hibernate的通用查询

package com.zking.util;

import org.hibernate.Session;
import org.hibernate.query.Query;

import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * hql的通用查询
 * sql Pagebean Class clz
 * 1.hql语句传过来拼接Countsql
 * 2.给命名参数赋值
 * 3.pageBean.settotal
 * 4.查询你所需要的结果集
 */
public class BaseDao {
    /**
     * 给命名参数赋值
     *
     * @param query
     * @param map
     */
    private void setParameters(Query query, Map<String, Object> map) {
        if (map == null || map.size() == 0) {
            return;
        }
        Object value;
        for (Map.Entry<String, Object> entry : map.entrySet()) {
            value = entry.getValue();
            if (value instanceof Collection) {
                query.setParameterList(entry.getKey(), (Collection) value);
            } else if (value instanceof Object[]) {
                query.setParameterList(entry.getKey(), (Object[]) value);
            } else {
                query.setParameter(entry.getKey(), value);
            }
        }


    }


    /**
     * 拼装hql语句，Counthql
     * 用于查询符合记录的所有记录数
     *
     * @param hql
     * @return
     */
    public String getCountSql(String hql) {
        int index = hql.toUpperCase().indexOf("FROM");
        return "select count(*) " + hql.substring(index);
    }

    /**
     * 通用查询
     * @param session
     * @param hql
     * @param map 含有命名参数的集合
     * @param pageBean
     * @return
     */
    protected  List executeQuery(Session session, String hql, Map<String, Object> map, PageBean pageBean) {
        if (pageBean != null && pageBean.isPagination()) {
            String countsql=getCountSql(hql);
            Query countquery=session.createQuery(countsql);
            this.setParameters(countquery,map);
            pageBean.setTotal(countquery.getSingleResult().toString());
            Query query = session.createQuery(hql);
            this.setParameters(query,map);
              query.setFirstResult(pageBean.getStartIndex());
              query.setMaxResults(pageBean.getRows());
            return query.list();
        } else {
            Query query = session.createQuery(hql);
            this.setParameters(query, map);
            return query.list();
        }
    }

}

此处使用到了Pagebean 一个分页的类 在这里也把代码贴出来

package com.zking.util;


import javax.servlet.http.HttpServletRequest;
import java.util.Map;

public class PageBean {
    private int page = 1;// 页码

    private int rows = 10;// 页大小

    private int total = 0;// 总记录数

    private boolean pagination = true;// 是否分页
    private String url;
    private Map<String, String[]> parameterMap;//所有参数集合
    /**
     *
     * @Title: setPageBean
     * @Description: (初始化对象的方法)
     * @param request
     * @return void
     */
    public void   setPageBean(HttpServletRequest request) {
        this.page=request.getParameter("page")==null?1:Integer.parseInt(request.getParameter("page"));
        this.rows=request.getParameter("rows")==null?5:Integer.parseInt(request.getParameter("rows"));
        // 只有jsp页面上填写pagination=false才是不分页
        this.setPagination(!"false".equals(request.getParameter("pagination")));
        this.setParameterMap(request.getParameterMap());
        this.setUrl(request.getRequestURL().toString());
    }
    /**
     *
     * @Title: getMaxPages
     * @Description: (最大页码数)
     * @return
     * @return int
     */
    public int getMaxPages() {
        return this.total%this.rows==0?this.total/this.rows:this.total/this.rows+1;
    }
    /**
     *
     * @Title: getNextPages
     * @Description: (下一页页码)
     * @return
     * @return int
     */
    public int getNextPages() {
        return this.page<getMaxPages()?this.page+1:getMaxPages();
    }

    /**
     *
     * @Title: getUpPages
     * @Description: (上一页)
     * @return
     * @return int
     */
    public int getUpPages() {
        return this.page-1>0?this.page-1:1;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public Map<String, String[]> getParameterMap() {
        return parameterMap;
    }

    public void setParameterMap(Map<String, String[]> parameterMap) {
        this.parameterMap = parameterMap;
    }

    public PageBean() {
        super();
        // TODO Auto-generated constructor stub
    }

    public PageBean(int page, int rows, int total, boolean pagination) {
        super();
        this.page = page;
        this.rows = rows;
        this.total = total;
        this.pagination = pagination;
    }

    public int getPage() {
        return page;
    }

    public void setPage(int page) {
        this.page = page;
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public void setTotal(String total) {
        this.total = Integer.parseInt(total);
    }

    public boolean isPagination() {
        return pagination;
    }

    public void setPagination(boolean pagination) {
        this.pagination = pagination;
    }

    /**
     * 获得起始记录的下标
     *
     * @return
     */
    public int getStartIndex() {
        return (this.page - 1) * this.rows;
    }

    @Override
    public String toString() {
        return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
    }
}