kyotocabinet::DB::Cursor Class Reference

Interface of cursor to indicate a record. More...

#include <kcdb.h>

List of all members.

Public Member Functions

virtual ~Cursor ()
 Destructor.
virtual bool accept (Visitor *visitor, bool writable=true, bool step=false)=0
 Accept a visitor to the current record.
virtual bool set_value (const char *vbuf, size_t vsiz, bool step=false)=0
 Set the value of the current record.
virtual bool set_value (const std::string &value, bool step=false)=0
 Set the value of the current record.
virtual bool remove ()=0
 Remove the current record.
virtual char * get_key (size_t *sp, bool step=false)=0
 Get the key of the current record.
virtual std::string * get_key (bool step=false)=0
 Get the key of the current record.
virtual char * get_value (size_t *sp, bool step=false)=0
 Get the value of the current record.
virtual std::string * get_value (bool step=false)=0
 Get the value of the current record.
virtual char * get (size_t *ksp, const char **vbp, size_t *vsp, bool step=false)=0
 Get a pair of the key and the value of the current record.
virtual std::pair< std::string,
std::string > * 
get_pair (bool step=false)=0
 Get a pair of the key and the value of the current record.
virtual bool jump ()=0
 Jump the cursor to the first record.
virtual bool jump (const char *kbuf, size_t ksiz)=0
 Jump the cursor to a record.
virtual bool jump (const std::string &key)=0
 Jump the cursor to a record.
virtual bool step ()=0
 Step the cursor to the next record.
virtual DBdb ()=0
 Get the database object.

Detailed Description

Interface of cursor to indicate a record.


Constructor & Destructor Documentation

virtual kyotocabinet::DB::Cursor::~Cursor (  )  [virtual]

Member Function Documentation

virtual bool kyotocabinet::DB::Cursor::accept ( Visitor visitor,
bool  writable = true,
bool  step = false 
) [pure virtual]

Accept a visitor to the current record.

Parameters:
visitor a visitor object.
writable true for writable operation, or false for read-only operation.
step true to move the cursor to the next record, or false for no move.
Returns:
true on success, or false on failure.

Implemented in kyotocabinet::CacheDB::Cursor, kyotocabinet::HashDB::Cursor, kyotocabinet::PolyDB::Cursor, kyotocabinet::ProtoDB< STRMAP >::Cursor, and kyotocabinet::TreeDB::Cursor.

virtual bool kyotocabinet::DB::Cursor::set_value ( const char *  vbuf,
size_t  vsiz,
bool  step = false 
) [pure virtual]

Set the value of the current record.

Parameters:
vbuf the pointer to the value region.
vsiz the size of the value region.
step true to move the cursor to the next record, or false for no move.
Returns:
true on success, or false on failure.

Implemented in kyotocabinet::FileDB::Cursor.

virtual bool kyotocabinet::DB::Cursor::set_value ( const std::string &  value,
bool  step = false 
) [pure virtual]

Set the value of the current record.

Note:
Equal to the original Cursor::set_value method except that the parameter is std::string.

Implemented in kyotocabinet::FileDB::Cursor.

virtual bool kyotocabinet::DB::Cursor::remove (  )  [pure virtual]

Remove the current record.

Returns:
true on success, or false on failure.
Note:
If no record corresponds to the key, false is returned. The cursor is moved to the next record implicitly.

Implemented in kyotocabinet::FileDB::Cursor.

virtual char* kyotocabinet::DB::Cursor::get_key ( size_t *  sp,
bool  step = false 
) [pure virtual]

Get the key of the current record.

Parameters:
sp the pointer to the variable into which the size of the region of the return value is assigned.
step true to move the cursor to the next record, or false for no move.
Returns:
the pointer to the key region of the current record, or NULL on failure.
Note:
If the cursor is invalidated, NULL is returned. Because an additional zero code is appended at the end of the region of the return value, the return value can be treated as a C-style string. Because the region of the return value is allocated with the the new[] operator, it should be released with the delete[] operator when it is no longer in use.

Implemented in kyotocabinet::FileDB::Cursor.

virtual std::string* kyotocabinet::DB::Cursor::get_key ( bool  step = false  )  [pure virtual]

Get the key of the current record.

Note:
Equal to the original Cursor::get_key method except that the parameter and the return value are std::string. The return value should be deleted explicitly by the caller.

