Karsten Hilbert wrote:
// check if entry already exists
SELECT COUNT(*) FROM tablename WHERE [cond]
You may want to try this instead:
select exists(select * from tablename where [cond])
which should be faster than count(*). You'll get back a
boolean value, though, not an integer.
Karsten
Why not do:
SELECT 1 FROM tablename WHERE [cond];
And use row_count > 0 to determine a hit.
And I can't think of a way to prevent the race-condition thing besides using SERIALIZABLE ISOLATION.
