package cn.com.basic.face.service.sqlite;

import cn.com.basic.face.discern.common.CommonVariables;

/**
 * Created by dpy on 2017/7/20.
 */

public class BaseDao {


    /**
     * 获取分页开始行
     * @param pageNum
     * @return
     */
    public int getStartIndex(Integer pageNum){
        if(pageNum == null || pageNum <= 0){
            return  0;
        }
        return (pageNum-1)*Integer.parseInt(CommonVariables.Page.DEFAULT_PAGE_SIZE);
    }

    /**
     * 获取总页数
     * @param total
     * @return
     */
    public int getTotalPageSize(Integer total){
        if(total == null || total <= 0){
            return  1;
        }
        int pageSize = Integer.parseInt(CommonVariables.Page.DEFAULT_PAGE_SIZE);
        return total%pageSize == 0 ? total/pageSize : total/pageSize + 1;
    }
}