A SQL query will be routed to read_sql_query, while a database table name will be routed to read_sql_table. Note that the delegated function might have more specific notes about their functionality not listed here. Parameters sql str or SQLAlchemy Selectable (select or text object) SQL query to be executed or a table name.
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Feb 14, 2006 · With SQLAlchemy, there's no such thing as "the ORM generated a bad query" - you retain full control over the structure of queries, including how joins are organized, how subqueries and correlation is used, what columns are requested. Everything SQLAlchemy does is ultimately the result of a developer- initiated decision.
Jul 10, 2019 · A subsequent query using the same engine would use the same connection. This means that if no concurrent connections are needed, only one connection will ever be open in the database. This is why SQLAlchemy uses this kind of connection pooling by default: it will not use any more resources than actually requested by the application.
YES! Ok, that seems a lot more sensible and brings in more of the sqlalchemy engine machinery, including dialect initialisation. However, so because the default state of DB API connections is that they are in autocommit off mode, you have the nasty side-effect that using the connection to execute any command starts a transaction for you.
Nov 16, 2017 · In your controllers, all you have to do is to call the serialize() function (or serialize_list(l) if the query results in a list) on the results: def get_user(id): user = User.query.get(id) return json.dumps(user.serialize()) def get_users(): users = User.query.all() return json.dumps(User.serialize_list(users))
from sqlalchemy_sqlschema import maintain_schema with maintain_schema ("my_schema", session): schema = session. execute ("show search_path"). scalar assert schema == "my_schema" # the following query needs to find a `my_schema.my_model_table` table session. query (MyModel) # a rollback still maintains the schema session. rollback assert session ...