The handle of a connection to the database in which the large object exists.
A descriptor for the large object from
The string to write to the large object (not a variable name, but the value itself).
The maximum number of bytes to write. The number written will be the smaller of this value and the length of the string.
The number of bytes actually written is returned; this will ordinarily be the same as the number requested. In event of an error, the return value is negative.