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晚上有朋友问起，简单的写了一个。   DELIMITER $$ CREATE FUNCTION `t_girl` . `func_rand_string` ( f_num tinyint unsigned , f_type tinyint unsigned ) RETURNS varchar ( 32) BEGIN -- Translate the number to letter. -- No 1 stands for string only. -- No 2 stands for number only. -- No 3 stands for combination of the above. declare i int unsigned default 0; declare v_result varchar ( 255) default '' ; while i < f_num do if f_type = 1 then set v_result = concat ( v_result, char ( 97+ ceil( rand ( ) * 25) ) ) ; elseif f_type= 2 then set v_result = concat ( v_result, char ( 48+ ceil( rand ( ) * 9) ) ) ; elseif f_type= 3 then set v_result = concat ( v_result, substring ( replace ( uuid ( ) , '-' , '' ) , i+ 1, 1) ) ; end if; set i = i + 1; end while; return v_result; END $ $ DELIMITER ;     调用方法示例：   select func_rand_string(12,3);