deps/sqlalchemy/engine/__pycache__/interfaces.cpython-34.pyc

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    Any aspect of metadata definition, SQL query generation,
    execution, result-set handling, or anything else which varies
    between databases is defined under the general category of the
    Dialect.  The Dialect acts as a factory for other
    database-specific object implementations including
    ExecutionContext, Compiled, DefaultGenerator, and TypeEngine.

    All Dialects implement the following attributes:

    name
      identifying name for the dialect from a DBAPI-neutral point of view
      (i.e. 'sqlite')

    driver
      identifying name for the dialect's DBAPI

    positional
      True if the paramstyle for this Dialect is positional.

    paramstyle
      the paramstyle to be used (some DB-APIs support multiple
      paramstyles).

    convert_unicode
      True if Unicode conversion should be applied to all ``str``
      types.

    encoding
      type of encoding to use for unicode, usually defaults to
      'utf-8'.

    statement_compiler
      a :class:`.Compiled` class used to compile SQL statements

    ddl_compiler
      a :class:`.Compiled` class used to compile DDL statements

    server_version_info
      a tuple containing a version number for the DB backend in use.
      This value is only available for supporting dialects, and is
      typically populated during the initial connection to the database.

    default_schema_name
     the name of the default schema.  This value is only available for
     supporting dialects, and is typically populated during the
     initial connection to the database.

    execution_ctx_cls
      a :class:`.ExecutionContext` class used to handle statement execution

    execute_sequence_format
      either the 'tuple' or 'list' type, depending on what cursor.execute()
      accepts for the second argument (they vary).

    preparer
      a :class:`~sqlalchemy.sql.compiler.IdentifierPreparer` class used to
      quote identifiers.

    supports_alter
      ``True`` if the database supports ``ALTER TABLE``.

    max_identifier_length
      The maximum length of identifier names.

    supports_unicode_statements
      Indicate whether the DB-API can receive SQL statements as Python
      unicode strings

    supports_unicode_binds
      Indicate whether the DB-API can receive string bind parameters
      as Python unicode strings

    supports_sane_rowcount
      Indicate whether the dialect properly implements rowcount for
      ``UPDATE`` and ``DELETE`` statements.

    supports_sane_multi_rowcount
      Indicate whether the dialect properly implements rowcount for
      ``UPDATE`` and ``DELETE`` statements when executed via
      executemany.

    preexecute_autoincrement_sequences
      True if 'implicit' primary key functions must be executed separately
      in order to get their value.   This is currently oriented towards
      Postgresql.

    implicit_returning
      use RETURNING or equivalent during INSERT execution in order to load
      newly generated primary keys and other column defaults in one execution,
      which are then available via inserted_primary_key.
      If an insert statement has returning() specified explicitly,
      the "implicit" functionality is not used and inserted_primary_key
      will not be available.

    dbapi_type_map
      A mapping of DB-API type objects present in this Dialect's
      DB-API implementation mapped to TypeEngine implementations used
      by the dialect.

      This is used to apply types to result sets based on the DB-API
      types present in cursor.description; it only takes effect for
      result sets against textual statements where no explicit
      typemap was present.

    colspecs
      A dictionary of TypeEngine classes from sqlalchemy.types mapped
      to subclasses that are specific to the dialect class.  This
      dictionary is class-level only and is not accessed from the
      dialect instance itself.

    supports_default_values
      Indicates if the construct ``INSERT INTO tablename DEFAULT
      VALUES`` is supported

    supports_sequences
      Indicates if the dialect supports CREATE SEQUENCE or similar.

    sequences_optional
      If True, indicates if the "optional" flag on the Sequence() construct
      should signal to not generate a CREATE SEQUENCE. Applies only to
      dialects that support sequences. Currently used only to allow Postgresql
      SERIAL to be used on a column that specifies Sequence() for usage on
      other backends.

    supports_native_enum
      Indicates if the dialect supports a native ENUM construct.
      This will prevent types.Enum from generating a CHECK
      constraint when that type is used.

    supports_native_boolean
      Indicates if the dialect supports a native boolean construct.
      This will prevent types.Boolean from generating a CHECK
      constraint when that type is used.

    dbapi_exception_translation_map
       A dictionary of names that will contain as values the names of
       pep-249 exceptions ("IntegrityError", "OperationalError", etc)
       keyed to alternate class names, to support the case where a
       DBAPI has exception classes that aren't named as they are
       referred to (e.g. IntegrityError = MyException).   In the vast
       majority of cases this dictionary is empty.

