libpqxx 4.0.1

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pqxx::tuple Class Reference

Reference to one row in a result. More...

`#include <tuple.hxx>`

Inheritance diagram for pqxx::tuple:

## Public Types

typedef tuple_size_type | size_type
typedef tuple_difference_type | difference_type
typedef const_tuple_iterator | const_iterator
typedef const_iterator | iterator
typedef field | reference
typedef const_tuple_iterator | pointer
typedef const_reverse_tuple_iterator | const_reverse_iterator
typedef const_reverse_iterator | reverse_iterator

## Public Member Functions

| tuple (const result *r, size_t i) throw ()
| ~tuple () throw ()
const_iterator | begin () const throw ()
const_iterator | end () const throw ()
size_type | size () const throw ()
void | swap (tuple &) throw ()
size_t | rownumber () const throw ()
size_t | num () const
tuple | slice (size_type Begin, size_type End) const
bool PQXX_PURE | empty () const throw ()
Comparison
bool PQXX_PURE | operator== (const tuple &) const throw ()
bool | operator!= (const tuple &rhs) const throw ()
Field access
reference | front () const throw ()
reference | back () const throw ()
const_reverse_tuple_iterator | rbegin () const
const_reverse_tuple_iterator | rend () const
reference | operator[] (size_type) const throw ()
reference | operator[] (int) const throw ()
reference | operator[] (const char[]) const
reference | operator[] (const std::string &) const
reference | at (size_type) const throw (pqxx::range_error)
reference | at (int) const throw (pqxx::range_error)
reference | at (const char[]) const
reference | at (const std::string &) const
Column information
size_type | column_number (const std::string &ColName) const
| Number of given column (throws exception if it doesn't exist)
size_type | column_number (const char[]) const
| Number of given column (throws exception if it doesn't exist)
oid | column_type (size_type) const
| Type of given column.
oid | column_type (int ColNum) const
| Type of given column.
oid | column_type (const std::string &ColName) const
| Type of given column.
oid | column_type (const char ColName[]) const
| Type of given column.
oid | column_table (size_type ColNum) const
| What table did this column come from?
oid | column_table (int ColNum) const
| What table did this column come from?
oid | column_table (const std::string &ColName) const
| What table did this column come from?
size_type | table_column (size_type) const
| What column number in its table did this result column come from?
size_type | table_column (int ColNum) const
| What column number in its table did this result column come from?
size_type | table_column (const std::string &ColName) const
| What column number in its table did this result column come from?

## Protected Attributes

const result * | m_Home
size_t | m_Index
size_type | m_Begin
size_type | m_End

## Friends

class | field

## Detailed Description

Reference to one row in a result.

A tuple represents one row (also called a tuple) in a query result set. It also acts as a container mapping column numbers or names to field values (see below):

cout << tuple["date"].c_str() << ": " << tuple["name"].c_str() << endl;

The tuple itself acts like a (non-modifyable) container, complete with its own const_iterator and const_reverse_iterator.

## Member Typedef Documentation

typedef const_tuple_iterator pqxx::tuple::const_iterator

typedef const_reverse_tuple_iterator pqxx::tuple::const_reverse_iterator

typedef tuple_difference_type pqxx::tuple::difference_type

typedef const_iterator pqxx::tuple::iterator

typedef const_tuple_iterator pqxx::tuple::pointer

typedef field pqxx::tuple::reference

typedef const_reverse_iterator pqxx::tuple::reverse_iterator

typedef tuple_size_type pqxx::tuple::size_type

## Constructor & Destructor Documentation

pqxx::tuple::tuple | ( | const result * | r,
|  | size_t | i
| ) |  | throw ()

Deprecated:
  Do not use this constructor. It will become private.

References tuple().

Referenced by tuple().

pqxx::tuple::~tuple | ( |  | ) | throw ()

## Member Function Documentation

pqxx::field pqxx::tuple::at | ( | size_type | i | ) | const throw (pqxx::range_error)

pqxx::tuple::reference pqxx::tuple::at | ( | int | i | ) | const throw (pqxx::range_error)

pqxx::field pqxx::tuple::at | ( | const char | f[] | ) | const

pqxx::tuple::reference pqxx::tuple::at | ( | const std::string & | s | ) | const

pqxx::tuple::reference pqxx::tuple::back | ( |  | ) | const throw ()

pqxx::tuple::const_iterator pqxx::tuple::begin | ( |  | ) | const throw ()

size_type pqxx::tuple::column_number | ( | const std::string & | ColName | ) | const

Number of given column (throws exception if it doesn't exist)

References column_number().

