Java连接数据库入门案例

来源：互联网发布：大数据建设开展情况编辑：程序博客网时间：2024/06/05 06:41

package com.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.mysql.jdbc.Driver;

public class demo {
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
//注册驱动
//DriverManager.registerDriver(new com.mysql.jdbc.Driver());//方法一不建议用
Class.forName(“com.mysql.jdbc.Driver”);//方法二建议使用
//链接数据库
String url = “jdbc:mysql:///mydb”;
String user = “root”;
String pwd = “dcc1234”;
Connection connection = DriverManager.getConnection(url,user,pwd);
//向数据库中发送SQL语句
String sql = “select * from a”;
Statement state = connection.createStatement();
//创建结果集
ResultSet rs = state.executeQuery(sql);
//操作结果
while(rs.next()){
System.out.println(rs.getString(“a_name”));
}
//关闭资源
rs.close();
state.close();
connection.close();
}

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