       .. versionadded:: 1.0.5

    FcCs
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        Given a :class:`~sqlalchemy.engine.url.URL` object, returns a tuple
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        N)<01>NotImplementedError)<02>self<6C>url<72>r
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t<00><00>dS)a4Transform a generic type to a dialect-specific type.

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zDialect.type_descriptorcCsdS)a<>Called during strategized creation of the dialect with a
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t<00><00>dS)arLoad table description from the database.

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        properties from the database.

        The implementation of this method is provided by
        :meth:`.DefaultDialect.reflecttable`, which makes use of
        :class:`.Inspector` to retrieve column information.

        Dialects should **not** seek to implement this method, and should
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r<00>reflecttable<6C>szDialect.reflecttableNcKs
t<00><00>dS)a<>Return information about columns in `table_name`.

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        name
          the column's name

        type
          [sqlalchemy.types#TypeEngine]

        nullable
          boolean

        default
          the column's default value

        autoincrement
          boolean

        sequence
          a dictionary of the form
              {'name' : str, 'start' :int, 'increment': int, 'minvalue': int,
               'maxvalue': int, 'nominvalue': bool, 'nomaxvalue': bool,
               'cycle': bool}

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        N)r)rr<00>
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r<00>get_columns<6E>szDialect.get_columnscKs
t<00><00>dS)a*Return information about primary keys in `table_name`.


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        directly.

        N)r)rrrrrr
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r<00>get_primary_keysszDialect.get_primary_keyscKs
t<00><00>dS)a<>Return information about the primary key constraint on
        table_name`.

        Given a :class:`.Connection`, a string
        `table_name`, and an optional string `schema`, return primary
        key information as a dictionary with these keys:

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        name
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        N)r)rrrrrr
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r<00>get_pk_constraintszDialect.get_pk_constraintcKs
t<00><00>dS)a<>Return information about foreign_keys in `table_name`.

        Given a :class:`.Connection`, a string
        `table_name`, and an optional string `schema`, return foreign
        key information as a list of dicts with these keys:

        name
          the constraint's name

        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
        N)r)rrrrrr
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r<00>get_foreign_keys&szDialect.get_foreign_keyscKs
t<00><00>dS)z*Return a list of table names for `schema`.N)r)rrrrr
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r<00>get_table_names@szDialect.get_table_namescKs
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        N)r)rrrrr
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r<00>get_temp_table_namesEszDialect.get_temp_table_namescKs
t<00><00>dS)z<>Return a list of all view names available in the database.

        schema:
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        N)r)rrrrr
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r<00>get_view_namesMszDialect.get_view_namescKs
t<00><00>dS)zxReturn a list of temporary view names on the given connection,
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        N)r)rrrrr
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r<00>get_temp_view_namesVszDialect.get_temp_view_namescKs
t<00><00>dS)z<>Return view definition.

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        N)r)rrZ	view_namerrr
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r<00>get_view_definition^szDialect.get_view_definitioncKs
t<00><00>dS)auReturn information about indexes in `table_name`.

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        information as a list of dictionaries with these keys:

        name
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        column_names
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        unique
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        N)r)rrrrrr
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r<00>get_indexeshszDialect.get_indexescKs
t<00><00>dS)a<>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

        \**kw
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          method.

        .. versionadded:: 0.9.0

        N)r)rrrrrr
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r<00>get_unique_constraints{szDialect.get_unique_constraintscCs
t<00><00>dS)z<>convert the given name to lowercase if it is detected as
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        N)r)r<00>namer
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r<00>normalize_name<6D>szDialect.normalize_namecCs
t<00><00>dS)z<>convert the given name to a case insensitive identifier
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        this method is only used if the dialect defines
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        N)r)rr!r
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r<00>denormalize_name<6D>szDialect.denormalize_namecCs
t<00><00>dS)aCheck the existence of a particular table in the database.

        Given a :class:`.Connection` object and a string
        `table_name`, return True if the given table (possibly within
        the specified `schema`) exists in the database, False
        otherwise.
        N)r)rrrrr
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r<00>	has_table<6C>s	zDialect.has_tablecCs
t<00><00>dS)z<>Check the existence of a particular sequence in the database.

        Given a :class:`.Connection` object and a string
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        the database, False otherwise.
        N)r)rrZ
sequence_namerr
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r<00>has_sequence<63>szDialect.has_sequencecCs
t<00><00>dS)z<>Retrieve the server version info from the given connection.

        This is used by the default implementation to populate the
        "server_version_info" attribute and is called exactly
        once upon first connect.

        N)r)rrr
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r<00>_get_server_version_info<66>s	z Dialect._get_server_version_infocCs
t<00><00>dS)aReturn the string name of the currently selected schema from
        the given connection.

