[sqlalchemy] Getting Model Name from Query object
Hi everyone,
I have a 'sqlalchemy.orm.query.Query' object from that how can i know what
model it uses
from sqlalchemy import create_engine
from sqlalchemy.ext.automap import automap_base
from sqlalchemy.orm import Session
from sqlalchemy import MetaData
engine = create_engine("sqlite:///chinook.db", echo = False)
metadata = MetaData()
model = 'employees'
metadata.reflect(engine, only=[model])
base = automap_base(metadata=metadata)
base.prepare()
map_model = base.classes[model]
session = Session(engine)
query = session.query(map_model.LastName,map_model.FirstName)
Here the model i am using is 'employees'. But how can achieve this by using
'sqlalchemy.orm.query.Query' object in the program
(i.e. query = session.query(map_model.LastName,map_model.FirstName)).
--
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http://www.sqlalchemy.org/
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[sqlalchemy] Performing filter by using string
Hi everyone,
I have an string which has the condition to be performed while retrieving
from database. I automap my model and make reference to it by using another
variable name.
How can achieve retrieve data by filter which is in string?
here is my code
from sqlalchemy import create_engine
from sqlalchemy.ext.automap import automap_base
from sqlalchemy.orm import Session
from sqlalchemy import MetaData
engine = create_engine("sqlite:///chinook.db", echo = False)
metadata = MetaData()
model = 'employees'
condition = 'employees.City == "Chennai"'
metadata.reflect(engine, only=[model])
base = automap_base(metadata=metadata)
base.prepare()
map_model = base.classes[model]
session = Session(engine)
retrieve = session.query(map_model).filter(condition)
for i in retrieve:
print(i.EmployeeId)
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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Example. See http://stackoverflow.com/help/mcve for a full description.
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Re: [sqlalchemy] automap_base with mapped class
Yeah I done it thank u mike -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
[sqlalchemy] automap_base with mapped class
from sqlalchemy.ext.automap import automap_base
from sqlalchemy import create_engine, MetaData
lists = ['employees','address']
engine = create_engine("sqlite:///chinook.db")
metadata = MetaData()
metadata.reflect(engine, only=lists)
Base = automap_base(metadata=metadata)
Base.prepare()
User = Base.classes.employees
In the above How can i achieve mapping the classes without mention the class
explicitly.
i.e User = Base.classes.employees
How can achieve same result by using the lists[0]
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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[sqlalchemy] Perfoming join on multiple tables dynamically
Hello everyone, I have parent table which holds the primary keys of several child tables.The child table are got as a list . Using SQLalchemy ORM, how can I join multiple child tables to this parent? -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
