| PostgreSQL 7.4.3 Documentation | ||||
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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.
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.