python - SQLAlchemy IN clause - Stack Overflow
2011年12月22日 · An alternative way is using raw SQL mode with SQLAlchemy, I use SQLAlchemy 0.9.8, python 2.7, MySQL 5.X, and MySQL-Python as connector, in this case, a tuple is needed. My code listed below:
python - SQLAlchemy - Getting a list of tables - Stack Overflow
2018年5月25日 · All of the tables are collected in the tables attribute of the SQLAlchemy MetaData object. To get a list of the names of those tables: >>> metadata.tables.keys() ['posts', 'comments', 'users'] If you're using the declarative extension, then you probably aren't managing the metadata yourself. Fortunately, the metadata is still present on the ...
SQLAlchemy: What's the difference between flush() and commit()?
flush() is always called as part of a call to commit() (1). When you use a Session object to query the database, the query will return results both from the database and from the flushed parts of the uncommitted transaction it holds. By default, Session objects autoflush their operations, but this can be disabled.
python - SQLAlchemy ORDER BY DESCENDING? - Stack Overflow
For official docs please use the link or check below snippet: sqlalchemy.sql.expression.desc (column) Produce a descending ORDER BY clause element. e.g.: from sqlalchemy import desc. stmt = select([users_table]).order_by(desc(users_table.c.name)) will produce SQL as: SELECT id, name FROM user ORDER BY name DESC.
python - SQLAlchemy default DateTime - Stack Overflow
Again, best to tell the DB to calculate the timestamp itself: from sqlalchemy.sql import func. time_created = Column(DateTime(timezone=True), server_default=func.now()) time_updated = Column(DateTime(timezone=True), onupdate=func.now()) There is a server_onupdate parameter, but unlike server_default, it doesn't actually set anything serverside.
python - add column to SQLAlchemy Table - Stack Overflow
2018年1月10日 · Using sqlAlchemy's append_column functionality had some unexpected downstream effects ('str' object has no attribute 'dialect impl'). I corrected this by adding the column with DDL (MySQL database in this case) and then reflecting the table back from the DB into my metadata.
python - How to close a SQLAlchemy session? - Stack Overflow
A SQLAlchemy Session generally represents the scope of one or more transactions, upon a particular database connection. Therefore, the answer to your question as literally asked, is to call session.close() , that is, "how to properly close a SQLAlchemy session".
SQLAlchemy ORM conversion to pandas DataFrame - Stack Overflow
2015年4月9日 · 36. For completeness sake: As alternative to the Pandas-function read_sql_query(), you can also use the Pandas-DataFrame-function from_records() to convert a structured or record ndarray to DataFrame. This comes in handy if you e.g. have already executed the query in SQLAlchemy and have the results already available:
SQLAlchemy support of Postgres Schemas - Stack Overflow
2. For anyone who is coming here, for a more general solution that can support MYSQL or Oracle, please refer to this guide. So basically it set the schemas for the engine when the first connection to the database is made. engine = create_engine("engine_url") @event.listens_for(engine, "connect", insert=True) def set_current_schema(dbapi ...
How to serialize SqlAlchemy result to JSON? - Stack Overflow
d = dict(row.items()) Then serialize that to JSON ( you will have to specify an encoder for things like datetime values ) It's not that hard if you just want one record ( and not a full hierarchy of related records ). json.dumps([(dict(row.items())) for row in rs]) edited Jun 12, 2016 at 0:04. Sum.