<Chapter>
<Title>pgtcl</Title>

<Para>
pgtcl is a tcl package for front-end programs to interface with <ProductName>Postgres</ProductName>
backends.    pgtcl does not use the libpq library but communicates to
the backend directly via the frontend-backend protocol.  Thus, it is
more efficient than previous postgres->tcl bindings which are layered
on top of libpq.  In addition, pgtcl can handle multiple backend
connections from a single frontend application.
</Para>

<Para>
This package was originally written by Jolly Chen.
</Para>

<Sect1>
<Title>Commands</Title>

<Para>
The pg_lo* routines are interfaces to the Inversion Large Objects in <ProductName>Postgres</ProductName>.
The functions are designed to mimic the analogous file system functions in
the standard Unix file system interface.
</Para>

<Para>
<TABLE TOCENTRY="1">
<TITLE>PGTCL Commands</TITLE>
<TGROUP COLS="2">
<THEAD>
  <ROW>
    <ENTRY>Command</ENTRY>
    <ENTRY>Description</ENTRY>
  </ROW>
</THEAD>
<TBODY>
  <ROW>
    <ENTRY>pg_connect</ENTRY>
    <ENTRY>opens a connection to the backend server</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_disconnect</ENTRY>
    <ENTRY>closes a connection</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_exec</ENTRY>
    <ENTRY>send a query to the backend</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_select</ENTRY>
    <ENTRY>loop over the result of a select statement</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_result</ENTRY>
    <ENTRY>manipulate the results of a query</ENTRY>
  </ROW>

  <ROW>
    <ENTRY>pg_lo_creat</ENTRY>
    <ENTRY>create a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_open</ENTRY>
    <ENTRY>open a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_close</ENTRY>
    <ENTRY>close a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_read</ENTRY>
    <ENTRY>read a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_write</ENTRY>
    <ENTRY>write a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_lseek</ENTRY>
    <ENTRY>seek to a position on a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_tell</ENTRY>
    <ENTRY>return the current seek position of a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_unlink</ENTRY>
    <ENTRY>delete a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_import</ENTRY>
    <ENTRY>import a Unix file into a large object</ENTRY>
  </ROW>
  <ROW>
    <ENTRY>pg_lo_export</ENTRY>
    <ENTRY>export a large object into a Unix file</ENTRY>
  </ROW>
</TBODY>
</TGROUP>
</TABLE>
</Para>

<Para>
Some commands equivalent to libpq commands are provided for connection
and query operations.
</Para>

<Para>
The pg_lo* routines should typically 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.
</Para>

</Sect1>

<Sect1>
<Title>Examples</Title>

<Para>
Here's a small example of how to use the routines:

<ProgramListing>
# getDBs :
#   get the names of all the databases at a given host and port number
#   with the defaults being the localhost and port 5432
#   return them in alphabetical order
proc getDBs { {host "localhost"} {port "5432"} } {
    # datnames is the list to be result
    set conn [pg_connect template1 -host $host -port $port]
    set res [pg_exec $conn "SELECT datname FROM pg_database ORDER BY datname"]
    set ntups [pg_result $res -numTuples]
    for {set i 0} {$i < $ntups} {incr i} {
	lappend datnames [pg_result $res -getTuple $i]
    }
    pg_disconnect $conn
    return $datnames
}
</ProgramListing>

