DataHandler

A data handler contains a number of callback methods, mostly related to CLOB and BLOB handling. The most important implementing class is a database.

Methods
void	checkPowerOff() Check if the simulated power failure occurred.
void	checkPowerOff() throws DbException Check if the simulated power failure occurred. This call will decrement the countdown. Throws: DbException - if the simulated power failure occurred
void	checkWritingAllowed() Check if writing is allowed.
void	checkWritingAllowed() throws DbException Check if writing is allowed. Throws: DbException - if it is not allowed
CompareMode	getCompareMode() Return compare mode.
CompareMode	getCompareMode() Return compare mode. Returns: Compare mode.
String	getDatabasePath() Get the database path.
String	getDatabasePath() Get the database path. Returns: the database path
JavaObjectSerializer	getJavaObjectSerializer() Return the serializer to be used for java objects being stored in column of type OTHER.
JavaObjectSerializer	getJavaObjectSerializer() Return the serializer to be used for java objects being stored in column of type OTHER. Returns: the serializer to be used for java objects being stored in column of type OTHER
String	getLobCompressionAlgorithm(int type) Get the compression algorithm used for large objects.
String	getLobCompressionAlgorithm(int type) Get the compression algorithm used for large objects. Parameters: type - the data type (CLOB or BLOB) Returns: the compression algorithm, or null
SmallLRUCache	getLobFileListCache() Get the lob file list cache if it is used.
SmallLRUCache	getLobFileListCache() Get the lob file list cache if it is used. Returns: the cache or null
LobStorageInterface	getLobStorage() Get the lob storage mechanism to use.
LobStorageInterface	getLobStorage() Get the lob storage mechanism to use. Returns: the lob storage mechanism
Object	getLobSyncObject() Get the synchronization object for lob operations.
Object	getLobSyncObject() Get the synchronization object for lob operations. Returns: the synchronization object
int	getMaxLengthInplaceLob() Get the maximum length of a in-place large object
int	getMaxLengthInplaceLob() Get the maximum length of a in-place large object Returns: the maximum size
TempFileDeleter	getTempFileDeleter() Get the temp file deleter mechanism.
TempFileDeleter	getTempFileDeleter() Get the temp file deleter mechanism. Returns: the temp file deleter
FileStore	openFile(String name, String mode, boolean mustExist) Open a file at the given location.
FileStore	openFile(String name, String mode, boolean mustExist) Open a file at the given location. Parameters: name - the file name mode - the mode mustExist - whether the file must already exist Returns: the file
int	readLob(long lobId, byte[] hmac, long offset, byte[] buff, int off, int length) Read from a lob.
int	readLob(long lobId, byte[] hmac, long offset, byte[] buff, int off, int length) Read from a lob. Parameters: lobId - the lob id hmac - the message authentication code offset - the offset within the lob buff - the target buffer off - the offset within the target buffer length - the number of bytes to read Returns: the number of bytes read