您需要更加谨慎地进行字符串操作。您不能使用REPLACE()它，因为如果用逗号分隔的列表中的一个元素是另一元素的子字符串，它将替换多次出现的数据，从而破坏数据。该INSERT()字符串函数是为了这个美好的，不要与混淆INSERT用于插入到表的语句。
DELIMITER $$
DROP PROCEDURE IF EXISTS `insert_csv` $$
CREATE PROCEDURE `insert_csv`(_list MEDIUMTEXT)
BEGIN
DECLARE _next TEXT DEFAULT NULL;
DECLARE _nextlen INT DEFAULT NULL;
DECLARE _value TEXT DEFAULT NULL;
iterator:
LOOP
-- exit the loop if the list seems empty or was null;
-- this extra caution is necessary to avoid an endless loop in the proc.
IF LENGTH(TRIM(_list)) = 0 OR _list IS NULL THEN
LEAVE iterator;
END IF;
-- capture the next value from the list
SET _next = SUBSTRING_INDEX(_list,',',1);
-- save the length of the captured value; we will need to remove this
-- many characters + 1 from the beginning of the string
-- before the next iteration
SET _nextlen = LENGTH(_next);
-- trim the value of leading and trailing spaces, in case of sloppy CSV strings
SET _value = TRIM(_next);
-- insert the extracted value into the target table
INSERT INTO t1 (c1) VALUES (_value);
-- rewrite the original string using the `INSERT()` string function,
-- args are original string, start position, how many characters to remove,
-- and what to "insert" in their place (in this case, we "insert"
-- an empty string, which removes _nextlen + 1 characters)
SET _list = INSERT(_list,1,_nextlen + 1,'');
END LOOP;
END $$
DELIMITER ;
接下来，一个测试表：
CREATE TABLE `t1` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`c1` varchar(64) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
新表为空。
MysqL> SELECT * FROM t1;
Empty set (0.00 sec)
调用过程。
MysqL> CALL insert_csv('foo,bar,buzz,fizz');
Query OK, 1 row affected (0.00 sec)
请注意“受影响的第一行”并不意味着您所期望的。它指的是我们所做的最后一次插入。由于我们一次插入一行，因此，如果该过程 至少 插入一行，那么您将始终获得1的行计数。如果该过程不插入任何内容，则将影响0行。
奏效了吗？
MysqL> SELECT * FROM t1;
+----+------+
| id | c1 |
+----+------+
| 1 | foo |
| 2 | bar |
| 3 | buzz |
| 4 | fizz |
+----+------+
4 rows in set (0.00 sec)
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