SAP HANA中自定义Functions

create function schema名.函数名
(	
	in 参数 参数类型
)
returns 返回值 返回值类型
language sqlscript as
begin
	SQL语句
end;

create function SUSER.FV_MARA_MATNR
(	
	in i_matnr 		nvarchar(40)		--输入物料代码
)
returns o_matnr nvarchar(40)			--输出物料代码
language sqlscript as
begin
	if(:i_matnr <> '') then
		select case when length(replace_regexpr('[^0-9]' in :i_matnr))=length(:i_matnr) then
		left('000000000000000000',18-length(:i_matnr))||(:i_matnr) else :i_matnr end
		into o_matnr
		from dummy;
	else
		select :i_matnr into o_matnr from dummy;
	end if;
end;

select FV_MARA_MATNR('abc'), FV_MARA_MATNR('123'), FV_MARA_MATNR('00123'), FV_MARA_MATNR('abc999') from dummy;

abc		000000000000000123		000000000000000123		abc999

select * from mara where mandt=800 and matnr=3504	--attribute value is not a number
select * from mara where mandt=800 and matnr='3504'	--no record selected
select * from mara where mandt=800 and matnr=FF_MARA_MATNR('3504')	--selected record matnr='000000000000003504'

create function 函数名
(
	in 参数 参数类型
)
returns table
(
	字段 	字段类型
)
Language SQLScript as
Begin
  return
	SELECT 语句;
end;

create function FT_UTIL_SPLIT
(
	in i_Text 			nvarchar(4000) 	DEFAULT '',		--	字符串
	in i_splitChar 	nvarchar(1) 		DEFAULT ','		--	分隔符
)
returns table
(
	FCODE 	nvarchar(100)
)
Language SQLScript
as
Begin
  declare _items varchar(100) ARRAY;
  declare _text varchar(4000);
  declare _index integer;
  _text := :i_Text;
  _index := 1;

  WHILE LOCATE(:_text,i_splitChar) > 0 DO
  _items[:_index] := SUBSTR_BEFORE(:_text,i_splitChar);
  _text := SUBSTR_AFTER(:_text,i_splitChar);
  _index := :_index + 1;
  END WHILE;
  _items[:_index] := :_text;

  rst = UNNEST(:_items) AS ("FCODE");	--	存入临时表rst

  return
	SELECT * FROM :rst;
end;

select * from FT_UTIL_SPLIT('A/B/C/E/F','/');