o
    g<0                     @   s   d Z ddlZddlmZ ddlmZ ddlmZ ddlm	Z	 dd	l
mZ dd
l
mZ ddlmZ ddlmZ ddlmZ G dd dZG dd deZG dd deZG dd deZG dd dZG dd deZG dd de	ZeZdS )a]
  

.. dialect:: sqlite+aiosqlite
    :name: aiosqlite
    :dbapi: aiosqlite
    :connectstring: sqlite+aiosqlite:///file_path
    :url: https://pypi.org/project/aiosqlite/

The aiosqlite dialect provides support for the SQLAlchemy asyncio interface
running on top of pysqlite.

aiosqlite is a wrapper around pysqlite that uses a background thread for
each connection.   It does not actually use non-blocking IO, as SQLite
databases are not socket-based.  However it does provide a working asyncio
interface that's useful for testing and prototyping purposes.

Using a special asyncio mediation layer, the aiosqlite dialect is usable
as the backend for the :ref:`SQLAlchemy asyncio <asyncio_toplevel>`
extension package.

This dialect should normally be used only with the
:func:`_asyncio.create_async_engine` engine creation function::

    from sqlalchemy.ext.asyncio import create_async_engine

    engine = create_async_engine("sqlite+aiosqlite:///filename")

The URL passes through all arguments to the ``pysqlite`` driver, so all
connection arguments are the same as they are for that of :ref:`pysqlite`.

.. _aiosqlite_udfs:

User-Defined Functions
----------------------

aiosqlite extends pysqlite to support async, so we can create our own user-defined functions (UDFs)
in Python and use them directly in SQLite queries as described here: :ref:`pysqlite_udfs`.

.. _aiosqlite_serializable:

Serializable isolation / Savepoints / Transactional DDL (asyncio version)
-------------------------------------------------------------------------

Similarly to pysqlite, aiosqlite does not support SAVEPOINT feature.

The solution is similar to :ref:`pysqlite_serializable`. This is achieved by the event listeners in async::

    from sqlalchemy import create_engine, event
    from sqlalchemy.ext.asyncio import create_async_engine

    engine = create_async_engine("sqlite+aiosqlite:///myfile.db")


    @event.listens_for(engine.sync_engine, "connect")
    def do_connect(dbapi_connection, connection_record):
        # disable aiosqlite's emitting of the BEGIN statement entirely.
        # also stops it from emitting COMMIT before any DDL.
        dbapi_connection.isolation_level = None


    @event.listens_for(engine.sync_engine, "begin")
    def do_begin(conn):
        # emit our own BEGIN
        conn.exec_driver_sql("BEGIN")

.. warning:: When using the above recipe, it is advised to not use the
   :paramref:`.Connection.execution_options.isolation_level` setting on
   :class:`_engine.Connection` and :func:`_sa.create_engine`
   with the SQLite driver,
   as this function necessarily will also alter the ".isolation_level" setting.

    N)deque)partial   )SQLiteExecutionContext)SQLiteDialect_pysqlite   )pool)util)AdaptedConnection)await_fallback)
await_onlyc                   @   s`   e Zd ZdZdZdd Zdd Zddd	Zd
d Zdd Z	dd Z
dd ZdddZdd ZdS )AsyncAdapt_aiosqlite_cursor)_adapt_connection_connectiondescriptionawait__rows	arraysizerowcount	lastrowidFc                 C   s4   || _ |j| _|j| _d| _d| _d | _t | _d S )Nr   )r   r   r   r   r   r   r   r   )selfadapt_connection r   f/var/www/html/ecg_monitoring/venv/lib/python3.10/site-packages/sqlalchemy/dialects/sqlite/aiosqlite.py__init__q   s   z$AsyncAdapt_aiosqlite_cursor.__init__c                 C   s   | j   d S N)r   clearr   r   r   r   closez      z!AsyncAdapt_aiosqlite_cursor.closeNc              
   C   s   zW|  | j }|d u r|  || n	|  ||| |jr:|j| _d | _| _| js9t|  |	 | _
nd | _|j| _|j| _| jsR|  |  W d S || _W d S  typ } z| j| W Y d }~d S d }~ww )Nr   )r   r   cursorexecuter   r   r   server_sider   fetchallr   r   _cursor	Exceptionr   _handle_exception)r   	operation
parametersr%   errorr   r   r   r"   }   s*   z#AsyncAdapt_aiosqlite_cursor.executec              
   C   s   z&|  | j }|  ||| d | _|j| _|j| _|  |  W d S  ty? } z| j	
| W Y d }~d S d }~ww r   )r   r   r!   executemanyr   r   r   r   r&   r   r'   )r   r(   seq_of_parametersr%   r*   r   r   r   r+      s   z'AsyncAdapt_aiosqlite_cursor.executemanyc                 G   s   d S r   r   )r   
inputsizesr   r   r   setinputsizes   s   z)AsyncAdapt_aiosqlite_cursor.setinputsizesc                 c   s"    | j r| j  V  | j sd S d S r   r   popleftr   r   r   r   __iter__   s   z$AsyncAdapt_aiosqlite_cursor.__iter__c                 C   s   | j r| j  S d S r   r/   r   r   r   r   fetchone   s   
z$AsyncAdapt_aiosqlite_cursor.fetchonec                    s4   |d u r| j }| j  fddtt|t D S )Nc                    s   g | ]}   qS r   )r0   ).0_rrr   r   
<listcomp>   s    z9AsyncAdapt_aiosqlite_cursor.fetchmany.<locals>.<listcomp>)r   r   rangeminlenr   sizer   r5   r   	fetchmany   s    z%AsyncAdapt_aiosqlite_cursor.fetchmanyc                 C   s   t | j}| j  |S r   )listr   r   )r   retvalr   r   r   r$      s   

