B \@sdZddlmZddlmZddlmZddlmZddlmZddlmZ dd l m Z dd lm Z dd lm Z ejd d ZGdddeZdS)aProvides 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.. ) Connectable)exc) inspection)sql)util)schema) TypeEngine) deprecated) topologicalcOs|dd}|dkr&|||f||S|jtdd|Dtdd|Df}||}|dkr~|||f||}|||<|S)N info_cachecss|]}t|tjr|VqdS)N) isinstancer string_types).0ar;lib/python3.7/site-packages/sqlalchemy/engine/reflection.py .szcache..css2|]*\}}t|tjtjtfr||fVqdS)N)r rrZ int_typesfloat)rkvrrrr0s)get__name__tupleitems)fnselfZconargskwr keyZretrrrcache's  r c@s<eZdZdZddZeddZee ddZ e dd Z d d Z ejd d dCddZdDddZddZddZdEddZdFddZdGddZdHddZedd dId!d"ZdJd#d$ZdKd%d&ZdLd'd(ZdMd)d*ZdNd+d,ZdOd-d.ZdPd1d2Z d3d4Z!d5d6Z"d7d8Z#d9d:Z$d;d<Z%d=d>Z&d?d@Z'dAdBZ(dS)Q InspectoramPerforms 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. cCsJ||_t|dr|j|_n||_|j|kr6||jj|_i|_dS)ajInitialize 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` engineN)bindhasattrr"Zconnectclosedialectr )rr#rrr__init__Ws      zInspector.__init__cCs t|jdr|j|St|S)aConstruct 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`. inspector)r$r&r(r!)clsr#rrr from_enginess  zInspector.from_enginecCs t|S)N)r!r*)r#rrr_inspszInspector._inspcCs|jjS)zReturn the default schema name presented by the dialect for the current engine's database user. E.g. this is typically ``public`` for PostgreSQL and ``dbo`` for SQL Server. )r&default_schema_name)rrrrr,s zInspector.default_schema_namecCs$t|jdr |jj|j|jdSgS)z!Return all schema names. get_schema_names)r )r$r&r-r#r )rrrrr-s zInspector.get_schema_names)z1.0zThe :paramref:`get_table_names.order_by` parameter is deprecated and will be removed in a future release. Please refer to :meth:`.Inspector.get_sorted_table_and_fkc_names` for a more comprehensive solution to resolving foreign key cycles between tables.)order_byNcCst|jdr$|jj|j||jd}n |j|}|dkrg}x@|D]8}x2|||D]"}||dkrT||d|fqTWqBWt t ||}|S)aReturn 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` get_table_names)r Z foreign_keyreferred_table) r$r&r/r#r r" table_namesget_foreign_keysappendlistr sort)rrr.tnamestuplestnamefkeyrrrr/s%    zInspector.get_table_namesc sDt|jdr$|jj|j||jd}n |j|}t}tixZ|D]R}|||}tdd|D|<x*|D]"}||dkrr| |d|fqrWqFWyt t ||}Wnpt jk r }zNx8|jD].|fdddDqWt t ||}Wd d }~XYnXfd d|Dd t fgS) axReturn 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 cSsg|] }|dqS)namer)rZfkrrr sz.r0c3s|]}d|fVqdS)rNr)rZfkc)edgerrrsz;Inspector.get_sorted_table_and_fkc_names..rNcsg|]}||fqSr) difference)rr8)fknames_for_tableremaining_fkcsrrr; s)r$r&r/r#r r"r1setr2addr4r r5rZCircularDependencyErrorZedgesremoveupdate) rrr6r7r8fkeysr9Zcandidate_sorterrr)r<r>r?rget_sorted_table_and_fkc_namess0         " z(Inspector.get_sorted_table_and_fkc_namescCs|jj|j|jdS)zreturn a list of temporary table names for the current bind. This method is unsupported by most dialects; currently only SQLite implements it. .. versionadded:: 1.0.0 )r )r&get_temp_table_namesr#r )rrrrrGs zInspector.get_temp_table_namescCs|jj|j|jdS)zreturn a list of temporary view names for the current bind. This method is unsupported by most dialects; currently only SQLite implements it. .. versionadded:: 1.0.0 )r )r&get_temp_view_namesr#r )rrrrrHs zInspector.get_temp_view_namescKs0t|jdr,|jj|j||fd|ji|SiS)aReturn a dictionary of options specified when the table of the given name was created. This currently includes some options that apply to MySQL tables. :param table_name: string name of the table. For special quoting, use :class:`.quoted_name`. :param schema: string schema name; if omitted, uses the default schema of the database connection. For special quoting, use :class:`.quoted_name`. get_table_optionsr )r$r&rIr#r )r table_namerrrrrrI)s zInspector.get_table_optionscCs|jj|j||jdS)zReturn all view names in `schema`. :param schema: Optional, retrieve names from a non-default schema. For special quoting, use :class:`.quoted_name`. )r )r&get_view_namesr#r )rrrrrrK=szInspector.get_view_namescCs|jj|j|||jdS)zReturn definition for `view_name`. :param schema: Optional, retrieve names from a non-default schema. For special quoting, use :class:`.quoted_name`. )r )r&get_view_definitionr#r )rZ view_namerrrrrLIszInspector.get_view_definitioncKsN|jj|j||fd|ji|}x(|D] }|d}t|ts&||d<q&W|S)aReturn 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 type)r& get_columnsr#r r r )rrJrrZcol_defsZcol_defcoltyperrrrNUs  zInspector.get_columnsz0.7zThe :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.cKs$|jj|j||fd|ji|dS)zReturn 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 constrained_columns)r&get_pk_constraintr#r )rrJrrrrrget_primary_keys}s zInspector.get_primary_keyscKs |jj|j||fd|ji|S)aReturn 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&rQr#r )rrJrrrrrrQszInspector.get_pk_constraintcKs |jj|j||fd|ji|S)aReturn 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&r2r#r )rrJrrrrrr2szInspector.get_foreign_keyscKs |jj|j||fd|ji|S)a 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 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& get_indexesr#r )rrJrrrrrrSszInspector.get_indexescKs |jj|j||fd|ji|S)aoReturn 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&get_unique_constraintsr#r )rrJrrrrrrTsz Inspector.get_unique_constraintscKs |jj|j||fd|ji|S)aReturn 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&get_table_commentr#r )rrJrrrrrrUszInspector.get_table_commentcKs |jj|j||fd|ji|S)aReturn 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&get_check_constraintsr#r )rrJrrrrrrVszInspector.get_check_constraintsrTc sl|dk r|krdS||jj}|j}j}tfdd|jD} |j||fj} | rp | t j rt |t r||j}t |t r||j}d} i} x0|j||fjD]} d} || ||| qW| stj|||| ||||| |||| |||| ||| |||| ||| |||| ||| |||| dS)a Given a Table object, load its internal constructs based on 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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