forget it. it's weird that read lock for mysql is read only, i have to
obtain write lock. it seems not possible to block write access only.
On Wednesday, October 17, 2012 2:55:49 AM UTC+8, vince wrote:
>
> i tried to lock table but with error
> <class 'gluon.contrib.pymysql.err.InternalError'> (1099, u"Table
> 'publication' was locked with a READ lock and can't be updated")
>
> db.executesql('LOCK TABLE publication READ;')
> result = db(db.publication.id==pubid).select()[0]
> newlist = result.photo_list
> newlist.remove(int(pid))
> db(db.publication.id==pubid).update(photo_list=newlist)
> db.executesql('UNLOCK TABLES;')
>
> is it possible to use the same connection?
>
> On Thursday, October 11, 2012 9:32:14 PM UTC+8, Massimo Di Pierro wrote:
>>
>> You can try:
>>
>> db.executesql('LOCK TABLE tablename READ;')
>>
>>
>> http://aarklondatabasetrivia.blogspot.com/2009/04/how-to-lock-and-unlock-tables-in-mysql.html
>>
>>
>> On Thursday, 11 October 2012 01:44:14 UTC-5, vince wrote:
>>>
>>> can i lock a table as readonly during the transaction? the case is i
>>> need to insert a record to table B which is base on the query result of
>>> table A, i would like to lock table A as readonly until i finish the insert.
>>>
>>> i am using mysql at the moment. i know web2py may not have this feature,
>>> what is the best way to use mysql's 'lock table' on web2py?
>>>
>>> thanks in advance,
>>> vince
>>>
>>
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