§ eţé$ŁN}ăó2—dZddlmZddlZddlmZddlmZddlmZddlm Z dd lm Zdd lmZddl mZddl mZdd l mZddl mZdd l mZddl mZddl mZddl mZddl mZddl mZddl mZddl mZddl mZddl mZddl mZed ¦«¦«Zed ¦«¦«Z Gd„dej!¦«Z"e"Z#Gd„dej$¦«Z%Gd„d e¦«Z&eZ'Gd!„d"ej(ej)¦«Z*Gd#„d$ej+¦«Z,Gd%„d&ej+¦«Z-Gd'„d(ej+¦«Z.Gd)„d*ej/¦«Z0Gd+„d,ej$¦«Z1Gd-„d.ej2¦«Z3Gd/„d0ej4¦«Z5Gd1„d2ej4¦«Z6Gd3„d4ej7¦«Z8ej7e8ej9e5ej2e3iZ:id e“d5e“d6e“d7e“d.e3“d"e*“d8e“d*e0“d9e“de%“d:e“d;e“de,“d,e1“e-e.d?śĄZ;Gd@„dAej<¦«Z=GdB„dCej>¦«Z?GdD„dEej@¦«ZAGdF„dGejB¦«ZCGdH„dIejD¦«ZEGdJ„dKejF¦«ZGGdL„dMe jH¦«ZIdS)NaPO .. dialect:: oracle :name: Oracle Oracle version 8 through current (11g at the time of this writing) are supported. Auto Increment Behavior ----------------------- SQLAlchemy Table objects which include integer primary keys are usually assumed to have "autoincrementing" behavior, meaning they can generate their own primary key values upon INSERT. Since Oracle has no "autoincrement" feature, SQLAlchemy relies upon sequences to produce these values. With the Oracle dialect, *a sequence must always be explicitly specified to enable autoincrement*. This is divergent with the majority of documentation examples which assume the usage of an autoincrement-capable database. To specify sequences, use the sqlalchemy.schema.Sequence object which is passed to a Column construct:: t = Table('mytable', metadata, Column('id', Integer, Sequence('id_seq'), primary_key=True), Column(...), ... ) This step is also required when using table reflection, i.e. autoload=True:: t = Table('mytable', metadata, Column('id', Integer, Sequence('id_seq'), primary_key=True), autoload=True ) .. _oracle_isolation_level: Transaction Isolation Level / Autocommit ---------------------------------------- The Oracle database supports "READ COMMITTED" and "SERIALIZABLE" modes of isolation. The AUTOCOMMIT isolation level is also supported by the cx_Oracle dialect. To set using per-connection execution options:: connection = engine.connect() connection = connection.execution_options( isolation_level="AUTOCOMMIT" ) For ``READ COMMITTED`` and ``SERIALIZABLE``, the Oracle dialect sets the level at the session level using ``ALTER SESSION``, which is reverted back to its default setting when the connection is returned to the connection pool. Valid values for ``isolation_level`` include: * ``READ COMMITTED`` * ``AUTOCOMMIT`` * ``SERIALIZABLE`` .. note:: The implementation for the :meth:`_engine.Connection.get_isolation_level` method as implemented by the Oracle dialect necessarily forces the start of a transaction using the Oracle LOCAL_TRANSACTION_ID function; otherwise no level is normally readable. Additionally, the :meth:`_engine.Connection.get_isolation_level` method will raise an exception if the ``v$transaction`` view is not available due to permissions or other reasons, which is a common occurrence in Oracle installations. The cx_Oracle dialect attempts to call the :meth:`_engine.Connection.get_isolation_level` method when the dialect makes its first connection to the database in order to acquire the "default"isolation level. This default level is necessary so that the level can be reset on a connection after it has been temporarily modified using :meth:`_engine.Connection.execution_options` method. In the common event that the :meth:`_engine.Connection.get_isolation_level` method raises an exception due to ``v$transaction`` not being readable as well as any other database-related failure, the level is assumed to be "READ COMMITTED". No warning is emitted for this initial first-connect condition as it is expected to be a common restriction on Oracle databases. .. versionadded:: 1.3.16 added support for AUTOCOMMIT to the cx_oracle dialect as well as the notion of a default isolation level .. versionadded:: 1.3.21 Added support for SERIALIZABLE as well as live reading of the isolation level. .. versionchanged:: 1.3.22 In the event that the default isolation level cannot be read due to permissions on the v$transaction view as is common in Oracle installations, the default isolation level is hardcoded to "READ COMMITTED" which was the behavior prior to 1.3.21. .. seealso:: :ref:`dbapi_autocommit` Identifier Casing ----------------- In