PHP 5.6.0beta1 released

PDOStatement::getColumnMeta

(PHP 5 >= 5.1.0, PECL pdo >= 0.2.0)

PDOStatement::getColumnMeta Returns metadata for a column in a result set

Descrição

public array PDOStatement::getColumnMeta ( int $column )
Aviso

Esta função é EXPERIMENTAL. O comportamento desta função, seu nome, incluindo toda documentação pode ser modificado sem aviso em futuras versões do PHP. Esta função deve ser usada por sua própria conta e risco.

Retrieves the metadata for a 0-indexed column in a result set as an associative array.

Aviso

Not all PDO drivers support PDOStatement::getColumnMeta().

Parâmetros

column

The 0-indexed column in the result set.

Valor Retornado

Returns an associative array containing the following values representing the metadata for a single column:

Column metadata
Name Value
native_type The PHP native type used to represent the column value.
driver:decl_type The SQL type used to represent the column value in the database. If the column in the result set is the result of a function, this value is not returned by PDOStatement::getColumnMeta().
flags Any flags set for this column.
name The name of this column as returned by the database.
table The name of this column's table as returned by the database.
len The length of this column. Normally -1 for types other than floating point decimals.
precision The numeric precision of this column. Normally 0 for types other than floating point decimals.
pdo_type The type of this column as represented by the PDO::PARAM_* constants.

Returns FALSE if the requested column does not exist in the result set, or if no result set exists.

Changelog

Versão Descrição
5.2.3 table field

Exemplos

Exemplo #1 Retrieving column metadata

The following example shows the results of retrieving the metadata for a single column generated by a function (COUNT) in a PDO_SQLITE driver.

<?php
$select 
$DB->query('SELECT COUNT(*) FROM fruit');
$meta $select->getColumnMeta(0);
var_dump($meta);
?>

O exemplo acima irá imprimir:

array(6) {
  ["native_type"]=>
  string(7) "integer"
  ["flags"]=>
  array(0) {
  }
  ["name"]=>
  string(8) "COUNT(*)"
  ["len"]=>
  int(-1)
  ["precision"]=>
  int(0)
  ["pdo_type"]=>
  int(2)
}

Veja Também

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User Contributed Notes 2 notes

up
3
colin at fusionbox dot com
5 years ago
This method is supported in the MySQL 5.0+ driver.  It can be used for object hydration:

<?php

$pdo_stmt
= $dbh->execute('SELECT discussion.id, discussion.text, comment.id, comment.text FROM discussions LEFT JOIN comments ON comment.discussion_id = discussion.id');

foreach(
range(0, $pdo_stmt->columnCount() - 1) as $column_index)
{
 
$meta[] = $pdo_stmt->getColumnMeta($column_index);
}

while(
$row = $pdo_stmt->fetch(PDO::FETCH_NUM))
{
  foreach(
$row as $column_index => $column_value)
  {
   
//do something with the data, using the ids to establish the discussion.has_many(comments) relationship.
 
}
}

?>

If you are building an ORM, this method is very useful to support more natural SQL syntax.  Most ORMs require the column names to be aliases so that they can be parsed and turned into objects that properly represent has_one, has_many, many_to_many relationships.
up
1
asohn aircanopy net
6 years ago
I found a short discussion related to this function at
http://www.sitepoint.com/forums/showthread.php?t=497257

I haven't tried it (yet?) but hopefully someone can find it useful.
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