用逗号运算符分隔MySQL字符串 [英] MySQL String separation by comma operator

问题描述

我有字符串asdasdwdfef,rgrgtggt,weef，我希望输出如下表所示的格式

I have String asdasdwdfef,rgrgtggt,weef and i want output like in table format as shown below

id      decription
1       asdasdwdfef
2       rgrgtggt
3       weef

为此，我创建了一个过程 这是我的程序

For this i created a procedure here is my procedure

DELIMITER ;;
CREATE Procedure Split(_RowData text, _Delimeter text)
BEGIN
    DECLARE _Iterator INT default 1;
    DECLARE _FoundIndex INT;
    DECLARE _Data varchar(255);
    SET _FoundIndex = LOCATE(_Delimeter,_RowData);
    DROP TABLE IF EXISTS _RtnValue;
    CREATE temporary TABLE _RtnValue(ID INT AUTO_INCREMENT NOT NULL, description text, primary key(ID));
    WHILE _FoundIndex > 1 DO
        INSERT INTO _RtnValue (description)
        SELECT
        _Data = LTRIM(RTRIM(SUBSTRING(_RowData, 1, _FoundIndex - 1)));
        set _RowData = SUBSTRING(_RowData, _FoundIndex + LENGTH(_Delimeter) / 2, LENGTH(_RowData));
        SET _Iterator = _Iterator + 1;
        SET _FoundIndex = LOCATE(_Delimeter, _RowData);
    END WHILE;
    INSERT INTO _RtnValue(description) SELECT _Data = LTRIM(RTRIM(_RowData));
    select * from _RtnValue;
END

但是当我通过使用以下命令执行它

But when i execute it by using following command

call Split('asdasdwdfef,rgrgtggt,weef', ',');

它给了我以下输出:

id      decription
1       NULL
2       NULL
3       NULL

请让我知道如何解决此问题. 我正在使用MySQL.

Please let me know how to fix this issue. I am using MySQL.

推荐答案

我得到了答案

首先创建新功能

CREATE FUNCTION SPLIT_STR(x VARCHAR(255), delim VARCHAR(12), pos INT)
RETURNS VARCHAR(255)
RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),
LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1), delim, '');

然后创建存储过程

DELIMITER ;;
CREATE PROCEDURE Split(in fullstr varchar(255))
BEGIN
    DECLARE a INT Default 0 ;
    DECLARE str VARCHAR(255);

    DROP TABLE IF EXISTS my_temp_table;
    CREATE temporary TABLE my_temp_table(ID INT AUTO_INCREMENT NOT NULL, description text, primary key(ID));

    simple_loop: LOOP
        SET a=a+1;
        SET str=SPLIT_STR(fullstr,",",a);
        IF str='' THEN
            LEAVE simple_loop;
        END IF;
        #Do Inserts into temp table here with str going into the row
        insert into my_temp_table (description) values (str);
   END LOOP simple_loop;
   select * from my_temp_table;
END

之后，当我通过call Split('asas,d,sddf,dfd');调用它时，它将为我提供所需的输出.

After that when i call it by call Split('asas,d,sddf,dfd'); it gives me the output that what i want.

感谢每一个建议.

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