问题
I\'m using Flask-SQLAlchemy to query from a database of users; however, while
user = models.User.query.filter_by(username=\"ganye\").first()
will return
<User u\'ganye\'>
doing
user = models.User.query.filter_by(username=\"GANYE\").first()
returns
None
I\'m wondering if there\'s a way to query the database in a case insensitive way, so that the second example will still return
<User u\'ganye\'>
回答1:
You can do it by using either the lower or upper functions in your filter:
from sqlalchemy import func
user = models.User.query.filter(func.lower(User.username) == func.lower("GaNyE")).first()
Another option is to do searching using ilike instead of like:
.query.filter(Model.column.ilike("ganye"))
回答2:
Improving on @plaes's answer, this one will make the query shorter if you specify just the column(s) you need:
user = models.User.query.with_entities(models.User.username).\
filter(models.User.username.ilike("%ganye%")).all()
The above example is very useful in case one needs to use Flask's jsonify for AJAX purposes and then in your javascript access it using data.result:
from flask import jsonify
jsonify(result=user)
回答3:
you can do
user = db.session.query(User).filter_by(func.lower(User.username)==func.lower("GANYE")).first()
Or you can use ilike function
user = db.session.query(User).filter_by(User.username.ilike("%ganye%")).first()
来源：https://stackoverflow.com/questions/16573095/case-insensitive-flask-sqlalchemy-query