Question

我正在创建一个＆＃34;相关项目＆＃34;在线商店的功能。我有一个SQL查询，它将从数据库中提取ITEM列表并在页面上显示它们，但我正在尝试装配系统，其中列表将根据一些变量而改变。

代码如下，我遇到问题的部分是从Query1中获取一个可用的字符串，用作＆＃39;结果＆＃39;查询中的变量2。

Public Shared Function GetExtraProducts(ByVal strAddOnCat As String) As DataSet
    Dim connect As New SqlConnection

    Dim Data1 As New DataSet
    Dim data2 As New DataSet
    connect.ConnectionString = "SERVER = SERVER-SQL01; Trusted_Connection=yes; DATABASE=GlobalPCSQL"
    connect.Open()

    Dim query1 As String = ""
    Dim query2 As String = ""
    query1 = "SELECT StockID FROM dbo.ADDONLISTS WHERE SubCategory = 'Acer-Desktops'"

    Dim command1 = New SqlDataAdapter(query1, connect)
    command1.Fill(Data1)

    If Data1.Tables(0).Rows.Count > 0 Then
        query1 = "SELECT StockID FROM dbo.ADDONLISTS WHERE SubCategory = 'Generic'"
        Dim command3 = New SqlDataAdapter(query1, connect)
        command3.Fill(Data1, "StockID")
    End If

    Dim results As String = ""
    For Each row In Data1.Tables(0).Rows

        results += row.ToString() + "','"
    Next
    If results.Length > 2 Then
        results = results.Substring(0, results.Length - 2)
    End If




    'results = "'HD12047' , 'TV12008'"

    query2 = "SELECT stock_items.Stockcode, STOCK_GROUPS.XW_URL as stockgroup, STOCK_GROUP2S.XW_URL as stockgroup2, STOCK_MAINGROUP.XW_URL as stockmaingroup, stock_items.Stockcode as pID, stock_items.description as pName, stock_web.sales_html as pdescription, stock_web.picture_url as pImage, stock_web.picture_url as pLargeimage, stock_items.sellprice1 as pPrice, stock_items.SELLPRICE1, stock_items.SELLPRICE2, stock_items.SELLPRICE3, stock_items.SELLPRICE4, stock_items.SELLPRICE5, stock_items.SELLPRICE6, stock_items.SELLPRICE7, stock_items.SELLPRICE8, stock_items.SELLPRICE9, stock_items.status as itemtype, stock_items.SELLPRICE10 as pListPrice, stock_items.x_totalstock as pInStock, stock_items.x_webhits as pHits, stock_items.ISACTIVE, stock_items.WEB_SHOW, stock_items.X_WebBlub as X_WebBlurb, stock_items.x_webpromo as X_PROMOPAGE, stock_items.last_updated as lastupdated, stock_items.x_stockleveloverride, isnull(stock_items.Restricted_item,'N') as Restricted_item "
    query2 += "FROM stock_items Left OUTER Join STOCK_WEB ON (stock_items.Stockcode = STOCK_WEB.Stockcode) LEFT OUTER JOIN STOCK_GROUPS ON (STOCK_GROUPS.GROUPNO = STOCK_ITEMS.STOCKGROUP) LEFT OUTER JOIN STOCK_GROUP2S ON (STOCK_GROUP2S.GROUPNO = STOCK_ITEMS.STOCKGROUP2) LEFT OUTER JOIN STOCK_MAINGROUP ON (STOCK_MAINGROUP.GROUPNO = STOCK_GROUPS.XW_MAINGROUP)"
    query2 += "WHERE stock_items.ISACTIVE='Y'  AND stock_web.picture_url IS NOT NULL "
    query2 += "AND stock_items.Stockcode IN ('" + results + "')"


    query2 += results


    Dim command2 = New SqlDataAdapter(query2, connect)
    command2.Fill(data2)
    connect.Close()


    Return data2

End Function

如果我将库存ID号码输入查询2（代替＆＃39; +结果+＆＃39;部分，但是当我尝试使用查询中的字符串时，我得到的全部内容都可以正常工作

Incorrect syntax near 'System.Data.DataRow'

这让我觉得即使我对语法进行了排序，它也只会搜索System.Data.Datarow而不是字段的实际值。

任何帮助都将不胜感激。

Answer 1

DataRow可以包含许多DataColumn个。即使您的返回DataRow仅包含一个DataColumn，您仍必须指定DataColumn：

Dim results As String = ""
For Each row In Data1.Tables(0).Rows

    results += row.Item(0).ToString() + "','" '<--- Added Item(0)'
Next
If results.Length > 2 Then
    results = results.Substring(0, results.Length - 2)
End If

另外，仔细检查第一个结果是否有撇号。您可能需要：

Dim results As String = "'"

最后，在不相关的说明中，虽然+运算符可用于字符串连接，但我建议您使用&运算符，仅使用+进行数字加法：

results &= row.Item(0).ToString() & "','" '<--- Added Item(0)'

将DataAdapter结果用作新查询的字符串

1 个答案: