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>Chapter 32. Large Objects</H1
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><DT
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>Table of Contents</B
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>32.1. <A
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>Introduction</A
></DT
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>32.2. <A
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>Implementation Features</A
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>32.3.1. <A
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>Creating a Large Object</A
></DT
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>32.3.2. <A
HREF="lo-interfaces.html#LO-IMPORT"
>Importing a Large Object</A
></DT
><DT
>32.3.3. <A
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>Exporting a Large Object</A
></DT
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>32.3.4. <A
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>Opening an Existing Large Object</A
></DT
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>32.3.5. <A
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>Writing Data to a Large Object</A
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>Reading Data from a Large Object</A
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>32.3.7. <A
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>Seeking in a Large Object</A
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>32.3.8. <A
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>Obtaining the Seek Position of a Large Object</A
></DT
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>32.3.9. <A
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>Truncating a Large Object</A
></DT
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>32.3.10. <A
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>Closing a Large Object Descriptor</A
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>Removing a Large Object</A
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><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
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