Current File : //proc/self/root/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyo
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� � Z d e f d � � YZ d S( s� Provides an abstraction for obtaining database schema information.
Usage Notes:
Here are some general conventions when accessing the low level inspector
methods such as get_table_names, get_columns, etc.
1. Inspector methods return lists of dicts in most cases for the following
reasons:
* They're both standard types that can be serialized.
* Using a dict instead of a tuple allows easy expansion of attributes.
* Using a list for the outer structure maintains order and is easy to work
with (e.g. list comprehension [d['name'] for d in cols]).
2. Records that contain a name, such as the column name in a column record
use the key 'name'. So for most return values, each record will have a
'name' attribute..
i ( t Connectablei ( t exc( t
inspection( t sql( t util( t operators( t schema( t
TypeEngine( t
deprecated( t topologicalc O s� | j d d � } | d k r1 | | | | | � S| j t d � | D� � t d � | j � D� � f } | j | � } | d k r� | | | | | � } | | | <n | S( Nt
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t kt v( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pys <genexpr>1 s ( t gett Nonet __name__t tuplet items( t fnt selft cont argst kwR
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t Inspectorc B s� e Z d Z d � Z e d � � Z e j e � d � � Z e
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� Z d( d � Z d( d � Z d( d � Z e d d � d( d � � Z d( d � Z d( d � Z d( d � Z d( d � Z d( d � Z d( d � Z d) e d( d � Z! d � Z" d � Z# d � Z$ d � Z% d e& j' f d e& j( f d! e& j) f d" e& j* f g Z+ d# � Z, d$ � Z- d% � Z. d& � Z/ RS(* sm Performs database schema inspection.
The Inspector acts as a proxy to the reflection methods of the
:class:`~sqlalchemy.engine.interfaces.Dialect`, providing a
consistent interface as well as caching support for previously
fetched metadata.
A :class:`.Inspector` object is usually created via the
:func:`.inspect` function::
from sqlalchemy import inspect, create_engine
engine = create_engine('...')
insp = inspect(engine)
The inspection method above is equivalent to using the
:meth:`.Inspector.from_engine` method, i.e.::
engine = create_engine('...')
insp = Inspector.from_engine(engine)
Where above, the :class:`~sqlalchemy.engine.interfaces.Dialect` may opt
to return an :class:`.Inspector` subclass that provides additional
methods specific to the dialect's target database.
c C sn | | _ t | d � r' | j | _ n | | _ | j | k rR | j � j � n | j j | _ i | _ d S( sj Initialize a new :class:`.Inspector`.
:param bind: a :class:`~sqlalchemy.engine.Connectable`,
which is typically an instance of
:class:`~sqlalchemy.engine.Engine` or
:class:`~sqlalchemy.engine.Connection`.
For a dialect-specific instance of :class:`.Inspector`, see
:meth:`.Inspector.from_engine`
t engineN( t bindt hasattrR! t connectt closet dialectR
( R R" ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyt __init__X s
c C s, t | j d � r" | j j | � St | � S( s� Construct a new dialect-specific Inspector object from the given
engine or connection.
:param bind: a :class:`~sqlalchemy.engine.Connectable`,
which is typically an instance of
:class:`~sqlalchemy.engine.Engine` or
:class:`~sqlalchemy.engine.Connection`.
This method differs from direct a direct constructor call of
:class:`.Inspector` in that the
:class:`~sqlalchemy.engine.interfaces.Dialect` is given a chance to
provide a dialect-specific :class:`.Inspector` instance, which may
provide additional methods.
See the example at :class:`.Inspector`.
t inspector( R# R& R( R ( t clsR" ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyt from_enginet s c C s
t j | � S( N( R R* ( R" ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyt _insp� s c C s
| j j S( s� Return the default schema name presented by the dialect
for the current engine's database user.
E.g. this is typically ``public`` for PostgreSQL and ``dbo``
for SQL Server.
( R& t default_schema_name( R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyR, � s c C s2 t | j d � r. | j j | j d | j �Sg S( s! Return all schema names.
t get_schema_namesR
( R# R& R- R" R
( R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyR- � s t order_bys 1.0s� The :paramref:`get_table_names.order_by` parameter is deprecated and will be removed in a future release. Please refer to :meth:`.Inspector.get_sorted_table_and_fkc_names` for a more comprehensive solution to resolving foreign key cycles between tables.c C s� t | j d � r6 | j j | j | d | j �} n | j j | � } | d k r� g } xU | D]M } xD | j | | � D]0 } | | d k rz | j | d | f � qz qz Wqa Wt t
j | | � � } n | S( s� Return all table names in referred to within a particular schema.
