Question

试图了解ASP.NET DAL和TableAdapter，我希望有人可以在使用SQL查询参数时帮助我获取列数据。

如果我有一个带有返回一行或多行的查询的TableAdapter，我可以从数据表中获取行和列数据没问题。对于返回一行的简单查询，我可以使用：

SQL: SELECT firstName, lastName from Names WHERE ID=1

Dim MyAdapter1 As New ProjectTableAdapters.NamesTableAdapter1
Dim f As String = MyAdapter1.GetNames.Rows(0)("firstName")
Dim l As String = MyAdapter1.GetNames.Rows(0)("lastName")

但是如果使用带有参数查询的TableAdapter，我会不断抛出异常。我确信这很简单，如果有人可以指出我正确的方向（如果可能的话，vb）。非常感谢。

SQL: SELECT firstName, lastName from Names WHERE ID=@ID

Dim ID As Integer = 1
Dim MyAdapter2 As New ProjectTableAdapters.NamesTableAdapter2
Dim f As String = MyAdapter2.GetNames(Rows(0)("firstName"),ID)   [throws exection]

编辑：我想我现在有效 - 我的语法不好......

Dim f As String = MyAdapter2.GetNames(ID).Rows(0)("firstName")

Answer 1

Public Function MyFunction() As DataSet
        Dim conString As String = "Connection String"
        Dim conn As New SqlConnection(conString)
        Dim da As New SqlDataAdapter()
        Dim cmd As New SqlCommand With {
            .Connection = conn,
            .CommandText = "SELECT firstName, lastName from Names WHERE ID=@ID",
            .CommandType = CommandType.Text}
        cmd.Parameters.Add("@ID", SqlDbType.Int).Value = 1
        da.SelectCommand = cmd
        Dim ds As DataSet = New DataSet()
        conn.Open()
        da.Fill(ds)
        conn.Close()
        Return ds
    End Function

ASP TableAdapters。从SQL参数查询中获取行数据

1 个答案: