mybatis遍历array数组与集合、json

遍历数组：

int saveOptions(@Param("items")String[] items, @Param("questionId")int questionId) throws Exception;

<insert id="saveOptions">
<foreach item="item" index="index" collection="items" separator=";">
insert into options values(#{item},#{questionId},1)
</foreach>
</insert>

遍历集合：参考之前文章：

 

20180626：嵌套list遍历

int saveOptions(@Param("list")List<List<String>> list) throws Exception;

<insert id="saveOptions">
        insert into options(optionsName,remark,selectOptions) values
        <foreach item="items"  collection="list" separator=",">
            (
            <foreach item="item"  collection="items" separator=",">
                #{item}
            </foreach>
            )
        </foreach>
    </insert>

其中collection="list"是指遍历的集合名称是list

item="items"是指遍历的每一项别名叫items


20190319传入json：

//传参：
JSONObject jsonParam= new JSONObject();
jsonParam.put("yananId=", 1);
jsonParam.put("yananName=","张三");
//接口
List<Map<String, Object>> getListByWhere(@Param("jsonParam")JSONObject jsonParam);

//mybatis
    <select id="getListByWhere" parameterType="net.sf.json.JSONObject" resultType="java.util.Map">
        select yananId,yananName
        from yanan 
        <foreach collection="jsonParam" open="where" separator="and" item="jsonValue" index="jsonKey">
            ${jsonKey} #{jsonValue}
        </foreach>
    </select>

打印sql：

select yananId,yananName from yanan where yananId=? and yananName =?


==> Parameters: 68(Integer), 张三(String)