MyBatis中if和choose的嵌套

上代码：

	
	
    SELECT t.addedId,t.taxType,t.totalSales,t.outputTax,t.inputTax,t.entryAmount, t.amountTax,t.retentionTax,
    t.createTime, t.taxTime,t.comId,c.comName,c.comType
    FROM t_g_vaddedtax AS t JOIN t_ucompany AS c ON c.comId = t.comId
	
	1=1
			 and c.comType = #{comType}
			 and t.taxTime =#{taxTime} 	
			 and t.taxType =#{taxType} 
			 and t.comId =#{comId} 	
			
				
					
						and t.createTime in ('${start_times}','${middle_times}', '${end_times}' )
					
					
						and t.createTime in ('${start_times}','${end_times}' )
					
				
			
			
				 	order by ${orderBy}  ${orderType}
			
			
					limit ${startRows},${pageSize}
			
	
	

功能实现之后反思：要不我不对“middle_times”判空？这样不就不用嵌套了吗？

	
	
    SELECT t.addedId,t.taxType,t.totalSales,t.outputTax,t.inputTax,t.entryAmount, t.amountTax,t.retentionTax,
    t.createTime, t.taxTime,t.comId,c.comName,c.comType
    FROM t_g_vaddedtax AS t JOIN t_ucompany AS c ON c.comId = t.comId
	
	1=1
			 and c.comType = #{comType}
			 and t.taxTime =#{taxTime} 	
			 and t.taxType =#{taxType} 
			 and t.comId =#{comId} 	
			
				and t.createTime in ('${start_times}','${middle_times}', '${end_times}' )
			
			
				 	order by ${orderBy}  ${orderType}
			
			
					limit ${startRows},${pageSize}