Using unixODBC to connect SAP HANA database

There are 2 methods of installing unixODBC:
(1) Use packages provides by OS vendors, such as:

yum install unixODBC

(2) Download the source code from unixODBC website, and build it:

./configure
make 
make install

Please notice: by default, the configuration files are in /etc/unixODBC:

# odbcinst -j
unixODBC 2.3.1
DRIVERS............: /etc/unixODBC/odbcinst.ini
SYSTEM DATA SOURCES: /etc/unixODBC/odbc.ini
FILE DATA SOURCES..: /etc/unixODBC/ODBCDataSources
USER DATA SOURCES..: /root/.odbc.ini
SQLULEN Size.......: 8
SQLLEN Size........: 8
SQLSETPOSIROW Size.: 8

And this may introduce the following connection error:

# isql HDB system xxxxxx -v
[08S01][unixODBC][SAP AG][LIBODBCHDB SO][HDBODBC] Communication link failure;-10709 Connect failed (no reachable host left)
[ISQL]ERROR: Could not SQLConnect

The solution is either you create a symbol link of /etc/odbc.ini which points to /etc/unixODBC/odbc.ini:

ln -s /etc/unixODBC/odbc.ini /etc/odbc.ini

Or when compiling from source code, specify the sysconfdir option in configuring process:

./configure --sysconfdir=/etc

The odbc.ini file is like this:

[HDB]
Driver = /usr/sap/hdbclient/libodbcHDB.so
servernode = localhost:30015

The 00 in 30015 is the instance number of SAP HANA.

When using isql to connect SAP HANA database, if not provide user name and password, the error message is a little confused:

# isql HDB -v
[08S01][unixODBC][SAP AG][LIBODBCHDB SO][HDBODBC] Communication link failure;-10709 Connection failed (RTE:[-1] Kerberos error. Major: "unspecified [851968]", minor: "No Kerberos credentials available [2529639053/-1765328243]")
[ISQL]ERROR: Could not SQLConnect

But after specifying the user name and password, the connection is OK:

# isql HDB system xxxxxx -v
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL>

Reference:
Connect to HANA with unixODBC fails.