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X:\proper\mysql\bin>mysql -h localhost -u root -p
Enter password: **********
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 12 to server version: 5.0.22-community-nt-log
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> show variables like '%func%';
+-----------------------------------------+-------+
| Variable_name                            | Value |
+-----------------------------------------+-------+
| log_bin_trust_function_creators | ON    |
+-----------------------------------------+-------+
1 row in set (0.02 sec)
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mysql> set global log_bin_trust_function_creators=1;
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mysql> use xxx;
Database changed
delimiter $$ÊÇÉèÖà $$ΪÃüÁîÖÕÖ¹·ûºÅ£¬´úÌæ·ÖºÅ£¬ÒòΪ·ÖºÅÔÚbegin...endÖлáÓõ½£»
mysql> delimiter $$
mysql> create function test(t varchar(255))
    -> returns varchar(255)
    -> begin
    -> return left(t,1);
    -> end
    -> $$
Query OK, 0 rows affected (0.13 sec)
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mysql> delimiter ;
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mysql> select test('alpha');
+----------------+
| test('alpha') |
+---------------+
| a                 |
+---------------+
1 row in set (0.02 sec)
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mysql> drop function test;
Query OK, 0 rows affected (0.11 sec)