z$AsyncAdapt_aiosqlite_cursor.fetchallr   )__name__
__module____qualname__	__slots__r#   r   r   r"   r+   r.   r1   r2   r=   r$   r   r   r   r   r   `   s    	

r   c                       sF   e Zd ZdZdZ fddZdd Zdd Zdd
dZdd Z	  Z
S )AsyncAdapt_aiosqlite_ss_cursorr%   Tc                    s   t  j|i | d | _d S r   )superr   r%   )r   argkw	__class__r   r   r      s   
z'AsyncAdapt_aiosqlite_ss_cursor.__init__c                 C   s(   | j d ur| | j   d | _ d S d S r   )r%   r   r   r   r   r   r   r      s   

z$AsyncAdapt_aiosqlite_ss_cursor.closec                 C      |  | j S r   )r   r%   r2   r   r   r   r   r2         z'AsyncAdapt_aiosqlite_ss_cursor.fetchoneNc                 C   s"   |d u r| j }| | jj|dS )N)r<   )r   r   r%   r=   r;   r   r   r   r=      s   z(AsyncAdapt_aiosqlite_ss_cursor.fetchmanyc                 C   rJ   r   )r   r%   r$   r   r   r   r   r$      rK   z'AsyncAdapt_aiosqlite_ss_cursor.fetchallr   )r@   rA   rB   rC   r#   r   r   r2   r=   r$   __classcell__r   r   rH   r   rD      s    
rD   c                   @   st   e Zd ZeeZdZdd Zedd Z	e	j
dd Z	dd Zdd
dZdd Zdd Zdd Zdd Zdd ZdS )AsyncAdapt_aiosqlite_connection)dbapic                 C   s   || _ || _d S r   )rN   r   )r   rN   
connectionr   r   r   r      s   
z(AsyncAdapt_aiosqlite_connection.__init__c                 C   s   | j jS r   )r   isolation_levelr   r   r   r   rP      s   z/AsyncAdapt_aiosqlite_connection.isolation_levelc              
   C   st   dd }t || jj|}t  }| jj||f z| |W S  t	y9 } z| 
| W Y d }~d S d }~ww )Nc                 S   s
   || _ d S r   )rP   )rO   valuer   r   r   set_iso   s   
z@AsyncAdapt_aiosqlite_connection.isolation_level.<locals>.set_iso)r   r   _connasyncioget_event_loopcreate_future_tx
put_nowaitr   r&   r'   )r   rQ   rR   functionfuturer*   r   r   r   rP      s   c              
   O   sP   z|  | jj|i | W d S  ty' } z| | W Y d }~d S d }~ww r   )r   r   create_functionr&   r'   )r   argsrG   r*   r   r   r   r[      s   z/AsyncAdapt_aiosqlite_connection.create_functionFc                 C   s   |rt | S t| S r   )rD   r   )r   r#   r   r   r   r!      s   z&AsyncAdapt_aiosqlite_connection.cursorc                 O   s   |  | jj|i |S r   )r   r   r"   )r   r\   rG   r   r   r   r"     s   z'AsyncAdapt_aiosqlite_connection.executec              
   C   H   z|  | j  W d S  ty# } z| | W Y d }~d S d }~ww r   )r   r   rollbackr&   r'   r   r*   r   r   r   r^        z(AsyncAdapt_aiosqlite_connection.rollbackc              
   C   r]   r   )r   r   commitr&   r'   r_   r   r   r   ra     r`   z&AsyncAdapt_aiosqlite_connection.commitc              
   C   sZ   z|  | j  W d S  ty   Y d S  ty, } z| | W Y d }~d S d }~ww r   )r   r   r   
ValueErrorr&   r'   r_   r   r   r   r     s   	z%AsyncAdapt_aiosqlite_connection.closec                 C   s,   t |tr|jd dkr| jjd||)Nr   no active connection)
isinstancerb   r\   rN   sqliteOperationalErrorr_   r   r   r   r'   $  s   z1AsyncAdapt_aiosqlite_connection._handle_exceptionN)F)r@   rA   rB   staticmethodr   r   rC   r   propertyrP   setterr[   r!   r"   r^   ra   r   r'   r   r   r   r   rM      s    


