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.. dialect:: mysql
    :name: MySQL

Supported Versions and Features
-------------------------------

SQLAlchemy supports MySQL starting with version 4.1 through modern releases.
However, no heroic measures are taken to work around major missing
SQL features - if your server version does not support sub-selects, for
example, they won't work in SQLAlchemy either.

See the official MySQL documentation for detailed information about features
supported in any given server release.

.. _mysql_connection_timeouts:

Connection Timeouts
-------------------

MySQL features an automatic connection close behavior, for connections that
have been idle for eight hours or more.   To circumvent having this issue, use
the ``pool_recycle`` option which controls the maximum age of any connection::

    engine = create_engine('mysql+mysqldb://...', pool_recycle=3600)

.. seealso::

    :ref:`pool_setting_recycle` - full description of the pool recycle feature.


.. _mysql_storage_engines:

CREATE TABLE arguments including Storage Engines
------------------------------------------------

MySQL's CREATE TABLE syntax includes a wide array of special options,
including ``ENGINE``, ``CHARSET``, ``MAX_ROWS``, ``ROW_FORMAT``,
``INSERT_METHOD``, and many more.
To accommodate the rendering of these arguments, specify the form
``mysql_argument_name="value"``.  For example, to specify a table with
``ENGINE`` of ``InnoDB``, ``CHARSET`` of ``utf8``, and ``KEY_BLOCK_SIZE``
of ``1024``::

  Table('mytable', metadata,
        Column('data', String(32)),
        mysql_engine='InnoDB',
        mysql_charset='utf8',
        mysql_key_block_size="1024"
       )

The MySQL dialect will normally transfer any keyword specified as
``mysql_keyword_name`` to be rendered as ``KEYWORD_NAME`` in the
``CREATE TABLE`` statement.  A handful of these names will render with a space
instead of an underscore; to support this, the MySQL dialect has awareness of
these particular names, which include ``DATA DIRECTORY``
(e.g. ``mysql_data_directory``), ``CHARACTER SET`` (e.g.
``mysql_character_set``) and ``INDEX DIRECTORY`` (e.g.
``mysql_index_directory``).

The most common argument is ``mysql_engine``, which refers to the storage
engine for the table.  Historically, MySQL server installations would default
to ``MyISAM`` for this value, although newer versions may be defaulting
to ``InnoDB``.  The ``InnoDB`` engine is typically preferred for its support
of transactions and foreign keys.

A :class:`.Table` that is created in a MySQL database with a storage engine
of ``MyISAM`` will be essentially non-transactional, meaning any
INSERT/UPDATE/DELETE statement referring to this table will be invoked as
autocommit.   It also will have no support for foreign key constraints; while
the ``CREATE TABLE`` statement accepts foreign key options, when using the
``MyISAM`` storage engine these arguments are discarded.  Reflecting such a
table will also produce no foreign key constraint information.

For fully atomic transactions as well as support for foreign key
constraints, all participating ``CREATE TABLE`` statements must specify a
transactional engine, which in the vast majority of cases is ``InnoDB``.

.. seealso::

    `The InnoDB Storage Engine
    <http://dev.mysql.com/doc/refman/5.0/en/innodb-storage-engine.html>`_ -
    on the MySQL website.

Case Sensitivity and Table Reflection
-------------------------------------

MySQL has inconsistent support for case-sensitive identifier
names, basing support on specific details of the underlying
operating system. However, it has been observed that no matter
what case sensitivity behavior is present, the names of tables in
foreign key declarations are *always* received from the database
as all-lower case, making it impossible to accurately reflect a
schema where inter-related tables use mixed-case identifier names.

Therefore it is strongly advised that table names be declared as
all lower case both within SQLAlchemy as well as on the MySQL
database itself, especially if database reflection features are
to be used.

.. _mysql_isolation_level:

Transaction Isolation Level
---------------------------

All MySQL dialects support setting of transaction isolation level
both via a dialect-specific parameter :paramref:`.create_engine.isolation_level`
accepted by :func:`.create_engine`,
as well as the :paramref:`.Connection.execution_options.isolation_level`
argument as passed to :meth:`.Connection.execution_options`.
This feature works by issuing the command
``SET SESSION TRANSACTION ISOLATION LEVEL <level>`` for
each new connection.

