I am recieving the below error when using postgres's embedded sql compiler "ecpg"
sql error No such connection NULL
The application compiles fine and I get the above error only when I run the compiled application. I must have the connection parameters wrong below and I have tried a couple different examples.
My dbname is TESTDB
it's hosted locally: localhost
the port is 5432
user is just postgres and the password is password
EXEC SQL CONNECT TO TESTDB 1 USER postgres IDENTIFIED BY password;
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
I am using a pre processor. Postgres provides a program called epcg which, is postgres's version of something called Embedded SQL.
I have to work within this framework, as much as the PGConn and PQconnectdb objects might be easier or better to use I cannot use these.
Thank you for trying, but I am looking for answer that is within Postgres's Embedded SQL Preprocessor.
>>>> but I am looking for answer that is within Postgres's Embedded SQL Preprocessor.
No probs. But the connect within Embedded SQL must have the same connection information as in the connect string, i. e. you would need to specifiy localhost and port somehow. Also see that 'TESTDB' was within quotes in the connect string while in teh EXEC statement it is without.
EXEC SQL BEGIN DECLARE SECTION;
const char *target = "TESTDB";
const char *user = "postgres";
const char *password = "password";
EXEC SQL END DECLARE SECTION;
...
EXEC SQL CONNECT TO :target USER :user IDENTIFIED BY :password;
you can tryfully qualifying target if that fails ie
const char *target = "unix:postgresql://localho
or
const char *target = "unix:postgresql://localho
Business Accounts
Answer for Membership
by: itsmeandnobodyelsePosted on 2009-10-12 at 00:26:03ID: 25549132
You should have a connect string like
char connectstring[] = "host=localhost port=5432 user=postgres password=password dbname='TESTDB'";
and connect like
PGconn * conninfo = NULL;
conninfo = PQconnectdb(connectstring)
Finally check for error like
if (PQstatus(conninfo) == CONNECTION_BAD)
{
/* error handling */
}
else if (PQstatus(conninfo) == CONNECTION_OK)
{
/* ok */
}
else
{
/* shouldn't occur */
}