MyBatis分页填充page对象

这里以一个项目中查询文章的操作来做说明：

1、涉及的相关JavaBean

Article.java

public class Article extends BaseDomain {/***置顶状态*/public static final String ARTICLE_TOP = "1";/*** 非置顶状态*/public static final String ARTICLE_UNTOP = "0";private String id;private String title;private String description;private String pic;private String content;private Long click;private Timestamp createTime;private Timestamp updateTime;private String categoryId;private String username;private Long commentNum;private String isTop = ARTICLE_UNTOP;private Category category;private List<Keyword> keywords;public String getId() {return id;}public void setId(String id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getDescription() {return description;}public void setDescription(String description) {this.description = description;}public String getPic() {return pic;}public void setPic(String pic) {this.pic = pic;}public String getContent() {return content;}public void setContent(String content) {this.content = content;}public Long getClick() {return click;}public void setClick(Long click) {this.click = click;}public Timestamp getCreateTime() {return createTime;}public void setCreateTime(Timestamp createTime) {this.createTime = createTime;}public Timestamp getUpdateTime() {return updateTime;}public void setUpdateTime(Timestamp updateTime) {this.updateTime = updateTime;}public String getCategoryId() {return categoryId;}public void setCategoryId(String categoryId) {this.categoryId = categoryId;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public Long getCommentNum() {return commentNum;}public void setCommentNum(Long commentNum) {this.commentNum = commentNum;}public String getIsTop() {return isTop;}public void setIsTop(String isTop) {this.isTop = isTop;}public List<Keyword> getKeywords() {return keywords;}public void setKeywords(List<Keyword> keywords) {this.keywords = keywords;}public Category getCategory() {return category;}public void setCategory(Category category) {this.category = category;}
}

Page.java:

public class Page<T> extends BaseDomain implements Serializable {private static int DEFAULT_PAGE_SIZE = 20;private long startIndex = 1; //当前记录开始数private int pageSize = DEFAULT_PAGE_SIZE; // 每页的记录数private long totalCount; // 总记录数private long totalPage; // 总页数private List<T> data; // 当前页中存放的记录,类型一般为List/*** 构造方法，只构造空页.*/public Page() {this(0, DEFAULT_PAGE_SIZE, 0, 0, new ArrayList());}/*** 构造方法** @param startIndex 当前记录起始数* @param pageSize  本页容量* @param totalCount 数据库中总记录条数* @param totalPage 数据库中总页数* @param data   本页包含的数据*/public Page(long startIndex, int pageSize, long totalCount, long totalPage, List<T> data) {this.startIndex = startIndex;this.pageSize = pageSize;this.totalCount = totalCount;this.totalPage = totalPage;this.data = data;}/*** 取该页当前页码,页码从1开始.*/public long getCurrentPage() {return startIndex / pageSize + 1;}/*** 该页是否有下一页.*/public boolean isHasNextPage() {return this.getCurrentPage() < this.getTotalPage();}/*** 该页是否有上一页.*/public boolean isHasPreviousPage() {return this.getCurrentPage() > 1;}public long getStartIndex() {return startIndex;}public void setStartIndex(long startIndex) {this.startIndex = startIndex;}public int getPageSize() {return pageSize;}public void setPageSize(int pageSize) {this.pageSize = pageSize;}public long getTotalCount() {return totalCount;}public void setTotalCount(long totalCount) {this.totalCount = totalCount;}public long getTotalPage() {return totalPage;}public void setTotalPage(long totalPage) {this.totalPage = totalPage;}public List<T> getData() {return data;}public void setData(List<T> data) {this.data = data;}
}

2、接口

ArticleDao.java

@Repository
public interface ArticleDao {/*** 分页查询函数** @param parameters* 参数通过map传递，需要参数 startIndex pageSize 以及 需要查询的参数*/public Page<T> pagedQuery(Map<String, Object> parameters);
}

3、配置文件

ArticleDaoMapper.xml:

<?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" >
<mapper namespace="top.eussi.dao.ArticleDao" ><!-- 分页查询 --><resultMap id="LightResultMap" type="Article" ><id column="id" property="id" jdbcType="VARCHAR" /><result column="title" property="title" jdbcType="VARCHAR" /><result column="description" property="description" jdbcType="VARCHAR" /><result column="pic" property="pic" jdbcType="VARCHAR" /><result column="content" property="content" jdbcType="VARCHAR" /><result column="click" property="click" jdbcType="INTEGER" /><result column="create_time" property="createTime" jdbcType="TIMESTAMP" /><result column="update_time" property="updateTime" jdbcType="TIMESTAMP" /><result column="category_id" property="categoryId" jdbcType="VARCHAR" /><result column="username" property="username" jdbcType="VARCHAR" /><result column="comment_num" property="commentNum" jdbcType="INTEGER" /><result column="is_top" property="isTop" jdbcType="VARCHAR" /></resultMap><resultMap type="Page" id="PageResultMap"><id column="startIndex" property="startIndex"/><id column="pageSize" property="pageSize"/><id column="totalCount" property="totalCount"/><id column="totalPage" property="totalPage"/><collection column="{startIndex=startIndex,pageSize=pageSize}" property="data" ofType="Article" select="getPageArticle"/></resultMap><sql id="Page_Column_Article" >id,title,description,pic,click,create_time,update_time,category_id,username,comment_num,is_top</sql><select id="getPageArticle" resultMap="LightResultMap" parameterType="hashmap" >select<include refid="Page_Column_Article" />from t_articleORDER BY create_time DESClimit #{startIndex}, #{pageSize}</select><!-- #是采用占用符, $是直接取到值 --><select id="pagedQuery" parameterType="hashmap" resultMap="PageResultMap">selectcount(1) totalCount,ceil(count(1)/${pageSize}) totalPage,${startIndex} startIndex,${pageSize} pageSizefrom t_article</select>
</mapper>

4、测试类：

articleDaoTest.java:

@ContextConfiguration("classpath*:/spring_conf/blog-dao.xml")
public class articleDaoTest extends AbstractTransactionalTestNGSpringContextTests{@Autowiredprivate ArticleDao articleDao;public void setArticleDao(ArticleDao articleDao) {this.articleDao = articleDao;}@Testpublic void getPageArticle() {Map<String, Object> hashMap = new HashMap<String, Object>();hashMap.put("startIndex", 1);hashMap.put("pageSize", 1);Page page = articleDao.pagedQuery(hashMap);System.out.println(page.toString());}
}

网上类似分页插件，拦截器实现的分页方式暂时未尝试，采用这种传统的分页方法，使用中最大的失误就是page中属性要和mapper文件中使用的属性对应上，花了较多时间，记录一下！！！

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MyBatis分页填充page对象

1、涉及的相关JavaBean

2、接口

3、配置文件

4、测试类：

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