C#機房重構-查看上機記錄

【前言】

上一篇博客介紹瞭如何使用DataGridView控件綁定數據源顯示數據。下面介紹另一種方法，不需要給DataGirdView控件綁定數據源，直接通過代碼將數據顯示到DataGirdView表格當中。

【界面設計】

 

用戶直接使用卡號登錄，在查詢上機記錄的時候也只能查詢自己的，不能查詢別人的，所有我直接用lable顯示當前用的登錄的卡號。 

【代碼實現】

Factory層

    public class LineInfoFactory
    {
        //獲取配置文件
        string strDB = System.Configuration.ConfigurationManager.AppSettings["DB"];
        public ILineInfo lineInfo()
        {
            string className = strDB + "." + "LineInfoDAL";
            ILineInfo idal= (ILineInfo)Assembly.Load(strDB).CreateInstance(className);
            return idal;
        }
    }

 IDAL層

    public interface ILineInfo
    {
        //查詢上機記錄
        DataTable queryLineInfo(string cardNo);
    }

DAL層

 public class LineInfoDAL : ILineInfo
    {
        //實例化SqlHelper類
        SqlHelper sqlHelper = new SqlHelper();

        //查詢上機記錄
        public DataTable queryLineInfo(string cardNo)
        {
            SqlParameter[] sqlParams =
            {
                new SqlParameter("@cardno",cardNo),
            };
            string sqlQuery = @"select cardno,ondatetime,offdatetime,consumetime,consumecash,status,computer from [Line_Info] where cardno=@cardNo and status='已下機'";
            DataTable table = sqlHelper.ExecuteQuery(sqlQuery, sqlParams, CommandType.Text);
            return table;
        }
    }

BLL層

 public class LineInfoBLL
    {
        //查詢上機記錄
        public DataTable queryLineInfo(string cardNo)
        {
            //實例化一個工廠層
            LineInfoFactory lineFact = new LineInfoFactory();
            //接收工廠層返回的接口
            ILineInfo idal= lineFact.lineInfo();
            DataTable table= idal.queryLineInfo(cardNo);
            return table;
        }
    }

Facade層

    public class LineInfoFacade
    {
        //查看上機記錄
        public DataTable queryLineInfo(string cardNo)
        {
            //實例化B層
            LineInfoBLL lineBll = new LineInfoBLL();
            DataTable table= lineBll.queryLineInfo(cardNo);
            return table;
        }
    }

UI層

private void btnQuery_Click(object sender, EventArgs e)
        {
            string cardNo = lblCardNo.Text.Trim();
            //實例化外觀層
            LineInfoFacade lineFac = new LineInfoFacade();
            //接收外觀層傳過來的值
            DataTable table = lineFac.queryLineInfo(cardNo);
            int j = table.Rows.Count;
            if (table.Rows.Count > 0)
            {
                //指定DataGridView控件的行數
                dataGridView1.RowCount = j;
                int i = 0;
                while (i < j)
                {
                    dataGridView1.Rows[i].Cells[0].Value = table.Rows[i][0];
                    dataGridView1.Rows[i].Cells[1].Value = table.Rows[i][1];
                    dataGridView1.Rows[i].Cells[2].Value = table.Rows[i][2];
                    dataGridView1.Rows[i].Cells[3].Value = table.Rows[i][3];
                    dataGridView1.Rows[i].Cells[4].Value = table.Rows[i][4];
                    dataGridView1.Rows[i].Cells[5].Value = table.Rows[i][5];
                    dataGridView1.Rows[i].Cells[6].Value = table.Rows[i][6];
                    i++;
                }
            }
            else
            {
                MessageBox.Show("沒有查詢到上機記錄!");
            }
        }