jdbc mysql update语句_java常用知识:jdbc练习update语句

package jdbc;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.sql.Statement;

public class Demo02jdbc {

public static void main(String[] args) {

Connection conn =null;

Statement stmt =null;

try {

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

String sql = "update stu_account set balance = 1500 where id = 3";

conn = DriverManager.getConnection("jdbc:mysql://服务器:端口/数据库名字", "账号", "密码");

stmt = conn.createStatement();

int count = stmt.executeUpdate(sql);

System.out.println(count);

if(count > 0){

System.out.println("执行成功");

}else{

System.out.println("执行失败");

}

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}finally{

if(stmt!=null){

try {

stmt.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

if(conn!=null){

try {

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

}