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BLOB Data Type → The BLOB data type stores unstructured binary large objects. BLOB objects can be thought of as … bitstreams with no character set semantics. BLOB objects can store binary data up to (4 gigabytes -1 … creating a LOB column, then this is equivalent to (4 gigabytes - 1) * (database block size). BLOB … Interface (OCI)
Blob() → Blob class constructor. Syntax Description Blob(); Creates a NULL Blob object. Blob( const … Connection *connectionp); Creates an uninitialized Blob object. Blob( const Blob &srcBlob); Creates a copy … of a Blob object. Parameter Description connectionp
Blob Class → Blob Cl ass The Blob class defines the common properties of objects of type BLOB. A BLOB is a large … binary object stored as a column value in a row of a database table. A Blob object contains a … logical pointer to a BLOB, not the BLOB itself. Methods of the Blob
close() → Closes a BLOB. Syntax void close();
operator=() → Assigns a BLOB to the current BLOB. The source BLOB gets copied to the destination BLOB only when … the destination BLOB gets stored in the table. Syntax Blob& operator=( const Blob &srcBlob … ); Parameter Description srcBlob The source BLOB from which
getContentType() → Returns the content type of the Blob. If a content type has not been assigned, returns a NULL string. Syntax string getContentType();
getStream() → Returns a Stream object from the BLOB. If a stream is open, it is disallowed to open another stream … on Blob object, so the user must always close the stream before performing any Blob object … Description offset The starting position at which to begin reading data from the BLOB. If offset is not … specified,
setNull() → Sets the Blob object to atomically NULL. Syntax void setNull();
write() → Writes data from a buffer into a BLOB. This method implicitly opens the BLOB, copies the buffer … into the BLOB, and implicitly closes the BLOB. If the BLOB is open, use writeChunk() instead. The … to be written to the BLOB. buffer The buffer containing the data to be written to the
length() → Returns the number of bytes in the BLOB. Syntax unsigned int length() const;
setContentType() → Sets the content type of the Blob. If the Blob is not a SecureFile, throws an exception. Syntax … void setContentType( const string contenttype); Parameter Description contenttype The content type of the Blob. an ASCII Mime compliant string.
writeChunk() → Writes data from a buffer into a previously opened BLOB. The actual number of bytes written is … BLOB. buffer The buffer containing the data to be written to the BLOB. buffsize The size of the buffer … containing the data to be written to the BLOB. Valid values are numbers greater than or equal to amt … . offset
append() → Appends a BLOB to the end of the current BLOB. Syntax void append( const Blob &srcBlob); Parameter … Description srcBlob The BLOB object to be appended to the current BLOB object.
closeStream() → Closes the Stream object obtained from the BLOB. Syntax void closeStream( Stream *stream); Parameter Description stream The Stream to be closed.
open() → Opens the BLOB in read/write or read-only mode. Syntax void open( LobOpenMode mode … = OCCI_LOB_READWRITE); Parameter Description mode The mode the BLOB is to be opened in. Valid values are: OCCI_LOB_READWRITE OCCI_LOB_READONLY
getOptions() → Returns the BLOB 's LobOptionValue for a specified LobOptionType. Throws an exception if attempting … stores the BLOB. Syntax LobOptionValue getOptions( LobOptionType optType); Parameter Description
isNull() → Tests whether the Blob object is atomically NULL. If the Blob object is atomically NULL, then TRUE
operator!= () → Compares two Blob objects for inequality. Two Blob objects are equal if they both refer to the same … BLOB. Two NULL Blob objects are not considered equal. If the Blob objects are not equal, then TRUE … is returned; otherwise, FALSE is returned. Syntax bool operator!=( const Blob &srcBlob)
trim() → Truncates the BLOB to the new length specified. Syntax void trim( unsigned int newlen); Parameter … Description newlen The new length of the BLOB. Valid values are numbers less than or equal to the current length of the BLOB.
setEmpty() → Sets the Blob object to empty. Syntax Description void setEmpty(); Sets the Blob object to empty … . void setEmpty( const Connection* connectionp); Sets the Blob object to empty and initializes the … connection pointer to the passed parameter. Parameter Description connectionp The new connection pointer for the BLOB