Management key id primary auto increment without using triggers

Hi, we have a lot of table in our database with the installation of key ID primary autoincrement than they are in MySQL since we are in the process of migrating to Oracle of MySQL. Now in oracle I learned recently that this application requires the creation of a sequence and a trigger on the id for each table in the type field. We have tables of 30-40 in our scheme and we want to avoid the use of database triggers in our product, as the management of database is out of reach for our device software.
What are my options to implement the auto increment id feature in oracle... aside from manually specifying the id in the code and it management in the code that would change many existing insert statements. Some info about our application environment: groovy grails, hibernate, oracle, support for mysql

It is NOT auto-increment, you can avoid manual entry. When executing the INSERT statement, you must use the value of the sequence.

Tags: Database

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