PDOStatement::getColumnMeta

PDOStatement::getColumnMeta

(no version information, might be only in CVS)

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

Description

mixed PDOStatement::getColumnMeta ( int column )

Warning

This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.

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

Warning

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

Parameters

column

The 0-indexed column in the result set.

Return Values

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

Table 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.

Examples

Example 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)
}

See Also

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

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