activerecord-import-oracle_enhanced is an extension for activerecord-import to provide support for the activerecord-oracle_enhanced-adapter.
It uses Oracle multitable insert and assumes that you have a DML trigger setup for the targeting table before inserting.
Since Oracle needs to prefetch the primary key and a call to <sequence_name>.nextval will always return the same value in an INSERT ALL statement. Consequently, if you want to properly use this gem and bulk insert data into tables which have a primary key without providing said key, you have to create a DML trigger which fires before inserting a row into your table and setting your primary key if it is not set. Such a trigger could be written as such (replacing <table_name> and <sequence_name> with the proper values) :
CREATE OR REPLACE trigger <table_name>_trg
before insert on <table_name>
for each row
BEGIN
IF :new.id IS NULL THEN :new.id := <sequence_name>.nextval;
END IF;
END;
/Bear in mind that you have to respect Oracle limitations of 30 characters for the trigger name.
Copyright (c) 2017 Félix Bellanger felix.bellanger@gmail.com
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