[update] Improve and optimize database connection
[update] Improve and optimize database connection

joshua317/Medoo,tytymnty/Medoo,guoxiaod/Medoo,taohaoge/Medoo,sythdev/Medoo,itplanes/Medoo,panada/medoo,52fhy/Medoo,hirdeshvishwdewa/Medoo,lcp0578/Medoo,turbopixel/Medoo,catfan/Medoo,poznet/Medoo,tvitcom/Medoo,afief/Medoo,liumingzhij26/Medoo,andriusGecius/Medoo,MantasPauliukonis/Medoo,SyuTingSong/Medoo,jockchou/Medoo