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BLOB Datatype → The BLOB datatype 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 Data Type → You use the BLOB data type to store large binary objects in the database, inline or out-of-line … . Every BLOB variable stores a locator, which points to a large binary object. BLOB s participate fully … committed or rolled back. BLOB locators can span transactions (for reads only), but they cannot span sessions.
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 Datatype → The BLOB datatype stores unstructured binary data in the database. BLOB s can store up to 128 … terabytes of binary data. BLOB s participate fully in transactions. Changes made to a BLOB value by the … DBMS_LOB package, PL/SQL, or the OCI can be committed or rolled back. However, BLOB locators cannot
Method Summary → Blob() Blob class constructor. append() Appends a specified BLOB to the end of the current BLOB … . close() Closes a previously opened BLOB. closeStream() Closes the Stream object obtained from the BLOB … . copy() Copies a specified portion of a BFILE or BLOB into the
isInitialized() → Tests whether the Blob object is initialized. If the Blob object is initialized, then TRUE is
operator==() → Compares two Blob objects for equality. 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 equal, then TRUE is … returned; otherwise, FALSE is returned. Syntax bool operator==( const Blob &srcBlob)
setNull() → Sets the Blob object to atomically NULL. Syntax void setNull();
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
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.
getChunkSize() → Returns the smallest data size to perform efficient writes to the BLOB. Syntax unsigned int getChunkSize() const;
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
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
setOptions() → and deduplication of BLOB s. See Table 7-1, \"Values of Type LobOptionType\" and Table 7-2 … not configured on the database column or partition that stores the BLOB. Will throw an exception if … attempting to turn off encryption in an encrypted BLOB column. Syntax void setOptions
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
isNull() → Tests whether the Blob object is atomically NULL. If the Blob object is atomically NULL, then TRUE
read() → Reads a part or all of the BLOB into a buffer. The actual number of bytes read is returned. Syntax … greater than or equal to 1. buffer The buffer that the BLOB data is to be read into. Valid values are … numbers greater than or equal to amt. buffsize The size of the buffer that the BLOB data is to be … to begin reading data from
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.
close() → Closes a BLOB. Syntax void close();
copy() → Copies a part or all of a BFILE or BLOB into the current BLOB. Syntax Description void copy( const … ); Copies a part of a BFILE into the current BLOB. void copy( const Blob &srcBlob, unsigned int numBytes … , unsigned int dstOffset = 1, unsigned int srcOffset = 1); Copies a part of a BLOB into the current