fix countSelect error when set sql cache, fix #208
fix countSelect error when set sql cache, fix #208

75team/thinkjs,Qihoo360/thinkjs,75team/thinkjs,maxzhang/thinkjs,thinkjs/thinkjs,akira-cn/thinkjs,maxzhang/thinkjs,maxzhang/thinkjs,akira-cn/thinkjs,akira-cn/thinkjs,snadn/thinkjs,75team/thinkjs