Python flask sqlalchemy multi-field query, dynamically change the query statement

suddenly there is an idea that if the field changes are complicated when making a query, you can"t write the query statement, just like
A.query.filter (name=="ds") is written dead. If I need to dynamically switch query fields, especially when there are multiple fields, the idea is to have a function as the query condition, so I can control the output of the function, similar to A.query.filter (fun ()) when fun returns" age==18",
if I need to look up name, or more fields, just change the output of func.

I know that you can"t give a function directly, but usually write a query statement, so that the query is fixed and inflexible.
I wonder if my idea can be implemented (one way is to use eveal () to wrap the entire query, and then modify the filter Filter parameters), is there a better way to implement it?

Flask-sqlalchemy python3.x

Mar.07,2021

I am usually encapsulated into a function with multiple parameters. If the parameter is an empty string or-1, it means that there is no such query condition

from sqlalchemy.sql import and_, or_
-sharp 
def get_safety_list(offset, limit, con_date1, con_date2, con_invite, con_name, con_plan, salesman, con_pay):
    try:
        condition = (Safety.id > 0)

        if con_date1 > 0:
            condition = and_(condition, Safety.date >= con_date1)
            condition = and_(condition, Safety.date <= con_date2)

        if con_invite != "":
            condition = and_(condition, Safety.invite.ilike('%' + con_invite + '%'))
        if con_name != "":
            condition = and_(condition,
                             or_(Safety.name.ilike('%' + con_name + '%'), Safety.phone.ilike('%' + con_name + '%')))
        if con_plan != -1:
            condition = and_(condition, Safety.safety_plan == con_plan)

        if len(salesman) > 0:
            condition = and_(condition, Safety.invite.in_(salesman))

        if con_pay != -1:
            condition = and_(condition, Safety.origin == con_pay)

        a = Safety.query.filter(condition)
        count = a.count()
        a = a.order_by(Safety.id.desc()).limit(limit).offset(offset).all()
        return a, count
    except Exception as e:
        logging.error("manager.dbhelper.py get_safety_list exception:" + str(e))
    return (), 0

Previous: How does php curl take the second "third" and "fourth"?

Next: What does verify & & verify () mean?

How to initialize the database by directly executing the SQL script using Flask-SQLAlchemy?
problem description I want to execute the SQL script directly to initialize the database when initializing the flask application. the database is Postgresql. the environmental background of the problems and what methods you have tried flask tutor...

Flask-sqlalchemy python3.x

Mar.25,2021

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1be2aa0-31639.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be2aa0-31639.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?