The in-memory representation of a Bigtable cell.
Bigtable stores data in rows, indexes by row keys. Each row may contain multiple column families, each column family might contain multiple columns, and each column has multiple cells indexed by timestamp. Notice that the storage is sparse, column families, columns, and timestamps might contain zero cells.
The Cell class owns all its data.
Constructors
Cell(KeyType &&, std::string, ColumnType &&, std::int64_t, ValueType &&, std::vector< std::string >)
Creates a Cell and fill it with data.
This function does not participate in overload resolution if ValueType is not an integral type. The case for integral types is handled by a separate overload.
| Parameters | |
|---|---|
| Name | Description |
row_key |
KeyType &&
|
family_name |
std::string
|
column_qualifier |
ColumnType &&
|
timestamp |
std::int64_t
|
value |
ValueType &&
|
labels |
std::vector< std::string >
|
typename KeyType |
|
typename ColumnType |
|
typename ValueType |
|
Cell(KeyType &&, std::string, ColumnType &&, std::int64_t, std::int64_t, std::vector< std::string >)
Create a Cell and fill it with a 64-bit value encoded as big endian.
| Parameters | |
|---|---|
| Name | Description |
row_key |
KeyType &&
|
family_name |
std::string
|
column_qualifier |
ColumnType &&
|
timestamp |
std::int64_t
|
value |
std::int64_t
|
labels |
std::vector< std::string >
|
typename KeyType |
|
typename ColumnType |
|
Cell(KeyType &&, std::string, ColumnType &&, std::int64_t, ValueType &&)
Create a cell and fill it with data, but with empty labels.
| Parameters | |
|---|---|
| Name | Description |
row_key |
KeyType &&
|
family_name |
std::string
|
column_qualifier |
ColumnType &&
|
timestamp |
std::int64_t
|
value |
ValueType &&
|
typename KeyType |
|
typename ColumnType |
|
typename ValueType |
|
Functions
row_key() const
Return the row key this cell belongs to.
The returned value is not valid after this object is deleted.
| Returns | |
|---|---|
| Type | Description |
RowKeyType const & |
|
family_name() const
Return the family this cell belongs to.
The returned value is not valid after this object is deleted.
| Returns | |
|---|---|
| Type | Description |
std::string const & |
|
column_qualifier() const
Return the column this cell belongs to.
The returned value is not valid after this object is deleted.
| Returns | |
|---|---|
| Type | Description |
ColumnQualifierType const & |
|
timestamp() const
Return the timestamp of this cell.
| Returns | |
|---|---|
| Type | Description |
std::chrono::microseconds |
|
value() const &
Return the contents of this cell.
The returned value is not valid after this object is deleted.
| Returns | |
|---|---|
| Type | Description |
CellValueType const & |
|
value() &&
Return the contents of this cell.
| Returns | |
|---|---|
| Type | Description |
CellValueType && |
|
decode_big_endian_integer() const
Interpret the value as a big-endian encoded T and return it.
Google Cloud Bigtable stores arbitrary blobs in each cell. Some applications interpret these blobs as strings, other as encoded protos, and sometimes as big-endian integers. This is a helper function to convert the blob into a T value.
| Parameter | |
|---|---|
| Name | Description |
typename T |
|
| Returns | |
|---|---|
| Type | Description |
StatusOr< T > |
|
labels() const
Return the labels applied to this cell by label transformer read filters.
| Returns | |
|---|---|
| Type | Description |
std::vector< std::string > const & |
|