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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

class PDOStatement {

string fetchColumn ( [int column_number] )

}

Returns a single column from the next row of a result set or FALSE if there are no more rows.

参数

column_number

0-indexed 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 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("name = $result\n");

print("Fetch the second column from the next row in the result set:\n");
$result = $sth->fetchColumn(1);
print("colour = $result\n");
?>

上例将输出：

Fetch the first column from the next row in the result set:
name = lemon
Fetch the second column from the next row in the result set:
colour = red

参见

PDO->query()
PDOStatement->fetch()
PDOStatement->fetchAll()
PDO->prepare()
PDOStatement->setFetchMode()

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