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[已解决]Flask中使用sqlalchemy出现警告:UserWarning SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead

Flask crifan 3778浏览 0评论

已经解决了:

[已解决]Flask运行出错:ImportError: No module named flask_sqlalchemy

但是运行又警告:

(SIPEvents) ➜  SIPEvents python
Python 2.7.12 (default, Aug 15 2016, 11:09:04) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2
Type “help”, “copyright”, “credits” or “license” for more information.
>>> from app import db
/root/Envs/SIPEvents/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py:800: UserWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True to suppress this warning.
  warnings.warn(‘SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True to suppress this warning.’)

<div–<——————————————————————————

DEBUG in app [app.py:35]:
db=<SQLAlchemy engine=’sqlite:////usr/share/nginx/html/SIPEvents/sipevents.db’>

<div–<——————————————————————————

>>>

相关代码:

from flask_sqlalchemy import SQLAlchemy

搜:

UserWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future

参考:

python – How do I know if I can disable SQLALCHEMY_TRACK_MODIFICATIONS? – Stack Overflow

去添加对应的配置:

SQLALCHEMY_TRACK_MODIFICATIONS = False

(SIPEvents) ➜  SIPEvents cat instance/config.py 
SQLALCHEMY_DATABASE_URI = ‘sqlite:////usr/share/nginx/html/SIPEvents/sipevents.db’
SQLALCHEMY_TRACK_MODIFICATIONS = False

然后再去运行,就没有了这个警告了:

(SIPEvents) ➜  SIPEvents python
Python 2.7.12 (default, Aug 15 2016, 11:09:04) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2
Type “help”, “copyright”, “credits” or “license” for more information.
>>> from app import db

<div–<——————————————————————————

DEBUG in app [app.py:35]:
db=<SQLAlchemy engine=’sqlite:////usr/share/nginx/html/SIPEvents/sipevents.db’>

<div–<——————————————————————————

>>>

[总结]

如果你的应用没有使用Flask-SQLAlchemy的事件系统,那么可以放心的去:

在对应的配置文件添加:

SQLALCHEMY_TRACK_MODIFICATIONS = False

即可消除此警告。

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