<sql id="queryWhereId">
		from sys_logs 
		<where>
			<if test="username!=null and username != ''">
				username like concat('%' , #{username} , '%')
			</if>
		</where>
	</sql>
	<!-- 基于用户名,动态拼接sql实现数据库查询 -->
	<select id="findPageObjects" resultType="com.edut.springboot.tarena.pojo.SysLog">
	select * 
		<include refid="queryWhereId" />
		order by createdTime desc 
		limit #{startIndex} , #{pageSize}
	</select>