Oracle, the data dictionary represents all case insensitive identifier names using UPPERCASE text. SQLAlchemy on the other hand considers an all-lower case identifier name to be case insensitive. The Oracle dialect converts all case insensitive identifiers to and from those two formats during schema level communication, such as reflection of tables and indexes. Using an UPPERCASE name on the SQLAlchemy side indicates a case sensitive identifier, and SQLAlchemy will quote the name - this will cause mismatches against data dictionary data received from Oracle, so unless identifier names have been truly created as case sensitive (i.e. using quoted names), all lowercase names should be used on the SQLAlchemy side. .. _oracle_max_identifier_lengths: Max Identifier Lengths ---------------------- Oracle has changed the default max identifier length as of Oracle Server version 12.2. Prior to this version, the length was 30, and for 12.2 and greater it is now 128. This change impacts SQLAlchemy in the area of generated SQL label names as well as the generation of constraint names, particularly in the case where the constraint naming convention feature described at :ref:`constraint_naming_conventions` is being used. To assist with this change and others, Oracle includes the concept of a "compatibility" version, which is a version number that is independent of the actual server version in order to assist with migration of Oracle databases, and may be configured within the Oracle server itself. This compatibility version is retrieved using the query ``SELECT value FROM v$parameter WHERE name = 'compatible';``. The SQLAlchemy Oracle dialect, when tasked with determining the default max identifier length, will attempt to use this query upon first connect in order to determine the effective compatibility version of the server, which determines what the maximum allowed identifier length is for the server. If the table is not available, the server version information is used instead. For the duration of the SQLAlchemy 1.3 series, the default max identifier length will remain at 30, even if compatibility version 12.2 or greater is in use. When the newer version is detected, a warning will be emitted upon first connect, which refers the user to make use of the :paramref:`_sa.create_engine.max_identifier_length` parameter in order to assure forwards compatibility with SQLAlchemy 1.4, which will be changing this value to 128 when compatibility version 12.2 or greater is detected. Using :paramref:`_sa.create_engine.max_identifier_length`, the effective identifier length used by the SQLAlchemy dialect will be used as given, overriding the current default value of 30, so that when Oracle 12.2 or greater is used, the newer identifier length may be taken advantage of:: engine = create_engine( "oracle+cx_oracle://scott:tiger@oracle122", max_identifier_length=128) The maximum identifier length comes into play both when generating anonymized SQL labels in SELECT statements, but more crucially when generating constraint names from a naming convention. It is this area that has created the need for SQLAlchemy to change this default conservatively. For example, the following naming convention produces two very different constraint names based on the identifier length:: from sqlalchemy import Column from sqlalchemy import Index from sqlalchemy import Integer from sqlalchemy import MetaData from sqlalchemy import Table from sqlalchemy.dialects import oracle from sqlalchemy.schema import CreateIndex m = MetaData(naming_convention={"ix": "ix_%(column_0N_name)s"}) t = Table( "t", m, Column("some_column_name_1", Integer), Column("some_column_name_2", Integer), Column("some_column_name_3", Integer), ) ix = Index( None, t.c.some_column_name_1, t.c.some_column_name_2, t.c.some_column_name_3, ) oracle_dialect = oracle.dialect(max_identifier_length=30) print(CreateIndex(ix).compile(dialect=oracle_dialect)) With an identifier length of 30, the above CREATE INDEX looks like:: CREATE INDEX ix_some_column_name_1s_70cd ON t (some_column_name_1, some_column_name_2, some_column_name_3) However with length=128, it becomes:: CREATE INDEX