I would say this is one of the the many many mysql limitations, not a
web2py issue.

Massimo

On Oct 14, 8:17 pm, "richard.ree" <[email protected]> wrote:
> No error if unique=False.  The problem seems to be with the VARCHAR
> (512) UNIQUE.
>
> -Rick
>
> On Oct 14, 6:29 pm, mdipierro <[email protected]> wrote:
>
> > Do you have the error if unique=False?
>
> > Massimo
>
> > On Oct 14, 5:25 pm, "richard.ree" <[email protected]> wrote:
>
> > > The sql that fails is:
>
> > > CREATE TABLE expedition(
> > >         id INT AUTO_INCREMENT NOT NULL,
> > >         name VARCHAR(512) UNIQUE,
> > >         from_date DATE,
> > >         to_date DATE,
> > >         description LONGTEXT,
> > >         PRIMARY KEY(id)
> > > ) ENGINE=InnoDB CHARACTER SET utf8;
>
> > > The table definition is:
>
> > > db.define_table(
> > >     "expedition",
> > >     Field("name", "string", unique=True),
> > >     Field("from_date", "date"),
> > >     Field("to_date", "date"),
> > >     Field("description", "text")
> > >     )
>
> > > On Oct 13, 10:06 pm, mdipierro <[email protected]> wrote:
>
> > > > can you email me the sql.log immediately after the error occurs?
>
> > > > On Sep 22, 11:13 am, Yannick <[email protected]> wrote:
>
> > > > > Hello mate,
> > > > > Below you can find the error message that I received from Database
> > > > > (MySQL) when using the latest Web2py version: 1.67.1 BUT when I use an
> > > > > old version Web2py: 1.66.2, I have NO problem NO error using the same
> > > > > environment...
> > > > > I wonder why this new release complaint ?????
>
> > > > > Please let me if you have any hint ???
>
> > > > > Traceback (most recent call last):
> > > > >   File "/home/fedora/src/web2py/gluon/restricted.py", line 178, in
> > > > > restricted
> > > > >     exec ccode in environment
> > > > >   File "/home/fedora/src/web2py/applications/AppName/models/db.py",
> > > > > line 104, in <module>
> > > > >     buDefineTable.define_tables()
> > > > >   File "/home/fedora/src/web2py/applications/AppName/modules/
> > > > > dbDefinition.py", line 126, in define_tables
> > > > >     migrate = True)
> > > > >   File "/home/fedora/src/web2py/gluon/sql.py", line 1033, in
> > > > > define_table
> > > > >     query = t._create(migrate=migrate)
> > > > >   File "/home/fedora/src/web2py/gluon/sql.py", line 1368, in _create
> > > > >     self._db._execute(query)
> > > > >   File "/home/fedora/src/web2py/gluon/sql.py", line 739, in <lambda>
> > > > >     self._execute = lambda *a, **b: self._cursor.execute(*a, **b)
> > > > >   File "/usr/lib/python2.6/site-packages/MySQLdb/cursors.py", line
> > > > > 173, in execute
> > > > >     self.errorhandler(self, exc, value)
> > > > >   File "/usr/lib/python2.6/site-packages/MySQLdb/connections.py", line
> > > > > 36, in defaulterrorhandler
> > > > >     raise errorclass, errorvalue
> > > > > OperationalError: (1071, 'Specified key was too long; max key length
> > > > > is 767 bytes')
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