JDBCdemo

1.JDBC是什么?

Java DataBase Connectivity(Java语言连接数据库)

2.JDBC的本质是什么?

JDBC是sun公司制定的一套接口(interface),数据库厂商来实现接口,厂商实现类称为驱动,

mysql驱动,orcle驱动等等

3.实现的demo案例(JDBC实现的六步):

package com.sinosoft.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class JDBCTest {
    public static void main(String[] args) {
        Connection conn=null;
        
        PreparedStatement ps=null;
        ResultSet rs=null;
        try {
            //1.注册驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2.获得链接
            conn= DriverManager.getConnection("jdbc:mysql://localhost:3306/nanhang","root","123456");
            //3.获取操作数据库对象
            
            String sql="select pid,name,type from bulletin where pid=? and name=?";
            ps = conn.prepareStatement(sql);
            ps.setInt(1,11);
            ps.setString(2,"简报模板");
            //4.执行sql语句
            rs=ps.executeQuery();
            //5.处理结果集
            if(rs.next()){
                System.out.println(rs.getInt("pid")+","+rs.getString("name")+","+rs.getString("type"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            //6.释放资源
            if(rs!=null){
                try{
                    rs.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }

            if(ps!=null){
                try{
                    ps.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }

            if(conn!=null){
                try{
                    conn.close();
                }catch (Exception e){
                    e.printStackTrace();
                }
            }

        }
    }
}