BLOB value at the head of this SQLInputImpl object as a Blob object in the Java programming language. This method does not perform type-safe checking to determine if the returned type is the expected type as this responsibility is delegated to the UDT mapping as implemented by a SQLData implementation.
@return a Blob object representing the SQLBLOB value at the head of this stream; if the value is SQL NULL, return null
@throws SQLException if the read position is located at an invalidposition; or if there are no further values in the stream.
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