How to get a list of hosts connected to a mysql server

I am trying to get a list of hosts connected to a mysql server. How can i get this? 开发者_JS百科What should i do after connecting to the mysql server.

Code snippets will really help.

Also whats the best api to use to connect to mysql using c++?

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One way you could do it is to execute the query show processlist, which will give you a table with Id, User, Host, db, Command, Time, State and Info columns. Remember that your show processlist query will be part of the output.

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You can try this query: select distinct host from information_schema.processlist; For example, there are multiple connections from 10.9.0.10 and one local connection.

mysql> select distinct host from information_schema.processlist; +-----------------+ | host | +-----------------+ | 10.9.0.10:63668 | | 10.9.0.10:63670 | | 10.9.0.10:63664 | | 10.9.0.10:63663 | | 10.9.0.10:63666 | | 10.9.0.10:63672 | | 10.9.0.10:63665 | | 10.9.0.10:63671 | | 10.9.0.10:63669 | | 10.9.0.10:63667 | | localhost | | | +-----------------+ 12 rows in set (0,00 sec) If you want only hosts (not different connections), you can try something like this: select distinct substring_index(host,':',1) from information_schema.processlist; Example: mysql> select distinct substring_index(host,':',1) from information_schema.processlist; +-----------------------------+ | substring_index(host,':',1) | +-----------------------------+ | 10.9.0.10 | | localhost | | | +-----------------------------+ 3 rows in set (0,00 sec) You can see, that MySQL shows me one empty row, it is normal (i have a deamon process): mysql> select distinct substring_index(host,':',1),`command` from information_schema.processlist; +-----------------------------+---------+ | substring_index(host,':',1) | command | +-----------------------------+---------+ | 10.9.0.10 | Sleep | | localhost | Query | | | Daemon | +-----------------------------+---------+ You can remove it with where `command`!="Daemon" or where `host`!='' And here is good link with query which also count connections from host and show which users are connected: http://blog.shlomoid.com/2011/08/how-to-easily-see-whos-connected-to.html