        This is used by the default implementation to populate the
        "default_schema_name" attribute and is called exactly
        once upon first connect.

        N)r)rrr
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r<00>_get_default_schema_name<6D>s
z Dialect._get_default_schema_namecCs
t<00><00>dS)a/Provide an implementation of ``connection.begin()``, given a
        DB-API connection.

        The DBAPI has no dedicated "begin" method and it is expected
        that transactions are implicit.  This hook is provided for those
        DBAPIs that might need additional help in this area.

        Note that :meth:`.Dialect.do_begin` is not called unless a
        :class:`.Transaction` object is in use.  The
        :meth:`.Dialect.do_autocommit`
        hook is provided for DBAPIs that need some extra commands emitted
        after a commit in order to enter the next transaction, when the
        SQLAlchemy :class:`.Connection` is used in its default "autocommit"
        mode.

        :param dbapi_connection: a DBAPI connection, typically
         proxied within a :class:`.ConnectionFairy`.

         N)r)r<00>dbapi_connectionr
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r<00>do_begin<69>szDialect.do_begincCs
t<00><00>dS)z<>Provide an implementation of ``connection.rollback()``, given
        a DB-API connection.

        :param dbapi_connection: a DBAPI connection, typically
         proxied within a :class:`.ConnectionFairy`.

         N)r)rr(r
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r<00>do_rollback<63>s	zDialect.do_rollbackcCs
t<00><00>dS)z<>Provide an implementation of ``connection.commit()``, given a
        DB-API connection.

        :param dbapi_connection: a DBAPI connection, typically
         proxied within a :class:`.ConnectionFairy`.

        N)r)rr(r
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r<00>	do_commit<69>s	zDialect.do_commitcCs
t<00><00>dS)a2Provide an implementation of ``connection.close()``, given a DBAPI
        connection.

        This hook is called by the :class:`.Pool` when a connection has been
        detached from the pool, or is being returned beyond the normal
        capacity of the pool.

        .. versionadded:: 0.8

        N)r)rr(r
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r<00>do_close<73>szDialect.do_closecCs
t<00><00>dS)z<>Create a two-phase transaction ID.

        This id will be passed to do_begin_twophase(),
        do_rollback_twophase(), do_commit_twophase().  Its format is
        unspecified.
        N)r)rr
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r<00>
create_xid
szDialect.create_xidcCs
t<00><00>dS)z<>Create a savepoint with the given name.

        :param connection: a :class:`.Connection`.
        :param name: savepoint name.

        N)r)rrr!r
r
r<00>do_savepointszDialect.do_savepointcCs
t<00><00>dS)z<>Rollback a connection to the named savepoint.

        :param connection: a :class:`.Connection`.
        :param name: savepoint name.

        N)r)rrr!r
r
r<00>do_rollback_to_savepoint!sz Dialect.do_rollback_to_savepointcCs
t<00><00>dS)z<>Release the named savepoint on a connection.

        :param connection: a :class:`.Connection`.
        :param name: savepoint name.
        N)r)rrr!r
r
r<00>do_release_savepoint+szDialect.do_release_savepointcCs
t<00><00>dS)z<>Begin a two phase transaction on the given connection.

        :param connection: a :class:`.Connection`.
        :param xid: xid

        N)r)rr<00>xidr
r
r<00>do_begin_twophase4szDialect.do_begin_twophasecCs
t<00><00>dS)z<>Prepare a two phase transaction on the given connection.

        :param connection: a :class:`.Connection`.
        :param xid: xid

        N)r)rrr1r
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r<00>do_prepare_twophase>szDialect.do_prepare_twophaseTcCs
t<00><00>dS)a,Rollback a two phase transaction on the given connection.

        :param connection: a :class:`.Connection`.
        :param xid: xid
        :param is_prepared: whether or not
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        :param recover: if the recover flag was passed.

        N)r)rrr1<00>is_prepared<65>recoverr
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r<00>do_rollback_twophaseHszDialect.do_rollback_twophasecCs
t<00><00>dS)a+Commit a two phase transaction on the given connection.


        :param connection: a :class:`.Connection`.
        :param xid: xid
        :param is_prepared: whether or not
         :meth:`.TwoPhaseTransaction.prepare` was called.
        :param recover: if the recover flag was passed.

        N)r)rrr1r4r5r
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r<00>do_commit_twophaseVs
zDialect.do_commit_twophasecCs
t<00><00>dS)z<>Recover list of uncommited prepared two phase transaction
        identifiers on the given connection.

        :param connection: a :class:`.Connection`.

