Here, "a row" means a row in openvswitch configuration database, not "flow 
entry".
in other words,  "a row"  is  an object of class Row in 
contrib/ovs/db/idl.py
"database" is ovs configuration database, of course.
 
I have already successfully deleted a row.  
Here is my solution:
After invoking the delete method of a row object, I put the object into 
Transaction's _txn_rows. And it works.
 
But I think it should be put into _txn_rows automatically when invoking 
delete method, shouldn't it?
 
Anyway, thanks for your kind response.
 
Yang-Haixiang

> Date: Thu, 9 Jul 2015 10:37:39 +0900
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> Subject: Re: [Ryu-devel] Failed to delete a row
> 
> Hi,
> 
> Does "a row" mean "a flow entry of switch"? and "database" mean "flow table"?
> Can you tell us more information about your problems?
> 
> Thanks,
> Iwase
> 
> On 2015年07月08日 21:33, 杨haixiang wrote:
> > Hi all,
> >     I tried  to delete a row of database (I used the delete method of class 
> > row), but I failed.
> >     I am sure I have removed all references.
> >     I captured the packets with wireshark, but I can't find any messages 
> > that contains "delete" keyword.
> >     Could someone do me a favor?
> >     Thanks in advance.
> >  
> > Best Regards
> > Haixiang Yang
> > 
> > 
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