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PDOStatement::getColumnMeta

(no version information, might be only in CVS)

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

Descrizione

mixed PDOStatement::getColumnMeta ( int column )

Avvertimento

Questa funzione è SPERIMENTALE. Ovvero, il comportamento di questa funzione, il nome di questa funzione, in definitiva tutto ciò che è documentato qui può cambiare nei futuri rilasci del PHP senza preavviso. Siete avvisati, l'uso di questa funzione è a vostro rischio.

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

Avvertimento

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

Elenco dei parametri

column

The 0-indexed column in the result set.

Valori restituiti

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

Tabella 1. Column metadata

NameValue
native_typeThe PHP native type used to represent the column value.
driver:decl_typeThe 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().
flagsAny flags set for this column.
nameThe name of this column as returned by the database.
lenThe length of this column. Normally -1 for types other than floating point decimals.
precisionThe numeric precision of this column. Normally 0 for types other than floating point decimals.
pdo_typeThe 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.

Esempi

Esempio 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);
?>

The above example will output:

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

Vedere anche:

PDOStatement::columnCount()
PDOStatement::rowCount()

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PDOStatement::getAttributeRisaliPDOStatement::rowCount

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Generated: 2007-01-26 17:56:31