服务器：

C:\Appserv\mysql\bin\mysql.exe  Ver 14.7 Distrib 4.1.7, for Win95/Win98 (i32)
    
    Connection id:          296 
    Current database: 
    Current user:           ODBC@localhost 
    SSL:                    Not in use 
    Using delimiter:     ; 
    Server version:         4.1.7-log 
    Protocol version:       10 
    Connection:             localhost via TCP/IP 
    Server characterset:    latin1 
    Db     characterset:    latin1 
    Client characterset:    latin1 
    Conn.  characterset:    latin1 
    TCP port:               3306

查询功能：

CREATE FUNCTION IF NOT EXISTS isNumeric (input VARCHAR(255))
    RETURNS INT  DETERMINISTIC  RETURN input REGEXP '^[0-9]+\\\\.?[0-9]*$';

错误日志：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IF NOT EXISTS isNumeric (input VARCHAR(255))