typedef struct sqlite3_blob sqlite3_blob;
An instance of this object represents an open BLOB on which incremental BLOB I/O can be performed. Objects of this type are created by sqlite3_blob_open() and destroyed by sqlite3_blob_close(). The sqlite3_blob_read() and sqlite3_blob_write() interfaces can be used to read or write small subsections of the BLOB. The sqlite3_blob_bytes() interface returns the size of the BLOB in bytes.