java mysql调用

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

public class JdbcExample {
    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 mytable WHERE id = ?";
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
                pstmt.setInt(1, 1); // 假设我们要查询id为1的记录
                try (ResultSet rs = pstmt.executeQuery()) {
                    while (rs.next()) {
                        System.out.println(rs.getString("columnName")); // 输出查询结果
                    }
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}