1.mysql函式： 判斷一個字串裡面包含幾個‘；’

drop function if exists func_containumsplit;
create function func_containumsplit(targetstr varchar(500)) 
returns INT
begin-- 函式頭
     DECLARE total INT DEFAULT 0;
    DECLARE endnum INT DEFAULT 1;
     SET targetstr=SUBSTR(targetstr FROM 2 FOR LENGTH(targetstr));
     while endnum<>0 DO -- 迴圈開始
      set endnum=(select POSITION(';' IN targetstr));
      set targetstr=(select SUBSTR(targetstr FROM endnum+1));
      set total=total+1;
    end while;
    return total-1;
end;
 

呼叫方法:

select func_containumsplit('65f37497-8edc-4e2f-91f6-47f8d8ac901d;19f69ea8-be70-47cf-a980-3e292577a288;19f69ea8-be70-47cf-a980-3e292577a288')

判斷字串中包含幾個‘；’ 返回結果 2

2.mysql函式判斷一個字串裡面是否包含‘；’

drop function if exists func_issplit;
create function func_issplit(targetstr varchar(500)) 
returns varchar (255)
begin-- 函式頭
    DECLARE total INT DEFAULT 0;
    SET targetstr=SUBSTR(targetstr FROM 2 FOR LENGTH(targetstr));
    set @num=(select POSITION(';' IN targetstr));
    if(@num>10) then return 1;
    ELSE return 0;
    end if;
end;
 

 呼叫方法:

select func_issplit('65f37497-8edc-4e2f-91f6-47f8d8ac901d;19f69ea8-be70-47cf-a980-3e292577a288;19f69ea8-be70-47cf-a980-3e292577a288')

返回結果 1，如果不包含；返回結果 0

3.mysql 根據索引對字串進行分割

drop function if exists func_split;
create function func_split(targetstr varchar(500),indexnum INT) 
returns varchar (255)
begin-- 函式頭
    declare i int default 0;
    declare beginnum int DEFAULT 0;
    while i<=indexnum DO -- 迴圈開始
      set @endnum=(select POSITION(';' IN targetstr));
       if(i+1<=indexnum) then
         set targetstr=(select SUBSTR(targetstr FROM @endnum+1));
       ELSEIF(@endnum<>0) THEN
         set targetstr=(select left(targetstr,@endnum-1));
       ELSE 
         set targetstr=targetstr;
       end if;
      set i=i+1;
    end while; 
    return targetstr;
end;
 

呼叫方法:(索引從0開始)

select func_split('65f37497-8edc-4e2f-91f6-47f8d8ac901d;19f69ea8-be70-47cf-a980-3e292577a288;19f69ea8-be70-47cf-a980-3e292577a283',1);

返回結果:

19f69ea8-be70-47cf-a980-3e292577a288