</Para>
</Sect1>

<Sect1>
<Title>Reference Information</Title>

<REFENTRY ID="PGTCL-PGCONNECT-1">
<REFMETA>
<REFENTRYTITLE>pg_connect</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Connection Management</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_connect
</REFNAME>
<REFPURPOSE>opens a connection to the backend server
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGCONNECT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>connecting</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGCONNECT-2"><PRIMARY>pg_connect</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_connect <REPLACEABLE CLASS="PARAMETER">dbName</REPLACEABLE> <OPTIONAL>-host <REPLACEABLE CLASS="PARAMETER">hostName</REPLACEABLE></OPTIONAL>
  <OPTIONAL>-port <REPLACEABLE CLASS="PARAMETER">portNumber</REPLACEABLE></OPTIONAL> <OPTIONAL>-tty <REPLACEABLE CLASS="PARAMETER">pqtty</REPLACEABLE></OPTIONAL> <OPTIONAL>-options <REPLACEABLE CLASS="PARAMETER">optionalBackendArgs</REPLACEABLE></OPTIONAL>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGCONNECT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">dbName</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database name.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <OPTIONAL>-host <REPLACEABLE CLASS="PARAMETER">hostName</REPLACEABLE></OPTIONAL>
</TERM>
<LISTITEM>
<PARA>Specifies the domain name of the backend server for <REPLACEABLE CLASS="PARAMETER">dbName</REPLACEABLE>.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <OPTIONAL>-port <REPLACEABLE CLASS="PARAMETER">portNumber</REPLACEABLE></OPTIONAL>
</TERM>
<LISTITEM>
<PARA>Specifies the IP port number of the backend server for <REPLACEABLE CLASS="PARAMETER">dbName</REPLACEABLE>.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <OPTIONAL>-tty <REPLACEABLE CLASS="PARAMETER">pqtty</REPLACEABLE></OPTIONAL>
</TERM>
<LISTITEM>
<PARA>(need information thomas 1997-12-24)
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <OPTIONAL>-options <REPLACEABLE CLASS="PARAMETER">optionalBackendArgs</REPLACEABLE></OPTIONAL>
</TERM>
<LISTITEM>
<PARA>Specifies options for the backend server for <REPLACEABLE CLASS="PARAMETER">dbName</REPLACEABLE>.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGCONNECT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">dbHandle</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
The return result is either an error message or a handle for a database
   connection.  Handles start with the prefix "pgp"
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>
</REFSYNOPSISDIV>

<!-- ********************************************************** -->

<REFSECT1 ID="R1-PGTCL-PGCONNECT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_connect</FUNCTION> opens a connection to the <ProductName>Postgres</ProductName> backend.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGCONNECT-2">
<TITLE>Usage
</TITLE>
<PARA>XXX thomas 1997-12-24
</PARA>
</REFSECT1>
</REFENTRY>

<REFENTRY ID="PGTCL-PGDISCONNECT-1">
<REFMETA>
<REFENTRYTITLE>pg_disconnect</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Connection Management</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_disconnect
</REFNAME>
<REFPURPOSE>closes a connection to the backend server
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGDISCONNECT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>connecting</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGDISCONNECT-2"><PRIMARY>pg_connect</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_disconnect <REPLACEABLE CLASS="PARAMETER">dbHandle</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGDISCONNECT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">dbHandle</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database handle.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGDISCONNECT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  None
</TERM>
<LISTITEM>
<PARA>
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGDISCONNECT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_disconnect</FUNCTION> closes a connection to the <ProductName>Postgres</ProductName> backend.
</PARA>
</REFSECT1>

</REFENTRY>

<REFENTRY ID="PGTCL-PGEXEC-1">
<REFMETA>
<REFENTRYTITLE>pg_exec</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Connection Management</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_exec
</REFNAME>
<REFPURPOSE>
send a query string to the backend 
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGEXEC-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>connecting</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGEXEC-2"><PRIMARY>pg_connect</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_exec <REPLACEABLE CLASS="PARAMETER">dbHandle</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">queryString</REPLACEABLE>
</SYNOPSIS>

<!-- ********************************************************** -->

<REFSECT2 ID="R2-PGTCL-PGEXEC-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">dbHandle</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database handle.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">queryString</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid SQL query.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGEXEC-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">queryHandle</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
   the return result is either an error message or a handle for a query result.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2></REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGEXEC-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA>
<FUNCTION>pg_exec</FUNCTION> submits a query to the <ProductName>Postgres</ProductName> backend and returns a result.
  Handles start with the prefix "pgp".
</PARA>
</REFSECT1>

