sqlalchemy select by filter

Question

app.py:

from flask import Flask, render_template
from itertools import groupby
from flask import request
import MySQLdb
from flask_sqlalchemy import SQLAlchemy
from sqlalchemy.ext.automap import automap_base
from sqlalchemy.orm import Session
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from db import PUser


engine = create_engine('mysql://myusername:mypassword@localhost/mydbname')
engine.connect()
Session = sessionmaker(bind=engine)
session = Session()


app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://myusername:mypassword@localhost/mydbname'
db = SQLAlchemy(app)


@app.route('/people/')
def people():
    result = pUser.query.filter_by(shahr = 'tehran')
    result = PUser.query.all()

    return result

In the script above, how should I edit these lines to work?

result = PUser.query.filter_by(shahr = 'tehran')
result = PUser.query.all()

I want to select all data from "PUser" table and also know how to filter my select query.

Puser is the name of a table in my database, and this is a part of db.py in the same directory:

class PUser(Base):
    __tablename__ = 'p_user'

Answer 1

You are making two queries and that's probably why you aren't getting the desired result.

pUser.query creates a Query object. On that you're able to call stuff like select_from , join , filter , filter_by and other methods like that, which also return a Query object.

To get the resulting rows to a python list , you have to call all , one etc. on that.

So, in your case

result = pUser.query.filter_by(shahr='tehran').all()