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 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);