Thread: Res: Question on NpgsqlParameter object

----- Original Message -----

From: Francisco Figueiredo Jr.

To: Oliveiros Cristina ; pgsql-interfaces@postgresql.org

Sent: Monday, May 28, 2007 11:32 PM

Subject: Res: [INTERFACES] Question on NpgsqlParameter object

Hi Oliveiros!

Unfortunately it is not possible with current state to get this text.

You will have to enable either Npgsql Log or postgresql log.

Just add those lines:

// Enable logging.
    NpgsqlEventLog.Level = LogLevel.Debug;
    NpgsqlEventLog.LogName = "NpgsqlTests.LogFile";

It will show you all the commands sent to server.

You can also get support from Npgsql mail list and forum. Check out Npgsql project page:

http://npgsql.projects.postgresql.org

I hope it helps.

 

--
Regards,

 

Francisco Figueiredo Jr.
http://fxjr.blogspot.com

 

Npgsql Lead Developer
http://npgsql.projects.postgresql.org

 

MonoBrasil Project Founder Member
http://monobrasil.softwarelivre.org

 

 

"My grandfather once told me that there are two kinds of people: those
who work and those who take the credit. He told me to try to be in the
first group; there was less competition there."
- Indira Gandhi

----- Mensagem original ----
De: Oliveiros Cristina <oliveiros.cristina@gmail.com>
Para: pgsql-interfaces@postgresql.org
Enviadas: Segunda-feira, 28 de Maio de 2007 14:36:52
Assunto: [INTERFACES] Question on NpgsqlParameter object

Hi, List.

I am not 100% sure if this is the right list, if it isnt please kindly re-direct me to the proper list.

I would like to see NpgsqlCommand.CommandText value after parameter substitution. I have a query that is not behaving correctly and I suspect strongly that  it has to do with parameters getting instantiated in unexpected ways.

How can I have access to query SQL text after parameter substitution ?

I try to look at CommandText Property immediately before calling ExecuteReader() method, but I get the text with all parameters unsubstituted.

Any Help/Comments/Advices deeply appreciated

Thanks in advance

Cheers,
Oliveiros

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Oliveiros Cristina wrote:
> Howdy, Francisco.
>  

Hi Oliveiros!

> Thank you for your fast reply.
> I'm gonna check this out.
> Actually I wasn't aware of the existence of the Npgsql mailing list,
> even though I use it exclusively to access the back end !
>  

No problem!
:)

>  
> But, maybe if I am a little more specific you can tell me what I am
> (potentially) doing wrong.
>  
> Can I use parameters to substitute a whole condition?
> For ex, is it possible to have a query like this?
>  
> SELECT *
> FROM t_tabela
> WHERE @condicao
>  

Nope, you can't. Any string substitution done by Npgsql is done with quotes.


> ?
>  
> My problems started yesterday when I started using parameters in this way.
> Before I've just used it in situations like this :
> SELECT *
> FROM t_tabela
> WHERE variacao >= @percentagem
>  
> and it always worked without the smallest problem.
> I wonder if it is legal to use NpgsqlParameters in the way I do now...
>  


Yes, the correct way of using parameters is like you had before.

I think you want to get some flexible non hardcoded sql's. But I think
you would need to do that in a higher layer. Did you have a look at
NHibernate? I think you could get some more flexible queries with it.

Else, you would need to provide that in some DAO classes.
Unfortunately, Npgsql can't be used to send arbitrary conditions like
you want. :(


I hope it helps.



Regards,

Francisco Figueiredo Jr.
http://fxjr.blogspot.com
Npgsql Lead Developer
http://pgfoundry.org/projects/npgsql
Mono Project Contributor
http://www.go-mono.com
MonoBrasil Project Founder Member
http://monobrasil.softwarelivre.org


- --- Would you tell me, please, which way I ought to go from here?- That depends a good deal on where you want to get
to.       -- Lewis Carroll "Alice's Adventures in Wonderland"
 
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