Question

我在MYSQL数据库中有一列想要提取该列数据并将其拆分成多列这里是我要分割的数据样本

```

this.FormGroup.updateValueAndValidity()

``` 我想用第一个数据将它分成两列，如下所示：

正如您所注意到的那样，这些数据有不同的长度，并且希望能够分割任意长度的数据，看看这里[How to split a resulting column in multiple columns 但我不认为这就是我想要的结果，因为也希望修剪数据上的所有其他括号和引号。到目前为止，这是我的代码 ```

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

```

Answer 1

如果你可以使用程序和游标

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)

如何将mySQL中select列的结果拆分为多列

1 个答案: