使用SQLDataAdapter查询动态列名称

问题描述：

我想动态更改基于查询字符串的SQLDataAdapter中的查询。我尝试将它作为参数传递，但这不起作用。还有其他建议吗？使用SQLDataAdapter查询动态列名称

现在我有：

Dim conn As Data.SqlClient.SqlConnection = New Data.SqlClient.SqlConnection(WebConfigurationManager.ConnectionStrings("MyConnection").ToString()) 

    Dim ad As New SqlDataAdapter 
    Dim selectSQL As String = "SELECT BookTitle, Publisher, Location, CallNumber, [Extra_Description] AS Description, [ISBN] FROM [New_Book_Table] WHERE [Export_to_list]='True' AND [@Category]='True'" 
    Dim selectCMD As SqlCommand = New SqlCommand(selectSQL, conn) 
    ad.SelectCommand = selectCMD 
    selectCMD.Parameters.Add("@Category", SqlDbType.NVarChar, 30).Value = getCategoryString() 
    Dim ds As New DataSet 

    ad.Fill(ds) 
    ListView1.DataSource = ds 
    ListView1.DataBind()

但得到的错误：System.Data.SqlClient.SqlException: Invalid column name '@Category'.

我猜是因为这是不是这样做的正确方法。我怎样才能做到这一点？我可以通过查询字符串获得列名。我想将该列名称传入查询并将其识别为列。

答

好吧，我想通了这一点，这是一个比试图动态添加参数，由于初始SelectSQL只是一个字符串更容易的方法，我动态构造该字符串机智以下功能：

Protected Function getSQLQuery() As String 
    Dim baseQuery As String = "SELECT BookTitle, Publisher, Location, CallNumber, [Extra_Description] AS Description, [ISBN] FROM [New_Book_Table] WHERE [Export_to_list]='True'" 
    Dim category As String = getCategoryString() 
    Return baseQuery & "AND [" & category & "]='True'" 
End Function

使用SQLDataAdapter查询动态列名称

相关推荐