Mapped Statements collection does not contain value for xxx问题解决方法

今天在一次查询中，发生了一个非法参数异常，提示

Mapped Statements collection does not contain value for cn.edu.sgu.www.mapper.CommentImageMapper.selectByCommentId

一般看到Mapped Statements collection does not contain value for xxx类似的提示就是找不到xxx对应的方法，检查方法是否存在、包名是否正确，这里的问题就是包名不正确导致的。

package cn.edu.sgu.www.fresheveryday.mapper;import cn.edu.sgu.www.fresheveryday.pojo.entity.Comment;
import cn.edu.sgu.www.fresheveryday.pojo.vo.CommentVO;
import cn.edu.sgu.www.fresheveryday.pojo.vo.UserSimpleVO;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Many;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;import java.util.List;@Repository
public interface CommentMapper extends BaseMapper<Comment> {/*** 通过商品id查询评论* @param productId 商品id* @return List<CommentVO>*/@Select("select id, content, type, user_id, comment_id, created from comment where product_id = #{productId}")@Result(column = "id", property = "id")@Result(column = "comment_id", property = "commentId")@Result(column = "id", property = "images",many = @Many(select = "cn.edu.sgu.www.mapper.CommentImageMapper.selectByCommentId"))@Result(column = "user_id", property = "user", javaType = UserSimpleVO.class,one = @One(select = "cn.edu.sgu.www.fresheveryday.mapper.UserMapper.selectSimpleUserById"))List<CommentVO> selectByProductId(int productId);
}

这里是因为少了一层fresheveryday包，修改之后的代码能正常运行

package cn.edu.sgu.www.fresheveryday.mapper;import cn.edu.sgu.www.fresheveryday.pojo.entity.Comment;
import cn.edu.sgu.www.fresheveryday.pojo.vo.CommentVO;
import cn.edu.sgu.www.fresheveryday.pojo.vo.UserSimpleVO;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Many;
import org.apache.ibatis.annotations.One;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;import java.util.List;@Repository
public interface CommentMapper extends BaseMapper<Comment> {/*** 通过商品id查询评论* @param productId 商品id* @return List<CommentVO>*/@Select("select id, content, type, user_id, comment_id, created from comment where product_id = #{productId}")@Result(column = "id", property = "id")@Result(column = "comment_id", property = "commentId")@Result(column = "id", property = "images",many = @Many(select = "cn.edu.sgu.www.fresheveryday.mapper.CommentImageMapper.selectByCommentId"))@Result(column = "user_id", property = "user", javaType = UserSimpleVO.class,one = @One(select = "cn.edu.sgu.www.fresheveryday.mapper.UserMapper.selectSimpleUserById"))List<CommentVO> selectByProductId(int productId);
}

好了，文章就分享到这里了，感谢阅读~

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