if DB_ID('MyMusic') is not null
drop database MyMusic
go
create database MyMusic  --创建MyMusic（我的音乐）数据库
on
(
name=MyMusic,
filename='D:\CS架构\学习\窗体\DB\MyMusic.mdf'
)
--打开数据库
use MyMusic
--创建表歌曲
if OBJECT_ID('SongInformation') is not null
drop table SongInformation --歌曲信息表
go
create table SongInformation
(Songid int primary key identity(10000,1),  --编号SongName varchar(50) not null,   --歌名Singer varchar(50) not null,  --演唱者Album varchar(50)  --专辑
)
--查询表SongInformation
select *from SongInformation
--添加测试数据
insert SongInformation select '演员','薛之谦','绅士'union
select '尽头','赵方倩','音阙诗听'union
select '当你','王心凌','遇上爱'union
select '七里香','周杰伦','七里香'union
select '微微一笑很倾城','杨洋','微微一笑很倾城'union
select '岁月神偷','金玟岐','金玟岐作品集'union
select '带你去旅行','校长','带你去旅行'

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;using System.Data;
using System.Data.SqlClient;namespace 窗口
{public   class DBHelper{public static string ConStr = "server=.;uid=sa;pwd=sa;database=MyMusic";public  static SqlConnection con = null;#region 创建连接对象public  static SqlConnection GetConnection(){if (con == null || con.ConnectionString == ""){con = new SqlConnection(ConStr);}return con;} #endregion#region 打开连接public static void OpenConnection(){if (con.State == ConnectionState.Closed){con.Open();}}#endregion#region 关闭连接public static void CloseConnection(){if (con.State == ConnectionState.Open){con.Close();}}#endregion#region 查询多行多列的值public static SqlDataReader ExecuteReader(string sql,params SqlParameter [] para){SqlConnection con = GetConnection();OpenConnection();SqlCommand com = new SqlCommand(sql, con);com.Parameters.AddRange(para);SqlDataReader dr = com.ExecuteReader();return dr;}#endregion#region 动作查询public static int ExecuteNonQuery(string sql,params SqlParameter[] para){SqlConnection con = GetConnection();OpenConnection();SqlCommand com = new SqlCommand(sql, con);       com.Parameters.AddRange(para);int n = com.ExecuteNonQuery();CloseConnection();return n;}#endregion}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace 窗口
{public  class Song{public int Songid { get; set; }public string SongName { get; set; }public string Singer { get; set; }public string Album { get; set; }}
}

  #region 将后台信息加载到网格private void LoadDOV(string sql){if (sql == ""){sql = "select*from SongInformation";}SqlConnection con = new SqlConnection(DBHelper.ConStr);SqlDataAdapter sda = new SqlDataAdapter(sql, con);DataTable dt = new DataTable();sda.Fill(dt);dgvSong.DataSource = dt;}#endregion#region 窗体加载事件方法private void FrmMain_Load(object sender, EventArgs e){LoadDOV("");}#endregion

View Code

 #region 查询事件方法private void btnQuery_Click(object sender, EventArgs e){string sql = "select*from SongInformation where 1=1";if (txtSongName.Text != ""){sql += "and SongName like '%" + txtSongName.Text + "%'";}if (txtSinger.Text != ""){sql += "and Singer like '%" + txtSinger.Text + "%'";}LoadDOV(sql);}#endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;using System.Data.SqlClient;namespace 窗口
{public class SongManage{//传参public static List<Song> SelectCarsAll(){List<Song> song = new List<Song>();string sql = "select*from SongInformation";SqlDataReader dr = DBHelper.ExecuteReader(sql);while (dr.Read()){Song songs = new Song();songs.Songid = Convert.ToInt32(dr["Songid"]);songs.SongName = Convert.ToString(dr["SongName"]);songs.Singer = Convert.ToString(dr["Singer"]);songs.Album = Convert.ToString(dr["Album"]);song.Add(songs);}dr.Close();DBHelper.CloseConnection();return song;}//修改public static Song SelectCarsByCarId(int Songid){Song song = null;string sql = "select * from SongInformation where Songid=" + Songid;SqlDataReader dr = DBHelper.ExecuteReader(sql);if (dr.Read()){song = new Song();song.Songid = Convert.ToInt32(dr["Songid"]);song.SongName = Convert.ToString(dr["SongName"]);song.Singer = Convert.ToString(dr["Singer"]);song.Album = Convert.ToString(dr["Album"]);}dr.Close();DBHelper.CloseConnection();return song;}//添加public static int InsertSong(Song song){string sql = string.Format("insert  SongInformation (SongName,Singer,Album) values('{0}','{1}','{2}')", song.SongName, song.Singer, song.Album);return DBHelper.ExecuteNonQuery(sql);}//更新public static int UpdateSong(Song song){string sql = "update SongInformation set SongName=@SongName,Singer=@Singer,Album=@Album where Songid=@Songid";return DBHelper.ExecuteNonQuery(sql,new SqlParameter[] {new SqlParameter("@SongName",song.SongName),new SqlParameter("@Singer",song.Singer),new SqlParameter("@Album",song.Album),new SqlParameter("@SongId",song.Songid),});}}
}

View Code

  #region 修改/// <summary>/// 修改事件方法/// </summary>private void TsmModify_Click(object sender, EventArgs e){if (dgvSong.SelectedRows.Count > 0){int Songid = (int)dgvSong.SelectedRows[0].Cells["Songid"].Value;FrmModifySong frm = new FrmModifySong();frm.Songid = Songid;frm.ShowDialog();}}#endregion#region 添加事件方法private void tsmAdd_Click(object sender, EventArgs e){FrmModifySong frm = new FrmModifySong();          frm.Show();} #endregion

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 窗口
{public partial class FrmModifySong : Form{public int Songid { get; set; }private string type = "添加";public FrmModifySong(){InitializeComponent();}#region 取消按钮事件方法private void btnCancel_Click(object sender, EventArgs e){this.Close();}#endregion#region 保存按钮事件方法private void btnSave_Click(object sender, EventArgs e){Song song = new Song{    SongName=txtSongName.Text,Singer=txtSinger.Text,Album=txtAlbum.Text            };int n = 0;if (type == "添加"){n = SongManage.InsertSong(song);}else{song.Songid = Songid;n = SongManage.UpdateSong(song);}if (n > 0){MessageBox.Show(type + "成功！");}else{MessageBox.Show(type + "失败！");}}#endregionprivate void FrmModifySong_Load(object sender, EventArgs e){if (Songid != 0){type = "修改";txtSongid.ReadOnly = true;Song song = SongManage.SelectCarsByCarId(Songid);if (song != null){txtSongid.Text = song.Songid.ToString();txtSongName.Text = song.SongName;txtSinger.Text = song.Singer;txtAlbum.Text = song.Album;}this.Text = "修改歌曲信息";}else{txtSongid.ReadOnly = false;this.Text = "添加歌曲信息";}}}
}

View Code

  #region 删除事件方法//删除事件方法private void TsmDelete_Click(object sender, EventArgs e){int Songid = (int)dgvSong.SelectedRows[0].Cells[0].Value;string sql = "delete SongInformation  where SongId=" + Songid;int n = DBHelper.ExecuteNonQuery(sql);if (n > 0){MessageBox.Show("删除成功", "删除提示");LoadDOV("");}else{MessageBox.Show("删除失败", "删除提示");}} #endregion