我在Windows服务中使用2个线程(来自同一个类)。我总是得到同样的错误消息: "The SqlParameter is already contained by another SqlParameterCollection.
at System.Data.SqlClient.SqlParameterCollection.Validate(Int32 index, Object val
当添加参数到一个SqlCommand,有包括“参数名”,“类型和‘值’否则我最终写入像一个过载: using cmd as new SQLCommand("SELECT x FROM y WHERE z = @z", cn)
Dim p0 as SQLParameter = cmd.Parameters.Add("@z", SQLDbType.Int)
p0.Value = 1
Dim txtFName As TextBox = CType(Wizard1.FindControl("txtFName"), TextBox)
Dim txtLName As TextBox = CType(Wizard1.FindControl("txtLName"), TextBox)
Dim MyDbConnection As New SqlConnection(Configura
有多个值,我想运行使用ADO.Net的SqlClient风格@name参数与此类似 SELECT * FROM CatalogueItems WHERE id IN (1,10,15,20);
一个SQL SELECT语句。我已经使用存储在SQL字符串 SELECT * FROM CatalogueItems WHERE id IN (@Ids)
,然后在我的C#代码 SqliteComm
我曾经有过这样一个 Dt = MyMod.GetDataTable("SELECT TOP " & QuestionsPerCats(i) & " * From Questions WHERE CategoriesID ='" & Cats(i) & "' ORDER BY NEWID()")
,但现在我决定使用sqlparameters像 Dim cmd As New SqlCommand(