[英]How to use Postgres' Hstore column with flask-sqlalchemy?
I am attempting to implement this code https://gist.github.com/1859653 that allows sqlalchemy to interact with an hstore column. 我正在尝试实现此代码https://gist.github.com/1859653 ,它允许sqlalchemy与hstore列进行交互。
Its mentioned in that gist's comments the need to run the psycopg2.extras.register_hstore. 它在gist的评论中提到需要运行psycopg2.extras.register_hstore。 When and were should this function be run?
什么时候应该运行这个功能? If i do:
如果我做:
@app.before_request
def reg_hstore() :
register_hstore(db.engine.raw_connection(), True)
heroku errors with 'too many connections' heroku错误与'太多连接'
there is also mention of using pghstore (http://pypi.python.org/pypi/pghstore) instead of psycopg2 but it gives no indication how to set it up. 还提到使用pghstore(http://pypi.python.org/pypi/pghstore)而不是psycopg2,但它没有说明如何设置它。
Also, I'm wondering if the use of hstore indexes is supported in this add-on code. 另外,我想知道这个附加代码是否支持使用hstore索引。
Since SQLAlchemy 0.8, psycopg2
connector for PostgreSQL (which is default) will register hstore extension by default and the apply_driver_hacks
workaround is not needed anymore. 从SQLAlchemy 0.8开始,PostgreSQL的
psycopg2
连接器(默认情况下) 将默认注册hstore扩展 ,并且不再需要apply_driver_hacks
解决方法。
Also, SQLAlchemy 0.8+ has builtin HSTORE
type support. 此外,SQLAlchemy 0.8+内置了
HSTORE
类型支持。
Try this: 尝试这个:
from flaskext.sqlalchemy import SQLAlchemy
import psycopg2
import psycopg2.extras
class _SQLAlchemy(SQLAlchemy):
def apply_driver_hacks(self, app, info, options):
"""This method adds option to support hstore on psycopg2"""
if info.drivername == "postgres":
def _connect():
conn = psycopg2.connect(user=info.username,
host=info.host,
port=info.port,
dbname=info.database,
password=info.password)
psycopg2.extras.register_hstore(conn)
return conn
options["creator"] = _connect
SQLAlchemy.apply_driver_hacks(self, app, info, options)
Also see: 另见:
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