Question

一周和4天的C＃经验，请耐心等待。
我被分配了构建一个将信息存储到连接数据库的webform的任务。我创建了一个数据访问层类，我想连接一个人选择编辑/创建新条目后将显示的代码。

我希望DAL做3件事：

View它将更新的表格
在表中添加记录，即insert
Update上一个条目中的字段

以下是我到目前为止的代码：

public class AccountTrackerDAL
{ #region View ConnectionType()
  public DataTable ViewConnectionType()
   {  
      var sqlStatement = new StringBuilder();

      sqlStatement.Append(" SELECT");
      sqlStatement.Append(" ConnectionTypeID, ConnectionTypeDesc, CreatedBy, CreatedDate, LastUpdatedBy, LastUpdatedDate");
      sqlStatement.Append("  FROM");
      sqlStatement.Append("  dbo.ConnectionType");
      sqlStatement.Append("  ORDER BY");
      sqlStatement.Append("  ConnectionTypeDes");

       SqlCommand sqlCmd = new SqlCommand(sqlStatement.ToString());
       return DBAccess.SQLServer.GetDataTable(DBAccess.SQLServer.GetConnectionString("AccountTrackerDB",sqlCmd);
   }#endregion // This code has no errors and does what I want.

    #region View ConnectionType by Id

      public DataTable ViewConnectionTypeByID(int connectionTypeID)
      { var sqlStatement = new StringBuilder();

        sqlStatement.Append(" SELECT");
        sqlStatement.Append("   ConnectionTypeID, ConnectionTypeDesc, Created By, CreatedDate, LastUpdatedBy, LastUpdatedDate");
        sqlStatement.Append(" FROM");
        sqlStatement.Append( "   dbo.ConnectionType");
        sqlStatement.Append("  WHERE");
        sqlStatement.Append(" ConnectionTypeID = @ConnectionTypeID");

        SqlCommand sqlCommand = new SqlCommand(sqlStatement.ToString());
        sqlCommand.Parameters.Add("@ConnectionTypeID", SqlDbType.Int);
        sqlCommand.Parameters["@ConnectionTypeID"].Value = connectionTypeID;

        return DBAccess.SQLServer.GetDataTable(DBAccess.SQLServer.GetConnectionSTring("AccountTracker"),sqlCommand);
      }#endregion // this code also functions as i need it to, according to //my boss. Although I don't understand it.

#region Insert ConnectionType by Id /* I need this method to pass a value when the user chooses to not a hard coded value. In other words i just need to pass a place holder. Here is where i don't know what to pass */
       public DataTable UpdateConnectionTypeById(int connectionTypeID)
       { var sqlStatement = new StringBuilder();

         sqlStatement.Append("INSERT INTO");
         sqlStatement.Append("  ConnectionType"); 
         sqlStatement.Append(" WHERE");
         sqlStatement.Append(" ConnecitonTypeID = @ConnectionID"); 

         SqlCommand sqlCommand = new SqlCommand(sqlStatement.ToString());
         sqlCommand.Parameters.Add("@ConnectionTypeid"), SqlDbType.Int);
         sqlCommand.Parameters[@ConnectionTypeid].Value = connectionTypeID;

         return DBAccess.SQLServer.GetDataTable(DBAccess.SQLServer.GetConnectionString("AccounTracker"),sqlCommand);
       }#endregion

}

我会尽力回答任何人可能提出的问题。感谢。

实现数据访问层并连接到数据库？

0 个答案: