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NCBI C++ ToolKit: src/db/bdb/bdb_cursor.cpp Source File

m_FetchDirection(eForward),

m_FirstFetched(

),

m_MultiFetchMode(eFetchAll),

m_LastMultiFetchSuccess(

)

m_FetchDirection(eForward),

m_FirstFetched(

),

m_MultiFetchMode(eFetchAll),

m_LastMultiFetchSuccess(

)

}

(exception& ) {

(cond_from ==

|| cond_from ==

) {

(cond_to ==

|| cond_to ==

) {

(cond_from ==

|| cond_from ==

) {

(cond_to ==

|| cond_to ==

) {

(cond_from ==

) {

(cond_from ==

) {

(eIdxSearch,

);

(eIdxSearch,

);

(eInvalidValue,

);

(eInvalidOperation,

);

(eInvalidValue,

);

(eInvalidOperation,

);

(eInvalidOperation,

);

(eInvalidValue,

);

(

err =

->c_count(

, &ret, 0) )

(err,

);

( cond_from ) {

(eIdxSearch,

);

multirow_only =

;

multirow_only =

;

, buf_size, allow_realloc);

, buf_size, allow_realloc);

, buf_size, allow_realloc);

, buf_size, allow_realloc);

flag = 0;

multirow_only =

;

multirow_only =

;

, buf_size, allow_realloc);

static unsigned int s_FDir2DBFlag(CBDB_FileCursor::EFetchDirection fdir)

Berkeley BDB file cursor.

Wrapper around Berkeley DB environment structure.

BDB Data Field Buffer manager class.

File cursor condition handle.

BDB environment object a collection including support for some or all of caching, locking,...

Internal class used by CBDB_FileCursor to represent search condition criteries.

const CBDB_FC_Condition & operator=(const CBDB_FC_Condition &)

CBDB_BufferManager m_Buf

Field buffer.

unsigned int IncFieldsAssigned()

+1 increment of number of assigned fields.

CBDB_FC_Condition(const CBDB_BufferManager &key_buf, CBDB_FileCursor &cursor)

Constructor. key_buf - key buffer of the main table.

bool IsComplete() const

Return TRUE if all search criteria fileds have been assigned.

unsigned int GetFieldsAssigned() const

Get number of fields assigned to condition.

CBDB_FileCursor & m_Cursor

Reference on parent cursor.

const CBDB_BufferManager & GetBuffer() const

Get field buffer reference (const)

IBDB_FieldConvert & GetUnassignedField()

Return next unassigned field.

CBDB_BufferManager & GetBuffer()

Get field buffer reference (non-const)

unsigned int m_FieldsAssigned

Number of fields assigned (for multi-segment) prefix searches.

const CBDB_BufferManager & m_KeyBuf

Reference on "parent file" key buffer.

void InitUnassignedFields(EIncompleteVal incv)

Set incomplete (non assigned) fields to min(max) possible values.

void ResetUnassigned()

Set number of assigned fields to zero.

CBDB_FC_Condition(const CBDB_FC_Condition &)

Berkeley DB file cursor class.

Multirow buffer for reading many rows in one call.

Reallocable memory buffer (no memory copy overhead) Mimics vector<>, without the overhead of explicit...

BDB Data Field conversion interface definition.

void x_FetchFirst_Prolog(unsigned int &flag)

IBDB_FieldConvert & GetFieldConvert(CBDB_BufferManager &buf, unsigned int n)

Return next field's IBDB_FieldConvert interface (hidden cast to non-public parent class)

CBDB_ConditionHandle & operator<<(int val)

size_t GetLastDataLen() const

Get BLOB length from last cursor read.

bool m_FirstFetched

Flag if FetchFirst is already been done.

unsigned long TRecordCount

const void * GetLastMultiFetchData() const

Get data pointer from last fetch (only when in multifetch mode)

TRecordCount KeyDupCount() const

void SetCondition(ECondition cond_from, ECondition cond_to=eNotSet)

Set search condition(type of interval)

bool TestTo() const

Test "TO" search criteria. Return "true" if current value satisfies it.

