triggers

问题 This question already has answers here : ORA-04091: table [blah] is mutating, trigger/function may not see it (4 answers) Closed 3 years ago . When I declare a trigger in my Oracle database project, I'm getting an error, which says: ERROR at line 1: ORA-04091: table MIHAL277.LEAGUE_GAMES is mutating, trigger/function may not see it ORA-06512: at "MIHAL277.DELETE_UNUSED_GAME", line 4 ORA-04088: error during execution of trigger 'MB358996.DELETE_UNUSED_GAME' Basically I'm creating an academic

问题 The code I have doesn't work, Oracle tells me the trigger has been created with build errors. Apparently I can't get any more precise information about what the build error is... I really haven't done a lot of SQL before so I'm not that familiar with the syntax. I have a hunch it's my IF EXISTS (SELECT ...) THEN statement that Oracle doesn't like, I've been Googling for similar examples but I couldn't really find anything that worked in my situation. So about the code: "debut" is a date

问题 Is it possible to create a trigger in MySQL using dynamically generated SQL from within a stored procedure? I am executing other dynamically constructed queries in my procedure by preparing a statement, but when I try the same approach to create a trigger I get the following error: ERROR Code: 1295This command is not supported in the prepared statement protocol yet From Bug #31625, PREPARED STATEMENT syntax does not allow to create TRIGGERS I see other people have been complaining about the

问题 Is it possible to create a trigger in MySQL using dynamically generated SQL from within a stored procedure? I am executing other dynamically constructed queries in my procedure by preparing a statement, but when I try the same approach to create a trigger I get the following error: ERROR Code: 1295This command is not supported in the prepared statement protocol yet From Bug #31625, PREPARED STATEMENT syntax does not allow to create TRIGGERS I see other people have been complaining about the

问题 I have table Risks and history table Risks_history . In Risks table i have data like below: ----------------------------- | ID | DealID | Description | ----------------------------- | 1 | 14 | Risk1 | ----------------------------- | 2 | 14 | Risk2 | ----------------------------- | 3 | 14 | Risk3 | ----------------------------- | 4 | 15 | Risk4 | ----------------------------- So here is we can see that one deal can have several Risks. I need to save data of table Risks in history like below: -

问题 I am trying to use the Silverlight DataStateBehavior, it works fine in most cases where I click a button which sets say a 'Selected' Property in the view model to either false or true. The DataStateBehavior then tells the VisualStateManager to go to the relevant state. Like this: <Button...> <i:Interaction.Behaviors> <id:DataStateBehavior Binding="{Binding Selected}" Value="True" TrueState="SelectedVisualState" FalseState="DeselectedVisualState"/> </i:Interaction.Behaviors> </Button> The

问题 I've been trying to use jquery to trigger a click. I've discovered that triggered clicks, like this: $(button).trigger('click'); do not follow hrefs. I've been trying to make an ajax submission by triggering the submit button, but no go. I know I can submit directly. But is there any way of triggering the button? Thanks. 回答1: jQuery does not trigger the native "click" on A elements on purpose. I don't know why. But you can use the technique they use to trigger the link yourself: $link[0]

问题 I have a trigger in SQL Server, but I need to pass arguments to the CLR code, i.e., information not provided in the trigger context. Is something like this even possible? CREATE TRIGGER MyTrigger ON MyTable FOR INSERT AS EXTERNAL NAME MyAssembly.MyNamespace.MyTriggerHandler("Foo", "Bar") These arguments would be static, of course. The number of argument permutations is discrete, but creating a separate class or function in the CLR assembly for each would be unwieldy, and would require a

问题 I need some help with a mysql trigger. I am currently trying to tidy up some code and offload some processing to the mysql database rather than running 2 queries and joins etc... When someone inserts into a video into a database, I would like the video count in the category to update. So you specify the category id. This is what I have so far so any help would be good as i just dont seem to be able to get the syntax correct. CREATE TRIGGER 'db_videos'.'update_video_count' AFTER INSERT ON

问题 I've a very simple database with following schema: video (id, title, description) category (id, name) tag (id, name) video_category_reference (video_id, category_id) video_tag_reference(video_id, tag_id) abc_table (video_id, description, categories) The first five tables use InnoDB engine. The last table - abc_table uses MyISAM engine and it contains some kind of "cache". description column stores the result of CONCAT(video.title, video.description, GROUP_CONCAT(tag.name)) and categories