How to insert data into a view in Oracle _oracle application

Conditions for inserting a view:
1. If the view is based on a base table, then this is called a connectionless view, and all of the disconnected views are updatable, that is, you can do it on the view, Insert,update,delete the operation.
2. If you are connecting to a view, follow the basic update guidelines. Now I'll just do the INSERT guidelines: you cannot explicitly or implicitly refer to a field in any non-code-reserved underlying table in an INSERT statement, if the WITH CHECK option clause is used in the definition view, Then you can't insert on the view.
Note: Code Reservation table, non-code Reservation table interpretation:
In DEPT, Dept_no is the main code, the EMP, the Emp_no is the main code.
Then establish a connection view:
CREATE View emp_dept as
Select Emp.emp_no,emp.emp_name,emp.dept_no,dept.name
From Emp,dept
where Emp.dept_no=dept.dept_no

In this view, Emp_no still acts as the primary code, so the EMP is the Code Reservation table, and the Dept_no in the dept is not the main code, so it is not a code-reserved table.

To insert data into a view after multiple tables are associated, it is recommended that you use an alternate trigger

Create TRIGGER [trigger name]
On [view name]
Instead of insert
As
Begin
--declaring variables;
--To identify all the data of the columns from the inserted table and assign them to the declared variables respectively;

--insert data into the first table with the above data
--insert data into the second table with the above data
End

It is also possible to query the table or whether the view is updatable through the User_updatable_columns table.