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Chapter 29. pgtcl - Tcl Binding Library

Table of Contents
29.1. Overview
29.2. Loading pgtcl into an Application
29.3. pgtcl Command Reference
pg_connect -- open a connection to the server
pg_disconnect -- close a connection to the server
pg_conndefaults -- get connection options and their defaults
pg_exec -- send a command to the server
pg_result -- get information about a command result
pg_select -- loop over the result of a query
pg_execute -- send a query and optionally loop over the results
pg_listen -- set or change a callback for asynchronous notification messages
pg_on_connection_loss -- set or change a callback for unexpected connection loss
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 from a large object
pg_lo_write -- write to a large object
pg_lo_lseek -- seek to a position of 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 file
pg_lo_export -- export a large object to a file
29.4. Example Program

pgtcl is a Tcl package for client programs to interface with PostgreSQL servers. It makes most of the functionality of libpq available to Tcl scripts.

29.1. Overview

Table 29-1 gives an overview over the commands available in pgtcl. These commands are described further on subsequent pages.

Table 29-1. pgtcl Commands

Command Description
pg_connect open a connection to the server
pg_disconnect close a connection to the server
pg_conndefaults get connection options and their defaults
pg_exec send a command to the server
pg_result get information about a command result
pg_select loop over the result of a query
pg_execute send a query and optionally loop over the results
pg_listen set or change a callback for asynchronous notification messages
pg_on_connection_loss set or change a callback for unexpected connection loss
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 from a large object
pg_lo_write write to 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 file
pg_lo_export export a large object to a file

The pg_lo_* commands are interfaces to the large object features of PostgreSQL. The functions are designed to mimic the analogous file system functions in the standard Unix file system interface. The pg_lo_* commands should be used within a BEGIN/COMMIT transaction block because the 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/COMMIT transaction block.

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