mybatis如何做分页处理

1.首先根据自己实际需求编写实体类

import java.io.Serializable;

public class User implements Serializable{  //最好将该实体类序列化

    private static final long serialVersionUID = 1L;
    
    private Integer id;
    private String name;
    private String birthday;
    private String gender;
    private String career;
    private String address;
    private String mobile;
    private String picPath;
    
    public User() {
    }

    public User(Integer id, String name, String birthday, String gender, String career, String address, String mobile,
            String picPath) {
        this.id = id;
        this.name = name;
        this.birthday = birthday;
        this.gender = gender;
        this.career = career;
        this.address = address;
        this.mobile = mobile;
        this.picPath = picPath;
    }


    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getBirthday() {
        return birthday;
    }
    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public String getCareer() {
        return career;
    }
    public void setCareer(String career) {
        this.career = career;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getMobile() {
        return mobile;
    }
    public void setMobile(String mobile) {
        this.mobile = mobile;
    }
    public String getPicPath() {
        return picPath;
    }
    public void setPicPath(String picPath) {
        this.picPath = picPath;
    }


    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", birthday=" + birthday + ", gender=" + gender + ", career="
                + career + ", address=" + address + ", mobile=" + mobile + ", picPath=" + picPath + "
                + "]";
    }
}

2.编写分页所需要的通用bean,这是关键的一步。如果你用的是easyUI框架写的管理系统，currPage，PageSize，total，totalPage，rows这几个参数是必须的。

import java.util.List;

public class PageNationBean<T> {
    //请求参数
    private Integer currPage=1;//当前页
    private Integer PageSize=10;//页面数据条数
    
    //响应数据
    private Integer total;    //数据的总记录数
    private Integer totalPage;//总页数
    private List<T> rows;
    
    public PageNationBean() {
    }
    
    public PageNationBean(Integer currPage, Integer pageSize, Integer total, Integer totalPage, List<T> rows) {
        this.currPage = currPage;
        this.PageSize = pageSize;
        this.total = total;
        this.totalPage = totalPage;
        this.rows = rows;
    }


    public Integer getCurrPage() {
        return currPage;
    }
    public void setCurrPage(Integer currPage) {
        this.currPage = currPage;
    }
    public Integer getPageSize() {
        return PageSize;
    }
    public void setPageSize(Integer pageSize) {
        PageSize = pageSize;
    }
    public Integer getTotal() {
        return total;
    }
    public void setTotal(Integer total) {
        this.total = total;
    }
    public Integer getTotalPage() {
        return totalPage;
    }
    public void setTotalPage(Integer totalPage) {
        this.totalPage = totalPage;
    }
    public List<T> getRows() {
        return rows;
    }
    public void setRows(List<T> rows) {
        this.rows = rows;
    }
    @Override
    public String toString() {
        return "
	PageNationBean [currPage=" + currPage + ", PageSize=" + PageSize + ", total=" + total + ", totalPage="
                + totalPage + ", rows=" + rows + "]";
    }
    
}

3.数据库中建好需要测试的表，插入一定量的数据是肯定的

4.编写映射接口

public interface UserMapper {

    PageNationBean<User> getUsersByPagenation(PageNationBean<User> userBean);

}

5.编写映射所需的xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- 命名空间与映射接口的全类名一致 -->
<mapper namespace="com.yc.us.mapper.UserMapper">
    
    <resultMap type="PageNationBean" id="PageNationBeanMap">
        <result column="pageSize" property="pageSize"/>
        <result column="currPage" property="currPage"/>
        <collection property="rows" column="{pageSize=pageSize,currPage=currPage}" select="getUsers"/>
    </resultMap>
    
    <!-- #是采用占用符    $是直接取到值 -->
    <select id="getUsersByPagenation" parameterType="PageNationBean" resultMap="PageNationBeanMap">
        select count(1) total,ceil(count(1)/${pageSize}) totalPage,${pageSize} pageSize,${currPage} currPage from profile
    </select>
    <select id="getUsers" resultType="User">
        select * from
        (select m.*,rownum rn from
        (select * from profile) m where ${currPage}*${pageSize} >=rownum)
        where rn > (${currPage}-1)*${pageSize}
    </select>
    
</mapper>

6.根据自己实际需求写一个测试类，进行实际测试