The names are expected to be real tables only, not views.
Views are instead returned using the :meth:`.Inspector.get_view_names`
method.
:param schema: Schema name. If ``schema`` is left at ``None``, the
database's default schema is
used, else the named schema is searched. If the database does not
support named schemas, behavior is undefined if ``schema`` is not
passed as ``None``. For special quoting, use :class:`.quoted_name`.
:param order_by: Optional, may be the string "foreign_key" to sort
the result on foreign key dependencies. Does not automatically
resolve cycles, and will raise :class:`.CircularDependencyError`
if cycles exist.
.. seealso::
:meth:`.Inspector.get_sorted_table_and_fkc_names`
:attr:`.MetaData.sorted_tables`
t get_table_namesR
t foreign_keyt referred_table( R# R& R/ R" R
R! t table_namest get_foreign_keyst appendt listR t sort( R R R. t tnamest tuplest tnamet fkey( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyR/ � s %
"c s� t | j d � r6 | j j | j | d | j �} n | j j | � } t � } t � } i } x� | D]z } | j | | � } t g | D] } | d ^ q� � | | <x8 | D]0 } | | d k r� | j | d | f � q� q� Wqg Wy t
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| � f g S( sx Return dependency-sorted table and foreign key constraint names in
referred to within a particular schema.
This will yield 2-tuples of
``(tablename, [(tname, fkname), (tname, fkname), ...])``
consisting of table names in CREATE order grouped with the foreign key
constraint names that are not detected as belonging to a cycle.
The final element
will be ``(None, [(tname, fkname), (tname, fkname), ..])``
which will consist of remaining
foreign key constraint names that would require a separate CREATE
step after-the-fact, based on dependencies between tables.
.. versionadded:: 1.0.-
.. seealso::
:meth:`.Inspector.get_table_names`
:func:`.sort_tables_and_constraints` - similar method which works
with an already-given :class:`.MetaData`.
R/ R
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R! R2 t setR3 t addR5 R R6 R t CircularDependencyErrort edgest removet updatet
differenceR ( R R R7 R8 t remaining_fkcst fknames_for_tableR9 t fkeyst fkR: t candidate_sortt err( ( R= sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyt get_sorted_table_and_fkc_names� s0
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"
# &c C s | j j | j d | j �S( s� return a list of temporary table names for the current bind.
This method is unsupported by most dialects; currently
only SQLite implements it.
.. versionadded:: 1.0.0
R
( R& t get_temp_table_namesR" R
( R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyRL s c C s | j j | j d | j �S( s� return a list of temporary view names for the current bind.
This method is unsupported by most dialects; currently
only SQLite implements it.
.. versionadded:: 1.0.0
R
( R& t get_temp_view_namesR" R
( R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyRM s c K s; t | j d � r7 | j j | j | | d | j | �Si S( s� Return a dictionary of options specified when the table of the
given name was created.
This currently includes some options that apply to MySQL tables.
:param table_name: string name of the table. For special quoting,
use :class:`.quoted_name`.
:param schema: string schema name; if omitted, uses the default schema
of the database connection. For special quoting,
use :class:`.quoted_name`.
t get_table_optionsR
( R# R& RN R" R
( R t
table_nameR R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyRN * s c C s | j j | j | d | j �S( s� Return all view names in `schema`.
:param schema: Optional, retrieve names from a non-default schema.
For special quoting, use :class:`.quoted_name`.
R
( R& t get_view_namesR" R
( R R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyRP > s c C s" | j j | j | | d | j �S( s� Return definition for `view_name`.
:param schema: Optional, retrieve names from a non-default schema.
For special quoting, use :class:`.quoted_name`.
R
( R& t get_view_definitionR" R
( R t view_nameR ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyRQ J s c K se | j j | j | | d | j | �} x7 | D]/ } | d } t | t � s. | � | d <q. q. W| S( s� Return information about columns in `table_name`.
Given a string `table_name` and an optional string `schema`, return
column information as a list of dicts with these keys:
* ``name`` - the column's name
* ``type`` - the type of this column; an instance of
:class:`~sqlalchemy.types.TypeEngine`
* ``nullable`` - boolean flag if the column is NULL or NOT NULL
* ``default`` - the column's server default value - this is returned
as a string SQL expression.
* ``attrs`` - dict containing optional column attributes
:param table_name: string name of the table. For special quoting,
use :class:`.quoted_name`.
:param schema: string schema name; if omitted, uses the default schema
of the database connection. For special quoting,
use :class:`.quoted_name`.
:return: list of dictionaries, each representing the definition of
a database column.
