Golang rocksdb_writebatch_delete Examples

Example #1

File: rocksdb.go Project: joshuawatson/cockroach

// writeBatch applies the puts, merges and deletes atomically via
// the RocksDB write batch facility. The list must only contain
// elements of type Batch{Put,Merge,Delete}.
func (r *RocksDB) writeBatch(cmds []interface{}) error {
	if len(cmds) == 0 {
		return nil
	}
	batch := C.rocksdb_writebatch_create()
	defer C.rocksdb_writebatch_destroy(batch)
	for i, e := range cmds {
		switch v := e.(type) {
		case BatchDelete:
			if len(v) == 0 {
				return emptyKeyError()
			}
			C.rocksdb_writebatch_delete(
				batch,
				(*C.char)(unsafe.Pointer(&v[0])),
				C.size_t(len(v)))
		case BatchPut:
			key, value := v.Key, v.Value
			valuePointer := (*C.char)(nil)
			if len(value.Bytes) > 0 {
				valuePointer = (*C.char)(unsafe.Pointer(&value.Bytes[0]))
			}

			// We write the batch before returning from this method, so we
			// don't need to worry about the GC reclaiming the data stored.
			C.rocksdb_writebatch_put(
				batch,
				(*C.char)(unsafe.Pointer(&key[0])),
				C.size_t(len(key)),
				valuePointer,
				C.size_t(len(value.Bytes)))
		case BatchMerge:
			key, value := v.Key, v.Value
			valuePointer := (*C.char)(nil)
			if len(value.Bytes) > 0 {
				valuePointer = (*C.char)(unsafe.Pointer(&value.Bytes[0]))
			}
			C.rocksdb_writebatch_merge(
				batch,
				(*C.char)(unsafe.Pointer(&key[0])),
				C.size_t(len(key)),
				valuePointer,
				C.size_t(len(value.Bytes)))
		default:
			panic(fmt.Sprintf("illegal operation #%d passed to writeBatch: %v", i, reflect.TypeOf(v)))
		}
	}

	var cErr *C.char
	C.rocksdb_write(r.rdb, r.wOpts, batch, &cErr)
	if cErr != nil {
		return charToErr(cErr)
	}
	return nil
}

Example #2

File: db.go Project: tradia/gotable

func (db *DB) Del(rawKey []byte, wb *WriteBatch) error {
	var ck = (*C.char)(unsafe.Pointer(&rawKey[0]))

	if wb == nil {
		var errStr *C.char
		C.rocksdb_delete(db.db, db.wOpt, ck, C.size_t(len(rawKey)), &errStr)
		if errStr != nil {
			defer C.free(unsafe.Pointer(errStr))
			return errors.New(C.GoString(errStr))
		}
	} else {
		C.rocksdb_writebatch_delete(wb.batch, ck, C.size_t(len(rawKey)))
	}

	return nil
}

Example #3

File: rocksdb.go Project: Joinhack/cockroach

// writeBatch applies all puts and deletes atomically via RocksDB write
// batch facility.
func (r *RocksDB) writeBatch(puts []KeyValue, dels []Key) error {
	batch := C.rocksdb_writebatch_create()
	defer C.rocksdb_writebatch_destroy(batch)

	for _, put := range puts {
		key, value := put.Key, put.Value
		if len(key) == 0 {
			return emptyKeyError()
		}

		// Empty values correspond to a null pointer.
		valuePointer := (*C.char)(nil)
		if len(value.Bytes) > 0 {
			valuePointer = (*C.char)(unsafe.Pointer(&value.Bytes[0]))
		}

		// We write the batch before returning from this method, so we
		// don't need to worry about the GC reclaiming the data stored in
		// the "puts" and "dels" parameters.
		C.rocksdb_writebatch_put(
			batch,
			(*C.char)(unsafe.Pointer(&key[0])),
			C.size_t(len(key)),
			valuePointer,
			C.size_t(len(value.Bytes)))
	}

	for _, key := range dels {
		if len(key) == 0 {
			return emptyKeyError()
		}
		C.rocksdb_writebatch_delete(
			batch,
			(*C.char)(unsafe.Pointer(&key[0])),
			C.size_t(len(key)))
	}

	var cErr *C.char
	C.rocksdb_write(r.rdb, r.wOpts, batch, &cErr)
	if cErr != nil {
		return charToErr(cErr)
	}

	return nil
}

Example #4

File: write_batch.go Project: daaku/gorocksdb

// Delete queues a deletion of the data at key.
func (w *WriteBatch) Delete(key []byte) {
	cKey := byteToChar(key)
	C.rocksdb_writebatch_delete(w.c, cKey, C.size_t(len(key)))
}

Example #5

File: batch.go Project: Abioy/ledisdb

func (w *WriteBatch) Delete(key []byte) {
	C.rocksdb_writebatch_delete(w.wbatch,
		(*C.char)(unsafe.Pointer(&key[0])), C.size_t(len(key)))
}