mysql binary varbinary的运用
数据库设计中用到binary类型，会将sha1和permission code的值用binary类型表示（sha1 可以是char(40),但是作为索引效率不高）。
permission code是字节的每个位代表一个permission。
(e.g.: AppInfo & PermissionMap
Sha1 = 0A2976C272F81049B899B3C1EC0260A34477AD4B
permissionCode = 1330526069999549579810939684362649600
==1329227995784915872903807060280344576 | 1298074214633706907132624082305024
== (1 << 120) | (1 << 110)
(While, if you call our db interface to access database, you may just pass parameters as Sha1 = ‘0A2976C272F81049B899B3C1EC0260A34477AD4B’
permissionCode = 1330526069999549579810939684362649600
)
Sha1 = 53ED7D718E9053086D31FCD329BA56E58236F4A2):
mysql> describe AppInfo;
+----------------+----------------+------+-----+----------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------+----------------+------+-----+----------------------+-------+
| Sha1 | binary(20) | NO | PRI | | |
| PkgName | varchar(1024) | YES | | NULL | |
| PermissionCode | varbinary(256) | YES | | NULL | |
+----------------+----------------+------+-----+----------------------+-------+
mysql> describe PermissionMap;
+------------+----------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------+----------------+------+-----+---------+-------+
| id | varbinary(256) | NO | PRI | NULL | |
| Permission | varchar(64) | YES | | NULL | |
| Summary | varchar(512) | YES | | NULL | |
+------------+----------------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql>insert into AppInfo(Sha1,PkgName) values( 0x53ED7D718E9053086D31FCD329BA56E58236F4A2 ,"test");
Query OK, 1 row affected (0.00 sec)
mysql> insert into AppInfo(Sha1,PkgName,AppLabel) values( 0x0A2976C272F81049B899B3C1EC0260A34477AD4B ,'com.hotel',' 经济酒店 ');
Query OK, 1 row affected (0.00 sec);
mysql> update AppInfo set PermissionCode=0x1330526069999549579810939684362649600 where Sha1=0x0A2976C272F81049B899B3C1EC0260A34477AD4B;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from AppInfo where Sha1= 0x0A2976C272F81049B899B3C1EC0260A34477AD4B ;
+----------------------+-----------+------+--------------+-------------+-------------+------------+------+---------------+---------------+---------------+----------+---------------------+
| Sha1 | PkgName | PermissionCode |
+----------------------+-----------+------+--------------+-------------+-------------+------------+------+---------------+---------------+---------------+----------+---------------------+
|
)v ▒ r ▒ I ▒▒▒▒▒ ` ▒ Dw ▒ K | com.hotel | 3& ▒▒ T ▒ y ▒ 9hCbd ▒ |
+----------------------+-----------+------+--------------+-------------+-------------+------------+------+---------------+---------------+---------------+----------+---------------------+
1 row in set (0.00 sec)
mysql> insert into PermissionMap(id,Permission,Summary) values( 0x1298074214633706907132624082305024 ,"WRITE_SMS","Allows an application to write SMS messages.");
Query OK, 1 row affected (0.00 sec)
mysql> insert into PermissionMap(id,Permission,Summary) values( 0x1329227995784915872903807060280344576 ,"RECEIVE_SMS","Allows an application to monitor incoming SMS messages, to record or perform processing on them.");
Query OK, 1 row affected (0.00 sec)
mysql> select * from PermissionMap where id= 0x1298074214633706907132624082305024;
+-------------------+------------+----------------------------------------------+
| id | Permission | Summary |
+-------------------+------------+----------------------------------------------+
| ▒ Bc7 ▒ q2b@ ▒ 0P$ | WRITE_SMS | Allows an application to write SMS messages. |
+-------------------+------------+----------------------------------------------+
1 row in set (0.07 sec)