</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGSELECT-1">
<REFMETA>
<REFENTRYTITLE>pg_select</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Connection Management</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_select
</REFNAME>
<REFPURPOSE>
loop over the result of a select statement
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGSELECT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>connecting</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGSELECT-2"><PRIMARY>pg_connect</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_select <REPLACEABLE CLASS="PARAMETER">dbHandle</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">queryString</REPLACEABLE>
  <REPLACEABLE CLASS="PARAMETER">arrayVar</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">queryProcedure</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGSELECT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">dbHandle</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database handle.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">queryString</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid SQL select query.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">arrayVar</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Array variable for tuples returned.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">queryProcedure</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Procedure run on each tuple found.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>

</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGSELECT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">queryHandle</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
   the return result is either an error message or a handle for a query result.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2></REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGSELECT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA>
<FUNCTION>pg_select</FUNCTION> submits a query to the <ProductName>Postgres</ProductName> backend.
 and returns the results.
  The <REPLACEABLE CLASS="PARAMETER">queryString</REPLACEABLE>
   must be a select statement.  Anything else returns an error.
  The <REPLACEABLE CLASS="PARAMETER">arrayVar</REPLACEABLE>
   variable is an array name used in the loop.  It is filled
   out with the result of the query for each tuple using the field
   names as the associative indices.
</PARA>
</REFSECT1>

<REFSECT1 ID="R1-PGTCL-PGSELECT-2">
<TITLE>Usage
</TITLE>
<PARA>
<ProgramListing>
	set DB "mydb"
	set conn [pg_connect $DB]
	pg_select $conn "SELECT * from table" array {
		puts [format "%5d %s" array(control) array(name)]
	}
	pg_disconnect $conn
</ProgramListing>
</PARA>
</REFSECT1>

</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGRESULT-1">
<REFMETA>
<REFENTRYTITLE>pg_result</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Connection Management</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_result
</REFNAME>
<REFPURPOSE>
get information about a query result
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGRESULT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>connecting</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGRESULT-2"><PRIMARY>pg_connect</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_result <REPLACEABLE CLASS="PARAMETER">queryHandle</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">resultOption</REPLACEABLE>
</SYNOPSIS>
<REFSECT2 ID="R2-PGTCL-PGRESULT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">queryHandle</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
  The handle for a query result.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">resultOption</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Specifies one of several possible options.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>

