How to block a select statement for a table of the specified until validation line
HelloHow to block a SELECT statement for a specified row in a table until willingness to engage occure?
My procedure is part of a Stock request and if a user (X) get stock 1 piece, another user must wait for the user (Y) complete his reportoire.
So, let say my stock have 10 pencils.
When the X user starts the Stock_PLS procedure, in table Stock, line (e.g. R1) that user X should work with it, must be lock up to what the commit / rollback will appear.
procedure Stock_PLS...
Start
..
pencils: pencils-1 =;
..
End
Observation-> pencils: = 9;
This means that is a user there, run SELECT * stock of the table where rows_id = R1, SELECTION should wait the Stock_PLS started by user X will be completed (with commit or rollback) and his SELECT should return the value 9.
What I need, is that Oracle has something like LINE EXCLUSIVE TABLE LOCK, but in my situation the SELECT statement should be denied on the specified lines, until the end of the procedure.
Kind regards
Michael
Hello
You can achieve this using the update with the Select clause.
You can write your select statement like this
SELECT * from stock of the table where rows_id = R1 for update;
Tags: Database
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