Contents
How to use trigger context variables in apex?
Trigger Context Variables Variable Usage new Returns a list of the new versions of th newMap A map of IDs to the new versions of the old Returns a list of the old versions of th oldMap A map of IDs to the old versions of the
How to create a Migrations Project in dbcontext?
Steps 1 Create a new class library. 2 Add a reference to your DbContext project. 3 Move the migrations and model snapshot files to the class library.
Can a dbcontext be stored in a different project?
You may want to store your migrations in a different project than the one containing your DbContext. You can also use this strategy to maintain multiple sets of migrations, for example, one for development and another for release-to-release upgrades.
What are the stored subprograms and triggers in Oracle?
Oracle stores triggers and stored subprograms with the server. Oracle has three different kinds of stored subprograms: functions, stored procedures, and packages. For detailed discussion on all these objects, see the PL/SQL User’s Guide and Reference, Release 1(9.0.1). Triggers
How are Lightning components executed in execution context?
Lightning components can also be executed by Lightning processes and flows. Besides invoking Apex code, actions, such as creating a new task, sending an email, performing a field update, or sending an outbound message, can all be triggered by one of the declarative platform features. These actions also run within an execution context.
Can you use trigger.old in apex DML?
Be aware of the following considerations for trigger context variables: trigger.new and trigger.old cannot be used in Apex DML operations. You can use an object to change its own field values using trigger.new, but only in before triggers. trigger.old is always read-only. You cannot delete trigger.new.
How to use only one trigger per object?
Press Ctrl + S to save your class. It’s considered a best practice to use only one trigger per object, which you see in the following example. You can then use context-specific handler methods within triggers to create logic-less triggers. By adopting this practice, you can avoid the common pitfalls that new developers fall into.