java – 获取mybatis中最后插入记录的id

,我的mapper xml是

<insert id="insertSelective"  parameterType="com.mycom.myproject.db.mybatis.model.FileAttachment" >
  <selectKey resultType="java.lang.Long" keyProperty="id" order="AFTER" >
  SELECT LAST_INSERT_ID() as id
</selectKey>
 insert into fileAttachment
<trim prefix="(" suffix=")" suffixOverrides="," >
  <if test="name != null" >
    name,
  </if>
  <if test="attachmentFileSize != null" >
    size,
  </if>      
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
  <if test="name != null" >
    #{name,jdbcType=VARCHAR},
  </if>
 <if test="attachmentFileSize != null" >
    #{attachmentFileSize,jdbcType=INTEGER},
  </if>
 </trim>
 </insert>

我认为这里写的语句’SELECT LAST_INSERT_ID()as id’应该返回最后插入记录的id但是我在插入记录后总是1.

我的mapper.java类我有方法

int insertSelective(FileAttachment record);

在我正在使用的dao课程中

int id = fileAttachmentMapper.insertSelective(fileAttachment);

插入新记录时,我的ID值始终为1.我的Id字段自动递增,记录正确插入.

id被注入对象：

int num_of_record_inserted = fileAttachmentMapper.insertSelective(fileAttachment);

int id = fileAttachment.getId();

selectKey做的是在你要插入的对象中设置id,在这种情况下,在fileAttachment中输入其属性id并插入AFTER记录.