JDBK与Java的首次连接

package JDBC;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class MySQL {
    public static void main(String[] args) throws Exception {

        //导入驱动jar包
        //2.注册驱动
        Class.forName("com.mysql.jdbc.Driver");
        //3.获取数据库的连接对象
        Connection conn= DriverManager.getConnection("jdbc:mysql://localhost:3306/first","root","root");
        //4.定义SQL语句
        String sql="update emp set salary=20000 where id=1001 ";
        //5.获取执行sql的对象 Statement
        Statement stmt= conn.createStatement();
        //6.执行sql
        int count=stmt.executeUpdate(sql);
        //7.处理结果
        System.out.println(count);
        //8.释放资源
        stmt.close();
        conn.close();


    }
}