Question

我已经研究过，但无法找到问题的答案。我的目标是在SSRS中使用#!/usr/bin/env python3 import gi gi.require_version('Gtk', '3.0') from gi.repository import Gtk from gi.repository import Gdk from gi.repository import GdkPixbuf # from wikipedia my_xpm = [ "24 20 3 1 12 10 XPMEXT", " c None", ". c #0000FF", "+ c #FF0000", " ", " .. ", " .... ", " ......++++++++ ", " .........+++++++ ", " ..........+++++++ ", " ............++++++ ", " .............++++++ ", " ..............++++ ", " +.............+++ ", " ++.............++ ", " +++.............+ ", " +++++............. ", " ++++++.............. ", " ++++++++............ ", " +++++++++........... ", " +++++++++......... ", " ++++++++++....... ", " ++++++++++..... ", " +++++++++ ... " ] class MainWindow(Gtk.Window): def __init__(self): Gtk.Window.__init__(self, title="TreeView Drag and Drop") self.connect("delete-event", Gtk.main_quit) self.box = Gtk.Box() self.add(self.box) # "model" with dummy data self.store = Gtk.TreeStore(str) for i in range(5): self.store.append(None, ['Item {}'.format(i)]) # treeview self.tree = Gtk.TreeView(model=self.store) self.box.pack_start(self.tree, True, True, 0) # build columsn colA = Gtk.TreeViewColumn('Col A', Gtk.CellRendererText(), text=0) self.tree.append_column(colA) # icon view self._icon = GdkPixbuf.Pixbuf.new_from_xpm_data(my_xpm) self.image = Gtk.Image.new_from_pixbuf(self._icon) self.box.pack_start(self.image, True, True, 0) # DnD events self.tree.connect("drag-data-received", self.drag_data_received) self.tree.connect("drag-data-get", self.drag_data_get) #self.tree.connect("drag-begin", self.drag_begin) self.tree.connect_after("drag-begin", self.drag_begin) target_entry = Gtk.TargetEntry.new('text/plain', 2, 0) self.tree.enable_model_drag_source( Gdk.ModifierType.BUTTON1_MASK,[target_entry], Gdk.DragAction.DEFAULT|Gdk.DragAction.MOVE ) self.tree.enable_model_drag_dest( [target_entry], Gdk.DragAction.DEFAULT|Gdk.DragAction.MOVE ) def drag_data_get (self, treeview, drag_context, data, info, time): model, path = treeview.get_selection().get_selected_rows() print('dd-get\tpath: {}'.format(path)) data.set_text(str(path[0]), -1) def drag_data_received (self, treeview, drag_context, x,y, data,info, time): print('dd-received') store = treeview.get_model() source_iter = store.get_iter(data.get_text()) dest_path, drop_pos = self.tree.get_dest_row_at_pos(x, y) print('path: {} pos: {}'.format(dest_path, drop_pos)) def drag_begin(self, widget, context): self._drag_icon = GdkPixbuf.Pixbuf.new_from_xpm_data(my_xpm) widget.drag_source_set_icon_pixbuf(self._drag_icon) return context win = MainWindow() win.show_all() Gtk.main()函数，该函数目前正在按预期执行。但是，我有不存在的空值，我将其表示为“ 0”。看来我应该能够将Lookup表达式与Lookup函数一起使用。但是，我找不到这样的例子。有什么想法我可以做到这一点吗？我的IIF表达式如下。

Lookup

Answer 1

我将使用IsNothing函数检查该值是否为Null并将其包装在IIF表达式中。这是用于不同表达式的Microsoft reference。

=IIF
(
  IsNothing(LookUp(Fields!SKU.Value, Fields!ItemCode.Value, Fields!Store.Value, "DataSet3"))
, 0
, LookUp(Fields!SKU.Value, Fields!ItemCode.Value, Fields!Store.Value, "DataSet3")
)

如何在SSRS中使用Lookup表达式和IIF表达式？

1 个答案: