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

capacity =

.capacity();

(capacity >

.size()) {

.resize_mem(capacity);

(

.size() == 0) {

m_BlobSize(blob_size)

->flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;

(ret,

);

* bytes_written)

->flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;

(ret,

);

*bytes_written =

;

m_BlobSize(blob_size)

->flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;

->flags = DB_DBT_USERMEM | DB_DBT_PARTIAL;

+= (unsigned)buf_size;

can_update?0:DB_NOOVERWRITE

(ret == DB_KEYEXIST)

(ret == DB_NOTFOUND)

((ret == DB_BUFFER_SMALL) && (

->data == 0)) {

(ret == DB_NOTFOUND)

(*BDB_CompareFunction_V6)(

*,

*,

*,

BDB_Uint4Compare_V6(

* db,

* dbt1,

* dbt2,

*)

BDB_ByteSwap_Uint4Compare_V6(

* db,

* dbt1,

* dbt2,

BDB_CompareFunction_V6 func = BDB_Uint4Compare_V6;

func = BDB_ByteSwap_Uint4Compare_V6;

ret =

->set_bt_compare(

, func);

BDB library BLOB support.

Wrapper around Berkeley DB transaction structure.

int(* BDB_CompareFunction)(DB *, const DBT *, const DBT *)

Berkeley DB BLOB File class.

Berkeley DB BLOB File stream.

Stream style BDB BLOB reader.

BDB errno exception class.

static Int4 GetInt4(const unsigned char *ptr)

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

A very basic data-read interface.

virtual ERW_Result Read(void *buf, size_t count, size_t *bytes_read)

Read as many as "count" bytes into a buffer pointed to by the "buf" argument.

size_t LobSize() const

Get LOB size. Becomes available right after successfull Fetch.

virtual ERW_Result Write(const void *buf, size_t count, size_t *bytes_written)

Write up to "count" bytes from the buffer pointed to by the "buf" argument onto the output device.

size_t LobSize() const

Get LOB size. Becomes available right after successfull Fetch.

EBDB_ErrCode Insert(const void *data, size_t size)

Insert BLOB into the database.

CBDB_BLobFile(EDuplicateKeys dup_keys=eDuplicatesDisable, EDBType db_type=eBtree)

EBDB_ErrCode ReadRealloc(TBuffer &buffer)

Read BLOB into vector.

void SetTransaction(CBDB_Transaction *trans)

Set current transaction for BLOB stream.

void SetTransaction(CBDB_Transaction *trans)

Set current transaction.

EBDB_ErrCode Fetch(unsigned int lob_id)

Fetch LOB record.

EBDB_ErrCode UpdateInsert(const void *data, size_t size)

Insert or update BLOB.

EBDB_ErrCode GetData(void *buf, size_t size)

Copy LOB data into the 'buf'.

virtual void SetHash(DB *)

Hash for this type returns id (key);.

void Read(void *buf, size_t buf_size, size_t *bytes_read)

Read data from BLOB.

virtual void SetCmp(DB *)

Comparison function for unsigned int key.

EBDB_ErrCode Fetch()

Fetch the record corresponding to the current key value.

CBDB_IdBlobFile(EDuplicateKeys dup_keys=eDuplicatesDisable, EDBType db_type=eBtree)

EBDB_ErrCode x_Put(unsigned int lob_id, const void *data, size_t size, bool can_update)

CBDB_BLobStream * CreateStream()

Creates stream like object to retrieve or write BLOB by chunks.

EBDB_ErrCode Insert(unsigned int lob_id, const void *data, size_t size)

Insert BLOB data into the database, does nothing if key exists.

virtual ERW_Result PendingCount(size_t *count)

Via parameter "count" (which is guaranteed to be supplied non-NULL) return the number of bytes that a...

void Write(const void *buf, size_t buf_size)

Write data into BLOB.

CBDB_BlobReaderWriter * CreateReaderWriter()

Creates stream like object to retrieve or write BLOB by chunks.

CBDB_BLobStream(DB *db, DBT *dbt_key, size_t blob_size, DB_TXN *txn)

IReader * CreateReader()

Creates stream like object to read BLOB by chunks.

unsigned Append(const void *data, size_t size)

CBDB_BlobReaderWriter(DB *db, DBT *dbt_key, size_t blob_size, DB_TXN *txn)

EBDB_ErrCode GetData(void *buf, size_t size)

Copy LOB data into the 'buf'.

virtual ERW_Result Flush(void)

Flush pending data (if any) down to the output device.

CBDB_FieldUint4 id

ID key.

EBDB_ErrCode InsertUpdate(unsigned int lob_id, const void *data, size_t size)

Insert or Update BLOB data into the database.

unsigned Append(EAfterWrite write_flag=eDiscardData)

Append record to the queue (works only for DB_QUEUE database type)

static void DestroyDBT_Clone(DBT *dbt)

Free the DBT structure created by CloneDBT_Key.

bool IsByteSwapped() const

Return TRUE if the if the underlying database files were created on an architecture of the different ...

DBT * CloneDBT_Key()

Create new copy of m_DBT_Key.

void DisableDataBufProcessing()

Function disables processing of m_DBT_data.

EBDB_ErrCode Insert(EAfterWrite write_flag=eDiscardData)

Insert new record.

EBDB_ErrCode UpdateInsert(EAfterWrite write_flag=eDiscardData)

Update record corresponding to the current key value.

EDBType

Berkeley DB database type.

EDuplicateKeys

Control key duplicates in Btree.

void BindKey(const char *field_name, CBDB_Field *key_field, size_t buf_size=0)

DB_TXN * GetTxn()

Get transaction handler.

EReallocMode

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

const string & FileName() const

EBDB_ErrCode

BDB Return codes.

unsigned GetRecLen() const

Get record length Works for fixed length record DBs only (Queue)

EBDB_ErrCode Fetch()

Fetches the record corresponding to the current key value.

unsigned int BDB_Uint4Hash(DB *, const void *bytes, unsigned length)

Hash method for databases with a single (unique) UInt4 key.

int BDB_Uint4Compare(DB *, const DBT *val1, const DBT *val2)

int BDB_ByteSwap_Uint4Compare(DB *, const DBT *val1, const DBT *val2)

bool IsBufferSmall() const

Returns TRUE if error is BerekleyDB DB_BUFFER_SMALL (insufficient buffer size)

DB_TXN * GetTxn()

Get low level Berkeley DB transaction handle.

#define BDB_CHECK(errnum, x_db_object__)

bool IsNoMem() const

Returns TRUE if error is BerekleyDB ENOMEM (insufficient buffer size)

uint32_t Uint4

4-byte (32-bit) unsigned integer

#define END_NCBI_SCOPE

End previously defined NCBI scope.

#define BEGIN_NCBI_SCOPE

Define ncbi namespace.

ERW_Result

Result codes for I/O operations.

@ eRW_Success

Everything is okay, I/O completed.

unsigned int

A callback function used to compare two keys in a database.

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

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