I'm using PyGreSQL to access my DB. In the use-case I'm currently working on; I am trying to insert a record into a table and return the last rowid... aka the value that the DB created for my ID field:
create table job_runners (
id SERIAL PRIMARY KEY,
hostname varchar(100) not null,
is_available boolean default FALSE
);
sql = "insert into job_runners (hostname) values ('localhost')"
When I used the db.insert(), which made the most sense, I received an "AttributeError". And when I tried db.query(sql) I get nothing but an OID.
Q: Using PyGreSQL what is the best way to insert records and return the value of the ID field without doing any additional reads or queries?
The documentation in PyGreSQL says that if you call dbconn.query() with and insert/update statement that it will return the OID. It goes on to say something about lists of OIDs when there are multiple rows involved.
First of all; I found that the OID features did not work. I suppose knowing the version numbers of the libs and tools would have helped, however, I was not trying to return the OID.
Finally; by appending "returning id", as suggested by @hacker, pygresql simply did the right thing and returned a record-set with the ID in the resulting dictionary (see code below).
sql = "insert into job_runners (hostname) values ('localhost') returning id"
rv = dbconn.query(sql)
id = rv.dictresult()[0]['id']