jsonb_each is a wrapper around each_worker_jsonb. It produces a row for every key/value pair in an object.
https://doxygen.postgresql.org/jsonfuncs_8c.html#a7511a3aa3918eb956f3f4211d07bdbb0 the iteration is: while ((r = JsonbIteratorNext(&it, &v, skipNested)) != WJB_DONE) On Tue, Mar 19, 2019 at 11:20 AM T L <tin...@gmail.com> wrote: > I need this in my C code on the server side. Any link to the `jsonb_each` > for this? Examples I found in a quick search are on the client side in SQL. > > I am just confused about the various jsonb types and how to effectively > extract values and convert between them: > > There are Jsonb, JsonbValue (plus the associated JsonbPair ) to begin > with. The ` JsonbToCStringWorker ` example that Andrew pointed out uses > still another "JsonbContainer" type. > But the type I get from "PG_GETARG_JSONB_P" is Jsonb. And it doesn't fit > into " JsonbContainer" or the pointer math about "JsonPair" that I found > online. > > What I am struggling with adapting some of the iterator code I saw is how > to delete irrelevant code without breaking it. My use case is very > restricted and handles hstore-like jsonb's. > I don't need or want the code to have the ability to descend into nested > objects or handle arrays etc., as they are invalid input in my case. > > I thought the pointer math example I found is easier to adapt, but I > couldn't get a valid "JsonbPair" from the input parameter to feed into the > pointer math. > > > > > > > On Tue, Mar 19, 2019 at 9:50 AM Michel Pelletier < > pelletier.mic...@gmail.com> wrote: > >> Yeah I'm not sure why you're looping using pointer math, the iterators >> are there to provide that service. Another function to check out >> 'jsonb_each', other than the set returning function parts, it does what it >> looks like your are trying to do. >> >> -Michel >> >> On Mon, Mar 18, 2019 at 4:12 PM Andrew Gierth < >> and...@tao11.riddles.org.uk> wrote: >> >>> >>>>> "T" == T L <tin...@gmail.com> writes: >>> >>> T> Below is my test. It prints a strange character instead of "a"; and >>> T> says that the value isn't numeric. >>> >>> Yeah, there's plenty else wrong with your code. >>> >>> Did you look at how JsonbToCStringWorker does it? that looks like the >>> best example I can find on a quick scan. >>> >>> -- >>> Andrew (irc:RhodiumToad) >>> >>>