Referenced by column_number().

pqxx::tuple::size_type pqxx::tuple::column_number | ( | const char | ColName[] | ) | const

Number of given column (throws exception if it doesn't exist)

References pqxx::result::column_number().

pqxx::oid pqxx::tuple::column_table | ( | size_type | ColNum | ) | const

What table did this column come from?

oid pqxx::tuple::column_table | ( | int | ColNum | ) | const

What table did this column come from?

References column_table().

Referenced by column_table().

oid pqxx::tuple::column_table | ( | const std::string & | ColName | ) | const

What table did this column come from?

References column_table().

Referenced by column_table().

pqxx::oid pqxx::tuple::column_type | ( | size_type | ColNum | ) | const

Type of given column.

oid pqxx::tuple::column_type | ( | int | ColNum | ) | const

Type of given column.

References column_type().

Referenced by column_type().

oid pqxx::tuple::column_type | ( | const std::string & | ColName | ) | const

Type of given column.

References column_type().

Referenced by column_type().

oid pqxx::tuple::column_type | ( | const char | ColName[] | ) | const

Type of given column.

References column_type().

Referenced by column_type().

bool pqxx::tuple::empty | ( |  | ) | const throw ()

pqxx::tuple::const_iterator pqxx::tuple::end | ( |  | ) | const throw ()

pqxx::tuple::reference pqxx::tuple::front | ( |  | ) | const throw ()

size_t pqxx::tuple::num | ( |  | ) | const

Referenced by pqxx::const_result_iterator::operator-().

bool pqxx::tuple::operator!= | ( | const tuple & | rhs | ) | const throw ()

bool pqxx::tuple::operator== | ( | const tuple & | rhs | ) | const throw ()

pqxx::tuple::reference pqxx::tuple::operator[] | ( | size_type | i | ) | const throw ()

pqxx::tuple::reference pqxx::tuple::operator[] | ( | int | i | ) | const throw ()

pqxx::tuple::reference pqxx::tuple::operator[] | ( | const char | f[] | ) | const

pqxx::tuple::reference pqxx::tuple::operator[] | ( | const std::string & | s | ) | const

pqxx::tuple::const_reverse_iterator pqxx::tuple::rbegin | ( |  | ) | const

pqxx::tuple::const_reverse_iterator pqxx::tuple::rend | ( |  | ) | const

size_t pqxx::tuple::rownumber | ( |  | ) | const throw ()

size_type pqxx::tuple::size | ( |  | ) | const throw ()

pqxx::tuple pqxx::tuple::slice | ( | size_type | Begin,
|  | size_type | End
| ) |  | const

Produce a slice of this tuple, containing the given range of columns.

The slice runs from the range's starting column to the range's end column, exclusive. It looks just like a normal result tuple, except slices can be empty.

Warning
  Slicing is a relatively new feature, and not all software may be prepared to deal with empty slices. If there is any chance that your program might be creating empty slices and passing them to code that may not be designed with the possibility of empty tuples in mind, be sure to test for that case.

References m_Begin, and m_End.

void pqxx::tuple::swap | ( | tuple & | rhs | ) | throw ()

pqxx::tuple::size_type pqxx::tuple::table_column | ( | size_type | ColNum | ) | const

What column number in its table did this result column come from?

A meaningful answer can be given only if the column in question comes directly from a column in a table. If the column is computed in any other way, a logic_error will be thrown.

Parameters

  ColNum | a zero-based column number in this result set

Returns
  a zero-based column number in originating table

Requires libpq from PostgreSQL 7.4 or better, as well as a server version of at least 7.4.

size_type pqxx::tuple::table_column | ( | int | ColNum | ) | const

What column number in its table did this result column come from?

References table_column().

Referenced by table_column().

size_type pqxx::tuple::table_column | ( | const std::string & | ColName | ) | const

What column number in its table did this result column come from?

References table_column().

Referenced by table_column().

## Friends And Related Function Documentation

friend class field

friend

## Member Data Documentation

size_type pqxx::tuple::m_Begin

protected

Referenced by slice().

size_type pqxx::tuple::m_End

protected

Referenced by slice().

const result* pqxx::tuple::m_Home

protected

size_t pqxx::tuple::m_Index

protected

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

- tuple.hxx
- tuple.cxx