todo

在Linux/Unix下面访问WINDOWS SQLSERVER 的ODBC驱动程序

Handle closed connections by the dataserver (done)
Timeout open member connections. (done)
Open member connections on the fly. (done)
Add TDS_SRV_WAIT state when all members are in use. (done)
Handle SIGTERM (partial...add timeout to select() call)
Error checking is weak in several places.
Need to handle larger packet sizes
Add blob support
Add TDS 5/7 support