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MyBatis3-传递多个参数（Multiple Parameters）

2024-10-10 07:31:02   220人阅读

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

MyBatis3-传递多个参数（Multiple Parameters）


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