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问题描述：

想要实现这个接口，同时传入planId和projectPlans，屡次报错。好在一路坎坷，解决了多方bug,最后终于搞定了

 void insertList(@Param("planId") Integer planId, @Param("projectPlans") List<ProjectPlan> projectPlans);

1 刚开始爆绑定失败

后来发现原来是我的xml文件没有写mapper后缀

2 多个参数传值用@Param失败

别人说用这个，但是发现根本不行，

    void insertList(@Param("planId") Integer planId, @Param("projectPlans") List<ProjectPlan> projectPlans);

  <insert id="insertList"  parameterType="java.util.Map">insert into nursing_project_plan (plan_id,project_id,execute_time,execute_cycle,execute_frequency,create_by, update_by, create_time, update_time,remark) values<foreach collection="projectPlans" item="project" separator=",">(#{planId},#{project.projectId},#{project.executeTime},#{project.executeCycle},#{project.executeFrequency},#{project.createBy},#{project.updateBy},#{project.createTime},#{project.updateTime},#{project.remark})</foreach></insert>

解决思路

报错信息

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.BindingException: Parameter 'customerIdList' not found. Available parameters are [arg0, collection, list]
解释：

解释：
当我们传递一个 List 实例或者数组作为参数对象传给 MyBatis。当你这么做的时候,MyBatis 会自动将它包装在一个 Map 中,用名称在作为键。List 实例将会以list 作为键,而数组实例将会以array作为键。所以，当我们传递的是一个List集合时，mybatis会自动把我们的list集合包装成以list为Key值的map。

错误代码：
mapper层

 void insertList(List<ProjectPlan>projectPlans );
//这个方法也是会错 void insertList(List<ProjectPlan>projectPlans ,Integer planId);

xml层

   <insert id="insertList"  >insert into nursing_project_plan (plan_id,project_id,execute_time,execute_cycle,execute_frequency,create_by, update_by, create_time, update_time,remark) values<foreach collection="projectPlans" item="project" separator=",">(#{planId},#{project.projectId},#{project.executeTime},#{project.executeCycle},#{project.executeFrequency},#{project.createBy},#{project.updateBy},#{project.createTime},#{project.updateTime},#{project.remark})</foreach></insert>

解决方法

• service层
  （封装成map)

  Map maps = new HashMap();maps.put("projectPlans", projectPlans);maps.put("planId", 2);nursingProjectPlanMapper.insertList(maps);

• mapper层

void insertList( Map maps);

• xml层

    <insert id="insertList" parameterType="java.util.Map">insert into nursing_project_plan (plan_id,project_id,execute_time,execute_cycle,execute_frequency,create_by, update_by, create_time, update_time,remark) values<foreach collection="projectPlans" item="project" separator=",">(#{planId},#{project.projectId},#{project.executeTime},#{project.executeCycle},#{project.executeFrequency},#{project.createBy},#{project.updateBy},#{project.createTime},#{project.updateTime},#{project.remark})</foreach></insert>

成功了