mySQL存储过程，用于通过定界符分割字符串 [英] mySQL Stored Procedure for splitting strings by delimiter

问题描述

我正在编写一个存储过程，该存储过程会爆炸一个传递的字符串 传递了定界符并返回结果的第n个元素. n通过 也是.

I'm into writing a stored procedure which explodes a passed string by a passed delimiter and returns the n-th element of the result. n is passed too.

这就是我想出的:

CREATE PROCEDURE SPLIT(IN strToSplit text, IN strDelimiter varchar(1), IN nPartToGet int,OUT strSlice varchar(255))
BEGIN

  SET strSlice = replace(substring(substring_index(strToSplit, strDelimiter, nPartToGet),
    length(substring_index(strToSplit,strDelimiter, nPartToGet - 1)) + 1), strDelimiter, '')

END
;

可悲的是，mysql一直在困扰我我那里有语法错误.恕我直言，这应该工作.有人可以戳我哪里出问题了吗?

Sadly mysql keeps naging me that I've got an syntax error in there. IMHO this should work. Could anyone pls poke me on where I'm going wrong?

预先感谢

  K

推荐答案

您需要在SET后面加上';'并且，在客户解释的情况下；作为定界符，您需要更改定界符，以便您可以输入实际值；进入程序.

You need to end your SET with a ';' and, given that the client interprets ; as the delimiter, you need to change the delimiter so you can enter an actual ; into the procedure.

mysql> delimiter //
mysql> CREATE PROCEDURE SPLIT(IN strToSplit text, IN strDelimiter varchar(1), IN nPartToGet int,OUT strSlice varchar(255))
    -> BEGIN
    -> SET strSlice = replace(substring(substring_index(strToSplit, strDelimiter,
    -> nPartToGet),     length(substring_index(strToSplit,strDelimiter, 
    -> nPartToGet - 1)) + 1), strDelimiter, '');
    -> END
    -> //
Query OK, 0 rows affected (0.01 sec)
mysql> delimiter ;
mysql> CALL SPLIT('1;2;3;4;5',';',3,@str);
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT @str;
+------+
| @str |
+------+
| 3    |
+------+
1 row in set (0.00 sec)

相关文档: http://dev.mysql. com/doc/refman/5.0/en/stored-routines.html

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