Fix zero id failure on mysql
Fix zero id failure on mysql

zhang625272514/peewee,coreos/peewee,wenxer/peewee,new-xiaji/peewee,fuzeman/peewee,coleifer/peewee,coreos/peewee,d1hotpep/peewee,zhang625272514/peewee,bopo/peewee,jarrahwu/peewee,jnovinger/peewee,Sunzhifeng/peewee,coreos/peewee,fuzeman/peewee,softside/peewee,lez/peewee,zhang625272514/peewee,ronyb29/peewee,jarrahwu/peewee,jarrahwu/peewee,stas/peewee,d1hotpep/peewee,Dipsomaniac/peewee,coleifer/peewee,Dipsomaniac/peewee,Dipsomaniac/peewee,bopo/peewee,new-xiaji/peewee,Sunzhifeng/peewee,bopo/peewee,Sunzhifeng/peewee,coleifer/peewee,jnovinger/peewee,py4a/peewee,wenxer/peewee,new-xiaji/peewee,mackjoner/peewee,teserak/peewee,ghukill/peewee