Description of Fields Commonly Used

These fields may appear in different types of data. They represent the same meaning unless specified.

Key Type meaning
SID Int64 School ID
CourseID Int64 Course ID
ClassID Int64 Class ID
Cmd Int32或String Message type
CloseTime Int64 Closing time for class
StartTime Int64 Class start time
_id String The message identifier
TimeStamp Int64 School certification time stamp
SafeKey String School certification security key md5(SECRET + TimeStamp)

Other common fields

Key Type meaning
ActionTime Int64 Action time stamp
SourceUID Int64 The originator ID,0 expression
TargetUID Int64 The target user ID,0 There is no target, the actual target is all the users in the classroom.

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