PostgreSQL 7.4.18 Documentation
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# pg_lo_read

## Name

pg_lo_read -- read from a large object

## Synopsis

    pg_lo_read conn descriptor bufVar len

## Description

`pg_lo_read` reads at most `len` bytes from a large object into a variable named `bufVar`.

## Arguments

`conn`

  The handle of a connection to the database in which the large object exists.

`descriptor`

  A descriptor for the large object from `pg_lo_open`.

`bufVar`

  The name of a buffer variable to contain the large object segment.

`len`

  The maximum number of bytes to read.

## Return Value

The number of bytes actually read is returned; this could be less than the number requested if the end of the large object is reached first. In event of an error, the return value is negative.

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