Could also use keyvalues, add password etc.
PHP Code:
Handle hKv = CreateKeyValues("SQLConnection");
KvSetString(hKv "driver", "mysql");
KvSetString(hKv, "database", "yourdatabasename");
g_hDatabase = SQL_ConnectCustom(hKv, sError, sizeof(sError), true);
if (g_hDatabase == null)
{
SetFailState("%s", sError);
}