<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sincere.smartSearch.mapper.UserMapper" >

  <select id="selectStudentNumByStudentId" parameterType="java.lang.Integer" resultType="java.lang.String">
        select student_num from SZ_V_School_Student where student_id = #{studentId}
  </select>

</mapper>