将Db里的静态变量comparison和selectSql改为原型上的属性
将Db里的静态变量comparison和selectSql改为原型上的属性

74sharlock/thinkjs,75team/thinkjs,akira-cn/thinkjs,lukw00/thinkjs,maxzhang/thinkjs,Qihoo360/thinkjs,maxzhang/thinkjs,maxzhang/thinkjs,74sharlock/thinkjs,akira-cn/thinkjs,lukw00/thinkjs,75team/thinkjs,akira-cn/thinkjs,snadn/thinkjs,thinkjs/thinkjs,75team/thinkjs