To set isolation level using :func:`.create_engine`::

    engine = create_engine(
                    "mysql://scott:tiger@localhost/test",
                    isolation_level="READ UNCOMMITTED"
                )

To set using per-connection execution options::

    connection = engine.connect()
    connection = connection.execution_options(
        isolation_level="READ COMMITTED"
    )

Valid values for ``isolation_level`` include:

* ``READ COMMITTED``
* ``READ UNCOMMITTED``
* ``REPEATABLE READ``
* ``SERIALIZABLE``

AUTO_INCREMENT Behavior
-----------------------

When creating tables, SQLAlchemy will automatically set ``AUTO_INCREMENT`` on
the first :class:`.Integer` primary key column which is not marked as a
foreign key::

  >>> t = Table('mytable', metadata,
  ...   Column('mytable_id', Integer, primary_key=True)
  ... )
  >>> t.create()
  CREATE TABLE mytable (
          id INTEGER NOT NULL AUTO_INCREMENT,
          PRIMARY KEY (id)
  )

You can disable this behavior by passing ``False`` to the
:paramref:`~.Column.autoincrement` argument of :class:`.Column`.  This flag
can also be used to enable auto-increment on a secondary column in a
multi-column key for some storage engines::

  Table('mytable', metadata,
        Column('gid', Integer, primary_key=True, autoincrement=False),
        Column('id', Integer, primary_key=True)
       )

.. _mysql_unicode:

Unicode
-------

Charset Selection
~~~~~~~~~~~~~~~~~

Most MySQL DBAPIs offer the option to set the client character set for
a connection.   This is typically delivered using the ``charset`` parameter
in the URL, such as::

    e = create_engine("mysql+pymysql://scott:tiger@localhost/\
test?charset=utf8")

This charset is the **client character set** for the connection.  Some
MySQL DBAPIs will default this to a value such as ``latin1``, and some
will make use of the ``default-character-set`` setting in the ``my.cnf``
file as well.   Documentation for the DBAPI in use should be consulted
for specific behavior.

The encoding used for Unicode has traditionally been ``'utf8'``.  However,
for MySQL versions 5.5.3 on forward, a new MySQL-specific encoding
``'utf8mb4'`` has been introduced.   The rationale for this new encoding
is due to the fact that MySQL's utf-8 encoding only supports
codepoints up to three bytes instead of four.  Therefore,
when communicating with a MySQL database
that includes codepoints more than three bytes in size,
this new charset is preferred, if supported by both the database as well
as the client DBAPI, as in::

    e = create_engine("mysql+pymysql://scott:tiger@localhost/\
test?charset=utf8mb4")

At the moment, up-to-date versions of MySQLdb and PyMySQL support the
``utf8mb4`` charset.   Other DBAPIs such as MySQL-Connector and OurSQL
may **not** support it as of yet.

In order to use ``utf8mb4`` encoding, changes to
the MySQL schema and/or server configuration may be required.

.. seealso::

    `The utf8mb4 Character Set \
<http://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html>`_ - \
in the MySQL documentation

Unicode Encoding / Decoding
~~~~~~~~~~~~~~~~~~~~~~~~~~~

All modern MySQL DBAPIs all offer the service of handling the encoding and
decoding of unicode data between the Python application space and the database.
As this was not always the case, SQLAlchemy also includes a comprehensive system
of performing the encode/decode task as well.   As only one of these systems
should be in use at at time, SQLAlchemy has long included functionality
to automatically detect upon first connection whether or not the DBAPI is
automatically handling unicode.

