带有 2 个 primary_keys 的 SQLAlchemy 表如何自动递增第一个主键

Question

I have table with 2 primary keys, where second primary key is also a foreign key. When I try to populate the DB I will get "NOT NULL constraint failed: items.id1" error. When populating I will always provide known id for id2. So how can I make the sqlalchemy to autoincrement id1?

class items(Base):
    __tablename__ = 'items'
    id1 = Column(BIGINT(unsigned=True).with_variant(Integer, "sqlite"), primary_key=True,)
    #location id
    id2 = Column(Integer, ForeignKey('table2.id'), primary_key=True)

Combination of id1 and id2 has to always be unique, and combination of those 2 are used to identify the items. id1 isn't enough since databases can be in several locations and tables are synchronized time to time.

I already tried this solution but it's outdated and doesn't work anymore: How to insert a row with autoincrement id in a multi-primary-key table?

EDIT: Work around for this problem is to use Postgres DB. SQLite is lite but dumb.

Answer 1

If you are using sqlite:

id1 = Column(BIGINT(unsigned=True).with_variant(Integer, "sqlite"), primary_key=True, sqlite_autoincrement=True)
id2 = Column(Integer, ForeignKey('table2.id'), primary_key=True, sqlite_autoincrement=False)

If you are using mysql, then simple autoincrement will work:

id1 = Column(BIGINT(unsigned=True).with_variant(Integer, "sqlite"), primary_key=True, autoincrement=True)
id2 = Column(Integer, ForeignKey('table2.id'), primary_key=True, autoincrement=False)

PS: Drop table first and try again.