其他方法 execute,update,insert,select,delete,join等 自行补脑 3)创建表结构 使用Schema Type/SQL Expression Language/Engine/ConnectionPooling/Dialect 进行数据库操作。Engine使用Schema Type创建一个特定的结构对象,之后通过SQL Expression Language将该对象转换成SQL语句,然后通过 ConnectionPooling 连接数据库,再然后通...
MariaDB [db_1803]>SELECT@@character_set_database, @@collation_database;+---+---+|@@character_set_database|@@collation_database|+---+---+|utf8|utf8_general_ci|+---+---+ 其他的一些设置方法: 修改数据库的字符集 use mydbalterdatabase mydb_namecharactersetutf-8; 创建数据库指定数据...
from sqlalchemy import select 其他模块同上 #查询user表里的内容 sql = select([user, ]) res =conn.execute(sql) print res.fetchall() conn.close() 结果: [(1L, 'no1'), (2L, 'no1'), (3L, 'yaoyao'), (4L, 'yao')] #查询user表下的id sql = select([, ]) res =conn.execute(sq...
from sqlalchemy import create_engine from sqlalchemy import select if __name__ == "__main__": engine = create_engine("mysql+mysqldb://scott:tiger@localhost/test", echo_pool=True) def do_a_thing(engine): with engine.begin() as conn: while True: print("ping: %s" % conn.execute(se...
from sqlalchemy.ext.automap import automap_base from sqlalchemy.orm import Session from sqlalchemy import create_engine Base = automap_base() # engine, suppose it has two tables 'user' and 'address' set up engine = create_engine("sqlite:///mydatabase.db") # reflect the tables Base.pr...
filter_by(length=5) SELECT interval.id AS interval_id, interval.start AS interval_start, interval."end" AS interval_end FROM interval WHERE interval."end" - interval.start = :param_1 上述还有一个写着玩儿的setter,hybrid_property支持: comparator 扩展Interval.length在各种比较符(><=)的行为 ...
test=> select current_schema(); current_schema --- public (1 row)如上所述,在普通安装的 PostgreSQL 上,默认模式名称是名称public。然而,如果您的数据库用户名与模式名称匹配,PostgreSQL 的默认行为是将该名称用作默认模式。下面,我们使用用户名scott登录。当我们创建一个名为scott的模式时,它会隐式地更改默...
46 from sqlalchemy.orm import sessionmaker 47 48 Session = sessionmaker(bind=engine) 49 50 db = Session() 51 52 child_one = Child(name='purk1') 53 child_two = Child(name='purk2') 54 child_three = Child(name='purk3') 55 child_four = Child(name='purk4') ...
separate_tables.py- Illustrates sharding using a single SQLite database, that will however have multiple tables using a naming convention. separate_databases.py- Illustrates sharding using distinct SQLite databases. 扩展ORM ORM查询事件 说明ORM SELECT行为增强的配方Session.execute()具有2.0 style使用select...
of the owningSession. If the given primary key identifier is present in the local identity map, the object is returned directly from this collection and no SQL is emitted, unless the object has been marked fully expired. If not present, a SELECT is performed in order to locate the object....