sqlite db is included with the SM installation. follow the directions on the wiki

war3source.ini

"database"   "default"


database.cfg change it DO NOT PASTE

"default"     
{
  "driver" "sqlite" //<--
  "host" "localhost" //<-- can leave alone
  "database" "sourcemod" //<-- change if you want, this is the name of the database
  "user" "username" //<-- leave alone sqlite doesnt have authentication
  "pass" "password" //<-- leave alone sqlite doesnt have authentication
//"timeout" "0" //<--leave alone
//"port" "0" //<--leave alone
}