传递多个参数一般用在查询上,比如多个条件组成的查询,有以下方式去实现:
版本信息:
MyBatis:3.4.4
1、自带方法
<select id="getUserArticlesByLimit" resultMap="resultUserArticleList"> select user.id,user.userName,user.userAddress,article.id as aid,article.title,article.content from user,article where user.id=article.userid and user.id=#{arg0} limit #{arg1},#{arg2} </select>
public List<Article> getUserArticlesByLimit(int id,int start,int limit);
List<Article> articles=userMapper.getUserArticlesByLimit(1,0,2);
说明,arg0...也可以写成param0...
2、直接传递对象
<select id="dynamicIfTest" parameterType="Article" resultType="Article"> select * from article where 1 = 1 <if test="title != null"> and title = #{title} </if> <if test="content != null"> and content = #{content} </if> limit 1 </select>
public Article dynamicIfTest(Article article);
Article inArticle = new Article(); inArticle.setTitle("test_title"); Article outArticle = userOperation.dynamicIfTest(inArticle);
3、使用@Praam标注
<select id="dynamicChooseTest" resultType="Article"> select * from article where 1 = 1 <choose> <when test="title != null"> and title = #{title} </when> <when test="content != null"> and content = #{content} </when> <otherwise> and tile = "test_title" </otherwise> </choose> </select>
public Article dynamicChooseTest( @Param("title") String title, @Param("content") String content);
Article outArticle2 = userOperation.dynamicChooseTest("test_title",null);
说明:这种方法同样可以用在一个参数的时候。
4、使用HashMap
<select id="getArticleBeanList" resultType="ArticleBean"> select * from article where id = #{id} and name = #{code} </select>
说明:parameterType="hashmap"可以不用写。
public List<ArticleBean> getArticleBeanList(HashMap map);
HashMap<String, Object> map = new HashMap<String, Object>(); map.put("id", 1); map.put("code", "123"); List<Article> articless3 = userOperation.getArticleBeanList(map);
特殊的HashMap示例,用在foreach节点:
<select id="dynamicForeach3Test" resultType="Article"> select * from article where title like "%"#{title}"%" and id in <foreach collection="ids" index="index" item="item" open="(" separator="," close=")"> #{item} </foreach> </select>
public List<Article> dynamicForeach3Test(Map<String, Object> params);
HashMap<String, Object> map = new HashMap<String, Object>(); map.put("title", "title"); map.put("ids", new int[]{1,3,6}); List<Article> articless3 = userOperation.dynamicForeach3Test(map);
5、List结合foreach节点一起使用
<select id="dynamicForeachTest" resultType="Article"> select * from article where id in <foreach collection="list" index="index" item="item" open="(" separator="," close=")"> #{item} </foreach> </select>
public List<Article> dynamicForeachTest(List<Integer> ids);
List<Integer> ids = new ArrayList<Integer>(); ids.add(1); ids.add(3); ids.add(6); List<Article> articless = userOperation.dynamicForeachTest(ids);
6、数组结合foreach节点一起使用
<select id="dynamicForeach2Test" resultType="Article"> select * from article where id in <foreach collection="array" index="index" item="item" open="(" separator="," close=")"> #{item} </foreach> </select>
public List<Article> dynamicForeach2Test(int[] ids);
int[] ids2 = {1,3,6}; List<Article> articless2 = userOperation.dynamicForeach2Test(ids2);
参考:
http://www.yihaomen.com/article/java/426.htm
时间: 2024-10-11 21:00:02