NAME

       odbx_get_option - Query backend for implemented options

SYNOPSIS

       #include <opendbx/api.h>

       int odbx_get_option (odbx_t* handle, unsigned int option, void* value);

DESCRIPTION

       odbx_get_option()  asks  the  backend  module  associated  to  handle  by  odbx_init() for
       implemented options and their current values. This function can be used at every stage  as
       long  as  handle  points  to  a  valid  connection  object. Its primary use is to find out
       supported features of the backend module and to enable them with odbx_set_option()  before
       the connection to the database server is established by calling odbx_bind().

       The  first  parameter  handle is the connection object created and returned by odbx_init()
       which becomes invalid as soon as it was supplied to odbx_finish().

       There are several option values defined as named constants in the odbx.h  header  file.  A
       few  of  them are for informational purpose only while most of the options can also be set
       to different option values by odbx_set_option() to change  the  behavior  of  the  backend
       module. The available options are:

       ODBX_OPT_API_VERSION
              The  API version implemented by the backend. Currently, it returns only zero and is
              reserved for the future

       ODBX_OPT_THREAD_SAFE
              If it is safe to use this backend and especially the native database client library
              in  an  application  which  uses  threads where more than one thread opens database
              connections via the OpenDBX library

       ODBX_OPT_TLS
              The  database  client  library  may  support  transmitting  all  data  securely  by
              encrypting the network traffic via SSL or TLS

       ODBX_OPT_MULTI_STATEMENTS
              The  database  server  may  be able to support multiple SQL statements in one query
              string sent via odbx_query()

       ODBX_OPT_PAGED_RESULTS
              All database servers and client libraries are able to transfer the records  row  by
              row.  Some  of them can also transfer multiple rows or even all at once to minimize
              server load, network traffic and latency. The downside  of  this  is  an  increased
              memory consumption

       ODBX_OPT_COMPRESS
              Support  of compressed network traffic between database client and server. This can
              lead to higher throughput if the network is the bottleneck

       ODBX_OPT_MODE
              Some database  servers  support  different  modes  of  operation,  e.g.  modes  for
              compliance  to  other  SQL implementations or completely different query languages.
              This option is available since OpenDBX 1.1.4

       value must be a pointer to an integer variable where the backend  module  will  store  the
       result  for  the  supplied option. If it's not stated otherwise, the value assigned to the
       value  parameter  by  odbx_get_option()  will  be  of  boolean  nature  and  therefore  is
       ODBX_ENABLE for a supported option or ODBX_DISABLE for an option which isn't supported.

RETURN VALUE

       odbx_get_option() returns ODBX_ERR_SUCCESS, or an error code whose value is less than zero
       if one of the operations couldn't be completed  successfully.  Possible  error  codes  are
       listed  in the error section and they can be feed to odbx_error() and odbx_error_type() to
       get further details.

ERRORS

       -ODBX_ERR_PARAM
              One of the supplied parameters is invalid or is NULL and this isn't allowed in  the
              used backend module or in the native database client library

       -ODBX_ERR_OPTION
              The  value  passed  to  the option parameter isn't one of the values listed in this
              manual. The content of value remains unchanged if this error occurs

SEE ALSO

       odbx_bind(), odbx_error(), odbx_error_type(), odbx_init(), odbx_set_option()

                                         21 October 2016                       odbx_get_option(3)