SQLAlchemy ORM – Creating Session In order to interact with the database, we need to obtain its handle. A session object is the handle to database. Session class is defined using sessionmaker() – a configurable session factory method which is bound to the engine object created earlier. from sqlalchemy.orm import sessionmaker Session = sessionmaker(bind = […]
Category Archives: sqlalchemy
SQLAlchemy ORM – Using Query All SELECT statements generated by SQLAlchemy ORM are constructed by Query object. It provides a generative interface, hence successive calls return a new Query object, a copy of the former with additional criteria and options associated with it. Query objects are initially generated using the query() method of the Session […]
Using UPDATE Expression The update() method on target table object constructs equivalent UPDATE SQL expression. table.update().where(conditions).values(SET expressions) The values() method on the resultant update object is used to specify the SET conditions of the UPDATE. If left as None, the SET conditions are determined from those parameters passed to the statement during the execution and/or […]