Mike,
Thanks very much for your quick response. Now it works, sqlite works
fine, and the result from mysql seems not exact what I need, see below.
......
from sqlalchemy.types import TypeDecorator, String
class character_type(TypeDecorator):
def __init__(self, length):
self.impl = String(length).with_variant(String(length,
collation='utf8_general_ci'), 'mysql').with_variant(String(length,
collation='NOCASE'), 'sqlite')
def __repr__(self):
return "character_type(%d)" % self.impl.length
def upgrade():
### commands auto generated by Alembic - please adjust! ###
op.create_table('atable',
sa.Column('name', character_type(length=200), nullable=True),
sa.PrimaryKeyConstraint()
)
......
and after running 'alembic upgrade head', created table in mysql:
CREATE TABLE `atable` (
*`name` varchar(200) CHARACTER SET utf8 DEFAULT NULL*
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
and created table in sqlite:
CREATE TABLE atable (
name VARCHAR(200) COLLATE "NOCASE"
);
Do I need to change something in the code?
On Friday, December 7, 2012 4:15:18 PM UTC-5, Michael Bayer wrote:
>
> On Dec 7, 2012, at 4:01 PM, junepeach wrote:
>
> Thank you Mike and Audrius, this is very helpful. I have installed
> SQLAlchemy 0.8.0b1 and tried the code Mike gave to me:
> Base = declarative_base()
>
> def character_type(length):
> return String(length).with_variant(String(length,
> collation='utf8_general_ci'), 'mysql').with_variant(String(length,
> collation='NOCASE'), 'sqlite')
>
> Atable = Table("atable", Base.metadata,
> Column("name", character_type(200))
> )
>
> It works in sqlalchemy, but not in alembic.
> after running 'alembic revision --autogenerate', and got migration code:
>
> def upgrade():
> ### commands auto generated by Alembic - please adjust! ###
> op.create_table('atable',
> sa.Column('name', sa.*Variant*(length=200), nullable=True),
> sa.PrimaryKeyConstraint()
> )
>
>
> OK, Alembic autogen isn't doing __repr__() for "variant" correctly right
> now, we can look into that (added
> http://www.sqlalchemy.org/trac/ticket/2628) , for now you'd need to put
> your character_type() into the migration scripts manually, or subclass
> TypeDecorator to do it:
>
> from sqlalchemy.types import TypeDecorator
>
> class character_type(TypeDecorator):
> def __init__(self, length):
> self.impl = String(length).with_variant(... everything from before
> ...)
>
> def __repr__(self):
> return "character_type(%d)" % self.impl.length
>
>
>
>
> Surely 'Variant' is strange to me, but I have no idea, then I got
> below after I typed command 'alembic upgrade head':
> INFO [alembic.migration] Context impl MySQLImpl.
> INFO [alembic.migration] Will assume non-transactional DDL.
> INFO [alembic.migration] Running upgrade None -> 1ba36c080bdb
> Traceback (most recent call last):
> File "/usr/local/bin/alembic", line 9, in <module>
> load_entry_point('alembic==0.3.6', 'console_scripts', 'alembic')()
> File
> "/usr/local/lib/python2.7/dist-packages/alembic-0.3.6-py2.7.egg/alembic/config.py",
>
> line 229, in main
> **dict((k, getattr(options, k)) for k in kwarg)
> File
> "/usr/local/lib/python2.7/dist-packages/alembic-0.3.6-py2.7.egg/alembic/command.py",
>
> line 121, in upgrade
> script.run_env()
> File
> "/usr/local/lib/python2.7/dist-packages/alembic-0.3.6-py2.7.egg/alembic/script.py",
>
> line 192, in run_env
> util.load_python_file(self.dir, 'env.py')
> File
> "/usr/local/lib/python2.7/dist-packages/alembic-0.3.6-py2.7.egg/alembic/util.py",
>
> line 185, in load_python_file
> module = imp.load_source(module_id, path, open(path, 'rb'))
> File "alembic/env.py", line 76, in <module>
> run_migrations_online()
> File "alembic/env.py", line 69, in run_migrations_online
> context.run_migrations()
> File "<string>", line 7, in run_migrations
> File
> "/usr/local/lib/python2.7/dist-packages/alembic-0.3.6-py2.7.egg/alembic/environment.py",
>
> line 467, in run_migrations
> self.get_context().run_migrations(**kw)
> File
> "/usr/local/lib/python2.7/dist-packages/alembic-0.3.6-py2.7.egg/alembic/migration.py",
>
> line 211, in run_migrations
> change(**kw)
> File "alembic/versions/1ba36c080bdb_.py", line 25, in upgrade
> sa.Column('name', sa.Variant(length=200), nullable=True),
> AttributeError: 'module' object has no attribute 'Variant'
>
> Did alembic accept user defined data type? Can I get it to my alembic
> migration script?
>
> Thank you very much for your help!
>
>
> On Friday, December 7, 2012 11:28:01 AM UTC-5, Audrius Kažukauskas wrote:
>
>> On Thu, 2012-12-06 at 17:43:45 -0800, junepeach wrote:
>> > How to upgrade to a newer sqlalchemy version? I can not find a related
>> > document. Should I just use pip to install the current one? Will both
>> > version conflict?
>>
>> The answer depends on how and where SA is installed already. The best
>> way IMHO is to use separate virtualenvs for each of your projects (if
>> you're not doing this already). Since SQLAlchemy 0.8 is not released
>> yet, you'd need to issue pip (from within virtualenv) as follows:
>>
>> pip install -U -e hg+
>> https://bitbucket.org/sqlalchemy/sqlalchemy#egg=SQLAlchemy
>>
>> --
>> Audrius Kažukauskas
>> http://neutrino.lt/
>>
>
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