<update id="updateEmpsByConditionSet" >
    	update emptest 
    	<set>
    		<if test="ename!=null">
    			ename = #{ename},
    		</if>
    		<if test="job != null">
    			job = #{job},
    		</if>
    		<if test="hiredate!=null">
    			hiredate = #{hiredate}
    		</if>
    	</set>
    	where empno = #{empno}
    </update>