Re: getGeneratedKeys method
От | Sven Köhler |
---|---|
Тема | Re: getGeneratedKeys method |
Дата | |
Msg-id | 42177A2A.5000304@upb.de обсуждение исходный текст |
Ответ на | Re: getGeneratedKeys method (Dave Cramer <pg@fastcrypt.com>) |
Список | pgsql-jdbc |
> Yes, this is correct, there is no functionality in postgres to get the > generated keys. That's sad. > This is because the keys are generated using a sequence which can be any > of the columns in the row, there is no apriori knowledge of the column > that is being generated. First, we have to define what a "generated key" is! If you define it as a value generated by a sequence, than this is hard to find out. Simply take the following definition: A column in the primary key is a "generated key", iff a value for the columns hasn't been given in the INSERT and if the column has a default value. With this definition, is should be easy for the server to find the generated keys. > 2) get the key after the insert leaving the key value out of the insert, > or inserting a null there. select currval('sequence_name'); but you have to know the sequence name for that. That's really bad!
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