EBDB_ErrCode FetchFirst()

bool m_LastMultiFetchSuccess

when true, last multifetch was successfull

CBDB_FC_Condition & m_Condition

EBDB_ErrCode Update(CBDB_File::EAfterWrite write_flag=CBDB_File::eDiscardData)

unsigned int m_FetchFlags

Type of locking (conventional or RMW)

EBDB_ErrCode UpdateBlob(const void *data, size_t size, CBDB_File::EAfterWrite write_flag=CBDB_File::eDiscardData)

ECondition m_CondTo

To condition proxy-object.

CBDB_Transaction * GetBDBTransaction()

Get current transaction.

ECursorUpdateType

Type of locking when fetching records.

size_t GetLastMultiFetchDataLen() const

Get data length from last fetch (only when in multifetch mode)

bool IsOpen() const

TRUE when cursor open.

EBDB_ErrCode ReadCursor(DBC *dbc, unsigned int bdb_flag)

Read DB cursor.

void ReOpen(CBDB_Transaction *trans)

Reopen cursor after Close.

EMultiFetchMode

Fetch mode regulates multi-row fetches eFetchAll (default mode) when buffer ends, cursor automaticall...

CBDB_Env * GetEnv()

Get pointer on file environment Return NULL if no environment has been set.

void InitMultiFetch(size_t buffer_size, EMultiFetchMode mfm=eFetchAll)

Init multi-row fetch.

EBDB_ErrCode DeleteCursor(DBC *dbc, EIgnoreError)

Delete DB cursor.

CBDB_MultiRowBuffer * m_MultiRowBuf

Buffer class for multiple fetch.

EBDB_ErrCode WriteCursor(DBC *dbc, unsigned int bdb_flag, EAfterWrite write_flag)

Write DB cursor.

DBC * CreateCursor(CBDB_Transaction *trans=0, unsigned int flags=0) const

Create DB cursor.

void Close()

Close underlying cursor.

EReallocMode

BLOB read mode, controld data buffer reallocation when there is not enough space in buffer.

EFetchDirection m_FetchDirection

Fetch direction (forward/backward)

EMultiFetchMode m_MultiFetchMode

Multifetch control mode.

CBDB_File & m_Dbf

Reference on the "mother" file.

const void * GetLastDataPtr() const

Get data buffer pointer from last cursor read.

EBDB_ErrCode

BDB Return codes.

void ResetFirstFetched()

Set m_FirstFetched field to FALSE.

CBDB_FileCursor(CBDB_File &dbf, ECursorUpdateType utype=eReadUpdate)

EBDB_ErrCode Fetch(EFetchDirection fdir=eDefault)

Fetch record.

ECondition m_CondFrom

From condition proxy-object.

CBDB_ConditionHandle From

CBDB_ConditionHandle(CBDB_FC_Condition &cond)

unique_ptr< CBDB_BufferManager > m_KeyBuf

DBC * m_DBC

Berkeley DB DBC thing.

EBDB_ErrCode Delete(CBDB_File::EIgnoreError on_error=CBDB_File::eThrowOnError)

@ eReadModifyUpdate

Use DB_RMW (write locking) on fetch.

void SetMinVal(unsigned int idx_from, unsigned int idx_to)

Set minimum possible value to buffer fields from 'idx_from' to 'idx_to'.

virtual void SetString(const char *)

unsigned int FieldCount() const

Return number of fields attached using function Bind.

void Construct()

Create internal data buffer, assign places in this buffer to the fields.

virtual void SetStdString(const string &)

virtual void SetDouble(double)

virtual void SetFloat(float)

void DuplicateStructureFrom(const CBDB_BufferManager &buf_mgr)

Duplicate (dynamic allocation is used) all fields from 'buf_mgr' and bind them to the this buffer man...

virtual void SetUint(unsigned)

void SetMaxVal(unsigned int idx_from, unsigned int idx_to)

Set maximum possible value to buffer fields from 'idx_from' to 'idx_to'.

void DeleteFields(CBDB_BufferManager &buf)

#define BDB_ERRNO_THROW(errnum, message)

#define BDB_THROW(errcode, message)

#define END_NCBI_SCOPE

End previously defined NCBI scope.

#define BEGIN_NCBI_SCOPE

Define ncbi namespace.

const struct ncbi::grid::netcache::search::fields::SIZE size

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