create_engine → Makes a connection to a database (like opening a door to the database). Column → Used to create a column in a database table. String → Says that a column will store text. Integer → ...
SQLAlchemy对象关系映射代表了用户使用Python定义类来与数据库中的表相关联的一种方式，类的实例则对应数据表中的一行数据 ...
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