数据层

Question

我使用了三层架构 System.IndexOutOfRangeException：在这里输入代码位置1没有行。这里我粘贴我的代码

数据层

数据访问层

 public DataSet getRecordDisplay(int product_id,int category_id)
            {
                string constring = string.Empty;

                SqlConnection conn;


                constring = ConfigurationManager.ConnectionStrings["MyConnection"].ConnectionString;
                conn = new SqlConnection(constring);
                conn.Open();
                SqlCommand cmd = new SqlCommand("sp_Productselect", conn);
                cmd.CommandText = "sp_Productselect";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@product_id", DbType.Int32).Value = product_id;
                cmd.Parameters.AddWithValue("@category_id", DbType.Int32).Value = category_id;
                SqlDataAdapter adpt = new SqlDataAdapter(cmd);
                DataSet dst = new DataSet();
                adpt.Fill(dst);
                return dst;

            }

#Business logic

业务逻辑层包含在这里

 public DataSet getRecordDisplay(int product_id,int category_id)
        {
            DataSet ds = new DataSet();
            ds = dal.getRecordDisplay(product_id,category_id);
            return ds;
        }

# code behind


     int product_id = Convert.ToInt32(txtPId.Text);
                int category_id = Convert.ToInt32(txtctid.Text);
                DataSet dsOrderDetail = new DataSet();


                        dsOrderDetail = bal.getRecordDisplay(product_id, category_id);
                    lblProdName.Text = dsOrderDetail.Tables[0].Rows[0]["Product_Name"].ToString() + "<br/>";
                    lblProdId.Text = dsOrderDetail.Tables[0].Rows[1]["Product_Id"].ToString() + "<br/>";
                    lblProdDesc.Text = dsOrderDetail.Tables[0].Rows[2]["Description"].ToString() + "<br/>";
                    lblCtyId.Text = dsOrderDetail.Tables[0].Rows[3]["Category_id"].ToString() + "<br/>";
                    lblPrice.Text = dsOrderDetail.Tables[0].Rows[4]["Price"].ToString() + "<br/>";
                    lblAblty.Text = dsOrderDetail.Tables[0].Rows[5]["Availability"].ToString() + "<br/>";

#my stored procedure


stored procedure is added here
        GO
            CREATE PROCEDURE [dbo].[sp_Productselect] 
            @product_id as int,
            @category_id as  int
        AS
        BEGIN

            SELECT * FROM product04 where   product_id=345 and category_id=2346
        END

        GO

Answer 1

您还需要检查查询是否返回数据，您将面临问题，因为您正在尝试访问不存在的数据行数据。我希望你明白我的观点。

 dsOrderDetail = bal.getRecordDisplay(product_id, category_id);

if(dsOrderDetail !=null && dsOrderDetail.Table.Count > 0 && dsOrderDetail.Table.Rows.Count >0)
{
     lblProdName.Text = dsOrderDetail.Tables[0].Rows[0]["Product_Name"].ToString() + "<br/>";
     lblProdId.Text = dsOrderDetail.Tables[0].Rows[1]["Product_Id"].ToString() + "<br/>";
     lblProdDesc.Text = dsOrderDetail.Tables[0].Rows[2]["Description"].ToString() + "<br/>";
     lblCtyId.Text = dsOrderDetail.Tables[0].Rows[3]["Category_id"].ToString() + "<br/>";
     lblPrice.Text = dsOrderDetail.Tables[0].Rows[4]["Price"].ToString() + "<br/>";
     lblAblty.Text = dsOrderDetail.Tables[0].Rows[5]["Availability"].ToString() + "<br/>";
}

存储过程存在问题

SELECT * FROM product04 where   product_id=345 and category_id=2346

而不是这行查询，它应该是

  CREATE PROCEDURE [dbo].[sp_Productselect] 
        @product_id as int,
        @category_id as  int
    AS
    BEGIN

        SELECT * FROM product04 where   product_id=@product_id and category_id=@category_id 
    END

    GO

你的代码中还有其他东西，你应该使用＆＃34;使用＆＃34;连接处理它。

 public DataSet getRecordDisplay(int product_id,int category_id)
{
 ...
  using( SqlConnection con = new SqlConnection(connectionstring))
  {
  }
 ...
}

请告诉我我在哪里纠正它：

数据层

1 个答案: