package jdbc;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Connection;

import java.sql.Statement;

/**

* @author ： CodeWater

* @create ：2022-03-09-10:48

* @Function Description ：执行DQL查询语句（改用while处理if）

*/

public class JdbcDemo07 {

public static void main(String[] args) {

Connection conn = null;

Statement stmt = null;

ResultSet rs = null;

try {

Class.forName("com.mysql.jdbc.Driver");

conn = DriverManager.getConnection("jdbc:mysql:///db3", "root", "root");

String sql = " select * from account ";

stmt = conn.createStatement();

rs = stmt.executeQuery(sql);

while (rs.next()) {

int id = rs.getInt(1);

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

//获取这一行的第三列

double balance = rs.getDouble(3);

System.out.println(id + "---" + name + "---" + balance + "---");

}

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

} finally {

if (rs != null) {

try {

rs.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

if (stmt != null) {

try {

stmt.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

if (conn != null) {

try {

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

}