今天写了一段查询数据库的操作,如下

package MySQL;

import java.sql.*;

public class MySQL {
//JDBC驱动名以及数据库URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost:3306/test"; //数据库的用户名和密码
static final String USER = "root";
static final String PASS = "0825"; public static void main(String args[]) {
Connection conn = null;
Statement stmt = null;
try {
//注册JDBS驱动
Class.forName("com.mysql.jdbc.Driver"); //打开连接
System.out.println("连接数据库");
conn = DriverManager.getConnection(DB_URL, USER, PASS); //执行查询
System.out.println(" 实例化Statement对象...");
stmt = conn.createStatement();
String sql;
sql = "select * from users";
ResultSet rs = stmt.executeQuery(sql); //展开结果集数据库
while(rs.next()){
//通过字段见索引
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age"); //输出数据
System.out.println("Id:"+id);
System.out.println("名字:"+name);
System.out.println("年龄"+age);
}
//完成后进行关闭
rs.close();
stmt.close();
conn.close(); } catch (SQLException se) {
// 处理 JDBC 错误
se.printStackTrace();
} catch (Exception e) {
// 处理 Class.forName 错误
e.printStackTrace();
} finally {
// 关闭资源
try {
if (stmt != null) stmt.close();
} catch (SQLException se2) {
}// 什么都不做 try {
if (conn != null) conn.close();
} catch (SQLException se) {
se.printStackTrace();
}
System.out.println("Goodbye!");
}
}
}

 表结构和表内容:

 

好,那么我们来看一下运行的结果:

没有影响显示,但是却出现了警告,网上查询资料,原来是需要在DB_URL后面加上参数:

// 加了 ?useUnicode=true&characterEncoding=utf-8&useSSL=false
static final String DB_URL = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false";

  OK,成功运行,其实这个警告不影响使用,只是SQL版本的事情罢了

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