org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.coder520.mamabike.user.dao.UserMapper.selectByPrimaryKey

这个异常是IDEA中漏加载mapper.xml文件，在classes中没找到，所以要在配置文件中加入：

!--如果不添加此节点mybatis的mapper.xml文件都会被漏掉。-->
  <build>
   <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
      </resource>
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
      </resource>
    </resources>
  </build>