MySQL中实现分割字符串的方法

比如现在有一字符串：1,2,44,5,666,29232
要把它按照逗号分割成：
1
2
44
5
666
29232
而且还要求它的总数。这个我以前写过。不过今天规范一下。

1、具体函数

SQL code

    
    
    
    

     
     
     
     
     
DELIMITER $$


     
     
     
     CREATE
     
     
     
      DEFINER
     
     
     
     =
     
     
     
     `root`@`
     
     
     
     %
     
     
     
     ` 
     
     
     
     FUNCTION
     
     
     
      `func_get_split_string_total`(
f_string 
     
     
     
     varchar
     
     
     
     (
     
     
     
     1000
     
     
     
     ),f_delimiter 
     
     
     
     varchar
     
     
     
     (
     
     
     
     5
     
     
     
     )
) 
     
     
     
     RETURNS
     
     
     
      
     
     
     
     int
     
     
     
     (
     
     
     
     11
     
     
     
     )

     
     
     
     BEGIN
    
    
    
    

    
    
    
    

     
     
     
     
     
     
     
      -- Get the total number of given string.
 
     
     
     
     return
     
     
     
      
     
     
     
     1
     
     
     
     +
     
     
     
     (length(f_string) 
     
     
     
     -
     
     
     
      length(
     
     
     
     replace
     
     
     
     (f_string,f_delimiter,
     
     
     
     ''
     
     
     
     )));

     
     
     
     END
     
     
     
     $$

DELIMITER ;

    
    
    
    

SQL code

    
    
    
    

     
     
     
     
     
DELIMITER $$



     
     
     
     CREATE
     
     
     
      DEFINER
     
     
     
     =
     
     
     
     `root`@`
     
     
     
     %
     
     
     
     ` 
     
     
     
     FUNCTION
     
     
     
      `func_get_split_string`(
f_string 
     
     
     
     varchar
     
     
     
     (
     
     
     
     1000
     
     
     
     ),f_delimiter 
     
     
     
     varchar
     
     
     
     (
     
     
     
     5
     
     
     
     ),f_order 
     
     
     
     int
     
     
     
     ) 
     
     
     
     RETURNS
     
     
     
      
     
     
     
     varchar
     
     
     
     (
     
     
     
     255
     
     
     
     ) CHARSET utf8

     
     
     
     BEGIN
    
    
    
    

    
    
    
    

     
     
     
     
     
     
     
      -- Get the separated number of given string.
 
     
     
     
     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 ;
    
    
    
    

测试的存储过程：

DELIMITER $$

CREATE PROCEDURE `sp_print_result`(
 IN f_string varchar(1000),IN f_delimiter varchar(5)
)
BEGIN
  -- Get the separated string.
  declare cnt int default 0;
  declare i int default 0;
  set cnt = func_get_split_string_total(f_string,f_delimiter);
  drop table if exists tmp_print;
  create temporary table tmp_print (num int not null);
  while i < cnt
  do
    set i = i + 1;
    insert into tmp_print(num) values (func_get_split_string(f_string,f_delimiter,i));
  end while;
  select * from tmp_print;
  
END$$

DELIMITER ;

2、来做一下测试
   mysql> call sp_print_result('1,2,44,5,666,29232',',');
+-------+
| num   |
+-------+
|     1 |
|     2 |
|    44 |
|     5 |
|   666 |
| 29232 |
+-------+
6 rows in set (0.01 sec)

Query OK, 0 rows affected (0.01 sec)