1：定義儲存過程，用於分隔字串

DELIMITER $$
USE `mess`$$
DROP PROCEDURE IF EXISTS `splitString`$$
CREATE DEFINER=`root`@`%` PROCEDURE `splitString`(IN f_string VARCHAR(1000),IN f_delimiter VARCHAR(5))
BEGIN  
  DECLARE cnt INT DEFAULT 0;  
  DECLARE i INT DEFAULT 0;  
  SET cnt = func_get_splitStringTotal(f_string,f_delimiter);  
  DROP TABLE IF EXISTS `tmp_split`;  
  CREATE TEMPORARY TABLE `tmp_split` (`val_` VARCHAR(128) NOT NULL) DEFAULT CHARSET=utf8;  
  WHILE i < cnt  
  DO  
    SET i = i + 1;  
    INSERT INTO tmp_split(`val_`) VALUES (func_splitString(f_string,f_delimiter,i));  
  END WHILE;  
END$$
DELIMITER ;

2：實現func_get_splitStringTotal函式：該函式用於計算分隔之後的長度，這裡需要了解的函式：

REPLACE(str,from_str,to_str)

Returns the string str with all occurrences of the string from_str replaced by the string to_str. REPLACE() performs a case-sensitive match when searching for from_str.
例如：
mysql> SELECT REPLACE('www.mysql.com','w','Ww');
    -> 'WwWwWw.mysql.com'

具體實現：

DELIMITER $$

USE `mess`$$

DROP FUNCTION IF EXISTS `func_get_splitStringTotal`$$

CREATE DEFINER=`root`@`%` FUNCTION `func_get_splitStringTotal`(  
f_string VARCHAR(10000),f_delimiter VARCHAR(50)  
) RETURNS INT(11)
BEGIN  
 RETURN 1+(LENGTH(f_string) - LENGTH(REPLACE(f_string,'')));  
END$$

DELIMITER ;

3：實現func_splitString函式：用於獲取分隔之後每次迴圈的值，這裡需要了解的函式：

（1）REVERSE(str)

Returns the string str with the order of the characters reversed.
例如：mysql> SELECT REVERSE('abc');
    -> 'cba'

（2）
SUBSTRING_INDEX(str,delim,count)


Returns the substring from string str before count occurrences of the delimiter delim. If count is positive,everything to the left of the final delimiter (counting from the left) is returned. If count is negative,everything to the right of the final delimiter (counting from the right) is returned. SUBSTRING_INDEX() performs a case-sensitive match when searching for delim.

例如：
mysql> SELECT SUBSTRING_INDEX('www.mysql.com','.',2);
    -> 'www.mysql'
mysql> SELECT SUBSTRING_INDEX('www.mysql.com',-2);
    -> 'mysql.com'

具體實現：

DELIMITER $$

USE `mess`$$

DROP FUNCTION IF EXISTS `func_splitString`$$

CREATE DEFINER=`root`@`%` FUNCTION `func_splitString`( f_string VARCHAR(1000),f_delimiter VARCHAR(5),f_order INT) RETURNS VARCHAR(255) CHARSET utf8
BEGIN  
  DECLARE result VARCHAR(255) DEFAULT '';  
  SET result = REVERSE(SUBSTRING_INDEX(REVERSE(SUBSTRING_INDEX(f_string,f_order)),1));  
  RETURN result;  
END$$

DELIMITER ;

使用：

（1）呼叫儲存過程：

CALL splitString('1,3,5,7,9',',');

（2）：檢視臨時表

SELECT val_ FROM tmp_split AS t1;

結果：

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