通过 Visual Studio 在 SQL Server 中更新 UsageTime

Question

我想在时间每分钟滴答时更新UsageTime，但无法获得正确的代码。

Private Sub LBLTime_TextChanged(sender As Object, e As EventArgs) Handles LBLTime.TextChanged

    con.ConnectionString = My.Settings.Finals_DBConnectionString
    cmd.Connection = con
    con.Close()
    con.Open()
    cmd.CommandText = "update tbl_transaction set usagetime = @ut, remainingtime = @rt"
    cmd.Parameters.Clear()
    cmd.Parameters.AddWithValue("ut", +1)
    cmd.Parameters.AddWithValue("rt", -1)
    cmd.Parameters cmd.ExecuteNonQuery()
    End With
End Sub

Answer 1

试试这个。

update tbl_transaction set usagetime = usagetime+1 , remainingtime = remainingtime -1 

在您的 sql 中也看不到任何“位置”。这不是一个好习惯