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|| z"RowProxy.items.. s" 888Sd3i 888r )keysr& s `r itemszRowProxy.items s' 9888DIIKK8888r c | j j S )zReturn the list of keys as strings represented by this
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)iterr r} r& s r iterkeyszRowProxy.iterkeys s DL%&&&r c t | S )zReturn a an iterator against the :meth:`.RowProxy.values` method.
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r c ^ j j |rE|rC|sA|t k r.d |D | _ fdt | D S |r| | }n0|r| | }n| }fd|D S )a Merge a cursor.description with compiled result column information.
There are at least four separate strategies used here, selected
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which generated the column names present in the raw SQL string and
which has the identical number of columns as were reported by
cursor.description. In this case, we assume a 1-1 positional mapping
between the entries in cursor.description and the compiled object.
This is also the most performant case as we disregard extracting /
decoding the column names present in cursor.description since we
already have the desired name we generated in the compiled SQL
construct.
The next common case is that of the completely raw string SQL,
such as passed to connection.execute(). In this case we have no
compiled construct to work with, so we extract and decode the
names from cursor.description and index those as the primary
result row target keys.
The remaining fairly common case is that of the textual SQL
that includes at least partial column information; this is when
we use a :class:`.TextAsFrom` construct. This construct may have
unordered or ordered column information. In the ordered case, we
merge the cursor.description and the compiled construct's information
positionally, and warn if there are additional description names
present, however we still decode the names in cursor.description
as we don't have a guarantee that the names in the columns match
on these. In the unordered case, we match names in cursor.description
to that of the compiled construct based on name matching.
In both of these cases, the cursor.description names and the column
expression objects and names are indexed as result row target keys.
The final case is much less common, where we have a compiled
non-textual SQL expression construct, but the number of columns
in cursor.description doesn't match what's in the compiled
construct. We make the guess here that there might be textual
column expressions in the compiled construct that themselves include
a comma in them causing them to split. We do the same name-matching
as with textual non-ordered columns.
The name-matched system of merging is the same as that used by
SQLAlchemy for all cases up through te 0.9 series. Positional
matching for compiled SQL expressions was introduced in 1.0 as a
major performance feature, and positional matching for textual
:class:`.TextAsFrom` objects in 1.1. As name matching is no longer
a common case, it was acceptable to factor it into smaller generator-
oriented methods that are easier to understand, but incur slightly
more performance overhead.
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\ }}d d |f||< |d | _ |d | _ |d | _ d S )Nc g | ]}d S r rO r{ _s r r| z/ResultMetaData.__setstate__.. s DDDQDDDDr r} r r r )ranger1 r r r~ r} r r )r r
r! r= r> s r r zResultMetaData.__setstate__ s ED%E&M0B0B*C*CDDD "" v 1288:: . .JC u-F3KK&M #$4 5 $%6 7 r NT)rK rL rM r rN r" r r r r r classmethodr r6 rT r r% r rO r r r r s Iw w wr} } }~(6 (6 (6T H H HDH H H,O O O ["2 2 2 2hD D D * * * *(
8 8 8 8 8r r c p e Zd ZdZeZdZdZdZdZ dZ
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Zed Zed Zed
Zd Zd Zd Zd Zd ZeZ ej d Z d Z d Z ed Z d Z!d Z"d Z#d Z$d Z%d Z&d'd Z'd Z(d'd Z)d Z*d! Z+d'd"Z,d# Z-d$ Z.d% Z/dS )( ResultProxyax A facade around a DBAPI cursor object.
Returns database rows via the :class:`.RowProxy` class, which provides
additional API features and behaviors on top of the raw data returned
by the DBAPI.
.. seealso::
:ref:`coretutorial_selecting` - introductory material for accessing
:class:`_engine.ResultProxy` and :class:`.RowProxy` objects.