        N)r)rrr
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r<00>do_recover_twophaseeszDialect.do_recover_twophasecCs
t<00><00>dS)zSProvide an implementation of ``cursor.executemany(statement,
        parameters)``.N)r)r<00>cursor<6F>	statement<6E>
parameters<EFBFBD>contextr
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r<00>do_executemanyoszDialect.do_executemanycCs
t<00><00>dS)zOProvide an implementation of ``cursor.execute(statement,
        parameters)``.N)r)rr9r:r;r<r
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do_executeuszDialect.do_executecCs
t<00><00>dS)z{Provide an implementation of ``cursor.execute(statement)``.

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        N)r)rr9r:r;r<r
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r<00>do_execute_no_params{szDialect.do_execute_no_paramscCs
t<00><00>dS)zMReturn True if the given DB-API error indicates an invalid
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r<00>
is_disconnect<63>szDialect.is_disconnectcCsdS)areturn a callable which sets up a newly created DBAPI connection.

        The callable accepts a single argument "conn" which is the
        DBAPI connection itself.  It has no return value.

        This is used to set dialect-wide per-connection options such as
        isolation modes, unicode modes, etc.

        If a callable is returned, it will be assembled into a pool listener
        that receives the direct DBAPI connection, with all wrappers removed.

        If None is returned, no listener will be generated.

        Nr
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r<00>connect<63>szDialect.connectcCs
t<00><00>dS)a<>Given a DBAPI connection, revert its isolation to the default.

        Note that this is a dialect-level method which is used as part
        of the implementation of the :class:`.Connection` and
        :class:`.Engine`
        isolation level facilities; these APIs should be preferred for
        most typical use cases.

        .. seealso::

            :meth:`.Connection.get_isolation_level` - view current level

            :attr:`.Connection.default_isolation_level` - view default level

            :paramref:`.Connection.execution_options.isolation_level` -
            set per :class:`.Connection` isolation level

            :paramref:`.create_engine.isolation_level` -
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        N)r)r<00>
dbapi_connr
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r<00>reset_isolation_level<65>szDialect.reset_isolation_levelcCs
t<00><00>dS)a<>Given a DBAPI connection, set its isolation level.

        Note that this is a dialect-level method which is used as part
        of the implementation of the :class:`.Connection` and
        :class:`.Engine`
        isolation level facilities; these APIs should be preferred for
        most typical use cases.

        .. seealso::

            :meth:`.Connection.get_isolation_level` - view current level

            :attr:`.Connection.default_isolation_level` - view default level

            :paramref:`.Connection.execution_options.isolation_level` -
            set per :class:`.Connection` isolation level

            :paramref:`.create_engine.isolation_level` -
            set per :class:`.Engine` isolation level

        N)r)rrC<00>levelr
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r<00>set_isolation_level<65>szDialect.set_isolation_levelcCs
t<00><00>dS)a<>Given a DBAPI connection, return its isolation level.

        When working with a :class:`.Connection` object, the corresponding
        DBAPI connection may be procured using the
        :attr:`.Connection.connection` accessor.

        Note that this is a dialect-level method which is used as part
        of the implementation of the :class:`.Connection` and
        :class:`.Engine` isolation level facilities;
        these APIs should be preferred for most typical use cases.


        .. seealso::

            :meth:`.Connection.get_isolation_level` - view current level

            :attr:`.Connection.default_isolation_level` - view default level

            :paramref:`.Connection.execution_options.isolation_level` -
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            :paramref:`.create_engine.isolation_level` -
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r<00>get_isolation_level<65>szDialect.get_isolation_levelcCs|S)a<>Given a URL, return the :class:`.Dialect` that will be used.

        This is a hook that allows an external plugin to provide functionality
        around an existing dialect, by allowing the plugin to be loaded
        from the url based on an entrypoint, and then the plugin returns
        the actual dialect to be used.

        By default this just returns the cls.

        .. versionadded:: 1.0.3

        r
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r<00>get_dialect_cls<6C>szDialect.get_dialect_clscCsdS)aqA convenience hook called before returning the final :class:`.Engine`.

        If the dialect returned a different class from the
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        The hook should be used by dialects and/or wrappers to apply special
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        .. versionadded:: 1.0.3

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    connection
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      generators to execute SQL.  This Connection should reference the
      same underlying connection/transactional resources of
      root_connection.

    root_connection
      Connection object which is the source of this ExecutionContext.  This
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      only be used once.

    dialect
      dialect which created this ExecutionContext.

    cursor
      DB-API cursor procured from the connection,

    compiled
      if passed to constructor, sqlalchemy.engine.base.Compiled object
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    statement
      string version of the statement to be executed.  Is either
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    parameters
      bind parameters passed to the execute() method.  For compiled
      statements, this is a dictionary or list of dictionaries.  For
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