Core 项目下使用SQl语句

       public static DataTable ExeQuery(string connectionString, CommandType cmdType, string cmdText)
         {
             using (var conn = new SqlConnection(connectionString))
             {
                 var mydt = new DataTable();
                 conn.Open();
                 var cmd = conn.CreateCommand();
                 cmd.CommandType = cmdType;
                 cmd.CommandText = cmdText;
                 var adp = new SqlDataAdapter(cmd);
                 adp.Fill(mydt);
                 return mydt;
             }
         }

         public static async Task<DataTable> ExeQueryAsync(string connectionString, CommandType cmdType, string cmdText)
         {
             using (var conn = new SqlConnection(connectionString))
             {
                 var mydt = new DataTable();
                 await conn.OpenAsync();
                 var cmd = conn.CreateCommand();
                 cmd.CommandType = cmdType;
                 cmd.CommandText = cmdText;
                 var adp = new SqlDataAdapter(cmd);
                 adp.Fill(mydt);
                 return mydt;
             }
         }

  private string GetId(string LOCATION, string OPERATING_UNIT)
         {
             using (var db = new OMSData.ACC_MINIEHUBContext())
             {
                 string cmd = string.Format("select ww from wTES where LOCATION = '{0}' and OIT = '{1}'", LOCATION, OPERATING_UNIT);
                 var mytb = fn.fnSQL.ExeQuery(db.ACC_Context.ConnectionString, CommandType.Text, cmd);
                 var CUST_ACCOUNT_ID = mytb.Rows[]["CUST_ID"].ToString();
                 return CUST_ACCOUNT_ID;
             }
         }

   cmd = string.Format("select DeptName from [V_ACC_USER] where EMPID = '{0}'", WorkId);
                 mytb = Asus.fn.fnSQL.ExeQuery(db.Context.ConnectionString, CommandType.Text, cmd);
                 string DeptName = "Err";
                 if (mytb.Rows.Count > 0)
                 {
                     DeptName = mytb.Rows[]["Name"].ToString();
                     DeptName = DeptName.Substring(DeptName.LastIndexOf('-') + );
                 }