Whether or not the MySQL DBAPI will handle encoding can usually be configured
using a DBAPI flag ``use_unicode``, which is known to be supported at least
by MySQLdb, PyMySQL, and MySQL-Connector.   Setting this value to ``0``
in the "connect args" or query string will have the effect of disabling the
DBAPI's handling of unicode, such that it instead will return data of the
``str`` type or ``bytes`` type, with data in the configured charset::

    # connect while disabling the DBAPI's unicode encoding/decoding
    e = create_engine("mysql+mysqldb://scott:tiger@localhost/test?charset=utf8&use_unicode=0")

Current recommendations for modern DBAPIs are as follows:

* It is generally always safe to leave the ``use_unicode`` flag set at
  its default; that is, don't use it at all.
* Under Python 3, the ``use_unicode=0`` flag should **never be used**.
  SQLAlchemy under Python 3 generally assumes the DBAPI receives and returns
  string values as Python 3 strings, which are inherently unicode objects.
* Under Python 2 with MySQLdb, the ``use_unicode=0`` flag will **offer
  superior performance**, as MySQLdb's unicode converters under Python 2 only
  have been observed to have unusually slow performance compared to SQLAlchemy's
  fast C-based encoders/decoders.

In short:  don't specify ``use_unicode`` *at all*, with the possible
exception of ``use_unicode=0`` on MySQLdb with Python 2 **only** for a
potential performance gain.

Ansi Quoting Style
------------------

MySQL features two varieties of identifier "quoting style", one using
backticks and the other using quotes, e.g. ```some_identifier```  vs.
``"some_identifier"``.   All MySQL dialects detect which version
is in use by checking the value of ``sql_mode`` when a connection is first
established with a particular :class:`.Engine`.  This quoting style comes
into play when rendering table and column names as well as when reflecting
existing database structures.  The detection is entirely automatic and
no special configuration is needed to use either quoting style.

.. versionchanged:: 0.6 detection of ANSI quoting style is entirely automatic,
   there's no longer any end-user ``create_engine()`` options in this regard.

MySQL SQL Extensions
--------------------

Many of the MySQL SQL extensions are handled through SQLAlchemy's generic
function and operator support::

  table.select(table.c.password==func.md5('plaintext'))
  table.select(table.c.username.op('regexp')('^[a-d]'))

And of course any valid MySQL statement can be executed as a string as well.

Some limited direct support for MySQL extensions to SQL is currently
available.

* SELECT pragma::

    select(..., prefixes=['HIGH_PRIORITY', 'SQL_SMALL_RESULT'])

* UPDATE with LIMIT::

    update(..., mysql_limit=10)

rowcount Support
----------------

SQLAlchemy standardizes the DBAPI ``cursor.rowcount`` attribute to be the
usual definition of "number of rows matched by an UPDATE or DELETE" statement.
This is in contradiction to the default setting on most MySQL DBAPI drivers,
which is "number of rows actually modified/deleted".  For this reason, the
SQLAlchemy MySQL dialects always add the ``constants.CLIENT.FOUND_ROWS``
flag, or whatever is equivalent for the target dialect, upon connection.
This setting is currently hardcoded.

.. seealso::

    :attr:`.ResultProxy.rowcount`


CAST Support
------------

MySQL documents the CAST operator as available in version 4.0.2.  When using
the SQLAlchemy :func:`.cast` function, SQLAlchemy
will not render the CAST token on MySQL before this version, based on server
version detection, instead rendering the internal expression directly.

CAST may still not be desirable on an early MySQL version post-4.0.2, as it
didn't add all datatype support until 4.1.1.   If your application falls into
this narrow area, the behavior of CAST can be controlled using the
:ref:`sqlalchemy.ext.compiler_toplevel` system, as per the recipe below::

    from sqlalchemy.sql.expression import Cast
    from sqlalchemy.ext.compiler import compiles

    @compiles(Cast, 'mysql')
    def _check_mysql_version(element, compiler, **kw):
        if compiler.dialect.server_version_info < (4, 1, 0):
            return compiler.process(element.clause, **kw)
        else:
            return compiler.visit_cast(element, **kw)

The above function, which only needs to be declared once
within an application, overrides the compilation of the
:func:`.cast` construct to check for version 4.1.0 before
fully rendering CAST; else the internal element of the
construct is rendered directly.


.. _mysql_indexes:

MySQL Specific Index Options
----------------------------

MySQL-specific extensions to the :class:`.Index` construct are available.