<REFSECT3>
<TITLE>Options</TITLE>

<VARIABLELIST>
<VARLISTENTRY>
<TERM>
-status  
</TERM>
<LISTITEM>
<PARA>
the status of the result.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
-oid
</TERM>
<LISTITEM>
<PARA>
if the last query was an insert, returns the oid of the 
inserted tuple
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
-conn
</TERM>
<LISTITEM>
<PARA>
the connection that produced the result
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
-assign arrayName
</TERM>
<LISTITEM>
<PARA>
assign the results to an array
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
-numTuples
</TERM>
<LISTITEM>
<PARA>
the number of tuples in the query
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
-attributes
</TERM>
<LISTITEM>
<PARA>
returns a list of the name/type pairs of the tuple attributes
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
-getTuple tupleNumber
</TERM>
<LISTITEM>
<PARA>
returns the values of the tuple in a list
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
-clear 
</TERM>
<LISTITEM>
<PARA>
clear the result buffer. Do not reuse after this
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT3>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGRESULT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">queryHandle</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
   the return result is either an error message or a handle for a query result.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2></REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGRESULT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA>
<FUNCTION>pg_result</FUNCTION> returns information about a query.
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOCREAT-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_creat</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_creat
</REFNAME>
<REFPURPOSE>create a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOCREAT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>creating</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOCREAT-2"><PRIMARY>pg_lo_creat</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_creat <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">mode</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOCREAT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">mode</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies the access mode for the large object</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOCREAT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">objOid</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
The oid of the large object created.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOCREAT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_creat</FUNCTION> creates an Inversion Large Object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOCREAT-2">
<TITLE>Usage
</TITLE>
<PARA>
mode can be any OR'ing together of INV_READ, INV_WRITE, and INV_ARCHIVE. 
The OR delimiter character is "|".
<ProgramListing>
[pg_lo_creat $conn "INV_READ|INV_WRITE"]
</ProgramListing>
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOOPEN-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_open</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_open
</REFNAME>
<REFPURPOSE>open a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOOPEN-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>opening</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOOPEN-2"><PRIMARY>pg_lo_open</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_open <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">objOid</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">mode</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOOPEN-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">objOid</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid large object oid.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">mode</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies the access mode for the large object</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOOPEN-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
A file descriptor for use in later pg_lo* routines.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOOPEN-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_open</FUNCTION> open an Inversion Large Object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOOPEN-2">
<TITLE>Usage
</TITLE>
<PARA>
Mode can be either "r", "w", or "rw".
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOCLOSE-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_close</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_close
</REFNAME>
<REFPURPOSE>close a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOCLOSE-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>closing</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOCLOSE-2"><PRIMARY>pg_lo_close</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_close <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOCLOSE-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
A file descriptor for use in later pg_lo* routines.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOCLOSE-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>None</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOCLOSE-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_close</FUNCTION> closes an Inversion Large Object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOCLOSE-2">
<TITLE>Usage
</TITLE>
<PARA>
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOREAD-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_read</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_read
</REFNAME>
<REFPURPOSE>read a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOREAD-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>reading</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOREAD-2"><PRIMARY>pg_lo_read</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_read <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">bufVar</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOREAD-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
File descriptor for the large object from pg_lo_open.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">bufVar</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid buffer variable to contain the large object segment.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies the maximum allowable size of the large object segment.</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOREAD-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>None</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOREAD-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_read</FUNCTION> reads 
at most <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE> bytes from a large object into a variable
 named <REPLACEABLE CLASS="PARAMETER">bufVar</REPLACEABLE>.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOREAD-2">
<TITLE>Usage
</TITLE>
<PARA>
<REPLACEABLE CLASS="PARAMETER">bufVar</REPLACEABLE> must be a valid variable name.
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOWRITE-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_write</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_write
</REFNAME>
<REFPURPOSE>write a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOWRITE-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>writing</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOWRITE-2"><PRIMARY>pg_lo_write</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_write <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">buf</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOWRITE-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
File descriptor for the large object from pg_lo_open.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">buf</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid string variable to write to the large object.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies the maximum size of the string to write.</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOWRITE-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>None</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOWRITE-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_write</FUNCTION> writes 
at most <REPLACEABLE CLASS="PARAMETER">len</REPLACEABLE> bytes to a large object from a variable
 <REPLACEABLE CLASS="PARAMETER">buf</REPLACEABLE>.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOWRITE-2">
<TITLE>Usage
</TITLE>
<PARA>
<REPLACEABLE CLASS="PARAMETER">buf</REPLACEABLE> must be 
the actual string to write, not a variable name.
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOLSEEK-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_lseek</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_lseek
</REFNAME>
<REFPURPOSE>seek to a position on a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOLSEEK-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>positioning</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOLSEEK-2"><PRIMARY>pg_lo_lseek</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_lseek <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">whence</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOLSEEK-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
File descriptor for the large object from pg_lo_open.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a zero-based offset in bytes.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">whence</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA> whence can be "SEEK_CUR", "SEEK_END", or "SEEK_SET" </PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOLSEEK-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>None</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOLSEEK-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_lseek</FUNCTION> positions 
to <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE> bytes from the beginning of the large object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOLSEEK-2">
<TITLE>Usage
</TITLE>
<PARA>
<REPLACEABLE CLASS="PARAMETER">whence</REPLACEABLE> 
can be "SEEK_CUR", "SEEK_END", or "SEEK_SET".
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOTELL-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_tell</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_tell
</REFNAME>
<REFPURPOSE>return the current seek position of a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOTELL-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>positioning</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOTELL-2"><PRIMARY>pg_lo_tell</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_tell <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOTELL-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">fd</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
File descriptor for the large object from pg_lo_open.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOTELL-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>A zero-based offset in bytes suitable for input to <Function>pg_lo_lseek</Function>.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOTELL-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_tell</FUNCTION> returns the current
to <REPLACEABLE CLASS="PARAMETER">offset</REPLACEABLE> in bytes from the beginning of the large object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOTELL-2">
<TITLE>Usage
</TITLE>
<PARA>
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOUNLINK-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_unlink</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_unlink
</REFNAME>
<REFPURPOSE>delete a large object
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOUNLINK-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>delete</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOUNLINK-2"><PRIMARY>pg_lo_unlink</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_unlink <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">lobjId</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOUNLINK-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">lobjId</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Identifier for a large object.
XXX Is this the same as objOid in other calls?? - thomas 1998-01-11
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOUNLINK-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>
None
</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOUNLINK-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_unlink</FUNCTION> deletes the specified large object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOUNLINK-2">
<TITLE>Usage
</TITLE>
<PARA>
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOIMPORT-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_import</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_import
</REFNAME>
<REFPURPOSE>import a large object from a Unix file
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOIMPORT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>import</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOIMPORT-2"><PRIMARY>pg_lo_import</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_import <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOIMPORT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Unix file name.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOIMPORT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>
None
XXX Does this return a lobjId? Is that the same as the objOid in other calls? thomas - 1998-01-11
</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOIMPORT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_import</FUNCTION> reads the specified file and places the contents into a large object.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOIMPORT-2">
<TITLE>Usage
</TITLE>
<PARA>
  <Function>pg_lo_import</Function> must be called within a BEGIN/END transaction block.
</PARA>
</REFSECT1>
</REFENTRY>

