Adding some comments

db.go

@@ -11,10 +11,6 @@ import (
 	"git.bit5.ru/backend/res_tracker"
 )
 
-const (
-	ChunkSizeForIN = 50000
-)
-
 type Settings struct {
 	Host, Port, User, Pass, Name, Prefix, Params string
 	Driver                                       string
@@ -45,6 +41,9 @@ func GetDBC(logger *colog.CoLog, s Settings) *DBC {
 	return dbc
 }
 
+//NOTE: In its current implementation this method creates a new Pool
+//      on each connection request. This is subotimal and should be
+//      addressed in a new version of the package
 func (dbc *DBC) con() *dbr.Connection {
 	if dbc._con == nil {
 		driver := dbc.s.Driver
@@ -52,9 +51,9 @@ func (dbc *DBC) con() *dbr.Connection {
 			driver = "mysql"
 		}
 		//NOTE: sql.Open(..) doesn't happen to return an error
-		sqlDb, _ := sql.Open(driver, dbc.s.ConnStr())
+		pool, _ := sql.Open(driver, dbc.s.ConnStr())
 
-		dbc._con = dbr.NewConnection(sqlDb, nil)
+		dbc._con = dbr.NewConnection(pool, nil)
 
 		res_tracker.Track(dbc)
 	}