Il 11/05/15 04:44, IVINH ha scritto:
>
> Hi all,
>
> How DAL is supported json query?
> My test is on Web2py by source code v.2.10.3, PostgreSQL 9.4:
>
> db.define_table('person',
> Field('name','string'),
> Field('jdata','json'))
>
> db.person.insert(name='Adam',jdata='{"age":30}')
> print db.executesql('SELECT * FROM person WHERE (jdata ->> "age") >
> "20";')
>
> I get this error:
> Traceback (most recent call last):
> File "E:\GDriver\web2py\gluon\restricted.py", line 227, in restricted
> exec ccode in environment
> File "E:/GDriver/web2py/applications/form/models/db.py"
> <http://127.0.0.1:8000/admin/default/edit/form/models/db.py>, line 103, in
> <module>
> print db.executesql('SELECT * FROM hoso WHERE (jdata ->> "age") > "20";')
> File "E:\GDriver\web2py\gluon\packages\dal\pydal\base.py", line 1028, in
> executesql
> adapter.execute(query)
> File "E:\GDriver\web2py\gluon\packages\dal\pydal\adapters\base.py", line
> 1326, in execute
> return self.log_execute(*a, **b)
> File "E:\GDriver\web2py\gluon\packages\dal\pydal\adapters\base.py", line
> 1320, in log_execute
> ret = self.cursor.execute(command, *a[1:], **b)
> File "E:\GDriver\web2py\gluon\contrib\pg8000\core.py", line 573, in execute
> self._c.execute(self, operation, args)
> File "E:\GDriver\web2py\gluon\contrib\pg8000\core.py", line 1626, in execute
> self.handle_messages(cursor)
> File "E:\GDriver\web2py\gluon\contrib\pg8000\core.py", line 1774, in
> handle_messages
> raise self.error
> ProgrammingError: ('ERROR', '42703', 'column "age" does not exist')
Hi IVINH,
try using psycopg driver... I've used with success.
And maybe you need to cast your condition like:
'SELECT * FROM person WHERE cast(cast(jdata)::json ->> "age")::integer >
20;'
Let me know if it solves or if it's of any help.
M.
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