Golang Value.SetInt方法代碼示例

func setAppliedIndex(
	ctx context.Context,
	eng engine.ReadWriter,
	ms *enginepb.MVCCStats,
	rangeID roachpb.RangeID,
	appliedIndex,
	leaseAppliedIndex uint64,
) error {
	var value roachpb.Value
	value.SetInt(int64(appliedIndex))

	if err := engine.MVCCPut(ctx, eng, ms,
		keys.RaftAppliedIndexKey(rangeID),
		hlc.ZeroTimestamp,
		value,
		nil /* txn */); err != nil {
		return err
	}
	value.SetInt(int64(leaseAppliedIndex))
	return engine.MVCCPut(ctx, eng, ms,
		keys.LeaseAppliedIndexKey(rangeID),
		hlc.ZeroTimestamp,
		value,
		nil /* txn */)
}

func setLastIndex(
	ctx context.Context, eng engine.ReadWriter, rangeID roachpb.RangeID, lastIndex uint64,
) error {
	var value roachpb.Value
	value.SetInt(int64(lastIndex))

	return engine.MVCCPut(ctx, eng, nil, keys.RaftLastIndexKey(rangeID),
		hlc.ZeroTimestamp,
		value,
		nil /* txn */)
}

// GetInitialValues returns the set of initial K/V values which should be added to
// a bootstrapping CockroachDB cluster in order to create the tables contained
// in the schema.
func (ms MetadataSchema) GetInitialValues() []roachpb.KeyValue {
	var ret []roachpb.KeyValue

	// Save the ID generator value, which will generate descriptor IDs for user
	// objects.
	value := roachpb.Value{}
	value.SetInt(int64(keys.MaxReservedDescID + 1))
	ret = append(ret, roachpb.KeyValue{
		Key:   keys.DescIDGenerator,
		Value: value,
	})

	// addDescriptor generates the needed KeyValue objects to install a
	// descriptor on a new cluster.
	addDescriptor := func(parentID ID, desc DescriptorProto) {
		// Create name metadata key.
		value := roachpb.Value{}
		value.SetInt(int64(desc.GetID()))
		ret = append(ret, roachpb.KeyValue{
			Key:   MakeNameMetadataKey(parentID, desc.GetName()),
			Value: value,
		})

		// Create descriptor metadata key.
		value = roachpb.Value{}
		wrappedDesc := WrapDescriptor(desc)
		if err := value.SetProto(wrappedDesc); err != nil {
			log.Fatalf(context.TODO(), "could not marshal %v", desc)
		}
		ret = append(ret, roachpb.KeyValue{
			Key:   MakeDescMetadataKey(desc.GetID()),
			Value: value,
		})
	}

	// Generate initial values for system databases and tables, which have
	// static descriptors that were generated elsewhere.
	for _, sysObj := range ms.descs {
		addDescriptor(sysObj.parentID, sysObj.desc)
	}

	// Other key/value generation that doesn't fit into databases and
	// tables. This can be used to add initial entries to a table.
	ret = append(ret, ms.otherKV...)

	// Sort returned key values; this is valuable because it matches the way the
	// objects would be sorted if read from the engine.
	sort.Sort(roachpb.KeyValueByKey(ret))
	return ret
}

// MarshalColumnValue returns a Go primitive value equivalent of val, of the
// type expected by col. If val's type is incompatible with col, or if
// col's type is not yet implemented, an error is returned.
func MarshalColumnValue(col ColumnDescriptor, val parser.Datum) (roachpb.Value, error) {
	var r roachpb.Value

	if val == parser.DNull {
		return r, nil
	}

	switch col.Type.Kind {
	case ColumnType_BOOL:
		if v, ok := val.(*parser.DBool); ok {
			r.SetBool(bool(*v))
			return r, nil
		}
	case ColumnType_INT:
		if v, ok := val.(*parser.DInt); ok {
			r.SetInt(int64(*v))
			return r, nil
		}
	case ColumnType_FLOAT:
		if v, ok := val.(*parser.DFloat); ok {
			r.SetFloat(float64(*v))
			return r, nil
		}
	case ColumnType_DECIMAL:
		if v, ok := val.(*parser.DDecimal); ok {
			err := r.SetDecimal(&v.Dec)
			return r, err
		}
	case ColumnType_STRING:
		if v, ok := val.(*parser.DString); ok {
			r.SetString(string(*v))
			return r, nil
		}
	case ColumnType_BYTES:
		if v, ok := val.(*parser.DBytes); ok {
			r.SetString(string(*v))
			return r, nil
		}
		if v, ok := val.(*parser.DString); ok {
			r.SetString(string(*v))
			return r, nil
		}
	case ColumnType_DATE:
		if v, ok := val.(*parser.DDate); ok {
			r.SetInt(int64(*v))
			return r, nil
		}
	case ColumnType_TIMESTAMP:
		if v, ok := val.(*parser.DTimestamp); ok {
			r.SetTime(v.Time)
			return r, nil
		}
	case ColumnType_TIMESTAMPTZ:
		if v, ok := val.(*parser.DTimestampTZ); ok {
			r.SetTime(v.Time)
			return r, nil
		}
	case ColumnType_INTERVAL:
		if v, ok := val.(*parser.DInterval); ok {
			err := r.SetDuration(v.Duration)
			return r, err
		}
	default:
		return r, errors.Errorf("unsupported column type: %s", col.Type.Kind)
	}
	return r, fmt.Errorf("value type %s doesn't match type %s of column %q",
		val.ResolvedType(), col.Type.Kind, col.Name)
}

// marshalValue returns a roachpb.Value initialized from the source
// interface{}, returning an error if the types are not compatible.
func marshalValue(v interface{}) (roachpb.Value, error) {
	var r roachpb.Value

	// Handle a few common types via a type switch.
	switch t := v.(type) {
	case *roachpb.Value:
		return *t, nil

	case nil:
		return r, nil

	case bool:
		r.SetBool(t)
		return r, nil

	case string:
		r.SetBytes([]byte(t))
		return r, nil

	case []byte:
		r.SetBytes(t)
		return r, nil

	case inf.Dec:
		err := r.SetDecimal(&t)
		return r, err

	case roachpb.Key:
		r.SetBytes([]byte(t))
		return r, nil

	case time.Time:
		r.SetTime(t)
		return r, nil

	case duration.Duration:
		err := r.SetDuration(t)
		return r, err

	case proto.Message:
		err := r.SetProto(t)
		return r, err

	case roachpb.Value:
		panic("unexpected type roachpb.Value (use *roachpb.Value)")
	}

	// Handle all of the Go primitive types besides struct and pointers. This
	// switch also handles types based on a primitive type (e.g. "type MyInt
	// int").
	switch v := reflect.ValueOf(v); v.Kind() {
	case reflect.Bool:
		r.SetBool(v.Bool())
		return r, nil

	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		r.SetInt(v.Int())
		return r, nil

	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		r.SetInt(int64(v.Uint()))
		return r, nil

	case reflect.Float32, reflect.Float64:
		r.SetFloat(v.Float())
		return r, nil

	case reflect.String:
		r.SetBytes([]byte(v.String()))
		return r, nil
	}

	return r, fmt.Errorf("unable to marshal %T: %v", v, v)
}

func inlineValueIntEncodedSize(v int64) int {
	var value roachpb.Value
	value.SetInt(v)
	meta := enginepb.MVCCMetadata{RawBytes: value.RawBytes}
	return meta.Size()
}