sqlalchemy.sql schema Example Code

schema is a callable within the sqlalchemy.sql module of the SQLAlchemy project.

ClauseElement, Select, column, expression, extract, functions, operators, select, sqltypes, and table are several other callables with code examples from the same sqlalchemy.sql package.

Example 1 from GINO

GINO (project documentation and PyPI package information) is an object-relational mapper (ORM) built on SQLAlchemy that is non-blocking and therefore designed to work properly with asynchronously-run code, for example, an application written with asyncio.

GINO is open sourced under the BSD License.

GINO / src/gino / engine.py

# engine.py
import asyncio
import collections
import functools
import sys
import time
from contextvars import ContextVar

from sqlalchemy.cutils import _distill_params
from sqlalchemy.engine import Engine, Connection
from sqlalchemy.sql import schema

from .aiocontextvars import patch_asyncio
from .exceptions import MultipleResultsFound, NoResultFound
from .transaction import GinoTransaction

patch_asyncio()


class _BaseDBAPIConnection:
    _reset_agent = None
    gino_conn = None

    def __init__(self, cursor_cls):
        self._cursor_cls = cursor_cls
        self._closed = False

    def commit(self):
        pass

    def cursor(self):
        return self._cursor_cls(self)

    @property
    def raw_connection(self):


## ... source file abbreviated to get to schema examples ...


        self._tx_ctx = args

    async def __aenter__(self):
        conn = await self._conn_ctx.__aenter__()
        try:
            args, kwargs = self._tx_ctx
            self._tx_ctx = conn.transaction(*args, **kwargs)
            return await self._tx_ctx.__aenter__()
        except Exception:
            await self._conn_ctx.__aexit__(*sys.exc_info())
            raise

    async def __aexit__(self, *exc_info):
        try:
            tx, self._tx_ctx = self._tx_ctx, None
            return await tx.__aexit__(*exc_info)
        except Exception:
            exc_info = sys.exc_info()
            raise
        finally:
            await self._conn_ctx.__aexit__(*exc_info)


class GinoConnection:

    schema_for_object = schema._schema_getter(None)

    def __init__(self, dialect, sa_conn, stack=None):
        self._dialect = dialect
        self._sa_conn = sa_conn
        self._stack = stack

    @property
    def _dbapi_conn(self):
        return self._sa_conn.connection

    @property
    def raw_connection(self):
        return self._dbapi_conn.raw_connection

    async def get_raw_connection(self, *, timeout=None):
        return await self._dbapi_conn.acquire(timeout=timeout)

    async def release(self, *, permanent=True):
        if permanent and self._stack is not None:
            dbapi_conn = self._stack.remove(lambda x: x.gino_conn is self)
            if dbapi_conn:
                await dbapi_conn.release(True)
            else:
                raise ValueError("This connection is already released.")


## ... source file continues with no further schema examples...

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