How to lock a table in a report program

Question

Hi all,
     I have a requirement inwhich if i have selected one radio button  the table should locked .
   and the i need to check wether the table is locked or not by checking the condition.if locked continue else i need to stop.
can any one help me doing this.

Answer 1

Hi,
Hope this information will be useful for you.....
The description of an SAP lock to a table is made via the lock condition and the lock mode.
The lock condition is a logical condition for the lines of the table to be locked. It describes the area of the table which the lock is to protect from competitive access. To avoid the administration of the lock becoming complicated, the lock condition can not be formulated as freely as the WHERE clauses:  only fully qualified key fields related by AND may appear in the condition.
Via the lock mode you define which operations on the table are to be protected by the lock. The lock modes available are:
Read lock (shared lock)
protects read access to an object. The read lock allows other transactions read access but not write access to the locked area of the table.
Write lock (exclusive lock)
protects write access to an object. The write lock allows other transactions neither read nor write access to the locked area of the table.
Enhanced write lock (exclusive lock without cumulation)
works like a write lock except that the enhanced write lock also protects from further accesses from the same transaction.
In order to be able to define SAP locks for a table, you must first create a lock object for the table via Development->Dictionary.
If the data for an application object is distributed among several database tables, it is often necessary to be able to lock these tables simultaneously. It is therefore possible to include several tables in a lock object, althought they must be related via appropriate foreign key relationships. The tables involved in a lock object are also known as its base tables.
Thanks
NITESH