<!-- ********************************************************** -->

<REFENTRY ID="PGTCL-PGLOEXPORT-1">
<REFMETA>
<REFENTRYTITLE>pg_lo_export</REFENTRYTITLE>
<REFMISCINFO>PGTCL - Large Objects</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>pg_lo_export
</REFNAME>
<REFPURPOSE>export a large object to a Unix file
</REFPURPOSE>
<INDEXTERM ID="IX-PGTCL-PGLOEXPORT-1"><PRIMARY>pgtcl</PRIMARY><SECONDARY>export</SECONDARY></INDEXTERM>
<INDEXTERM ID="IX-PGTCL-PGLOEXPORT-2"><PRIMARY>pg_lo_export</PRIMARY></INDEXTERM>
</REFNAMEDIV>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1997-12-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
pg_lo_export <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">lobjId</REPLACEABLE> <REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
</SYNOPSIS>

<REFSECT2 ID="R2-PGTCL-PGLOEXPORT-1">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Inputs
</TITLE>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">conn</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>Specifies a valid database connection.
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">lobjId</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Large object identifier.
XXX Is this the same as the objOid in other calls?? thomas - 1998-01-11
</PARA>
</LISTITEM>
</VARLISTENTRY>
<VARLISTENTRY>
<TERM>
  <REPLACEABLE CLASS="PARAMETER">filename</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
Unix file name.
</PARA>
</LISTITEM>
</VARLISTENTRY>
</VARIABLELIST>
</REFSECT2>

<REFSECT2 ID="R2-PGTCL-PGLOEXPORT-2">
<REFSECT2INFO>
<DATE>1997-12-24</DATE>
</REFSECT2INFO>
<TITLE>Outputs
</TITLE>
<PARA>
None
XXX Does this return a lobjId? Is that the same as the objOid in other calls? thomas - 1998-01-11
</PARA>
</REFSECT2>
</REFSYNOPSISDIV>

<REFSECT1 ID="R1-PGTCL-PGLOEXPORT-1">
<REFSECT1INFO>
<DATE>1997-12-24</DATE>
</REFSECT1INFO>
<TITLE>Description
</TITLE>
<PARA><FUNCTION>pg_lo_export</FUNCTION> writes the specified large object into a Unix file.
</PARA>
</REFSECT1>
<REFSECT1 ID="R1-PGTCL-PGLOEXPORT-2">
<TITLE>Usage
</TITLE>
<PARA>
  <Function>pg_lo_export</Function> must be called within a BEGIN/END transaction block.
</PARA>
</REFSECT1>
</REFENTRY>

</Sect1>
</Chapter>
