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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Large Objects</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REV="MADE" HREF="mailto:pgsql-docs@postgresql.org"><LINK REL="HOME" TITLE="PostgreSQL 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="Client Interfaces" HREF="client-interfaces.html"><LINK REL="PREVIOUS" TITLE="Example Programs" HREF="libpq-example.html"><LINK REL="NEXT" TITLE="Introduction" HREF="lo-intro.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="stylesheet.css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1"><META NAME="creation" CONTENT="2017-11-06T22:43:11"></HEAD ><BODY CLASS="CHAPTER" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Example Programs" HREF="libpq-example.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="client-interfaces.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="Introduction" HREF="lo-intro.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="LARGEOBJECTS" ></A >Chapter 32. Large Objects</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT >32.1. <A HREF="lo-intro.html" >Introduction</A ></DT ><DT >32.2. <A HREF="lo-implementation.html" >Implementation Features</A ></DT ><DT >32.3. <A HREF="lo-interfaces.html" >Client Interfaces</A ></DT ><DD ><DL ><DT >32.3.1. <A HREF="lo-interfaces.html#LO-CREATE" >Creating a Large Object</A ></DT ><DT >32.3.2. <A HREF="lo-interfaces.html#LO-IMPORT" >Importing a Large Object</A ></DT ><DT >32.3.3. <A HREF="lo-interfaces.html#LO-EXPORT" >Exporting a Large Object</A ></DT ><DT >32.3.4. <A HREF="lo-interfaces.html#LO-OPEN" >Opening an Existing Large Object</A ></DT ><DT >32.3.5. <A HREF="lo-interfaces.html#LO-WRITE" >Writing Data to a Large Object</A ></DT ><DT >32.3.6. <A HREF="lo-interfaces.html#LO-READ" >Reading Data from a Large Object</A ></DT ><DT >32.3.7. <A HREF="lo-interfaces.html#LO-SEEK" >Seeking in a Large Object</A ></DT ><DT >32.3.8. <A HREF="lo-interfaces.html#LO-TELL" >Obtaining the Seek Position of a Large Object</A ></DT ><DT >32.3.9. <A HREF="lo-interfaces.html#LO-TRUNCATE" >Truncating a Large Object</A ></DT ><DT >32.3.10. <A HREF="lo-interfaces.html#LO-CLOSE" >Closing a Large Object Descriptor</A ></DT ><DT >32.3.11. <A HREF="lo-interfaces.html#LO-UNLINK" >Removing a Large Object</A ></DT ></DL ></DD ><DT >32.4. <A HREF="lo-funcs.html" >Server-side Functions</A ></DT ><DT >32.5. <A HREF="lo-examplesect.html" >Example Program</A ></DT ></DL ></DIV ><P > <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > has a <I CLASS="FIRSTTERM" >large object</I > facility, which provides stream-style access to user data that is stored in a special large-object structure. Streaming access is useful when working with data values that are too large to manipulate conveniently as a whole. </P ><P > This chapter describes the implementation and the programming and query language interfaces to <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > large object data. We use the <SPAN CLASS="APPLICATION" >libpq</SPAN > C library for the examples in this chapter, but most programming interfaces native to <SPAN CLASS="PRODUCTNAME" >PostgreSQL</SPAN > support equivalent functionality. Other interfaces might use the large object interface internally to provide generic support for large values. This is not described here. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="libpq-example.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="lo-intro.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Example Programs</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="client-interfaces.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Introduction</TD ></TR ></TABLE ></DIV ></BODY ></HTML >