Retrieving of PostgreSQL native error code - postgresql

Question

I have installed unixODBC-2.3.1-4.95.x86_64 on my SLES 12 machine and writing some application. But I faced with problem of error handling in PosgreSQL using unixODBC.
To do this I created the following function:
void checkDiag (SQLSMALLINT handleType, SQLHANDLE handle)
{
SQLRETURN rc = SQL_ERROR;
SQLCHAR sqlState[6];
SQLINTEGER nError;
SQLSMALLINT recnum = 0;
SQLCHAR eMsg[SQL_MAX_MESSAGE_LENGTH];
SQLCHAR nativeError[SQL_MAX_MESSAGE_LENGTH];
while (rc != SQL_NO_DATA_FOUND)
{
rc = SQLGetDiagRec (handleType,
handle,
recnum,
sqlState,
&nError,
eMsg,
255,
NULL);
if (rc != SQL_NO_DATA_FOUND)
{
SQLGetDiagField(handleType,
handle,
recnum,
SQL_DIAG_NATIVE,
nativeError,
255,
NULL);
printf("RECNUM %d\n sqlState = %s\n nError = %d\n Error Message %s\n nativeError %s \n",
recnum, sqlState, nError, (char *) eMsg, (char *)nativeError);
}
recnum++;
}
}
I have been trying to use different variants of diagId in SQLGetDiagField : SQL_DIAG_MESSAGE_TEXT, SQL_DIAG_NATIVE, SQL_DIAG_SQLSTATE.
I got everything but not PostgreSQL error Id.
I am constantly getting Postgresql error code id = -1.
So my question is:
Is it possible to get native PostgreSQL error code id using unixODBC API ?
Could you please tell me what I am doing wrong?

Answer 1

I found a solution.
The contents of the config file odbcinst.ini was the following:
[PostgreSQL]
Description=PostgreSQL ODBC driver
Driver=/usr/lib64/unixODBC/libodbcpsql.so
FileUsage=1
After I changed the description of Driver entry in the configuration file I was able to get PostgreSQL native error code.
[PostgreSQL]
Description=PostgreSQL ODBC driver
Driver=/opt/PostgreSQL/psqlODBC/lib/psqlodbcw.so
FileUsage=1
psqlodbcw.so library is supplied by EnterpriseDB PostgreSQL which can be downloaded here https://www.postgresql.org/download/linux/suse/ .
After these modifications I can get native error code. Using the code provided above, the postgres error code value will be written into sqlState.