NFc || _ |j | _ |j x| _ | _ |j | _ | j j o|j | _ | d S r )
r r cursor
_saved_cursorroot_connection
connection_echoengine_should_log_debug_init_metadata)r r s r r" zResultProxy.__init__ si +2>9 d(!1 O ! Hgn&F&F&H&H
r Tc | j j } ||| S # t $ r }| d | cY d }~S d }~ww xY wr ) _metadatar rF _non_result)r r= r getterr? s r r zResultProxy._getter sk )^+F 6#x(( ( / / /##D#.. . . . . . . /s
A?AAc | j j } || S # t $ r }| d | cY d }~S d }~ww xY wr )r rT rF r )r r= rx r? s r rT zResultProxy._has_key sg n-G 73<< / / /##D#.. . . . . . . /s
A>AAc | }|| j j r]d| j j v rO| j j j r| j j j | _ n.* s& #E#EQAaD#E#E#E#E#E#Er ) _cursor_descriptionr compiledexecution_options_cached_metadatar r r r loggerdebugr; )r r s r r zResultProxy._init_metadata s ! 5 5 7 7 ) %
J$ (FFF<(9 A%)\%:%KDNN 't-?@@ADN ->> "06H!I!Iz
#*00 e#E#E2D#E#E#E E E * )
r c , | j r | j j S g S )zYReturn the list of string keys that would represented by each
:class:`.RowProxy`.)r r} r& s r r} zResultProxy.keys- s > >& &Ir c | j j S # t $ r3}| j |dd| j | j Y d}~dS d}~ww xY w)a Return the 'rowcount' for this result.
The 'rowcount' reports the number of rows *matched*
by the WHERE criterion of an UPDATE or DELETE statement.
.. note::
Notes regarding :attr:`_engine.ResultProxy.rowcount`:
* This attribute returns the number of rows *matched*,
which is not necessarily the same as the number of rows
that were actually *modified* - an UPDATE statement, for example,
may have no net change on a given row if the SET values
given are the same as those present in the row already.
Such a row would be matched but not modified.
On backends that feature both styles, such as MySQL,
rowcount is configured by default to return the match
count in all cases.
* :attr:`_engine.ResultProxy.rowcount`
is *only* useful in conjunction
with an UPDATE or DELETE statement. Contrary to what the Python
DBAPI says, it does *not* return the
number of rows available from the results of a SELECT statement
as DBAPIs cannot support this functionality when rows are
unbuffered.
* :attr:`_engine.ResultProxy.rowcount`
may not be fully implemented by
all dialects. In particular, most DBAPIs do not support an
aggregate rowcount result from an executemany call.
The :meth:`_engine.ResultProxy.supports_sane_rowcount` and
:meth:`_engine.ResultProxy.supports_sane_multi_rowcount` methods
will report from the dialect if each usage is known to be
supported.
* Statements that use RETURNING may not return a correct
rowcount.
N)r rowcount
BaseExceptionr _handle_dbapi_exceptionr r rI s r r zResultProxy.rowcount6 sy V <( ( O 3 34t{DL
A (AA c | j j S # t $ r3}| j |dd| j | j Y d}~dS d}~ww xY w)a/ Return the 'lastrowid' accessor on the DBAPI cursor.
This is a DBAPI specific method and is only functional
for those backends which support it, for statements
where it is appropriate. It's behavior is not
consistent across backends.
Usage of this method is normally unnecessary when
using insert() expression constructs; the
:attr:`~ResultProxy.inserted_primary_key` attribute provides a
tuple of primary key values for a newly inserted row,
regardless of database backend.
N)r lastrowidr r r r r s r r zResultProxy.lastrowidh sz %/ / O 3 34t 14<
r c | j duS )zTrue if this :class:`_engine.ResultProxy` returns rows.
I.e. if it is legal to call the methods
:meth:`_engine.ResultProxy.fetchone`,
:meth:`_engine.ResultProxy.fetchmany`
:meth:`_engine.ResultProxy.fetchall`.
N)r r& s r returns_rowszResultProxy.returns_rows s ~T))r c | j j S )ak True if this :class:`_engine.ResultProxy` is the result
of a executing an expression language compiled
:func:`_expression.insert` construct.
When True, this implies that the
:attr:`inserted_primary_key` attribute is accessible,
assuming the statement did not include
a user defined "returning" construct.
)r isinsertr& s r is_insertzResultProxy.is_insert s |$$r c | j j S )z May be overridden by subclasses.)r descriptionr& s r r z ResultProxy._cursor_description s !--r c | j rdS d| _ | j }| j | | j r| j d| _ dS )az Soft close this :class:`_engine.ResultProxy`.
This releases all DBAPI cursor resources, but leaves the
ResultProxy "open" from a semantic perspective, meaning the
fetchXXX() methods will continue to return empty results.
This method is called automatically when:
* all result rows are exhausted using the fetchXXX() methods.
* cursor.description is None.
This method is **not public**, but is documented in order to clarify
the "autoclose" process used.
