triggers

问题 this is my code: <Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <ListBox ItemsSource="{Binding Persons}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Template"> <Setter.Value> <ControlTemplate> <Border Background="White" BorderThickness="5" Name="Bd"> <Border.Style> <Style TargetType=

问题 everyone. I've a LOG table with a combination of trigger and sequence to create the id, so when I insert the line I do not have to specify the id, otherwise the database returns error. However Hibernate claims (rightly) that was specified primary key. What kind of "generator" property should I use in this case? I already tried " assigned " it says: org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save (): it.m2sc.simulator.beans.Log

问题 There is a folder in which xml files are beeing copied at no particular time, when an event is happening. I want a php way to inspect the folder's status and when an xml file arrives, an event will be triggered.(ex.call to the xml parser). So which is the best way (in php) to monitor a folder and trigger events according to it's status? Thanx! 回答1: Haven't tried it, but maybe Inotify can help you: inotify is a Linux kernel subsystem that acts to extend filesystems to notice changes to the

问题 I am using some SQL triggers to launch actions when a table row gets modified or created. That works like a charm and in my example sets the column gen_date to the current date/time: CREATE TRIGGER insert_template BEFORE INSERT ON template FOR EACH ROW BEGIN SET new.gen_date := now(); END; I have another column image and I would like to add a column image_date which should have the value of the current time/date when that field gets updated. Question: Is it possible to set up a trigger that

问题 I am using some SQL triggers to launch actions when a table row gets modified or created. That works like a charm and in my example sets the column gen_date to the current date/time: CREATE TRIGGER insert_template BEFORE INSERT ON template FOR EACH ROW BEGIN SET new.gen_date := now(); END; I have another column image and I would like to add a column image_date which should have the value of the current time/date when that field gets updated. Question: Is it possible to set up a trigger that

问题 I have 3-4 tables in my database which I want to track the changes for. I am mainly concerned about updates. Whenever updates happen, I want to store previous entry (value or complete row) in audit table. Basic columns I was thinking of are as following: AuditId, TableName, PK1, PK2, PK3, PKVal1, PKVal2, PKVal3, UpdateType, PrevEntryJSON JSON will be of format: Key:Value and I preferred to go with it as columns keep on changing and I want to keep all values even if they don't change. Other

问题 I have 3-4 tables in my database which I want to track the changes for. I am mainly concerned about updates. Whenever updates happen, I want to store previous entry (value or complete row) in audit table. Basic columns I was thinking of are as following: AuditId, TableName, PK1, PK2, PK3, PKVal1, PKVal2, PKVal3, UpdateType, PrevEntryJSON JSON will be of format: Key:Value and I preferred to go with it as columns keep on changing and I want to keep all values even if they don't change. Other

问题 I want to set the UpdateSourceTrigger to an event of a control: <TextBox Text="{Binding Field, UpdateSourceMode=btnOK.Click}"> <Button Name="btnOK"> <Button.Triggers> <Trigger> <!-- Update source --> </Trigger> </Button.Triggers> </Button> I thought about two ways: Set UpdateSourceMode or some other stuff in the binding. Set an EventTrigger that updates source on button click. Possible, or I have to do it with code? 回答1: You'll have to use code. Specifically: Set UpdateSourceTrigger=Explicit

问题 Under what circumstances will table triggers cause 14 bytes to be added to the end of the row for row versioning? The "Space Used in Data Rows" section on this page clearly states "Each database row may use up to 14 bytes at the end of the row for row versioning information ... These 14 bytes are added the first time the row is modified, or when a new row is inserted, under any of these conditions ... The table has a trigger ." This didn't happen in my test (script below). When looking at the

问题 Using a SQL 2008 R2 November release database and a .net 4.0 Beta 2 Azure worker role application. The worker role collects data and inserts it into a single SQL table with one identity column. Because there will likely be multiple instances of this worker role running, I created an Insert Instead Of trigger on the SQL table. The trigger performs Upsert functionality using the SQL Merge function. Using T-SQL I was able to verify the insert instead of trigger functions correctly, new rows were