ix_some_column_name_1some_column_name_2some_column_name_3 ON t (some_column_name_1, some_column_name_2, some_column_name_3) The implication here is that by upgrading SQLAlchemy to version 1.4 on an existing Oracle 12.2 or greater database, the generation of constraint names will change, which can impact the behavior of database migrations. A key example is a migration that wishes to "DROP CONSTRAINT" on a name that was previously generated with the shorter length. This migration will fail when the identifier length is changed without the name of the index or constraint first being adjusted. Therefore, applications are strongly advised to make use of :paramref:`_sa.create_engine.max_identifier_length` in order to maintain control of the generation of truncated names, and to fully review and test all database migrations in a staging environment when changing this value to ensure that the impact of this change has been mitigated. .. versionadded:: 1.3.9 Added the :paramref:`_sa.create_engine.max_identifier_length` parameter; the Oracle dialect now detects compatibility version 12.2 or greater and warns about upcoming max identitifier length changes in SQLAlchemy 1.4. LIMIT/OFFSET Support -------------------- Oracle has no support for the LIMIT or OFFSET keywords. SQLAlchemy uses a wrapped subquery approach in conjunction with ROWNUM. The exact methodology is taken from http://www.oracle.com/technetwork/issue-archive/2006/06-sep/o56asktom-086197.html . There are two options which affect its behavior: * the "FIRST ROWS()" optimization keyword is not used by default. To enable the usage of this optimization directive, specify ``optimize_limits=True`` to :func:`_sa.create_engine`. * the values passed for the limit/offset are sent as bound parameters. Some users have observed that Oracle produces a poor query plan when the values are sent as binds and not rendered literally. To render the limit/offset values literally within the SQL statement, specify ``use_binds_for_limits=False`` to :func:`_sa.create_engine`. Some users have reported better performance when the entirely different approach of a window query is used, i.e. ROW_NUMBER() OVER (ORDER BY), to provide LIMIT/OFFSET (note that the majority of users don't observe this). To suit this case the method used for LIMIT/OFFSET can be replaced entirely. See the recipe at http://www.sqlalchemy.org/trac/wiki/UsageRecipes/WindowFunctionsByDefault which installs a select compiler that overrides the generation of limit/offset with a window function. .. _oracle_returning: RETURNING Support ----------------- The Oracle database supports a limited form of RETURNING, in order to retrieve result sets of matched rows from INSERT, UPDATE and DELETE statements. Oracle's RETURNING..INTO syntax only supports one row being returned, as it relies upon OUT parameters in order to function. In addition, supported DBAPIs have further limitations (see :ref:`cx_oracle_returning`). SQLAlchemy's "implicit returning" feature, which employs RETURNING within an INSERT and sometimes an UPDATE statement in order to fetch newly generated primary key values and other SQL defaults and expressions, is normally enabled on the Oracle backend. By default, "implicit returning" typically only fetches the value of a single ``nextval(some_seq)`` expression embedded into an INSERT in order to increment a sequence within an INSERT statement and get the value back at the same time. To disable this feature across the board, specify ``implicit_returning=False`` to :func:`_sa.create_engine`:: engine = create_engine("oracle://scott:tiger@dsn", implicit_returning=False) Implicit returning can also be disabled on a table-by-table basis as a table option:: # Core Table my_table = Table("my_table", metadata, ..., implicit_returning=False) # declarative class MyClass(Base): __tablename__ = 'my_table' __table_args__ = {"implicit_returning": False} .. seealso:: :ref:`cx_oracle_returning` - additional cx_oracle-specific restrictions on implicit returning. ON UPDATE CASCADE ----------------- Oracle doesn't have native ON UPDATE CASCADE functionality. A trigger based solution is available at http://asktom.oracle.com/tkyte/update_cascade/index.html . When using the SQLAlchemy ORM, the ORM has limited ability to manually issue cascading updates - specify ForeignKey objects using the "deferrable=True, initially='deferred'" keyword arguments, and specify "passive_updates=False" on each relationship(). Oracle 8 Compatibility ---------------------- When Oracle 8 is detected, the dialect internally configures itself to the following behaviors: * the use_ansi flag is set to False. This has the effect of converting all JOIN phrases into the WHERE clause, and in the case of LEFT OUTER JOIN makes use of Oracle's (+) operator. * the NVARCHAR2 and NCLOB datatypes are no longer generated as DDL when the :class:`~sqlalchemy.types.Unicode` is used - VARCHAR2 and CLOB are issued instead. This because these types don't seem to work correctly on Oracle 8 even though they are available. The :class:`~sqlalchemy.types.NVARCHAR` and :class:`~sqlalchemy.dialects.oracle.NCLOB` types will always generate NVARCHAR2 and NCLOB. * the "native unicode" mode is disabled when using cx_oracle, i.e. SQLAlchemy encodes all Python unicode objects to "string" before passing in as bind parameters. Synonym/DBLINK Reflection ------------------------- When using reflection with Table objects, the dialect can optionally search for tables indicated by synonyms, either in local or remote schemas or accessed over DBLINK, by passing the flag ``oracle_resolve_synonyms=True`` as a keyword argument to the :class:`_schema.Table` construct:: some_table = Table('some_table', autoload=True, autoload_with=some_engine, oracle_resolve_synonyms=True) When this flag is set, the given name (such as ``some_table`` above) will be searched not just in the ``ALL_TABLES`` view, but also within the ``ALL_SYNONYMS`` view to see if this name is actually a synonym to another name. If the synonym is located and refers to a DBLINK, the oracle dialect knows how to locate the table's information using DBLINK syntax(e.g. ``@dblink``). ``oracle_resolve_synonyms`` is accepted wherever reflection arguments are accepted, including methods such as :meth:`_schema.MetaData.reflect` and :meth:`_reflection.Inspector.get_columns`. If synonyms are not in use, this flag should be left disabled. .. _oracle_constraint_reflection: Constraint Reflection --------------------- The Oracle dialect can return information about foreign key, unique, and CHECK constraints, as well as indexes on tables. Raw information regarding these constraints can be acquired using :meth:`_reflection.Inspector.get_foreign_keys`, :meth:`_reflection.Inspector.get_unique_constraints`, :meth:`_reflection.Inspector.get_check_constraints`, and :meth:`_reflection.Inspector.get_indexes`. .. versionchanged:: 1.2 The Oracle dialect can now reflect UNIQUE and CHECK constraints. When using reflection at the :class:`_schema.Table` level, the :class:`_schema.Table` will also include these constraints. Note the following caveats: * When using the :meth:`_reflection.Inspector.get_check_constraints` method, Oracle builds a special "IS NOT NULL" constraint for columns that specify "NOT NULL". This constraint is **not** returned by default; to include the "IS NOT NULL" constraints, pass the flag ``include_all=True``:: from sqlalchemy import create_engine, inspect engine = create_engine("oracle+cx_oracle://s:t@dsn") inspector = inspect(engine) all_check_constraints = inspector.get_check_constraints( "some_table", include_all=True) * in most cases, when reflecting a :class:`_schema.Table`, a UNIQUE constraint will **not** be available as a :class:`.UniqueConstraint` object, as Oracle mirrors unique constraints with a UNIQUE index in most cases (the exception seems to be when two or more unique constraints represent the same columns); the :class:`_schema.Table` will instead represent these using :class:`.Index` with the ``unique=True`` flag set. * Oracle creates an implicit index for the primary key of a table; this index is **excluded** from all index results. * the list of columns reflected for an index will not include column names that start with SYS_NC. Table names with SYSTEM/SYSAUX tablespaces ------------------------------------------- The :meth:`_reflection.Inspector.get_table_names` and :meth:`_reflection.Inspector.get_temp_table_names` methods each return a list of table names for the current engine. These methods are also part of the reflection which occurs within an operation such as :meth:`_schema.MetaData.reflect`. By default, these operations exclude the ``SYSTEM`` and ``SYSAUX`` tablespaces from the operation. In order to change this, the default list of tablespaces excluded can be changed at the engine level using the ``exclude_tablespaces`` parameter:: # exclude SYSAUX and SOME_TABLESPACE, but not SYSTEM e = create_engine( "oracle://scott:tiger@xe", exclude_tablespaces=["SYSAUX", "SOME_TABLESPACE"]) .. versionadded:: 1.1 DateTime Compatibility ---------------------- Oracle has no datatype known as ``DATETIME``, it instead has only ``DATE``, which can actually store a date and time value. For this reason, the Oracle dialect provides a type :class:`_oracle.DATE` which is a subclass of :class:`.DateTime`. This type has no special behavior, and is only present as a "marker" for this type; additionally, when a database column is reflected and the type is reported as ``DATE``, the time-supporting :class:`_oracle.DATE` type is used. .. versionchanged:: 0.9.4 Added :class:`_oracle.DATE` to subclass :class:`.DateTime`. This is a change as previous versions would reflect a ``DATE`` column as :class:`_types.DATE`, which subclasses :class:`.Date`. The only significance here is for schemes that are examining the type of column for use in special Python translations or for migrating schemas to other database backends. .. _oracle_table_options: Oracle Table Options ------------------------- The CREATE TABLE phrase supports the following options with Oracle in conjunction with the :class:`_schema.Table` construct: * ``ON COMMIT``:: Table( "some_table", metadata, ..., prefixes=['GLOBAL TEMPORARY'], oracle_on_commit='PRESERVE ROWS') .. versionadded:: 1.0.0 * ``COMPRESS``:: Table('mytable', metadata, Column('data', String(32)), oracle_compress=True) Table('mytable', metadata, Column('data', String(32)), oracle_compress=6) The ``oracle_compress`` parameter accepts either an integer compression level, or ``True`` to use the default compression level. .. versionadded:: 1.0.0 .. _oracle_index_options: Oracle Specific Index Options ----------------------------- Bitmap Indexes ~~~~~~~~~~~~~~ You can specify the ``oracle_bitmap`` parameter to create a bitmap index instead of a B-tree index:: Index('my_index', my_table.c.data, oracle_bitmap=True) Bitmap indexes cannot be unique and cannot be compressed. SQLAlchemy will not check for such limitations, only the database will. .. versionadded:: 1.0.0 Index compression ~~~~~~~~~~~~~~~~~ Oracle has a more efficient storage mode for indexes containing lots of repeated values. Use the ``oracle_compress`` parameter to turn on key compression:: Index('my_index', my_table.c.data, oracle_compress=True) Index('my_index', my_table.c.data1, my_table.c.data2, unique=True, oracle_compress=1) The ``oracle_compress`` parameter accepts either an integer specifying the number of prefix columns to compress, or ``True`` to use the default (all columns for non-unique indexes, all but the last column for unique indexes). .. versionadded:: 1.0.0 é)ÚgroupbyNé)ÚComputed)Úexc©Úschema)Úsql)Útypes)Úutil)Údefault)Ú reflection)Úcompiler)Ú expression)Úvisitors)ÚBLOB)ÚCHAR)ÚCLOB)ÚFLOAT)ÚINTEGER)ÚNCHAR)ÚNVARCHAR)Ú TIMESTAMP)ÚVARCHARa SHARE RAW DROP BETWEEN FROM DESC OPTION PRIOR LONG THEN DEFAULT ALTER IS INTO MINUS INTEGER NUMBER GRANT IDENTIFIED ALL TO ORDER ON FLOAT DATE HAVING CLUSTER NOWAIT RESOURCE ANY TABLE INDEX FOR UPDATE WHERE CHECK SMALLINT WITH DELETE BY ASC REVOKE LIKE SIZE RENAME NOCOMPRESS NULL GROUP VALUES AS IN VIEW EXCLUSIVE COMPRESS SYNONYM SELECT INSERT EXISTS NOT TRIGGER ELSE CREATE INTERSECT PCTFREE DISTINCT USER CONNECT SET MODE OF UNIQUE VARCHAR2 VARCHAR LOCK OR CHAR DECIMAL UNION PUBLIC AND START UID COMMENT CURRENT LEVELzs r#r?zINTERVAL._type_affinity™s€ĺÔ Đ r")NN) rrrr r1Úclassmethodr`rAr?r!r"r#rXrX~sc€€€€€Ř€Nđ1đ1đ1đ1đ"đ đ ń„[đ đđ!đ!ń„Xđ!đ!đ!r"rXcó—eZdZdZdZdS)ÚROWIDzPOracle ROWID type. 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