rM   c                   @   s   e Zd ZdZeeZdS )'AsyncAdaptFallback_aiosqlite_connectionr   N)r@   rA   rB   rC   rg   r   r   r   r   r   r   rj   0  s    rj   c                   @   s$   e Zd Zdd Zdd Zdd ZdS )AsyncAdapt_aiosqlite_dbapic                 C   s   || _ || _d| _|   d S )Nqmark)	aiosqlitere   
paramstyle_init_dbapi_attributes)r   rm   re   r   r   r   r   7  s   z#AsyncAdapt_aiosqlite_dbapi.__init__c                 C   s^   dD ]}t | |t| j| qdD ]}t | |t| j| qdD ]}t | |t| j| q d S )N)DatabaseErrorErrorIntegrityErrorNotSupportedErrorrf   ProgrammingErrorsqlite_versionsqlite_version_info)PARSE_COLNAMESPARSE_DECLTYPES)Binary)setattrgetattrrm   re   )r   namer   r   r   ro   =  s   
z1AsyncAdapt_aiosqlite_dbapi._init_dbapi_attributesc                 O   sj   | dd}| dd }|r||i |}n| jj|i |}d|_t|r.t| t|S t| t	|S )Nasync_fallbackFasync_creator_fnT)
poprm   connectdaemonr	   asboolrj   r   rM   r   )r   rF   rG   r}   
creator_fnrO   r   r   r   r   P  s   
z"AsyncAdapt_aiosqlite_dbapi.connectN)r@   rA   rB   r   ro   r   r   r   r   r   rk   6  s    rk   c                   @   s   e Zd Zdd ZdS ) SQLiteExecutionContext_aiosqlitec                 C   s   | j jddS )NT)r#   )_dbapi_connectionr!   r   r   r   r   create_server_side_cursorh  r    z:SQLiteExecutionContext_aiosqlite.create_server_side_cursorN)r@   rA   rB   r   r   r   r   r   r   g  s    r   c                       sP   e Zd ZdZdZdZdZeZe	dd Z
e	dd Z fddZd	d
 Z  ZS )SQLiteDialect_aiosqliterm   Tc                 C   s   t tdtdS )Nrm   sqlite3)rk   
__import__)clsr   r   r   import_dbapiv  s   z$SQLiteDialect_aiosqlite.import_dbapic                 C   s   |  |rtjS tjS r   )_is_url_file_dbr   NullPool
StaticPool)r   urlr   r   r   get_pool_class|  s   
z&SQLiteDialect_aiosqlite.get_pool_classc                    s.   t || jjrdt|v rdS t |||S )Nrc   T)rd   rN   rf   strrE   is_disconnect)r   erO   r!   rH   r   r   r     s   z%SQLiteDialect_aiosqlite.is_disconnectc                 C   s   |j S r   )r   )r   rO   r   r   r   get_driver_connection  s   z-SQLiteDialect_aiosqlite.get_driver_connection)r@   rA   rB   driversupports_statement_cacheis_asyncsupports_server_side_cursorsr   execution_ctx_clsclassmethodr   r   r   r   rL   r   r   rH   r   r   l  s    

r   )__doc__rT   collectionsr   	functoolsr   baser   pysqliter    r   r	   enginer
   util.concurrencyr   r   r   rD   rM   rj   rk   r   r   dialectr   r   r   r   <module>   s&   	I]W1#