sqlmodel | SQL databases in Python designed for simplicity | SQL Database library
kandi X-RAY | sqlmodel Summary
kandi X-RAY | sqlmodel Summary
SQLModel is a library for interacting with SQL databases from Python code, with Python objects. It is designed to be intuitive, easy to use, highly compatible, and robust. SQLModel is based on Python type annotations, and powered by Pydantic and SQLAlchemy.
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Top functions reviewed by kandi - BETA
- Create an engine instance .
- Define a field .
- Return the appropriate SQLAlchemy type .
- Execute a statement .
- Return the column from a field .
- Calculate keys .
- Updates the hero attributes .
- Initialize the session .
- Delete hero hero s hero .
- Create a RelationshipInfo instance .
sqlmodel Key Features
sqlmodel Examples and Code Snippets
Lines of Code : 57License : Permissive (MIT)
Copyfrom pydantic import BaseModel, UUID4
class User(BaseModel):
first_name: str
last_name: str
id: UUID4
from uuid import UUID
# from pydantic.dataclasses import dataclass
from dataclasses import dataclass
@dataclass
class User:
fir _____ _
/ ____| |
| (___ | |_ __ _ _ ____ ____ _ _ __ ___
\___ \| __/ _` | '__\ \ /\ / / _` | '__/ __|
____) | || (_| | | \ V V / (_| | | \__ \
|_____/ \__\__ from sqlmodel_basecrud import BaseRepository
class MyCustomRepository(BaseRepository):
def __init__(self, db: Session, model: Type[SQLModel]):
super().__init__(model=model, db=db)
class MyMetaClass:
def __init_subclass__(cls, foo=None):
super().__init_subclass__()
cls.foo = foo
class MyActualClass(MyMetaClass, foo='baz'):
pass
instance = MyActualClass()
print(instance.foo) # "baz"
from datetime import datetime
user_id | friend_id | accepted
-------------------------------------+-----------------------------------------------
google-oauth2|11539665289********** | google-oauth2|11746442253***stmt = select(Friends.user_id, Friends.friend_id).where(
tuple_(Friends.user_id, Friends.friend_id).in_(select(Friends.friend_id, Friends.user_id))
)
@app.post("/users", response_model=schemas.UserOut):
async def ...
class User(SQLModel, table=True):
id: Optional[int] = Field(default=None, primary_key=True)
name: str
icloud_account_id: Optional[int] = Field(default=None, foreign_key="icloudaccount.id")
icloud_account: Optional["ICloudAcdef new_uuid() -> uuid.UUID:
# Note: Work around UUIDs with leading zeros: https://github.com/tiangolo/sqlmodel/issues/25
# by making sure uuid str does not start with a leading 0
val = uuid.uuid4()
while val.hex[0] == 'Community Discussions
Trending Discussions on sqlmodel
QUESTION
I am using the SQLModel library to do a simple select() like described on their official website. However I am getting Column expression or FROM clause expected error message
ANSWER
Answered 2022-Apr-15 at 07:47The error message tells us:
- SQLModel / SQLAlchemy unexpectedly received a module object named
models.Hero - that you have a module named
Hero.py
The import statement from models import Hero only imports the module Hero. Either
- change the import to import the model*
QUESTION
Recently I came across SQLModel package. It combines pydantic and sqlalchemy features to work with database objects.
What I noticed in documentation is that table=True parameter that you use to declare a model class:
ANSWER
Answered 2022-Mar-26 at 10:09This behavior is based on the __init_subclass__ method that you can define in a class used as a metaclass. Look at the following example:
QUESTION
I'm trying to use SQLModel with Fastapi, and on the way I found this example for implementing entities relationships, and I would like to know what does sa_relationship_kwargs={"lazy": "selectin"} means and what does it do?
ANSWER
Answered 2022-Mar-14 at 09:37It chooses the relationship loading technique that SQLAlchemy should use.
The loading of relationships falls into three categories; lazy loading, eager loading, and no loading. Lazy loading refers to objects are returned from a query without the related objects loaded at first. When the given collection or reference is first accessed on a particular object, an additional SELECT statement is emitted such that the requested collection is loaded.