Index Length
~~~~~~~~~~~~~

MySQL provides an option to create index entries with a certain length, where
"length" refers to the number of characters or bytes in each value which will
become part of the index. SQLAlchemy provides this feature via the
``mysql_length`` parameter::

    Index('my_index', my_table.c.data, mysql_length=10)

    Index('a_b_idx', my_table.c.a, my_table.c.b, mysql_length={'a': 4,
                                                               'b': 9})

Prefix lengths are given in characters for nonbinary string types and in bytes
for binary string types. The value passed to the keyword argument *must* be
either an integer (and, thus, specify the same prefix length value for all
columns of the index) or a dict in which keys are column names and values are
prefix length values for corresponding columns. MySQL only allows a length for
a column of an index if it is for a CHAR, VARCHAR, TEXT, BINARY, VARBINARY and
BLOB.

.. versionadded:: 0.8.2 ``mysql_length`` may now be specified as a dictionary
   for use with composite indexes.

Index Types
~~~~~~~~~~~~~

Some MySQL storage engines permit you to specify an index type when creating
an index or primary key constraint. SQLAlchemy provides this feature via the
``mysql_using`` parameter on :class:`.Index`::

    Index('my_index', my_table.c.data, mysql_using='hash')

As well as the ``mysql_using`` parameter on :class:`.PrimaryKeyConstraint`::

    PrimaryKeyConstraint("data", mysql_using='hash')

The value passed to the keyword argument will be simply passed through to the
underlying CREATE INDEX or PRIMARY KEY clause, so it *must* be a valid index
type for your MySQL storage engine.

More information can be found at:

http://dev.mysql.com/doc/refman/5.0/en/create-index.html

http://dev.mysql.com/doc/refman/5.0/en/create-table.html

.. _mysql_foreign_keys:

MySQL Foreign Keys
------------------

MySQL's behavior regarding foreign keys has some important caveats.

Foreign Key Arguments to Avoid
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

MySQL does not support the foreign key arguments "DEFERRABLE", "INITIALLY",
or "MATCH".  Using the ``deferrable`` or ``initially`` keyword argument with
:class:`.ForeignKeyConstraint` or :class:`.ForeignKey` will have the effect of
these keywords being rendered in a DDL expression, which will then raise an
error on MySQL.  In order to use these keywords on a foreign key while having
them ignored on a MySQL backend, use a custom compile rule::

    from sqlalchemy.ext.compiler import compiles
    from sqlalchemy.schema import ForeignKeyConstraint

    @compiles(ForeignKeyConstraint, "mysql")
    def process(element, compiler, **kw):
        element.deferrable = element.initially = None
        return compiler.visit_foreign_key_constraint(element, **kw)

.. versionchanged:: 0.9.0 - the MySQL backend no longer silently ignores
   the ``deferrable`` or ``initially`` keyword arguments of
   :class:`.ForeignKeyConstraint` and :class:`.ForeignKey`.

The "MATCH" keyword is in fact more insidious, and is explicitly disallowed
by SQLAlchemy in conjunction with the MySQL backend.  This argument is
silently ignored by MySQL, but in addition has the effect of ON UPDATE and ON
DELETE options also being ignored by the backend.   Therefore MATCH should
never be used with the MySQL backend; as is the case with DEFERRABLE and
INITIALLY, custom compilation rules can be used to correct a MySQL
ForeignKeyConstraint at DDL definition time.

.. versionadded:: 0.9.0 - the MySQL backend will raise a
   :class:`.CompileError` when the ``match`` keyword is used with
   :class:`.ForeignKeyConstraint` or :class:`.ForeignKey`.

Reflection of Foreign Key Constraints
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Not all MySQL storage engines support foreign keys.  When using the
very common ``MyISAM`` MySQL storage engine, the information loaded by table
reflection will not include foreign keys.  For these tables, you may supply a
:class:`~sqlalchemy.ForeignKeyConstraint` at reflection time::

  Table('mytable', metadata,
        ForeignKeyConstraint(['other_id'], ['othertable.other_id']),
        autoload=True
       )

.. seealso::

    :ref:`mysql_storage_engines`

.. _mysql_unique_constraints:

MySQL Unique Constraints and Reflection
---------------------------------------

SQLAlchemy supports both the :class:`.Index` construct with the
flag ``unique=True``, indicating a UNIQUE index, as well as the
:class:`.UniqueConstraint` construct, representing a UNIQUE constraint.
Both objects/syntaxes are supported by MySQL when emitting DDL to create
these constraints.  However, MySQL does not have a unique constraint
construct that is separate from a unique index; that is, the "UNIQUE"
constraint on MySQL is equivalent to creating a "UNIQUE INDEX".

