mysql>
mysql> delimiter $$
mysql>
mysql>
mysql> CREATE FUNCTION shorten(s VARCHAR(255), n INT)
-> RETURNS VARCHAR(255)
-> BEGIN
-> IF ISNULL(s) THEN
-> RETURN '';
-> ELSEIF n<15 THEN
-> RETURN LEFT(s, n);
-> ELSE IF CHAR_LENGTH(s) <= n THEN
-> RETURN s;
-> ELSE
-> RETURN CONCAT(LEFT(s, n-10), ' ... ', RIGHT(s, 5));
-> END IF;
-> END IF;
-> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> SELECT shorten("abcdefghijklmnopqrstuvwxyz", 15)$$
+-------------------------------------------+
| shorten("abcdefghijklmnopqrstuvwxyz", 15) |
+-------------------------------------------+
| abcde ... vwxyz |
+-------------------------------------------+
1 row in set (0.00 sec)
mysql>
mysql> delimiter ;
mysql>
mysql> CREATE TABLE titles (
-> titleID int(11),
-> title varchar(100),
-> subtitle varchar(100),
-> edition tinyint(4),
-> publID int(11),
-> catID int(11),
-> langID int(11),
-> year int(11),
-> isbn varchar(20),
-> comment varchar(255),
-> ts timestamp,
-> authors varchar(255),
-> PRIMARY KEY (titleID)
-> );
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
mysql>
mysql> INSERT INTO titles VALUES (1,'Linux','Installation',5,1,57,2,2000,NULL,NULL,'2005-02-28 13:34:21','Michael'),
-> (2,'Excel',NULL,NULL,2,3,NULL,2000,NULL,NULL,'2005-02-28 13:34:22','David'),
-> (3,'XML',NULL,NULL,1,2,NULL,1997,NULL,NULL,'2005-02-28 13:34:22','Edwards'),
-> (4,'PHP',NULL,NULL,3,6,NULL,2000,NULL,NULL,'2005-02-28 13:34:22','Tom'),
-> (5,'MySQL','',0,3,34,NULL,2000,'','','2005-02-28 13:34:22','Paul'),
-> (6,'Java',NULL,NULL,4,34,NULL,1999,NULL,NULL,'2005-02-28 13:34:22','Tim');
Query OK, 6 rows affected (0.00 sec)
Records: 6 Duplicates: 0 Warnings: 0
mysql>
mysql>
mysql>
mysql>
mysql> SELECT title, shorten(title, 2) FROM titles LIMIT 10;
+-------+-------------------+
| title | shorten(title, 2) |
+-------+-------------------+
| Linux | Li |
| Excel | Ex |
| XML | XM |
| PHP | PH |
| MySQL | My |
| Java | Ja |
+-------+-------------------+
6 rows in set (0.00 sec)
mysql>
mysql>
mysql> drop table titles;
Query OK, 0 rows affected (0.00 sec)
mysql> drop function shorten;
Query OK, 0 rows affected (0.00 sec)
mysql>
|