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openfire中实现好友添加及分组管理。

主要基于两张table实现:ofroster,ofrostergroups。

ofroster：用于记录好友关系（一对好友关系用两条记录来实现）

ofrostergroups：用于记录好友分组

特别说明：openfire中用户的主键是自然主键，也就是username。没有使用自增ID。

我们先来看一下官方（http://www.igniterealtime.org/builds/openfire/docs/latest/documentation/database-guide.html）对 两张表的描述：

ofRoster (buddy rosters or lists)Column Name Type Length Description

rosterIDNUMBERn/aID of roster (Primary Key)usernameVARCHAR32User NamejidTEXTn/aThe address of the roster entrysubNUMBERn/aThe subscription status of the entryaskNUMBERn/aThe ask status of the entryrecvNUMBERn/aFlag indicating the entry is a roster request that was receivednickVARCHAR255The nickname assigned to this roster entry

ofRosterGroups (Groups of buddy entries in a roster)Column Name Type Length Description

rosterIDNUMBERn/aRoster ID (Primary Key)rankNUMBERn/aPosition of the entry (Primary Key)groupNameVARCHAR255The user defined name for this roster group

看不太明白？不要着急，我们慢慢分析。

假设有用户A,用户B。

当A申请加B为好友时（例如：A将B加入好亲人的分组中）。会在ofroster表中插入两条记录，

rosterID     username      jid                    sub     ask       recv      nick

1                    A                B@clover           0      0           -1           B
2                    B                A@clover           0     -1           1           null

同时往ofrostergroups表中插入一条记录

rosterID            rank                 groupName

1                         0                          Friends

这时B同意将A加为好友，并设置为Friends分组中，那么会修改ofroster表中刚插入的两条记录,如下所示:

rosterID    username          jid                  sub    ask   recv   nick

1                  A                B@clover             1      -1       1        B
2                  B                A@clover            2       0       -1        A

同时往ofrostergroups表中插入一条记录.

rosterID           rank             groupName

2                       0                         Friends

此时，ofrostergroups表中的记录是：

rosterID            rank                 groupName

1                         0                          Friends

2                       0                            Friends

到此为止，双方的好友关系便建立起来。

疑问：1.若B不同意呢？则不做任何操作。下一次，若B加A为好友，将等同于执行同意的操作。

2.如何查询某个人所有好友，和分组？

在ofroster中根据username便可获得某个用户的所有好友信息。然后根据每条记录的rosterid去ofrostergroups表中查找分组的名称即可。

3.当用户添加一个空的好友分组时，ofrostergroups表是否插入一条记录？

不插，测试发现并没有实质的插入一条记录，但用户可以看到这个分组名称，怎么回事？推测可能是存放在session中。

测试发现当用户创建一个空的好友分组，然后下线，再上线时，发现该好友分组已消失。充分说明当好友分组为空时，并没有插库。

Notice the different status types? Here is a list of all of the different status types, with a brief description, also from the plugin’s readme file.

askstatus

-1--  没有挂起的添加好友请求。

The roster item has no pending subscription requests.

0-- 有挂起的添加好友请求。

The roster item has been asked for permission to subscribe to its presence but no response has been received.

1-- 估计是有没有回复的删除请求吧

The roster owner has asked the roster item to be unsubscribed from its presence notifications but hasn’t yet received confi rmation.

recvstatus

-1-- 已经回复添加好友请求

There are no subscriptions that have been received but not presented to the user.

1-- 接收到好友请求但是没有给好友回复

The server has received a subscribe request, but has not forwarded it to the user.

2-- 估计是没有回复删除请求吧

The server has received an unsubscribe request, but has not forwarded it to the user.

substatus

-1--  应该删除这个好友

Indicates that the roster item should be removed.

0--  没有建立好友关系

No subscription is established.

1--  用户已经发出好友请求

The roster owner has a subscription to the roster item’s presence.

2--  收到好友请求并且加对方好友

The roster item has a subscription to the roster owner’s presence.

3--  好友已经相互添加

The roster item and the owner have a mutual subscription.