pg_lo_read — Read from a large object
pg_lo_readconn
descriptor
bufVar
len
conn
The handle of the connection.
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.
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.
If an error occurs reading from the large object, a negative number will be returned. Other errors result in a Tcl error being thrown. Note that error handling for this command is different from most of the other Large Object commands.