1》mybatis出现Result Maps collection already contains value for…BaseResultMap的错误

看是否存在两个id为BaseResultMap的resultMap，删除多余的，只保留一个就可以解决问题。

2. mybatis实现表字段增长

 <update id="updateCredits" parameterType="im.jinquan.my.model.TUser">UPDATE t_user set credits = credits + #{credits} where uid=1002</update>

3.mybatis插入某三个字段时一直报错，各种尝试直到

  <insert id="insertMyData" parameterType="im.jinquan.my.model.TBank">insert into t_bank (subject_id, chapter_id,question_type, question_name, option_1,option_2, option_3, option_4,option_5, option_6, answer,explain, remark,  from)values ( #{subjectId,jdbcType=INTEGER}, #{chapterId,jdbcType=INTEGER},#{questionType,jdbcType=INTEGER}, #{questionName,jdbcType=VARCHAR}, #{option1,jdbcType=VARCHAR},#{option2,jdbcType=VARCHAR}, #{option3,jdbcType=VARCHAR}, #{option4,jdbcType=VARCHAR},#{option5,jdbcType=VARCHAR}, #{option6,jdbcType=VARCHAR}, #{answer,jdbcType=VARCHAR},#{explain,jdbcType=VARCHAR}, #{remark,jdbcType=VARCHAR}, #{from,jdbcType=VARCHAR})</insert>

解决方案 加入 ``

  <insert id="insertMyData" parameterType="im.jinquan.my.model.TBank">insert into t_bank (subject_id, chapter_id,question_type, question_name, option_1,option_2, option_3, option_4,option_5, option_6, answer,`explain`, `remark`,  `from`)values ( #{subjectId,jdbcType=INTEGER}, #{chapterId,jdbcType=INTEGER},#{questionType,jdbcType=INTEGER}, #{questionName,jdbcType=VARCHAR}, #{option1,jdbcType=VARCHAR},#{option2,jdbcType=VARCHAR}, #{option3,jdbcType=VARCHAR}, #{option4,jdbcType=VARCHAR},#{option5,jdbcType=VARCHAR}, #{option6,jdbcType=VARCHAR}, #{answer,jdbcType=VARCHAR},#{explain,jdbcType=VARCHAR}, #{remark,jdbcType=VARCHAR}, #{from,jdbcType=VARCHAR})</insert>