In particular in this case it uses the "select IN loading" technique, which means that a second query will be constructed that loads all child objects through a WHERE parent_id IN (...) construct. Details about the available options:
The primary forms of relationship loading are:
lazy loading - available via
lazy='select'or thelazyload()option, this is the form of loading that emits a SELECT statement at attribute access time to lazily load a related reference on a single object at a time. Lazy loading is detailed at Lazy Loading.joined loading - available via
lazy='joined'or thejoinedload()option, this form of loading applies a JOIN to the given SELECT statement so that related rows are loaded in the same result set. Joined eager loading is detailed at Joined Eager Loading.subquery loading - available via
lazy='subquery'or thesubqueryload()option, this form of loading emits a second SELECT statement which re-states the original query embedded inside of a subquery, then JOINs that subquery to the related table to be loaded to load all members of related collections / scalar references at once. Subquery eager loading is detailed at Subquery Eager Loading.select IN loading - available via
lazy='selectin'or theselectinload()option, this form of loading emits a second (or more) SELECT statement which assembles the primary key identifiers of the parent objects into an IN clause, so that all members of related collections / scalar references are loaded at once by primary key. Select IN loading is detailed at Select IN loading.raise loading - available via
lazy='raise',lazy='raise_on_sql', or the raiseload() option, this form of loading is triggered at the same time a lazy load would normally occur, except it raises an ORM exception in order to guard against the application making unwanted lazy loads. An introduction to raise loading is at Preventing unwanted lazy loads using raiseload.no loading - available via
lazy='noload', or thenoload()option; this loading style turns the attribute into an empty attribute (Noneor[]) that will never load or have any loading effect. This seldom-used strategy behaves somewhat like an eager loader when objects are loaded in that an empty attribute or collection is placed, but for expired objects relies upon the default value of the attribute being returned on access; the net effect is the same except for whether or not the attribute name appears in the InstanceState.unloaded collection. noload may be useful for implementing a “write-only” attribute but this usage is not currently tested or formally supported.
QUESTION
I am using SQLModel in python 3.8
When I add my datetime field created_at: datetime = Field(default_factory=utcnow(), nullable=False)
I get this Error
...ANSWER
Answered 2022-Feb-09 at 09:50This was explained in a comment, but just to add it as an answer for others:
You must import datetime like this
QUESTION
Using SQLModel how to get alembic to recognise the below model?
...ANSWER
Answered 2021-Sep-05 at 13:35There should be info about that in Advanced user guide soon with better explanation than mine but here is how I made Alimbic migrations work.
First of all run alembic init migrations in your console to generate migrations folder. Inside migrations folder should be empty versions subfolder,env.py file, script.py.mako file.
In script.py.mako file we should add line import sqlmodel somewhere around these two lines
QUESTION
I have a database with a table named friends. That table has two columns, "user_id" and "friend_id".
Those are foreign keys from the Users table.
My friends table right now:
...ANSWER
Answered 2022-Feb-16 at 11:05As I said in the comment, without a simple example I can't actually try myself, but I did just have an idea. You might need to modify the subquery syntax a little bit, but I reckon theoretically this could work:
QUESTION
I am using FastApi and My responseModel is being ignored. I am attempting to NOT return the password field in the response. Why does FastApi ignore my responsemodel definition?
Here is my api post method:
...ANSWER
Answered 2022-Feb-05 at 11:29response_model is an argument to the view decorator (since it's metadata about the view itself), not to the view function (which takes arguments that are necessary for how to process the view):
QUESTION
I understand that with Pyodide I can:
A) install a pure Python package via micropip from PyPI or a URL to a .whl file
Example:
...ANSWER
Answered 2022-Jan-21 at 10:05Looks like it should work now.. I see, its added to the officially supported built-in packages.
QUESTION
After working through the tutorial of SQLModel, I don't remember seeing anything on how to implement 1:1 relationships using Relationship attributes.
I found documentation for SQLAlchemy, but it's not immediately clear how this applies to SQLModel.
Code example: How to enforce that User and ICloudAccount have a 1:1 relationship?
...ANSWER
Answered 2022-Jan-19 at 13:23You can turn off the list functionality to allow SQLModel to foreign key as a one-to-one. You do this with the SQLalchemy keyword uselist
QUESTION
I'm using FastAPI & SQLModel to insert data into SQLite database (I'm posting a few fields, then SQLModel adds UUID and datetime fields and inserts into db).
While posting data to FastAPI, I occasionally get ValueError:
...ANSWER
Answered 2021-Dec-10 at 12:03I think you need to do a str(uuid.uuid4()) in default factory
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Install sqlmodel
You can use sqlmodel like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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