Im system based on C # language--database structure diagram (Communication framework for networkcomms2.3.1) "Coming Open source"

The database uses MSSQL 2005

There are four of tables

Offlinemessage offline messages stored in this table if the friend is not on the line when the message is sent

After waiting for a friend to go online, the server gets a message from this table, sends it to a friend, and deletes the sent offline message from the table.

Rcusers Table User Table store user Information Protection login ID password gender etc.

UserGroup Organization User group whether the user belongs to a sales group or a development group

RoleGroup Permissions User group store whether the user belongs to a manager or employee (not used in differential IM)

Im system based on C # language--database structure diagram (Communication framework for networkcomms2.3.1) "Coming Open source"