MySQL 5.7 C API Developer Guide
unsigned long mysql_get_server_version(MYSQL *mysql)
Returns an integer that represents the MySQL server version.
The value has the format XYYZZ
where X is the major version,
YY is the release level (or minor
version), and ZZ is the sub-version
within the release level:
major_version*10000 + release_level*100 + sub_version
For example, "5.7.44" is
returned as 50744.
This function is useful in client programs for determining whether some version-specific server capability exists.