triggers

问题 We are performing a database migration to SQL Server, and to support a legacy app we have defined views on the SQL Server table which present data as the legacy app expects. However, we're now having trouble with INSTEAD OF INSERT triggers defined on those views, when the fields may have default values. I'll try to give an example. A table in the database has 3 fields, a, b, and c. c is brand new, the legacy app doesn't know about it, so we also have a view with 2 fields, a and b. When the

问题 I am trying to figure out the best way to create a style/trigger to set foreground to Red, when value is < 0. what is the best way to do this? I'm assuming DataTrigger, but how can I check for negative value, do i have to create my own IValueConverter? 回答1: If you are not using an MVVM model (where you may have a ForegroundColor property), then the easiest thing to do is to create a new IValueConverter, binding your background to your value. In MyWindow.xaml: <Window ... xmlns:local="clr

问题 I have a simple question. Ive got a trigger to insert the values into another Database So for example if there are two values and the trigger is checking the value in Table A and inserting into Table B So here is the code -- Trigger DDL Statements USE `db`; DELIMITER // CREATE DEFINER=CURRENT_USER() TRIGGER `db`.`AFTER_INSERT_A` AFTER INSERT ON `db`.`a` FOR EACH ROW BEGIN IF NEW.val!= NULL THEN UPDATE b SET dateRemove=CURRENT_TIMESTAMP WHERE val=NEW.val; INSERT INTO b (val) VALUES(NEW.val) ON

问题 I have found numerous similar threads here, but none that seem to address my specific issue. I need to highlight the background of a textbox under certain conditions. I have created a Highlight property and tried using a trigger in a style to set it but it doesn't actually ever highlight the text. Here is my Style, simplified: <Style x:Key="TextBoxStyle" BasedOn="{StaticResource CommonStyles}"> <Style.Triggers> <Trigger Property="Elements:DataElement.Highlight" Value="True"> <Setter Property=

问题 I have a label that I only make visible based on one of my ViewModel Properties. Here is the XAML: <Label HorizontalAlignment="Center" VerticalAlignment="Center" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontSize="24" Width="200" Height="200" > <Label.Content > Option in the money! </Label.Content> <Label.Style> <Style TargetType="{x:Type Label}"> <Setter Property="Visibility" Value="Hidden" /> <Style.Triggers> <DataTrigger Binding="{Binding OptionInMoney}" Value=

问题 I'd like to disable a specific trigger on a table prior to inserting data into it, but without affecting other users that may be changing data in that same table. I can't find any documented way to do this. This is Oracle 11g. The best solution I've been able to come up with is to create a session variable and have my application set that to some value that the trigger checks for prior to doing its work. Obligatory anti-trigger comment: I hate triggers. 回答1: Add a variable to an existing

问题 Is it possible to create a Trigger that is triggered based on a ScrollViewer 's scroll bar visibility? I have a ScrollViewer with its VerticalScrollBarVisibility set to Auto and I want to change some of the ScrollViewer 's properties only when the scroll bar is actually visible. Something like this: <ScrollViewer VerticalScrollBarVisibility="Auto"> <ScrollViewer.Triggers> <Trigger Property="IsScrollBarVisible" Value="True"> <!-- Setters --> </Trigger> </ScrollViewer.Triggers> </ScrollViewer>

问题 I try to install "mysqludf_sys". But i got this error: ERROR 1126 (HY000) at line 29: Can't open shared library 'lib_mysqludf_sys.so' (errno: 0 /usr/lib/mysql/plugin/lib_mysqludf_sys.so: cannot open shared object file: No such file or directory) ERROR: unable to install the UDF So, i tried to solve it with the following mofification in Makefile: LIBDIR=/usr/lib to LIBDIR=/usr/lib/mysql/plugin Also make sure that gcc has the -fPIC option ie: gcc -fPIC -Wall -I/usr/include/mysql -I. -shared lib

问题 so i have these two tables: Table user columns: id,name,surname, password,token,earnedmoney Table addlisting columns: id, user_fk,price,date_added Here is my problem: I would like to create a trigger so that when I delete a listing from the table addlisting, the price of the listing gets added to the column "earnedmoney" which is in the table user. Could somebody help me? Thank you! 回答1: CREATE OR REPLACE FUNCTION add_money() RETURNS trigger AS $$BEGIN UPDATE "user" SET earnedmoney =

问题 I have an entity with a string property mapped to a nvarchar field in the DB. I use an after insert/update trigger to set the value of this field. By default EF will not load the value of this field after insert/update - only identity fields are reloaded from DB after insert. I've tried to change the StoreGeneratedPattern option on this field to Computed (which seems like the right way to do that) but I get the error: The store generated pattern 'Computed' is not supported for properties that