<trim prefix="where" prefixOverrides="and |or "> ... </trim> 1. 2. 3. 四、foreach 用法 foreach可以方便地实现in集合。 foreach 可以对数组、 Map 或实现了Iterable 接口(如 List、 Set)的对象进行遍历。数组在处理时会转换为List对象,因此foreach遍历的对象可以分为两大类:Iterable类型和 Map 类型。
asyncdefget_ous_by_user(self, db: AsyncSession, user_id: str) ->list[int]:"""获取指定用户的关联的机构列表"""#方式一,子查询方式stmt = select(User).options(selectinload(User.ous)).where(User.id ==user_id) result=await db.execute(stmt) user=result.scalars().first() ous= user.ousi...
session.add(child_node2)#查询数据async with session.begin(): result=await session.execute("SELECT * FROM dict_type_info WHERE pid IS NULL") parent_nodes=result.scalars().all()fornodeinparent_nodes:print(f"Parent Node: {node.name},Children: {[child.name for child in node.children]}") ...
对于该标签的执行,当test的值为true时,会讲其包含的SQL片断拼接到SQL语句中;在只是要标签的时候,存在一个比较麻烦的地方,我们需要在where后手工添加1=1的子句,因为如果where后的所有标签条件都是false,并且where子句后没有1=1,则SQL中就后面就一个空的where,SQL就出错看。所以当在where后,要添加一个1=1的子句...
from sqlalchemy import event from sqlalchemy.schema import UniqueConstraint def unique_constraint_name(const, table): const.name = "uq_%s_%s" % ( table.name, list(const.columns)[0].name ) event.listen( UniqueConstraint, "after_parent_attach", unique_constraint_name) 参数: insert(bool) -...
CREATE TABLE - structural table = Table("table", metadata_obj, Column("x", Integer), Column("y", Integer)) # columns in a SELECT statement - structural stmt = select(table.c.x, table.c.y) # literal elements in an IN clause - data stmt = stmt.where(table.c.y.in_([1, 2, 3...
result = await conn.execute(select(t1).where(t1.c.name == "some name 1")) ... ... print(result.fetchall()) ... ... # for AsyncEngine created in function scope, close and ... # clean-up pooled connections ... await engine.dispose() >>> asyncio.run(async_main()) BEGIN (...
anon_1.index AS anon_1_indexFROM a AS a_1JOIN (SELECT b.id AS id, b.a_id AS a_id, b.data AS data,row_number() OVER (PARTITION BY b.a_id ORDER BY b.id) AS indexFROM b) AS anon_1ON anon_1.a_id = a_1.id AND anon_1.index < %(index_1)sWHERE a_1.id IN ( ....
内部采用threading.local进行隔离 session = scoped_session(Session) cursor = session.execute(r"select * from students where id <= (:num)",params={"num":2}) print(cursor.fetchall()) # 提交 session.commit() # 关闭链接 session.close()...
fetchall() for i in r: print(i) else: print("no user") 假设,username是我们从用户的输入中获取到的,比如通过网页post或者get过来的参数输入,未经过我们的处理然后我们在数据库中查找这个用户,比如username是yyx时,我们拼接的sql语句是select * from user where username = 'yyx' ,这时一切还比较顺利,...