# re = session.query(New_Table).filter(and_(New_Table.key1=a,New_Table.key2=b)).one() Re=session.query(New_Table).filter_by(key1=a).one() Session.query(New_Table).filter_by(key1=a).update() Re = session.query(New_Table).filter_by(key2 =22).scalar() # If it exists, it is an object, If it does not exist, it is None Re =session.query(New_Table).get(6) # Query with primary key Re =session.query(New_Table).filter_by(key2 =22).one() Re =session.query(New_Table).filter_by(key2 =22).first() Re = session.query(New_Table).filter(New_Table.key2=22).all() Re = session.query(New_Table).filter_by(key2 =22).all() # Returns a list of objects Id = Column(Integer,nullable=False,primary_key=True, autoincrement=True) # Create the class corresponding to the table # This article must, Every time a database operation is performed, I need to create one of them Connection Two 、 Basic operationīecause of class mapping, Counter table new_table Added a column of primary keysĪlter table newtable add id int unsigned not Null auto_increment primary key import sqlalchemyįrom import declarative_baseįrom sqlalchemy import Column,Integer,StringĭB_URI # = declarative_base(engine) # Create base class, The classes corresponding to all tables must inherit from this base class ![]() Sqlalchemy Proposed installation 1.3.15 edition, Too old versions may report errors. sqlalchemy Cannot operate on the database independently, You need to use other third-party plug-ins, Here I use pymysql. ![]() Object relation mapping (Object Relational Mapping,ORM), The operation of the database, Mapping to operations on classes, A table corresponds to a class.
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