Implemented in kyotocabinet::FileDB::Cursor.

virtual char* kyotocabinet::DB::Cursor::get_value ( size_t *  sp,
bool  step = false 
) [pure virtual]

Get the value of the current record.

Parameters:
sp the pointer to the variable into which the size of the region of the return value is assigned.
step true to move the cursor to the next record, or false for no move.
Returns:
the pointer to the value region of the current record, or NULL on failure.
Note:
If the cursor is invalidated, NULL is returned. Because an additional zero code is appended at the end of the region of the return value, the return value can be treated as a C-style string. Because the region of the return value is allocated with the the new[] operator, it should be released with the delete[] operator when it is no longer in use.

Implemented in kyotocabinet::FileDB::Cursor.

virtual std::string* kyotocabinet::DB::Cursor::get_value ( bool  step = false  )  [pure virtual]

Get the value of the current record.

Note:
Equal to the original Cursor::get_value method except that the parameter and the return value are std::string. The return value should be deleted explicitly by the caller.

Implemented in kyotocabinet::FileDB::Cursor.

virtual char* kyotocabinet::DB::Cursor::get ( size_t *  ksp,
const char **  vbp,
size_t *  vsp,
bool  step = false 
) [pure virtual]

Get a pair of the key and the value of the current record.

Parameters:
ksp the pointer to the variable into which the size of the region of the return value is assigned.
vbp the pointer to the variable into which the pointer to the value region is assigned.
vsp the pointer to the variable into which the size of the value region is assigned.
step true to move the cursor to the next record, or false for no move.
Returns:
the pointer to the pair of the key region, or NULL on failure.
Note:
If the cursor is invalidated, NULL is returned. Because an additional zero code is appended at the end of each region of the key and the value, each region can be treated as a C-style string. The return value should be deleted explicitly by the caller with the detele[] operator.

Implemented in kyotocabinet::FileDB::Cursor.

virtual std::pair<std::string, std::string>* kyotocabinet::DB::Cursor::get_pair ( bool  step = false  )  [pure virtual]

Get a pair of the key and the value of the current record.

Returns:
the pointer to the pair of the key and the value, or NULL on failure.
Note:
Equal to the original Cursor::get method except that the return value is std::pair. The return value should be deleted explicitly by the caller.
If the cursor is invalidated, NULL is returned. The return value should be deleted explicitly by the caller.

Implemented in kyotocabinet::FileDB::Cursor.

virtual bool kyotocabinet::DB::Cursor::jump (  )  [pure virtual]

Jump the cursor to the first record.

Returns:
true on success, or false on failure.

Implemented in kyotocabinet::CacheDB::Cursor, kyotocabinet::HashDB::Cursor, kyotocabinet::PolyDB::Cursor, kyotocabinet::ProtoDB< STRMAP >::Cursor, and kyotocabinet::TreeDB::Cursor.

virtual bool kyotocabinet::DB::Cursor::jump ( const char *  kbuf,
size_t  ksiz 
) [pure virtual]

Jump the cursor to a record.

Parameters:
kbuf the pointer to the key region.
ksiz the size of the key region.
Returns:
true on success, or false on failure.

Implemented in kyotocabinet::CacheDB::Cursor, kyotocabinet::HashDB::Cursor, kyotocabinet::PolyDB::Cursor, kyotocabinet::ProtoDB< STRMAP >::Cursor, and kyotocabinet::TreeDB::Cursor.

virtual bool kyotocabinet::DB::Cursor::jump ( const std::string &  key  )  [pure virtual]

Jump the cursor to a record.

Note:
Equal to the original Cursor::set method except that the parameter is std::string.

Implemented in kyotocabinet::CacheDB::Cursor, kyotocabinet::HashDB::Cursor, kyotocabinet::PolyDB::Cursor, kyotocabinet::ProtoDB< STRMAP >::Cursor, and kyotocabinet::TreeDB::Cursor.

virtual bool kyotocabinet::DB::Cursor::step (  )  [pure virtual]

Step the cursor to the next record.

Returns:
true on success, or false on failure.

Implemented in kyotocabinet::CacheDB::Cursor, kyotocabinet::HashDB::Cursor, kyotocabinet::PolyDB::Cursor, kyotocabinet::ProtoDB< STRMAP >::Cursor, and kyotocabinet::TreeDB::Cursor.

virtual DB* kyotocabinet::DB::Cursor::db (  )  [pure virtual]

Generated on Tue Apr 27 21:44:18 2010 for Kyoto Cabinet by  doxygen 1.6.1