Oracle 字符串分割

分割函数一：

字符串分割：

create or replace function Get_StrArrayLength
(
av_str varchar2, --要分割的字符串
av_split varchar2 --分隔符号
)
return number
is
lv_str varchar2(1000);
lv_length number;
begin
lv_str:=ltrim(rtrim(av_str));
lv_length:=0;
while instr(lv_str,av_split)<>0 loop
lv_length:=lv_length+1;
lv_str:=substr(lv_str,instr(lv_str,av_split)+length(av_split),length(lv_str));
end loop;
lv_length:=lv_length+1;
return lv_length;
end Get_StrArrayLength;

字符串提取：

create or replace function Get_StrArrayStrOfIndex
(
  av_str varchar2,  --要分割的字符串
  av_split varchar2,  --分隔符号
  av_index number --取第几个元素
)
return varchar2
is
  lv_str varchar2(1024);
  lv_strOfIndex varchar2(1024);
  lv_length number;
begin
  lv_str:=ltrim(rtrim(av_str));
  lv_str:=concat(lv_str,av_split);
  lv_length:=av_index;
  if lv_length=0 then
      lv_strOfIndex:=substr(lv_str,1,instr(lv_str,av_split)-length(av_split));
  else
      lv_length:=av_index+1;
     lv_strOfIndex:=substr(lv_str,instr(lv_str,av_split,1,av_index)+length(av_split),instr(lv_str,av_split,1,lv_length)-instr(lv_str,av_split,1,av_index)-length(av_split));
  end if;
  return  lv_strOfIndex;
end Get_StrArrayStrOfIndex;

 

分割函数二：

--本函数可以将“目标字符串”以“指定字符串”进行拆分，并通过表结构返回结果。代码如下：
CREATE OR REPLACE TYPE str_split IS TABLE OF VARCHAR2 (4000);
CREATE OR REPLACE FUNCTION splitstr(p_string IN VARCHAR2, p_delimiter IN VARCHAR2)
    RETURN str_split 
    PIPELINED
AS
    v_length   NUMBER := LENGTH(p_string);
    v_start    NUMBER := 1;
    v_index    NUMBER;
BEGIN
    WHILE(v_start <= v_length)
    LOOP
        v_index := INSTR(p_string, p_delimiter, v_start);

        IF v_index = 0
        THEN
            PIPE ROW(SUBSTR(p_string, v_start));
            v_start := v_length + 1;
        ELSE
            PIPE ROW(SUBSTR(p_string, v_start, v_index - v_start));
            v_start := v_index + 1;
        END IF;
    END LOOP;

    RETURN;
END splitstr;

事例一：

select Get_StrArrayLength('HJJHTSCYJD_TB13522018,HJJHTSCYJD_2012_TB13632018,HJJHTSCYJD_2013_TB13642018,HJJHTSCYJD_2014_TB13652018,HJJHTSCYJD_2015_TB13662018,HJJHTSCYJD_2016_TB13672018,HJJHTSCYJD_2017_TB16522018',',') from dual;

事例二：

select GET_STRARRAYSTROFINDEX('HJJHTSCYJD_TB13522018,HJJHTSCYJD_2012_TB13632018,HJJHTSCYJD_2013_TB13642018,HJJHTSCYJD_2014_TB13652018,HJJHTSCYJD_2015_TB13662018,HJJHTSCYJD_2016_TB13672018,HJJHTSCYJD_2017_TB16522018',',',1) from dual;

事例三：

select * from table(splitstr('HJJHTSCYJD_TB13522018,HJJHTSCYJD_2012_TB13632018,HJJHTSCYJD_2013_TB13642018,HJJHTSCYJD_2014_TB13652018,HJJHTSCYJD_2015_TB13662018,HJJHTSCYJD_2016_TB13672018,HJJHTSCYJD_2017_TB16522018',','));

事例四：对各个表总数据求和

SELECT sum("count") FROM
(select count(1) "count" from HJJHTSCYJD_TB13522018 union all 
 select count(1) "count" from HJJHTSCYJD_2012_TB13632018 union all 
 select count(1) "count" from HJJHTSCYJD_2013_TB13642018 union all 
 select count(1) "count" from HJJHTSCYJD_2014_TB13652018 union all 
 select count(1) "count" from HJJHTSCYJD_2015_TB13662018 union all 
 select count(1) "count" from HJJHTSCYJD_2016_TB13672018 union all
 select count(1) "count" from HJJHTSCYJD_2017_TB16522018);