RE: select error with null string -- error code -209

Have a look at the COALESCE() function. You may want to wirte your
query as:

SELECT accountname, COALESCE(account, '') FROM
Account WHERE AccountID = %d

Hope that helps,

Mike Mascari
mascarm@mascari.com

-----Original Message-----
From:    HYip [SMTP:hualinyip@earthlink.net]
Sent:    Friday, May 04, 2001 11:48 AM
To:    pgsql-general@postgresql.org
Subject:    [GENERAL] select error with null string  -- error code -209

I am using following codes to get the accountname, and account from
the
Table Account;
accountname, and account are varchar(30) and it can be null.
The code has no problem when both accountname, and account are not
null.  It gives me an errror code of -209 when the account is null.
Anyone has any idea of fixing it.

the output looks like :
error in fetch -209

Thanks,


  EXEC SQL BEGIN DECLARE SECTION;
  char query_string[256];
  char name[30];
  char account[30];
   EXEC SQL END DECLARE SECTION;



  EXEC SQL CONNECT TO :dbname user :userid/:passwd;
  if(sqlca.sqlcode) {
    printf("error in connect\n");
    return FALSE;
  }
  sprintf(query_string, "SELECT accountname, account FROM Account
where
AccountID = %d", customerId);

  EXEC SQL PREPARE sql_command FROM :query_string;
  EXEC SQL DECLARE c_cursor2 CURSOR FOR sql_command;/* DECLARE a
cursor
*/
  EXEC SQL OPEN c_cursor2;
  if(sqlca.sqlcode) {
    printf("error in cursor\n");
    return FALSE;
  }
  EXEC SQL FETCH c_cursor2 INTO :name, :account;
  if(sqlca.sqlcode) {
    printf("error in fetch %d\n", sqlca.sqlcode);
    return FALSE;
  }



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