從SQL Server抓取給定行中某一列中一個單元格的值的數據行-Visual Basic

Question

我檢查了值是否存在

Dim connectionString = [connection string ]

Using exist As New SqlConnection(connectionString)
    Dim cmd As SqlCommand = New SqlCommand("SELECT * FROM Employees WHERE WorkEmail = @WorkEmail", exist)
    cmd.Parameters.AddWithValue("@WorkEmail", DataObjects.Contacts.ElectronicAddress.Email)

    If cmd.ExecuteScalar > 0 Then
        //return row so that I can grab values from it, given column names

我將如何在最后一行進行注釋部分？

Answer 1

您應該執行命令，然后檢查它是否返回任何行。

請參閱使用數據讀取器檢索數據

摘錄針對您的用例進行了微調：

Private Sub HasRows(ByVal connection As SqlConnection)
    Using connection
        Using cmd As SqlCommand = New SqlCommand("SELECT * FROM Employees WHERE WorkEmail = @WorkEmail", connection)
            cmd.Parameters.AddWithValue("@WorkEmail", DataObjects.Contacts.ElectronicAddress.Email)
            connection.Open()

            Using reader As SqlDataReader = cmd.ExecuteReader()
                While reader.Read()
                    REM Your code to pull the data you want from the returned data goes here
                End While
            End Using
        End Using
    End Using
End Sub

將來，請嘗試瀏覽Microsoft文檔。 通常，您會在那里找到所需的東西。