create table "LockTable" ( LockID integer primary key, LockTable varchar(255) NOT NULL, LockTime datetime NULL);
insert into "LockTable" values (0, '', NULL);
insert into "LockTable" values (1, 'MyTable', NULL);

##</code><code>##

begin transaction;
update "LockTable" set LockTime=CURRENT_TIMESTAMP where LockTable = 'MyTable';
insert into "MyTable" values (a, b, c, etc.);
update "LockTable" set LockTime=NULL where LockTable = 'MyTable';
commit transaction;