`SQL`编写判断是否为工作日函数编写

SQL编写判断是否为工作日函数编写

最近的自己在写一些功能,遇到了对于工作日的判断,我就看了看sql,来吧!~(最近就是好疲惫)

我们一起看看(针对ORACLE)

1.声明:

CREATE OR REPLACE PACKAGE GZYW_2109_1214.PKG_FUN_GETDAY_HDAY AS 
 /**  
  *  通过节假日代码获取指定的日期[查找基准日期前/后N自然/工作日的日期] 
  * 注：此函数只适用于节假日表中只保存了节假日日期（非工作日记录）的情况 , 
  * 警告：若没有设置范围内的节假日信息，此函数会计算出错误的返回日期 
  * _Stand_Date 基准日期, 
  * C_MKT_Code 节假日代码, 
  * N_Interval_Day 间隔天数(大于0向后查找,小于0向前查找,等于0返回基准日期), 
  * C_Type 日期类型 'W'工作日,'D'自然日,'DW'自然日递延至工作日 
  */ 
 Function GETDAY_HDAY(C_HDay_Code varchar2,D_Stand_Date date,N_Interval_Day int,C_Type varchar2) return Date; 
 END PKG_FUN_GETDAY_HDAY;

2.主体

CREATE OR REPLACE PKG_FUN_GETDAY_HDAY AS 
 Function getDay_HDay(C_HDay_Code varchar2, 
 D_Stand_Date date, 
 N_Interval_Day int, 
 C_Type varchar2) 
 return Date as 
 D_Return Date; /*返回的日期*/ 
 D_Start Date; /*区间开始日期*/ 
 D_End Date; /*区间结束日期*/ 
 D_Tmp Date; 
 N_Count int := 1; 
 C_Hday varchar2(20) := C_HDay_Code; 
 begin 
  D_Return := D_Stand_Date; 
 /*判断参数是否合法*/ 
 if (('W' != C_Type) AND ('D' != C_Type) and ('DW' != C_Type)) then 
 return D_Return; 
 else 
  if (('D' = C_Type) or ('DW' = C_Type)) then 
 D_Return := D_Stand_Date + N_Interval_Day; 
  else 
 /*工作日的推算*/ 
 D_Start := D_Stand_Date; 
 D_End := D_Stand_Date + N_Interval_Day; 
  D_Return := D_End; 
  while (true) loop 
  exit when N_Count = 0; 
  begin 
  if (N_Interval_Day >= 1) then 
 select /*+RESULT_CACHE*/ count(*) 
 into N_Count 
 from T_P_BI_HDAY_SUB a 
 where a.C_HDay_Code = C_Hday 
  and a.D_HDay > D_Start 
  and a.D_HDay <= D_End 
  and a.c_Date_Type = 'H' 
 and a.N_Check_State = 1; 
 if (N_Count > 0) then 
 D_Start := D_End; 
  D_End := D_End + N_Count; 
  D_Return := D_End; 
  else 
 exit; /*退出*/ 
  end if; 
  else 
  /*如果是逆序*/ 
  if (D_Start > D_End) then 
 D_Tmp := D_End; 
 D_End := D_Start; 
  D_Start := D_Tmp; 
  end if; 
  select /*+RESULT_CACHE*/ count(*) 
  into N_Count 
  from T_P_BI_HDAY_SUB a 
  where a.C_HDay_Code = C_Hday 
  and a.D_HDay >= D_Start 
  and a.D_HDay < D_End 
  and a.c_Date_Type = 'H' 
  and a.N_Check_State = 1; 
  if (N_Count > 0) then 
  D_End := D_Start; 
  D_Start := D_End - N_Count; 
  D_Return := D_Start; 
  else 
  exit; /*退出*/ 
  end if; 
  end if; 
  end; 
  end loop; 
  end if; 
  if ('DW' = C_Type) and (N_Interval_Day>0) then 
  N_Count:=1; 
  while (true) loop 
  exit when N_Count = 0; 
  select /*+RESULT_CACHE*/ count(*) 
  into N_Count 
  from T_P_BI_HDAY_SUB a 
  where a.C_HDay_Code = C_Hday 
  and a.D_HDay = D_Return 
 and a.c_Date_Type = 'H' 
  and a.N_Check_State = 1; 
  if N_Count!=0 then 
  D_Return:=D_Return+1; 
  end if; 
  end loop; 
  end if; 
  end if; 
  return D_Return; 
 end; 
 END PKG_FUN_GETDAY_HDAY;

3.检验

CN:基准日期(以哪个国家进行注明)

DATE ‘2023-10-08’:你要检验的日期

-1:代表去取前一日日期

‘W’:只取前面‘-1’也就是前一日的工作日

SELECT PKG_FUN_GETDAY_HDAY.GETDAY_HDAY('CN', DATE '2023-10-08', -1, 'W')   AS TEST_DATA  FROM  TEST_TABLE a  WHERE  ROWNUM<2;

运行结果: