PDOStatement::fetchColumn
(no version information, might be only in CVS)
PDOStatement::fetchColumn --
Returns a single column from the next row of a result set
说明
string
PDOStatement::fetchColumn ( [int column_number] )
Returns a single column from the next row of a result set.
参数
- column_number
Number of the column you wish to retrieve from the row. If no value is
supplied, PDOStatement::fetchColumn() fetches the
first column.
返回值
PDOStatement::fetchColumn() returns a single column
in the next row of a result set.
| 警告 |
There is no way to return another column from the same row if you
use PDOStatement::fetchColumn() to retrieve data.
|
范例
例子 1. Return first column of the next row
<?php
$sth = $dbh->prepare("SELECT name, colour FROM fruit");
$sth->execute();
/* Fetch the first column from the next row in the result set */
print("Fetch the first column from the next row in the result set:\n");
$result = $sth->fetchColumn();
print("$result\n");
$result = $sth->fetchColumn();
print("$result\n");
?>
|
上例将输出： Fetch the first column from the next row in the result set:
lemon
orange |
|
参见
| PDO::query() |
| PDOStatement::fetch() |
| PDOStatement::fetchAll() |
| PDOStatement::prepare() |
| PDOStatement::setFetchMode() |