Hi, I use SQLalchemy 0.7.9 with SQLite and have a performance issue. I have a simple database with joined table inheritance and some relationships. In short: I have a base class Human, and 3 subclasses (Men, Woman and Child), and I have a class House. The house class have a many to many relationship to the human class (a house have residents, and every human have houses). And there are two more relationship, the Woman and the Men class have a many to many relationship to the Child class (a men/woman can have many children). Here you can see my model , query code: http://pastebin.com/mcum0c7Q
The issue is: if I load a house from the database with house = session.query(House).first() and then access the residents of this house with "house.residents", and iterate over the residents and access the children of every resident then sqlalchemy emits a new sqlquery on every access: for resident in house.residentes: print resident.myChildren # emits new sql-query This is very bad for my performance, what I need is a solution, that load with a single "session.query(House)-Command" all residents AND all children of the residents at once! Is this possible? For the many to many relationship between the Women/Men and the Child class is use lazy='subquery', but sqlalchemy ignore this! Why? I hope someone could help me. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/__1nn279L1EJ. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
