ResultSet的使用方法：
ResultSet rs = st.executeQuery(sql)；
rs.next():移動游標，如果有下一條記錄則返回true,否則返回false;
rs.get(int): 填入列號獲得當前記錄的一個欄位的值，並將值轉換成型別，
rs.get(String):填入列名查詢出當前記錄的欄位值，並轉換成型別
rs.close():關閉資源;

JdbcUtil類：

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

public class JdbcUtil {

	private static String url = "jdbc:mysql://localhost:3306/books";
	private static String userName = "root";
	private static String password = "tiger";
	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public static Connection getConnection() {
		Connection conn = null;
		try {
			conn = DriverManager.getConnection(url, userName, password);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return conn;
	}

}
 

ResultSet的一個使用案例

import java.sql.*;

public class TestResultset {
	public static void main(String[] args) throws SQLException {
		// 查詢
		Connection conn = JdbcUtil.getConnection();
		String sql = "select * from account";
		try (Statement st = conn.createStatement(); 
				ResultSet rs = st.executeQuery(sql)) {
			while (rs.next()) {
				int i = rs.getInt(1);
				System.out.print(i + "\t");
				System.out.print(rs.getString("name") + "\t");
				System.out.print(rs.getInt(3) + "\n");
			}
		}

	}
}