1:定义存储过程,用于分隔字符串
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DELIMITER $$
USE `mess`$$
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 $$
DELIMITER ;
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2:实现func_get_splitStringTotal函数:该函数用于计算分隔之后的长度,这里需要了解的函数:
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REPLACE (str,from_str,to_str)
Returns the string str with all occurrences of the string from_str replaced by the string to_str. REPLACE () performs a case -sensitive match when searching for from_str.
例如:
-> 'WwWwWw.mysql.com'
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具体实现:
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DELIMITER $$
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,f_delimiter, '' )));
END $$
DELIMITER ;
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3:实现func_splitString函数:用于获取分隔之后每次循环的值,这里需要了解的函数:
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(1)REVERSE(str)
Returns the string str with the order of the characters reversed.
例如:mysql> SELECT REVERSE( 'abc' );
-> 'cba'
(2)
SUBSTRING_INDEX(str,delim, count )
Returns the substring from string str before count occurrences of the delimiter delim. If count is positive, everything to the left of the final delimiter (counting from the left ) is returned. If count is negative, everything to the right of the final delimiter (counting from the right ) is returned. SUBSTRING_INDEX() performs a case -sensitive match when searching for delim.
例如:
mysql> SELECT SUBSTRING_INDEX( 'www.mysql.com' , '.' , 2);
-> 'www.mysql'
mysql> SELECT SUBSTRING_INDEX( 'www.mysql.com' , '.' , -2);
-> 'mysql.com'
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具体实现:
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DELIMITER $$
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_delimiter,f_order)),f_delimiter,1));
RETURN result;
END $$
DELIMITER ;
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使用:
(1)调用存储过程:
CALL splitString('1,3,5,7,9',',');
(2):查看临时表
SELECT val_ FROM tmp_split AS t1;
结果:
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原文链接:https://blog.csdn.net/xinglei200909931/article/details/84830809