When reflecting these constructs, the :meth:`.Inspector.get_indexes`
and the :meth:`.Inspector.get_unique_constraints` methods will **both**
return an entry for a UNIQUE index in MySQL.  However, when performing
full table reflection using ``Table(..., autoload=True)``,
the :class:`.UniqueConstraint` construct is
**not** part of the fully reflected :class:`.Table` construct under any
circumstances; this construct is always represented by a :class:`.Index`
with the ``unique=True`` setting present in the :attr:`.Table.indexes`
collection.


.. _mysql_timestamp_null:

TIMESTAMP Columns and NULL
--------------------------

MySQL historically enforces that a column which specifies the
TIMESTAMP datatype implicitly includes a default value of
CURRENT_TIMESTAMP, even though this is not stated, and additionally
sets the column as NOT NULL, the opposite behavior vs. that of all
other datatypes::

    mysql> CREATE TABLE ts_test (
        -> a INTEGER,
        -> b INTEGER NOT NULL,
        -> c TIMESTAMP,
        -> d TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        -> e TIMESTAMP NULL);
    Query OK, 0 rows affected (0.03 sec)

    mysql> SHOW CREATE TABLE ts_test;
    +---------+-----------------------------------------------------
    | Table   | Create Table
    +---------+-----------------------------------------------------
    | ts_test | CREATE TABLE `ts_test` (
      `a` int(11) DEFAULT NULL,
      `b` int(11) NOT NULL,
      `c` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
      `d` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
      `e` timestamp NULL DEFAULT NULL
    ) ENGINE=MyISAM DEFAULT CHARSET=latin1

Above, we see that an INTEGER column defaults to NULL, unless it is specified
with NOT NULL.   But when the column is of type TIMESTAMP, an implicit
default of CURRENT_TIMESTAMP is generated which also coerces the column
to be a NOT NULL, even though we did not specify it as such.

This behavior of MySQL can be changed on the MySQL side using the
`explicit_defaults_for_timestamp
<http://dev.mysql.com/doc/refman/5.6/en/server-system-variables.html
#sysvar_explicit_defaults_for_timestamp>`_ configuration flag introduced in
MySQL 5.6.  With this server setting enabled, TIMESTAMP columns behave like
any other datatype on the MySQL side with regards to defaults and nullability.

However, to accommodate the vast majority of MySQL databases that do not
specify this new flag, SQLAlchemy emits the "NULL" specifier explicitly with
any TIMESTAMP column that does not specify ``nullable=False``.   In order
to accommodate newer databases that specify ``explicit_defaults_for_timestamp``,
SQLAlchemy also emits NOT NULL for TIMESTAMP columns that do specify
``nullable=False``.   The following example illustrates::

    from sqlalchemy import MetaData, Integer, Table, Column, text
    from sqlalchemy.dialects.mysql import TIMESTAMP

    m = MetaData()
    t = Table('ts_test', m,
            Column('a', Integer),
            Column('b', Integer, nullable=False),
            Column('c', TIMESTAMP),
            Column('d', TIMESTAMP, nullable=False)
        )


    from sqlalchemy import create_engine
    e = create_engine("mysql://scott:tiger@localhost/test", echo=True)
    m.create_all(e)

output::

    CREATE TABLE ts_test (
        a INTEGER,
        b INTEGER NOT NULL,
        c TIMESTAMP NULL,
        d TIMESTAMP NOT NULL
    )

.. versionchanged:: 1.0.0 - SQLAlchemy now renders NULL or NOT NULL in all
   cases for TIMESTAMP columns, to accommodate
   ``explicit_defaults_for_timestamp``.  Prior to this version, it will
   not render "NOT NULL" for a TIMESTAMP column that is ``nullable=False``.

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