IndexHandle Class Reference

Class for accessing and updating the contents of a B+ tree index. More...

#include <IndexHandle.h>

List of all members.

Public Member Functions
ReturnCode	insertEntry (void *data, const RecordID *rid)
	Inserts a new entry into the index.
ReturnCode	deleteEntry (void *data, const RecordID *rid)
	Deletes an entry from the index.
ReturnCode	forcePage (int pageNo)
	Flushes the specified page to disk.
ReturnCode	forceAllPages ()
	Flushes all dirty pages to disk.

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Detailed Description

Class for accessing and updating the contents of a B+ tree index.

The IndexHandle class is used to insert and delete index entries, and to force pages of an index's files to disk. Index handles are obtained by calling IndexManager::openIndex, and freed by calling IndexManager::closeIndex.

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Member Function Documentation

ReturnCode IndexHandle::deleteEntry	(	void *	data,
		const RecordID *	rid
	)

Deletes an entry from the index.

Parameters:

	data	The key of the entry
	rid	The record id of the entry

Deletes the entry with record id rid and key value data from the index associated with the index handle. Returns RC_OK on success, RC_RECORD_NOT_FOUND if the specified record is not in the index, and other RC error codes otherwise.

ReturnCode IndexHandle::forceAllPages

(

)

Flushes all dirty pages to disk.

Flushes all dirty pages to disk. Returns RC_OK on success, or other ReturnCode values as specified in FileHandle::forceAllPages otherwise.

ReturnCode IndexHandle::forcePage

(

int

pageNo

)

Flushes the specified page to disk.

Parameters:

pageNo

The number of the page to flush

Flushes the specified page to disk. Returns RC_OK on success, or other ReturnCode values as specified in FileHandle::forcePage otherwise.

ReturnCode IndexHandle::insertEntry	(	void *	data,
		const RecordID *	rid
	)

Inserts a new entry into the index.

Parameters:

	data	The key of the new entry
	rid	The record id of the new entry

Inserts a new entry into the index associated with the index handle. The data parameter points to the key attribute value to be inserted into the index, and the rid parameter indentifies the record with that key to be added to the index. (The index should contain only the record's id, not the record itself.) If the indexed attribute is a character string of length n, then data may be assumed to be exactly n bytes long (but may not be null-terminated). Returns RC_OK on success, RC_RECORD_ALREADY_IN_INDEX if the record is already in the index, and other RC error codes otherwise.

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The documentation for this class was generated from the following files:

• /Users/green/Documents/workspace/DavisDB_public/IndexHandle.h
• /Users/green/Documents/workspace/DavisDB_public/IndexHandle.cpp