MySQL企业版里面的数据屏蔽的功能，在Percona 8.0.17里面被开源实现了。
我们这里演示方便起见，用dbdeployer来部署：
dbdeployer unpack --prefix=ps Percona-Server-8.0.18-9-Linux.x86_64.ssl101.tar.gz dbdeployer deploy single ps8.0.18 --bind-address='0.0.0.0' --gtid --init-general-log --enable-genera-log --disable-mysqlx --force
cd /sandboxes/msb_ps8_0_18/
cat my.sandbox.cnf 修改下 client段的user为root（默认dbdeployer部署的是低权限账号）
[client] user = root
# 安装data_masking 插件
./use 登录进mysql控制台
mysql [localhost:8018] {root} (test) > INSTALL PLUGIN data_masking SONAME 'data_masking.so';
Query OK, 0 rows affected (0.02 sec)# 演示数据屏障功能
mysql [localhost:8018] {root} (test) > SELECT mask_outer('This is a string', 5, 1); # 前5个和最后1个字符，用掩码替代
+--------------------------------------+
| mask_outer('This is a string', 5, 1) |
+--------------------------------------+
| XXXXXis a strinX |
+--------------------------------------+
1 row in set (0.00 sec)
mysql [localhost:8018] {root} (test) > SELECT mask_pan_relaxed(gen_rnd_pan());
+---------------------------------+
| mask_pan_relaxed(gen_rnd_pan()) |
+---------------------------------+
| 545151XXXXXX1753 |
+---------------------------------+
1 row in set (0.00 sec)
