Mysql分页_MySQL

select * from sjdr_product_detail; //一共17条数据

<code class="hljs haml">select * from sjdr_product_detail limit #{start},#{pageSize}; </code>

<code class="hljs haml"><code class="hljs cs">#第1页
select * from sjdr_product_detail limit 0,3;
#第2页
select * from sjdr_product_detail limit 3,3;
#第3页
select * from sjdr_product_detail limit 6,3;
#第4页
select * from sjdr_product_detail limit 9,3;
#第5页
select * from sjdr_product_detail limit 12,3;
#第6页
select * from sjdr_product_detail limit 15,3;</code></code>

<code class="hljs haml"><code class="hljs cs">0 = (1-1) * 3
3 = (2-1) * 3
6 = (3-1) * 3
9 = (4-1) * 3
12= (5-1) * 3
15= (6-1) * 3
</code></code>

<code class="hljs haml"><code class="hljs cs"><code class="hljs cs">package cn.sg.util;
/**
 * @author ZSL
 */
import java.util.ArrayList;
import java.util.List;

public class PageUtil {

    public PageUtil(int curr,int size,int total){

        this.pageSize = size;

        this.totalPage = total % size == 0 ? total/size : (total/size) + 1;

        this.currPage = curr < 1 ? 1 : curr;

        this.currPage = curr > this.totalPage ? this.totalPage : this.currPage;

        skips = (this.currPage - 1) * this.pageSize;

        this.totalCount = total;

    }

    private int currPage = 1;   //当前页

    private int pageSize = 10;  //每页显示条数

    private int totalPage = 0;  //总页数

    private int totalCount = 0; //总条数

    private int skips = 0;  //跳过的值，即sql中的start值

    private List rows = new ArrayList();    //用来存放查询到的数据集合

    //////////////////////////////////////////////////////
    //getter、setter 方法
    public int getCurrPage() {
        return currPage;
    }

    public void setCurrPage(int currPage) {
        this.currPage = currPage;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public int getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }

    public List getRows() {
        return rows;
    }

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

    public int getSkips() {
        return skips;
    }

    public void setSkips(int skips) {
        this.skips = skips;
    }
}
</code></code></code>

<code class="hljs haml"><code class="hljs cs"><code class="hljs cs"><code class="hljs xml"><!-- 查询数量 -->
<select id="getCount" resulttype="java.lang.Integer">
        select count(1) from sjdr_product_detail;
</select>
<!-- 分页查询 -->
<select id="queryByPage" resultmap="detail_resultMap" resulttype="Detail">
        select * from sjdr_product_detail order by P_ID DESC
        limit #{skips},#{pageSize};
</select></code></code></code></code>

<code class="hljs haml"><code class="hljs cs"><code class="hljs cs"><code class="hljs xml"><code class="hljs java">@RequestMapping("detail_page.htm")
    public void queryByPage(HttpServletRequest req, Model model){
        //当前页
        int curr = Integer.valueOf(req.getParameter("curr"));
        //每页显示条数
        int size = Integer.parseInt(req.getParameter("size"));

        //查询数量
        int total = this.detailService.getCount();
        PageUtil page = new PageUtil(curr, size, total);

        List<detail> detailList = this.detailService.queryByPage(page);
        page.setRows(detailList);

        //转成json格式
        WriteResponseUtil util = new WriteResponseUtil();
        util.writeResponse(JsonUtil.toJSONString(page), res);
    }   </detail></code></code></code></code></code>

<code class="hljs haml"><code class="hljs cs"><code class="hljs cs"><code class="hljs xml"><code class="hljs java"><code class="hljs cs">{
    "currPage": 1, //第一页
    "pageSize": 3, //每页显示条数
    "rows": [      //查询数据集合
        {
            "p_ID": "17",
            "p_PIC": "17777"
        },
        {
            "p_ID": "16",
            "p_PIC": "16666"
        },
        {
            "p_ID": "15",
            "p_PIC": "15555"
        }
    ],
    "skips": 0,               //相当于sql中的start
    "totalCount": 17,         //总条数
    "totalPage": 6            //总页数
}</code></code></code></code></code></code>