On 2 May 2017 7:34 pm, "Michael Paquier" <michael.paqu...@gmail.com> wrote:
On Tue, May 2, 2017 at 6:12 PM, Mahi Gurram <teckym...@gmail.com> wrote: > I'm building some custom extension on top of postgres 9.6.1. As part of > that, I would like to read Heap Tuple directly from my extension using > Primary Key. > > By default, postgres table index(B-Tree) its PrimaryKey(PK). So, i would > like to get TID by doing a lookup into PK's B-Tree index. Using which i > could read HeapTuple directly. Use the heapam and indexam. There's a handy wrapper for simpler queries in genam. See systable_beginscsn etc. AFAIK these aren't really restricted to system tables. > > Please suggest me the easiest way to lookup into PK's B-Tree index for > getting TIDs. Why don't you just use SPI within your extension? No need to copy the logic for btree lookups this way. https://www.postgresql.org/docs/9.6/static/spi.html SPI is certainly the simplest way. > Suggesting a postgres extensions which does B-Tree lookup will also helps > me. Pglogical has lots of direct heap and index access via genam.