.. versionadded:: 1.0.0
.. seealso::
:meth:`_engine.ResultProxy.close`
NT) _soft_closedr r _safe_close_cursor_autoclose_connectionclose)r r s r _soft_closezResultProxy._soft_close sc . F **6222 % $ O ! ! # # # r c N | j s | d| _ dS dS )a Close this ResultProxy.
This closes out the underlying DBAPI cursor corresponding
to the statement execution, if one is still present. Note that the
DBAPI cursor is automatically released when the
:class:`_engine.ResultProxy`
exhausts all available rows. :meth:`_engine.ResultProxy.close`
is generally
an optional method except in the case when discarding a
:class:`_engine.ResultProxy`
that still has additional rows pending for fetch.
In the case of a result that is the product of
:ref:`connectionless execution `,
the underlying :class:`_engine.Connection` object is also closed,
which
:term:`releases` DBAPI connection resources.
After this method is called, it is no longer valid to call upon
the fetch methods, which will raise a :class:`.ResourceClosedError`
on subsequent use.
.. versionchanged:: 1.0.0 - the :meth:`_engine.ResultProxy.close`
method
has been separated out from the process that releases the underlying
DBAPI cursor resource. The "auto close" feature of the
:class:`_engine.Connection` now performs a so-called "soft close",
which
releases the underlying DBAPI cursor, but allows the
:class:`_engine.ResultProxy`
to still behave as an open-but-exhausted
result set; the actual :meth:`_engine.ResultProxy.close`
method is never
called. It is still safe to discard a
:class:`_engine.ResultProxy`
that has been fully exhausted without calling this method.
.. seealso::
:ref:`connections_toplevel`
TN)closedr* r& s r r) zResultProxy.close s6 X { DKKK r c # B K | }|dS |V )z Implement iteration protocol.TN)fetchoner r s r r/ zResultProxy.__iter__ s0 --//C{ r c N | }|t |S )zImplement the Python next() protocol.
This method, mirrored as both ``.next()`` and ``.__next__()``, is part
of Python's API for producing iterator-like behavior.
.. versionadded:: 1.2
)r.
StopIterationr/ s r __next__zResultProxy.__next__ s% mmoo ; // !Jr c | j j st j d | j j st j d | j j rt j d | j j S )a Return the primary key for the row just inserted.
The return value is a list of scalar values
corresponding to the list of primary key columns
in the target table.
This only applies to single row :func:`_expression.insert`
constructs which did not explicitly specify
:meth:`_expression.Insert.returning`.
Note that primary key columns which specify a
server_default clause,
or otherwise do not qualify as "autoincrement"
columns (see the notes at :class:`_schema.Column`), and were
generated using the database-side default, will
appear in this list as ``None`` unless the backend
supports "returning" and the insert statement executed
with the "implicit returning" enabled.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an insert() construct.
1Statement is not a compiled expression construct.2Statement is not an insert() expression construct.z9Can't call inserted_primary_key when returning() is used.)r r r r< r! _is_explicit_returninginserted_primary_keyr& s r r7 z ResultProxy.inserted_primary_key s 6 |$
)F
& )G
\
0 )
|00r c | j j st j d | j j st j d | j j r | j j S | j j d S )a Return the collection of updated parameters from this
execution.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an update() construct.
r4 z2Statement is not an update() expression construct.r )r r r r< isupdate executemanycompiled_parametersr& s r last_updated_paramsz ResultProxy.last_updated_params5 z |$ 7)F
& 7)G
\
% 7<3 3<3A6 6r c | j j st j d | j j st j d | j j r | j j S | j j d S )a Return the collection of inserted parameters from this
execution.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an insert() construct.
r4 r5 r )r r r r< r! r: r; r& s r last_inserted_paramsz ResultProxy.last_inserted_paramsK r= r c | j j S )a Return the values of default columns that were fetched using
the :meth:`.ValuesBase.return_defaults` feature.
The value is an instance of :class:`.RowProxy`, or ``None``
if :meth:`.ValuesBase.return_defaults` was not used or if the
backend does not support RETURNING.
.. versionadded:: 0.9.0
.. seealso::
:meth:`.ValuesBase.return_defaults`
)r returned_defaultsr& s r rA z ResultProxy.returned_defaultsa s |--r c 4 | j S )zReturn ``lastrow_has_defaults()`` from the underlying
:class:`.ExecutionContext`.
See :class:`.ExecutionContext` for details.
