免費錄播jdbc視訊

程式碼

package net.mmr.jdbc.t1;

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

import net.mmr.jdbc.t1.util.JdbcUtil;

import org.junit.Test;

public class TestCURD {

    //刪除
    @Test
    public void delete() throws Exception{

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

        Connection conn = DriverManager.getConnection("jdbc:mysql:///mmr", "root", "1234");

        Statement st  = conn.createStatement();

        String sql = "delete from users where id = 'u004'";

        int r = st.executeUpdate(sql);

        System.out.println(r);

        st.close();
        conn.close();

    }


    //更新
 

    @Test
    public void update() throws Exception{

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

        Connection conn = DriverManager.getConnection("jdbc:mysql:///mmr", "root", "1234");

        Statement st = conn.createStatement();

        String sql = "update users set password = '456' where id = 'u004'"
 
;

        int r = st.executeUpdate(sql);

        System.out.println(r);

        st.close();
        conn.close();


    }

    //錄入
    @Test
    public void create() throws Exception{

        //1 註冊驅動
        Class.forName("com.mysql.jdbc.Driver");
        //2獲得連結
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mmr", "root", "1234");
        //3獲得語句執行者
        Statement st = conn.createStatement();
        // 準備sql
        String sql = "insert into users(id,username,password) values('u004','feng','123')";
        //4執行sql
        int r = st.executeUpdate(sql);

        //5處理結果
        System.out.println(r);

        //6釋放資源
        st.close();
        conn.close();
    }
}