PDOStatement->getColumnMeta()
(PHP 5 >= 5.1.0, PECL pdo:0.2-1.0.3)
PDOStatement->getColumnMeta() — Returns metadata for a column in a result set
Description
Deze functie is EXPERIMENTEEL. Dat betekent, dat het gedrag van deze functie, deze functienaam, in concreto ALLES dat hier gedocumenteerd is in een toekomstige uitgave van PHP ZONDER WAARSCHUWING kan veranderen. Wees gewaarschuwd, en gebruik deze functie op eigen risico.
Retrieves the metadata for a 0-indexed column in a result set as an associative array.
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:
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
Version | Description |
---|---|
5.2.3 | table field |
Voorbeelden
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);
?>
Het resultaat van dit script is als volgt:
array(6) { ["native_type"]=> string(7) "integer" ["flags"]=> array(0) { } ["name"]=> string(8) "COUNT(*)" ["len"]=> int(-1) ["precision"]=> int(0) ["pdo_type"]=> int(2) }