示例#1
0
// decodeTableKey decodes a single element of a table key from b, returning the
// remaining (not yet decoded) bytes.
func decodeTableKey(b []byte, v reflect.Value) ([]byte, error) {
	switch t := v.Addr().Interface().(type) {
	case *[]byte:
		b, *t = roachencoding.DecodeBytes(b, nil)
		return b, nil
	case *string:
		var r []byte
		b, r = roachencoding.DecodeBytes(b, nil)
		*t = string(r)
		return b, nil
	}

	switch v.Kind() {
	case reflect.Bool:
		var i int64
		b, i = roachencoding.DecodeVarint(b)
		v.SetBool(i != 0)
		return b, nil

	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		var i int64
		b, i = roachencoding.DecodeVarint(b)
		v.SetInt(i)
		return b, nil

	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		var i uint64
		b, i = roachencoding.DecodeUvarint(b)
		v.SetUint(i)
		return b, nil

	case reflect.Float32, reflect.Float64:
		var f float64
		b, f = roachencoding.DecodeNumericFloat(b)
		v.SetFloat(f)
		return b, nil

	case reflect.String:
		var r []byte
		b, r = roachencoding.DecodeBytes(b, nil)
		v.SetString(string(r))
		return b, nil
	}

	return nil, fmt.Errorf("unable to decode key: %s", v)
}
示例#2
0
文件: conn.go 项目: Jaekyun/cockroach
func decodeIndexKey(desc *structured.TableDescriptor,
	index structured.IndexDescriptor, vals map[string]driver.Value, key []byte) ([]byte, error) {
	if !bytes.HasPrefix(key, keys.TableDataPrefix) {
		return nil, fmt.Errorf("%s: invalid key prefix: %q", desc.Name, key)
	}
	key = bytes.TrimPrefix(key, keys.TableDataPrefix)

	var tableID uint64
	key, tableID = encoding.DecodeUvarint(key)
	if uint32(tableID) != desc.ID {
		return nil, fmt.Errorf("%s: unexpected table ID: %d != %d", desc.Name, desc.ID, tableID)
	}

	var indexID uint64
	key, indexID = encoding.DecodeUvarint(key)
	if uint32(indexID) != index.ID {
		return nil, fmt.Errorf("%s: unexpected index ID: %d != %d", desc.Name, index.ID, indexID)
	}

	for _, id := range index.ColumnIDs {
		col, err := findColumnByID(desc, id)
		if err != nil {
			return nil, err
		}
		switch col.Type.Kind {
		case structured.ColumnType_BIT, structured.ColumnType_INT:
			var i int64
			key, i = encoding.DecodeVarint(key)
			vals[col.Name] = i
		case structured.ColumnType_FLOAT:
			var f float64
			key, f = encoding.DecodeNumericFloat(key)
			vals[col.Name] = f
		case structured.ColumnType_CHAR, structured.ColumnType_BINARY,
			structured.ColumnType_TEXT, structured.ColumnType_BLOB:
			var r []byte
			key, r = encoding.DecodeBytes(key, nil)
			vals[col.Name] = r
		default:
			return nil, fmt.Errorf("TODO(pmattis): decoded index key: %s", col.Type.Kind)
		}
	}

	return key, nil
}
示例#3
0
// decodeIndexKey decodes the values that are a part of the specified index
// key. Vals is a slice returned from makeIndexKeyVals. The remaining bytes in
// the index key are returned which will either be an encoded column ID for the
// primary key index, the primary key suffix for non-unique secondary indexes
// or unique secondary indexes containing NULL or empty.
func decodeIndexKey(desc *structured.TableDescriptor,
	index structured.IndexDescriptor, vals []parser.Datum, key []byte) ([]byte, error) {
	if !bytes.HasPrefix(key, keys.TableDataPrefix) {
		return nil, fmt.Errorf("%s: invalid key prefix: %q", desc.Name, key)
	}
	key = bytes.TrimPrefix(key, keys.TableDataPrefix)

	var tableID uint64
	key, tableID = encoding.DecodeUvarint(key)
	if structured.ID(tableID) != desc.ID {
		return nil, fmt.Errorf("%s: unexpected table ID: %d != %d", desc.Name, desc.ID, tableID)
	}

	var indexID uint64
	key, indexID = encoding.DecodeUvarint(key)
	if structured.IndexID(indexID) != index.ID {
		return nil, fmt.Errorf("%s: unexpected index ID: %d != %d", desc.Name, index.ID, indexID)
	}

	for j := range vals {
		switch vals[j].(type) {
		case parser.DInt:
			var i int64
			key, i = encoding.DecodeVarint(key)
			vals[j] = parser.DInt(i)
		case parser.DFloat:
			var f float64
			key, f = encoding.DecodeNumericFloat(key)
			vals[j] = parser.DFloat(f)
		case parser.DString:
			var r []byte
			key, r = encoding.DecodeBytes(key, nil)
			vals[j] = parser.DString(r)
		default:
			return nil, util.Errorf("TODO(pmattis): decoded index key: %s", vals[j].Type())
		}
	}

	return key, nil
}
示例#4
0
// decodeKeyVals decodes the values that are part of the key. Vals is a slice
// returned from makeKeyVals. The remaining bytes in the key after decoding the
// values are returned.
func decodeKeyVals(vals []parser.Datum, key []byte) ([]byte, error) {
	for j := range vals {
		switch vals[j].(type) {
		case parser.DInt:
			var i int64
			key, i = encoding.DecodeVarint(key)
			vals[j] = parser.DInt(i)
		case parser.DFloat:
			var f float64
			key, f = encoding.DecodeNumericFloat(key)
			vals[j] = parser.DFloat(f)
		case parser.DString:
			var r []byte
			key, r = encoding.DecodeBytes(key, nil)
			vals[j] = parser.DString(r)
		default:
			return nil, util.Errorf("TODO(pmattis): decoded index key: %s", vals[j].Type())
		}
	}

	return key, nil
}