How do I write dump and read command at FMDB.

[exampapa]

I am trying to develop a dictionary application at Xcode, objective-C with FMDB.

FMDB is fabulous, so all SQL command like 'create', 'select' works fine.

But I do not know how do I write 'dump and read command' for table backup and restore at FMDB.

My DB has three tables, one is 'items" that has fixed dictionary data like word and mean.

Second table is 'status' that records word status like under studying, already studied and so on.

The last table is 'date log" that record date and status.

So, two tables, 'status' and 'date log' is variable tables, 

so I'd like to make backups in case I updated 'items' table.

Thanks in advance.