如何將從mySQL中選擇列的結果拆分爲多個列

Question

我在MYSQL數據庫中有列想提取那列數據並將其拆分成多個列這裏是我想拆分的數據樣本

```

{"1744":"1","1745":"1","1747":"1","1748":"1","1749":"1","1750":"1"} 
{"1759":"1"} 
{"47":"1","48":"Ehebr","49":"1479977045596.jpg"} 

``` 我想這分爲兩列，像這樣與第一數據：

當你看到這個數據有不同的長度，並會升ike能夠分割任何長度的數據，看看這裏[How to split a resulting column in multiple columns 但我不認爲這就是我想要的結果，我到那裏就像這樣還想修剪所有其他花括號和報價數據。這裏是我到目前爲止的代碼 ```

SELECT combined,SUBSTRING_INDEX(combined , ':', 1) AS a, 
SUBSTRING_INDEX(SUBSTRING_INDEX(combined , ':', 2),':',-1) AS b, 
SUBSTRING_INDEX(SUBSTRING_INDEX(combined , ':', -2),':',1) AS c, 
SUBSTRING_INDEX(combined , ':', -1) AS d 
FROM tablefoo WHERE combined is not null; 

```

Answer 1

如果你能過程和遊標住

drop procedure if exists p; 
delimiter // 
CREATE DEFINER=`root`@`localhost` PROCEDURE `p`(
    IN `instring` varchar(255) 

) 
LANGUAGE SQL 
NOT DETERMINISTIC 
CONTAINS SQL 
SQL SECURITY DEFINER 
COMMENT '' 
begin 
declare tempstring varchar(10000); 
declare outstring varchar(100); 
declare c1 varchar(100); 
declare c2 varchar(100); 
declare checkit int; 
declare done int; 
DECLARE CUR1 CURSOR for SELECT t.col FROM T; 
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE; 

drop table if exists occursresults; 
create table occursresults (col1 varchar(20), col2 varchar(20)); 

open CUR1; 
read_loop: LOOP 
     FETCH CUR1 INTO tempstring; 

     if done then leave read_loop; end if; 

     set tempstring = replace(tempstring,'{',''); 
     set tempstring = replace(tempstring,'}',''); 
     set tempstring = replace(tempstring,'"',''); 
     set checkit = 0; 
     #select tempstring; 

     looper: while tempstring is not null and instr(tempstring,',') > 0 do 
       set checkit = checkit + 1; 
       if checkit > 100 then #In case of infinite loop 
        leave looper; 
       end if; 
       set outstring = substr(tempstring,1,instr(tempstring, ',') - 1); 
       set tempstring = ltrim(rtrim(replace(tempstring,concat(outstring,','),''))); 
       set c1 = substr(outstring,1,instr(outstring, ':') - 1); 
       set c2 = replace(outstring,concat(c1,':'),''); 
       INSERT INTO OCCURSRESULTS (COL1,COL2) VALUES (c1,c2); 
     #  select tempstring,outstring,c1,c2;  
     end while; 
     #select tempstring; 
     set outstring = tempstring; 
     set c1 = substr(outstring,1,instr(outstring, ':') - 1); 
     set c2 = replace(outstring,concat(c1,':'),''); 
     INSERT INTO OCCURSRESULTS (Col1,Col2) VALUES (c1,c2); 


end loop; 
close cur1; 

end // 

delimiter ; 

MariaDB [sandbox]> select * from t; 
+---------------------------------------------------------------------+ 
| col                 | 
+---------------------------------------------------------------------+ 
| {"1744":"1","1745":"1","1747":"1","1748":"1","1749":"1","1750":"1"} | 
| {"1759":"1"}              | 
| {"47":"1","48":"Ehebr","49":"1479977045596.jpg"}     | 
+---------------------------------------------------------------------+ 
3 rows in set (0.00 sec) 

MariaDB [sandbox]> 
MariaDB [sandbox]> call p(1); 
Query OK, 0 rows affected (0.65 sec) 

MariaDB [sandbox]> 
MariaDB [sandbox]> SELECT * FROM OCCURSRESULTS; 
+------+-------------------+ 
| col1 | col2    | 
+------+-------------------+ 
| 1744 | 1     | 
| 1745 | 1     | 
| 1747 | 1     | 
| 1748 | 1     | 
| 1749 | 1     | 
| 1750 | 1     | 
| 1759 | 1     | 
| 47 | 1     | 
| 48 | Ehebr    | 
| 49 | 1479977045596.jpg | 
+------+-------------------+ 
10 rows in set (0.00 sec)