ASP.Net 鏈接多個數據庫之間的切換

本次兩個的兩個數據是SQL Server 和ORCAL

首先在Web.congfig中  

<connectionStrings> </connectionStrings>裏面添加兩個數據鏈接

在數據庫操做類中   寫兩個構造函數（一個是無參和有參的構造函數） 具體代碼以下

    DataAccess() {
            this.ConnectionSettings = ConfigurationManager.ConnectionStrings["FtpFileDownload"];
            //this.ConnectionSettings = StaticValue.ConnectionSettings;
            this.Factory = DbProviderFactories.GetFactory(this.ConnectionSettings.ProviderName);
        }
        public DataAccess(string ConnectionStringName)
        {
            this.ConnectionSettings = ConfigurationManager.ConnectionStrings[ConnectionStringName];
            //this.ConnectionSettings = StaticValue.ConnectionSettings;
            this.Factory = DbProviderFactories.GetFactory(this.ConnectionSettings.ProviderName);
        }

 

而後在調用就能夠了 具體代碼以下

            string sql1 = "select top 1 * from tableNAme ORDER BY Id DESC";//直接查詢數據庫的第一一條數據
            int prossed = DataAccess.Instance.ExecuteScalarGetInt(sql1);//直接查詢數據庫的最後一條數據
            MessageBox.Show(prossed + "         ");

            string BL_NO = "OERT202202I00438";
            DataAccess a= new DataAccess("SHA");
            string selectSQL = "SELECT COUNT(id) FROM tableNAme WHERE BL_NO = '" + id+ "'";
            int prosessed = a.ExecuteScalarGetInt(selectSQL);
             MessageBox.Show(prosessed + "         ");