[Database] Retrieving sql statement result

Bob Sneidar bobs at twft.com
Thu Apr 29 14:34:50 CDT 2010


Hi Marcello. 

It's my understanding that only SQL statements that return a value of some kind will return the data you expect. To do what you are trying to do, you would need a persistent connection, and then a way to monitor that connection for any data coming back over the socket. I suppose the RevDB api could be improved to support the kinds of things you are trying to do, but presently Revolution does not making a direct persistent connection to the SQL database, but rather is acting as a broker between the two. Otherwise you would be able to create read/write cursors, modify the cursors, then commit them to the SQL database again, which you cannot. Much of my difficulty in using SQL with Revolution revolved around this limitation. 

I am willing to bet however, that you could accomplish this using shell commands. There are a great deal of posts in this forum about initiating shell sessions in the Mac terminal, or the Windows command line. 

Bob


On Apr 27, 2010, at 1:36 AM, Marcello Bertoli wrote:

> Hi all,
> 
> I have a question about runrev database commands. Is there a way to get the result of a sql statement that doesn't retrieve data (is not a select)? For example:
> 
> In a postgresql scenario I need to execute the statement:
> 
> "listen foo"
> 
> and I need to retrieve the result.
> 
> It seems that the only rev command I can use is revExecuteSql but in this way I can't get the result the sql engine gives after the statement is executed. revDataFromQuery seems to work only for retrieving data from a query, not from a statement...
> 
> Any ideas?
> 
> Thanks in advance
> Best Regards
> 
> Marcello_______________________________________________
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