Re: error codes in postgresql

-----Original Message-----
From: sandhya [mailto:sandhyar(at)amiindia(dot)co(dot)in]
Sent: Wednesday, August 17, 2005 6:16 PM
To: Sivakumar K
Cc: postgre; sandhya
Subject: Re: [ADMIN] error codes in postgresql

Thank you Sivakumar.

ExecStatusType PQresultStatus(const PGresult *res);

Will it return code or message.If i want to use this what should be the
return value of my function?

This will return whether your query was executed successfully or
not.

Onemore doubt..

char *PQresultErrorField(const PGresult *res, int fieldcode);

What is the use of this?What is the difference between the previous one and
this?

PG_DIAG_SQLSTATE--If i use this as my fieldcode will it take care of all my
error values.

Sorry for my basic questions.As i am very new to this i don't know how to
handle errors in

this.

This will return more detailed info regarding why the query execution was
not successful based on the fieldcode.

For example

If I execute select * from pg_databasesas (table does not exist)

PQresStatus (PQresultStatus (res)) will return PGRES_FATAL_ERROR

Whereas

PQresultErrorField (res, PG_DIAG_SQLSTATE) will return 42P01
which corresponds to "undefined table".

PQresultErrorField (res, PG_ DIAG_MESSAGE_PRIMARY) will return
relation "pg_databasesa" does not exist.

Note that the above API's will return information regarding
result set object only.

Normally we will be defining some errormessages according to the error codes
return by the PQErrorMessage function.

I really wonder if PQErrorMessage returns error codes. AFAIK it
returns error messages.

When i am using this even i declare my function as void..it is returning the
errormessage.

So..what iam planning is if i have some error codes returning from any of my
postgresql function i can define myown message for that and i can send it as
a return value to the main right!

Please tell me how can i handle this?

Why do you want to define your own error messages when the
appropriate error message is returned from PostgreSQL Server?

Please feel free to correct me

Thanks&Regards,

Sandhya

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

From: Sivakumar <mailto:sivakumark(at)aztec(dot)soft(dot)net> K

To: sandhya <mailto:sandhyar(at)amiindia(dot)co(dot)in>

Cc: Shashi Gireddy <mailto:gireddy(at)gmail(dot)com> ; postgre
<mailto:pgsql-admin(at)postgresql(dot)org>

Sent: Wednesday, August 17, 2005 5:49 PM

Subject: RE: [ADMIN] error codes in postgresql

Hi sandhya,

You can use PQresultStatus API to get the result status of the command
execution

And PQresStatus to convert the enumerated type returned by
PQresultStatus to a string constant.

For more information you can check the libpq API documentation

http://www.postgresql.org/docs/8.0/static/libpq-exec.html
<http://www.postgresql.org/docs/8.0/static/libpq-exec.html>

Is this what you want?

Regards,

Siva Kumar.K

-----Original Message-----
From: pgsql-admin-owner(at)postgresql(dot)org
<mailto:pgsql-admin-owner(at)postgresql(dot)org>
[mailto:pgsql-admin-owner(at)postgresql(dot)org] On Behalf Of sandhya
Sent: Wednesday, August 17, 2005 3:49 PM
To: Tom Lane
Cc: Shashi Gireddy; postgre
Subject: [ADMIN] error codes in postgresql

Hi,

I want to know ,if there is any way to return error codes/numbers as a
return value from the postgresql functions.

For ex:

If i am using my connection function say,

DbConnect(dname,uname,.........)

{

//here i use postgres connection function

pg_conn *conn;

conninfo="dbname=example(dname) user=postgres(uname)";

conn=PQConnectdb(conninfo)

//After connecting i need to create a table..and if the table exists

PQerrormessage(conn) will return error message...

But what i need is ..

Is there any other way of returning error number to my main program.

Can you please tell me how to handle these errors in my application.

I referred posgresql site..I didn't get any clear idea of it.

Any help please......

Thank you...

Regards,

Sandhya R