今天在一次查詢中，發生了一個非法參數異常，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類似的提示就是找不到xxx對應的方法，檢查方法是否存在、包名是否正確，這里的問題就是包名不正確導致的。

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> {/*** 通過商品id查詢評論* @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); }

這里是因為少了一層fresheveryday包，修改之后的代碼能正常運行

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> {/*** 通過商品id查詢評論* @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，文章就分享到這里了，感謝閱讀~

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