12th September 2019: PostgreSQL 12 Beta 4 Released!
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4.3. pgtcl Command Reference Information

Table of Contents
pg_connect -- opens a connection to the backend server
pg_disconnect -- closes a connection to the backend server
pg_conndefaults -- obtain information about default connection parameters
pg_exec -- send a query string to the backend
pg_result -- get information about a query result
pg_select -- loop over the result of a SELECT statement
pg_listen -- sets or changes a callback for asynchronous NOTIFY messages
pg_lo_creat -- create a large object
pg_lo_open -- open a large object
pg_lo_close -- close a large object
pg_lo_read -- read a large object
pg_lo_write -- write a large object
pg_lo_lseek -- seek to a position in a large object
pg_lo_tell -- return the current seek position of a large object
pg_lo_unlink -- delete a large object
pg_lo_import -- import a large object from a Unix file
pg_lo_export -- export a large object to a Unix file