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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