Table locking in MS SQL Server

Hi
Can anyone help with a locking problem I have. I have a jsp accessing an MS SQL 7 table. The data access has exception handling and the connection and resultset are closed within the finally block, however the table accessed sometimes gets locked preventing any updates to the records. I am using web logics jdbc driver.
Any help would be appreciated.
Dave

A quite wide issue.
Firstly, if you don't do locks, you may experince the locks other connections (by other programs) have caused.
If you do your connection with setTarnsactionIsolation( Connection.READ_UNCOMMITTED ), then you should not be influenced by other's locks. But this level is not to be recommended.
The default is Connection.READ_COMMITTED. In this level - and the higher levels as well - you are prevented from even reading a value which another connection has written, but not yet committed.
Much more locking influences, if you want to do an update.
Now, from the transaction logic only that row that is touched would have to be locked. But SQLServer has a kind of "self-deciding" locking behaviour. It starts with row locks, but if certain internal DBMS resources come low, it switches to using page locks and finally even table locks.
MS claims this as an advantage, my impression. If it is, decide on your own.
This is all described quite largely in the SQLServer docs.
We had some large discussions on this here, too. Search for "+lock +sqlserver" to find them.

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