Insert query check if record exists - If not, Insert it [duplicate]
You can use below query. Here it will insert the ip_address when it is not present in your table.
INSERT INTO ip_list (ip_addr)SELECT * FROM (SELECT '192.168.100.1') AS tmpWHERE NOT EXISTS ( SELECT ip_addr FROM ip_list WHERE ip_addr='192.168.100.1');
You should add a UNIQUE key on ip_addr and then use INSERT IGNORE.
Maybe this helps if you haven't heard of UNIQUE yet: http://www.tutorialspoint.com/sql/sql-unique.htm
if I were you, I enforce a UNIQUE constraint on the column,
ALTER TABLE ip_list ADD CONSTRAINT IP_Unique UNIQUE(ip_addr)