (SQLException e) {

            e.printStackTrace();

        }

    }

}

import java.sql.*;

​

public class PreparedStatementsExample {

    public static void main(String[] args) {

        try {

            // Establish a connection to the database

            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/exampleDB", "username", "password");

​

            // Create a prepared statement

            String query = "SELECT * FROM users WHERE age > ?";

            PreparedStatement preparedStatement = connection.prepareStatement(query);

​

            // Set parameter values for the prepared statement

            int minimumAge = 18;

            preparedStatement.setInt(1, minimumAge);

​

            // Execute the prepared statement

            ResultSet resultSet = preparedStatement.executeQuery();

​

            // Process the results

            while (resultSet.next()) {

                String name = resultSet.getString("name");

                int age = resultSet.getInt("age");

                System.out.println("Name: " + name + ", Age: " + age);

            }

​

            // Close the resources

            resultSet.close();

            preparedStatement.close();

            connection.close();

​

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.SQLException;

​

public class Main {

​

    public static void main(String[] args) {

        // Define database URL, username, and password

        String url = "jdbc:mysql://localhost:3306/mydatabase";

        String username = "root";

        String password = "password";

​

        try {

            // Establish a connection to the database

            Connection connection = DriverManager.getConnection(url, username, password);

​

            // Prepare a SQL statement with parameters

            String sql = "INSERT INTO users (name, age) VALUES (?, ?)";

            PreparedStatement statement = connection.prepareStatement(sql);

​

            // Set the values for the parameters

            statement.setString(1, "John Doe");

            statement.setInt(2, 25);

​

            // Execute the SQL statement

            int rowsInserted = statement.executeUpdate();

            System.out.println(rowsInserted + " row(s) inserted.");

​

            // Close the statement and connection

            statement.close();

            connection.close();

        } catch (SQLException e) {

            e.printStackTrace();

        }

    }

}