triggers

Comparing a Null to another value in MySQL Trigger

由 断了今生、忘了曾经 提交于 2019-12-22 05:22:03
问题 So here is my issue I am comparing new and old values when a table row is being updated. But the new or old value will sometimes be null. So the code below doesn't work. Can can I remedy this issue? Thank You BEFORE UPDATE ON mytable FOR EACH ROW BEGIN IF OLD.assignedto != NEW.assignedto THEN INSERT INTO history ( asset , changedfield , oldvalue , newvalue ) VALUES ( NEW.asset, 'assignedto', OLD.assignedto, NEW.assignedto ); END IF; END$$ 回答1: Try: IF ( (OLD.assignedto IS NOT NULL AND NEW

Comparing a Null to another value in MySQL Trigger

由 痞子三分冷 提交于 2019-12-22 05:21:43
问题 So here is my issue I am comparing new and old values when a table row is being updated. But the new or old value will sometimes be null. So the code below doesn't work. Can can I remedy this issue? Thank You BEFORE UPDATE ON mytable FOR EACH ROW BEGIN IF OLD.assignedto != NEW.assignedto THEN INSERT INTO history ( asset , changedfield , oldvalue , newvalue ) VALUES ( NEW.asset, 'assignedto', OLD.assignedto, NEW.assignedto ); END IF; END$$ 回答1: Try: IF ( (OLD.assignedto IS NOT NULL AND NEW

jQuery Trigger keyCode Ctrl+Shift+z & Ctrl+z in wysiwyg textarea

由 被刻印的时光 ゝ 提交于 2019-12-22 04:57:10
问题 i was wondering how do i trigger the event keyCode composed by Ctrl+z and the event keycode composed by Ctrl+Shift+z ? 回答1: If you want to trigger the event then it should be something like this: HTML <!DOCTYPE html> <html> <head> </head> <body> <input type=button value=CTRL+SHIFT+Z id=bcsz /> <input type=button value=CTRL+Z id=bcz /> <textarea id=t ></textarea> </body> </html> JavaScript var t = document.getElementById('t'), //textarea bcsz = document.getElementById('bcsz'), //button ctrl

WPF TextBox.Text with MultiBinding

由 ▼魔方 西西 提交于 2019-12-22 04:43:34
问题 I've got Custom Control with a TextBox in the default Template. The Custom Control has these 2 dependency properties (among others): SelectedValue, NullText (text to appear in the TextBox when nothing is selected and the value is provided) I'd like to set the TextBox.Text with the NullText value when the SelectedValue null is and the NullText not null is. <TextBox.Text> <MultiBinding Converter="{StaticResource myConverter}"> <Binding RelativeSource="TemplatedParent" Path="SelectedValue"/>

Trigger for only changed values

由 会有一股神秘感。 提交于 2019-12-22 03:24:22
问题 Say we have 3 records in table: orig_tab --------------------------------------------- | PK | Name | Address | Postal Code | --------------------------------------------- | 1 | AA | Street1 | 11111 | | 2 | BB | Street2 | 22222 | | 3 | CC | Street3 | 33333 | --------------------------------------------- Now the data is changed: --------------------------------------------- | PK | Name | Address | Postal Code | --------------------------------------------- | 1 | AA | Street1 | 11111 | | 2 | BB

execute a trigger when I create a table

由 不羁岁月 提交于 2019-12-22 01:43:38
问题 I would like to know if a trigger on a system table of PostgreSQL can be executed when I create a table I need to add 2 functions on each table of my database and I would like to do it dynamically Thanks 回答1: I know it's an old question but now it has been implemented in version 9.3, or at least partially http://www.postgresql.org/docs/9.3/static/event-trigger-definition.html 回答2: This can be done with an event trigger: CREATE OR REPLACE FUNCTION on_create_table_func() RETURNS event_trigger

WPF Expanders Triggers

由 拜拜、爱过 提交于 2019-12-22 00:42:54
问题 I have 2 expanders side by side. Only 1 can be opened at a time. I want to write Triggers for them directly in their definition like this: <Expander x:Name="MenuOverView" ExpandDirection="Left"> <Expander.Triggers> <Trigger Property="IsExpanded" Value="False" SourceName="MenuDetailed"> <Setter Property="IsExpanded" Value="True" TargetName="MenuOverView" /> </Trigger> </Expander.Triggers> </Expander> <Expander x:Name="MenuDetailed" ExpandDirection="Right"> <Expander.Triggers> <Trigger Property

Automatically Update Field in Database

由 孤街醉人 提交于 2019-12-22 00:24:22
问题 I'd like to automatically update a database column with an aggregate of another column. There are three tables involved: T_RIDER RIDER_ID TMP_PONYLIST ... T_RIDER_PONY RIDER_ID PONY_ID T_PONY PONY_ID PONY_NAME ... T_RIDER and T_PONY have an n:m relationship via T_RIDER_PONY . T_RIDER and T_PONY have some more columns but only TMP_PONYLIST and PONY_NAME are relevant here. TMP_PONYLIST is a semicolon spararated list of PONY_NAMES , imagine something like "Twisty Tail;Candy Cane;Lucky Leaf" . I

pragma autonomous_transaction in a trigger

由 巧了我就是萌 提交于 2019-12-21 17:52:28
问题 I have written a trigger on one table which deletes data from other table upon a condition. The trigger has pragma autonomous_transaction, and trigger works as intended. However, I do wonder if there can be any problems in future, say if data is inserted by multiple users/sources at the same time etc...Any suggestions? Source table t1: -------------------------------------------- | user_id | auth_name1 | auth_name2 | data | -------------------------------------------- | 1 | Name1 | Name2 | d1

PostgreSQL trigger not returning anything

由 久未见 提交于 2019-12-21 17:35:50
问题 I have a PostgreSQL trigger on create that basically redirects inserts into sub-tables. Once I insert the record, I want to ABORT the request as to avoid duplicate data. The only way (that I know of) to do this is to return NULL in the trigger. The problem is that I need the record to be returned so I can get the ID. If I return NULL , I get ... NULL . Any idea how I can have a trigger abort an operation while still returning something other than NULL ? 回答1: Your question leaves room for
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