Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp > Class Template Reference

Forward declaration. More...

#include <row_proxy.h>

Public Types
using	Type_info_t = Row_proxy_type_info< Typecode_tp, typecode_end_tp, column_count_tp >

Public Member Functions
	Row_proxy (const typename Type_info_t::Row_view_definition_t &row_proxy_definition)
	Construct a new Row_proxy for rows in a table whose schema is described by the given Type_info_t::Row_view_definition_t. More...
void	clear ()
	Make the proxy be a view over an "empty" row, which has NULL in all nullable fields and 0/"" in non-nullable fields. More...
void	set_row (const typename Type_info_t::Row_t &row)
	Make the proxy be a view over the given row. More...
void	copy_field (int index, PSI_field *target) const
	Copy the value of the given field of the current row to the target. More...

Private Attributes
const Type_info_t::Row_view_definition_t &	m_row_proxy_definition
	Array where the Nth entry is the definition of the Nth column. More...
const Type_info_t::Field_t *	m_field_by_typecode [Type_info_t::typecode_end]
	Current map from m_type code to row value. More...

Detailed Description

template<class Typecode_tp, Typecode_tp typecode_end_tp, std::size_t column_count_tp>
requires requires
class Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp >

Forward declaration.

Fills values in fields in a table row, using an Array_view<Field<Typecode_tp>> as data source (in namespace mysql::abi_helpers), for a given enum type Typecode_tp.

This does not copy or allocate data; internally it only holds fixed-size arrays that map column numbers to type codes in the enum type, and in turn each type code to a field in the row. Using this information, when queried with a column index and a PSI_field, it fills the PSI_field with the correct value from the source data.

The object is meant to be reused for multiple queries to the same table. At construction time, it creates the map associating column number with type code, and for each row the user gives, it recreates the map from type codes to field data.

Template Parameters

Typecode_tp	enum type that identifies each column, used in the template argument of Field.
typecode_end_tp	enum item whose numeric value is greater than the largest enum value that represents a field in a packet.
column_count_tp	The number of columns in the table.

Member Typedef Documentation

Type_info_t

template<class Typecode_tp , Typecode_tp typecode_end_tp, std::size_t column_count_tp>

using Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp >::Type_info_t = Row_proxy_type_info<Typecode_tp, typecode_end_tp, column_count_tp>

Constructor & Destructor Documentation

Row_proxy()

template<class Typecode_tp , Typecode_tp typecode_end_tp, std::size_t column_count_tp>

Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp >::Row_proxy ( const typename Type_info_t::Row_view_definition_t &  row_proxy_definition )

inline

Construct a new Row_proxy for rows in a table whose schema is described by the given Type_info_t::Row_view_definition_t.

Parameters

row_proxy_definition

Description of table definition and packet layout. This is an std::array with column_count_tp elements, each representing a table column. Each element has three members: the typecode of the packet where the field value is found; the typecode of the packet holding a boolean that indicates whether the value is NULL; and the SQL data type.

See also

Field_view_definition .

Member Function Documentation

clear()

template<class Typecode_tp , Typecode_tp typecode_end_tp, std::size_t column_count_tp>

void Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp >::clear ( )

inline

Make the proxy be a view over an "empty" row, which has NULL in all nullable fields and 0/"" in non-nullable fields.

copy_field()

template<class Typecode_tp , Typecode_tp typecode_end_tp, std::size_t column_count_tp>

void Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp >::copy_field ( int  index, PSI_field *  target  ) const

inline

Copy the value of the given field of the current row to the target.

Parameters

index	The column index.
target	Opaque pointer (PSI_field *) to the target field.

If more types are needed, see e.g. plugin/replication_observers_example/src/binlog/service/iterator/tests/pfs.cc

set_row()

template<class Typecode_tp , Typecode_tp typecode_end_tp, std::size_t column_count_tp>

void Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp >::set_row ( const typename Type_info_t::Row_t &  row )

inline

Make the proxy be a view over the given row.

Parameters

row	Object holding values for all fields in this row.

Member Data Documentation

m_field_by_typecode

template<class Typecode_tp , Typecode_tp typecode_end_tp, std::size_t column_count_tp>

const Type_info_t::Field_t* Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp >::m_field_by_typecode[Type_info_t::typecode_end]

private

Current map from m_type code to row value.

m_row_proxy_definition

template<class Typecode_tp , Typecode_tp typecode_end_tp, std::size_t column_count_tp>

const Type_info_t::Row_view_definition_t& Row_proxy< Typecode_tp, typecode_end_tp, column_count_tp >::m_row_proxy_definition

private

Array where the Nth entry is the definition of the Nth column.

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The documentation for this class was generated from the following file:

• components/replication_applier_metrics/row_proxy.h