Flask-Sqlalchemy设置引擎配置

Question

SqlAlchemy扩展:https://pythonhosted.org/Flask-SQLAlchemy/index.html

我想使用以下参数设置带有客户配置的引擎:http: //docs.sqlalchemy.org/en/rel_0_9/core/engines.html

我正在使用Flask-SqlAlchemy文档中描述的方式:

from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db'
db = SQLAlchemy(app)


class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True)
    email = db.Column(db.String(120), unique=True)

    def __init__(self, username, email):
        self.username = username
        self.email = email

    def __repr__(self):
        return '<User %r>' % self.username

编辑:如何在这种配置中传递以下引擎参数:

isolation_level = 'AUTOCOMMIT', encoding='latin1', echo=True

方法:SQLAlchemy()不将这些作为参数.

Answer 1

这是一个悬而未决的问题:https://github.com/mitsuhiko/flask-sqlalchemy/issues/166

你可以试试这个

class SQLiteAlchemy(SQLAlchemy):
    def apply_driver_hacks(self, app, info, options):
        options.update({
            'isolation_level': 'AUTOCOMMIT', 
            'encoding': 'latin1', 
            'echo': True
        })
        super(SQLiteAlchemy, self).apply_driver_hacks(app, info, options)

db = SQLiteAlchemy(app)

Answer 2

这只是一个配置选项。这是我们的：

SQLALCHEMY_ENGINE_OPTIONS = {
    "pool_pre_ping": True,
    "pool_recycle": 300,
}