Thanks for your reply!
yeath,I quite accept your opinion,once i guess the drive adds savepoint
between the two SQL，but not sure
i want to get the last insert id to ensure the INSERT correctly ,so i called
currval().
as the error occurs seldom,i find it's difficult to trace the problem or the
logic is doing exactly
later i modified the code looks like:
>select nexval('t_wedding_wedding_id_seq') as Wedding_id;
>insert into t_wedding(wedding_id...) select Wedding_id...;
and in the later pressure tesing never saw the error again.
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God believes postgres is Good
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