R
t type( R& t get_columnsR" R
R R ( R RO R R t col_defst col_deft coltype( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyRT V s
s 0.7s� The :meth:`.Inspector.get_primary_keys` method is deprecated and will be removed in a future release. Please refer to the :meth:`.Inspector.get_pk_constraint` method.c K s) | j j | j | | d | j | �d S( s� Return information about primary keys in `table_name`.
Given a string `table_name`, and an optional string `schema`, return
primary key information as a list of column names.
R
t constrained_columns( R& t get_pk_constraintR" R
( R RO R R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyt get_primary_keys~ s
c K s% | j j | j | | d | j | �S( s� Return information about primary key constraint on `table_name`.
Given a string `table_name`, and an optional string `schema`, return
primary key information as a dictionary with these keys:
constrained_columns
a list of column names that make up the primary key
name
optional name of the primary key constraint.
:param table_name: string name of the table. For special quoting,
use :class:`.quoted_name`.
:param schema: string schema name; if omitted, uses the default schema
of the database connection. For special quoting,
use :class:`.quoted_name`.
R
( R& RY R" R
( R RO R R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyRY � s c K s% | j j | j | | d | j | �S( s� Return information about foreign_keys in `table_name`.
Given a string `table_name`, and an optional string `schema`, return
foreign key information as a list of dicts with these keys:
constrained_columns
a list of column names that make up the foreign key
referred_schema
the name of the referred schema
referred_table
the name of the referred table
referred_columns
a list of column names in the referred table that correspond to
constrained_columns
name
optional name of the foreign key constraint.
:param table_name: string name of the table. For special quoting,
use :class:`.quoted_name`.
:param schema: string schema name; if omitted, uses the default schema
of the database connection. For special quoting,
use :class:`.quoted_name`.
R
( R& R3 R" R
( R RO R R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyR3 � s c K s% | j j | j | | d | j | �S( s� Return information about indexes in `table_name`.
Given a string `table_name` and an optional string `schema`, return
index information as a list of dicts with these keys:
name
the index's name
column_names
list of column names in order
unique
boolean
column_sorting
optional dict mapping column names to tuple of sort keywords,
which may include ``asc``, ``desc``, ``nullsfirst``, ``nullslast``.
.. versionadded:: 1.3.5
dialect_options
dict of dialect-specific index options. May not be present
for all dialects.
.. versionadded:: 1.0.0
:param table_name: string name of the table. For special quoting,
use :class:`.quoted_name`.
:param schema: string schema name; if omitted, uses the default schema
of the database connection. For special quoting,
use :class:`.quoted_name`.
R
( R& t get_indexesR" R
( R RO R R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyR[ � s $ c K s% | j j | j | | d | j | �S( so Return information about unique constraints in `table_name`.
Given a string `table_name` and an optional string `schema`, return
unique constraint information as a list of dicts with these keys:
name
the unique constraint's name
column_names
list of column names in order
:param table_name: string name of the table. For special quoting,
use :class:`.quoted_name`.
:param schema: string schema name; if omitted, uses the default schema
of the database connection. For special quoting,
use :class:`.quoted_name`.
R
( R& t get_unique_constraintsR" R
( R RO R R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyR\ � s c K s% | j j | j | | d | j | �S( s� Return information about the table comment for ``table_name``.
Given a string ``table_name`` and an optional string ``schema``,
return table comment information as a dictionary with these keys:
text
text of the comment.
Raises ``NotImplementedError`` for a dialect that does not support
comments.
.. versionadded:: 1.2
R
( R& t get_table_commentR" R
( R RO R R ( ( sO /opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/engine/reflection.pyR] s c K s% | j j | j | | d | j | �S( s� Return information about check constraints in `table_name`.
Given a string `table_name` and an optional string `schema`, return
check constraint information as a list of dicts with these keys:
name
the check constraint's name
sqltext
the check constraint's SQL expression
:param table_name: string name of the table. For special quoting,
use :class:`.quoted_name`.
:param schema: string schema name; if omitted, uses the default schema
of the database connection. For special quoting,
use :class:`.quoted_name`.
.. versionadded:: 1.1.0
R
( R& t get_check_constraintsR" R
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introspection.
This is the underlying method used by most dialects to produce
table reflection. Direct usage is like::
from sqlalchemy import create_engine, MetaData, Table
from sqlalchemy.engine.reflection import Inspector
engine = create_engine('...')
meta = MetaData()
user_table = Table('user', meta)
insp = Inspector.from_engine(engine)
insp.reflecttable(user_table, None)
:param table: a :class:`~sqlalchemy.schema.Table` instance.
:param include_columns: a list of string column names to include
in the reflection process. If ``None``, all columns are reflected.
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