MyBatis3传递多个参数(Multiple Parameters)

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 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 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 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 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 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 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 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

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