コード例 #1
0
ファイル: db.go プロジェクト: daaku/gorocksdb
// Merge merges the data associated with the key with the actual data in the database.
func (db *DB) Merge(opts *WriteOptions, key []byte, value []byte) error {
	var (
		cErr   *C.char
		cKey   = byteToChar(key)
		cValue = byteToChar(value)
	)
	C.rocksdb_merge(db.c, opts.c, cKey, C.size_t(len(key)), cValue, C.size_t(len(value)), &cErr)
	return convertErr(cErr)
}
コード例 #2
0
ファイル: db.go プロジェクト: C0rWin/fabric
// Merge merges the data associated with the key with the actual data in the database.
func (db *DB) Merge(opts *WriteOptions, key []byte, value []byte) error {
	var (
		cErr   *C.char
		cKey   = byteToChar(key)
		cValue = byteToChar(value)
	)
	C.rocksdb_merge(db.c, opts.c, cKey, C.size_t(len(key)), cValue, C.size_t(len(value)), &cErr)
	if cErr != nil {
		defer C.free(unsafe.Pointer(cErr))
		return errors.New(C.GoString(cErr))
	}
	return nil
}
コード例 #3
0
ファイル: rocksdb.go プロジェクト: GavinHwa/cockroach
// Merge implements the RocksDB merge operator using the function goMergeInit
// to initialize missing values and goMerge to merge the old and the given
// value into a new value, which is then stored under key.
// Currently 64-bit counter logic is implemented. See the documentation of
// goMerge and goMergeInit for details.
//
// The key and value byte slices may be reused safely. merge takes a copy
// of them before returning.
func (r *RocksDB) Merge(key Key, value []byte) error {
	if len(key) == 0 {
		return emptyKeyError()
	}

	// rocksdb_merge calls memcpy() (by way of MemTable::Add)
	// when called, so we do not need to worry about these byte slices being
	// reclaimed by the GC.
	var cErr *C.char
	C.rocksdb_merge(
		r.rdb,
		r.wOpts,
		bytesPointer(key),
		C.size_t(len(key)),
		bytesPointer(value),
		C.size_t(len(value)),
		&cErr)

	if cErr != nil {
		return charToErr(cErr)
	}
	return nil
}