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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

## Description

mixed PDOStatement::getColumnMeta ( int column )

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

警告
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:

表格 1. 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.
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.

## �d��

範例 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)
    }

## �Ѧ�

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

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