Chapter 18. pgtcl

Table of Contents
pgtcl Command Reference Information

pgtcl is a tcl package for front-end programs to interface with Postgres backends. It makes most of the functionality of libpq available to tcl scripts.

This package was originally written by Jolly Chen.


Table 18-1. pgtcl Commands

pg_connectopens a connection to the backend server
pg_disconnectcloses a connection
pg_conndefaultsget connection options and their defaults
pg_execsend a query to the backend
pg_resultmanipulate the results of a query
pg_selectloop over the result of a SELECT statement
pg_listenestablish a callback for NOTIFY messages
pg_lo_creatcreate a large object
pg_lo_openopen a large object
pg_lo_closeclose a large object
pg_lo_readread a large object
pg_lo_writewrite a large object
pg_lo_lseekseek to a position in a large object
pg_lo_tellreturn the current seek position of a large object
pg_lo_unlinkdelete a large object
pg_lo_importimport a Unix file into a large object
pg_lo_exportexport a large object into a Unix file

These commands are described further on subsequent pages.

The pg_lo* routines are interfaces to the Large Object features of Postgres. The functions are designed to mimic the analogous file system functions in the standard Unix file system interface. The pg_lo* routines should be used within a BEGIN/END transaction block because the file descriptor returned by pg_lo_open is only valid for the current transaction. pg_lo_import and pg_lo_export MUST be used in a BEGIN/END transaction block.