mybatis的mapper文件中，sql更新語句

sql語句中沒有對字段判斷

   <update id="updateByExample" parameterType="java.util.Map">
		update student
		set 
			name = #{record.name,jdbcType=VARCHAR},
			age = #{record.age,jdbcType=INTEGER},
			money = #{record.money,jdbcType=DECIMAL},
			cla_code = #{record.cla_code,jdbcType=VARCHAR},
			create_time = #{record.create_time,jdbcType=TIMESTAMP},
			del_flag = #{record.del_flag,jdbcType=CHAR}
		where id = #{record.id}
  </update>

sql語句中對字段判斷

  <update id="updateBySelective" parameterType="java.util.Map">
    update student
    <set>
      <if test="record.name != null">
        name = #{record.name,jdbcType=VARCHAR},
      </if>
      <if test="record.age != null">
        age = #{record.age,jdbcType=INTEGER},
      </if>
      <if test="record.money != null">
        money = #{record.money,jdbcType=DECIMAL},
      </if>
      <if test="record.cla_code != null">
        cla_code = #{record.cla_code,jdbcType=VARCHAR},
      </if>
      <if test="record.create_time != null">
        create_time = #{record.create_time,jdbcType=TIMESTAMP},
      </if>
      <if test="record.del_flag != null">
        del_flag = #{record.del_flag,jdbcType=CHAR},
      </if>
    </set>
    where id = #{record.id}
  </update>