I have searched unsuccessfully for the answer to this so I hope that one of you may be able to help me.
I am using the new RETURNING functionality but can't make it work in a trigger.
In psql I can run a query like this: INSERT INTO foo(col1, col2, col3) VALUES (1, 2, 3) RETURNING col1; and I get col1 back from the insert.
Now, when I do that in a C trigger via SPI_exec the SPI_exec succeeds, but I can't figure out how to access the RETURNING part.
I have: if (SPI_exec("INSERT ....", 0) < 0) { // fail } else { Datum test = SPI_getbinval(SPI_tuptable->vals[0], SPI_tuptable->tupdesc, 1, &isnull); }
I have used similar code to get values from SELECT without problems. I assumed that an INSERT RETURNING would place the returned value into the global SPI_tuptable, but it seems that this isn't the case? If, right after the SPI_exec, I check SPI_tuptable it is indeed NULL.
I guess my question is then: In a trigger using SPI_exec, how does one get the RETURNING part of the query?