)r lastrow_has_defaultsr& s r rC z ResultProxy.lastrow_has_defaultss s |00222r c | j j st j d | j j s | j j st j d | j j S )aM Return ``postfetch_cols()`` from the underlying
:class:`.ExecutionContext`.
See :class:`.ExecutionContext` for details.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an insert() or update() construct.
r4 >Statement is not an insert() or update() expression construct.)r r r r< r! r9 postfetch_colsr& s r rF zResultProxy.postfetch_cols} sk |$ )F
& t|/D )(
|**r c | j j st j d | j j s | j j st j d | j j S )aL Return ``prefetch_cols()`` from the underlying
:class:`.ExecutionContext`.
See :class:`.ExecutionContext` for details.
Raises :class:`~sqlalchemy.exc.InvalidRequestError` if the executed
statement is not a compiled expression construct
or is not an insert() or update() construct.
r4 rE )r r r r< r! r9
prefetch_colsr& s r rH zResultProxy.prefetch_cols sk |$ )F
& t|/D )(
|))r c | j j S )zReturn ``supports_sane_rowcount`` from the dialect.
See :attr:`_engine.ResultProxy.rowcount` for background.
)r supports_sane_rowcountr& s r rJ z"ResultProxy.supports_sane_rowcount s |22r c | j j S )zReturn ``supports_sane_multi_rowcount`` from the dialect.
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)r supports_sane_multi_rowcountr& s r rL z(ResultProxy.supports_sane_multi_rowcount s |88r c | j S # t $ r }| d | cY d }~S d }~ww xY wr )r r. rF r r r? s r _fetchone_implzResultProxy._fetchone_impl s_ /;'')) ) / / /##D#.. . . . . . . /
AA A Ac || j S | j | S # t $ r }| g | cY d }~S d }~ww xY wr )r fetchmanyrF r )r sizer? s r _fetchmany_implzResultProxy._fetchmany_impl sz -|{,,...{,,T222 - - -##B,, , , , , , , -s 7 7
A!A A! A!c | j S # t $ r }| g | cY d }~S d }~ww xY wr )r fetchallrF r rN s r _fetchall_implzResultProxy._fetchall_impl s_ -;'')) ) - - -##B,, , , , , , , -rP c | j *t j t j d | d S | j r*t j t j d | d S |S )NzJThis result object does not return rows. It has been closed automatically.rC z This result object is closed.)r r rE r ResourceClosedErrorr, )r defaultr? s r r zResultProxy._non_result s > ! K'8 !$
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r c | | }| |S # t $ r3}| j |dd| j | j Y d}~dS d}~ww xY w)a Fetch all rows, just like DB-API ``cursor.fetchall()``.
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discarded.
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an empty list. After the :meth:`_engine.ResultProxy.close` method is
called, the method will raise :class:`.ResourceClosedError`.
:return: a list of :class:`.RowProxy` objects
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A/(A**A/3 B< <Cc B | }||d S dS )a) Fetch the first column of the first row, and close the result set.
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xZ S )BufferedRowResultProxya A ResultProxy with row buffering behavior.
``ResultProxy`` that buffers the contents of a selection of rows
before ``fetchone()`` is called. This is to allow the results of
``cursor.description`` to be available immediately, when
interfacing with a DB-API that requires rows to be consumed before
this information is available (currently psycopg2, when used with
server-side cursors).
The pre-fetching behavior fetches only one row initially, and then
grows its buffer size by a fixed amount with each successive need
for additional rows up to a size of 1000.
The size argument is configurable using the ``max_row_buffer``
execution option::
with psycopg2_engine.connect() as conn:
result = conn.execution_options(
stream_results=True, max_row_buffer=50
).execute("select * from table")
.. versionadded:: 1.0.6 Added the ``max_row_buffer`` option.
.. seealso::
:ref:`psycopg2_execution_options`
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FullyBufferedResultProxyzA result proxy that buffers rows fully upon creation.
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r r c 4 e Zd ZdZeZ fdZd ZddZ xZ S )BufferedColumnResultProxya A ResultProxy with column buffering behavior.
``ResultProxy`` that loads all columns into memory each time
fetchone() is called. If fetchmany() or fetchall() are called,
the full grid of results is fetched. This is to operate with
databases where result rows contain "live" results that fall out
of scope unless explicitly fetched.
.. versionchanged:: 1.2 This :class:`_engine.ResultProxy` is not used by
any SQLAlchemy-included dialects.
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