mysqli_result::fetch_assoc

mysqli_fetch_assoc

(PHP 5)

mysqli_result::fetch_assoc -- mysqli_fetch_assoc — Fetch a result row as an associative array

说明

面向对象风格

array mysqli_result::fetch_assoc ( void )

过程化风格

array mysqli_fetch_assoc ( mysqli_result $result )

Returns an associative array that corresponds to the fetched row or NULL if there are no more rows.

Note: 此函数返回的字段名大小写敏感。

Note: 此函数将 NULL 字段设置为 PHP NULL 值。

参数

result: 仅以过程化样式：由 mysqli_query()，mysqli_store_result() 或 mysqli_use_result() 返回的结果集标识。

返回值

Returns an associative array of strings representing the fetched row in the result set, where each key in the array represents the name of one of the result set's columns or NULL if there are no more rows in resultset.

If two or more columns of the result have the same field names, the last column will take precedence. To access the other column(s) of the same name, you either need to access the result with numeric indices by using mysqli_fetch_row() or add alias names.

范例

Example #1 面向对象风格


<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$query = "SELECT Name, CountryCode FROM City ORDER by ID DESC LIMIT 50,5";

if ($result = $mysqli->query($query)) {

    /* fetch associative array */
    while ($row = $result->fetch_assoc()) {
        printf ("%s (%s)\n", $row["Name"], $row["CountryCode"]);
    }

    /* free result set */
    $result->free();
}

/* close connection */
$mysqli->close();
?>

Example #2 过程化风格


<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$query = "SELECT Name, CountryCode FROM City ORDER by ID DESC LIMIT 50,5";

if ($result = mysqli_query($link, $query)) {

    /* fetch associative array */
    while ($row = mysqli_fetch_assoc($result)) {
        printf ("%s (%s)\n", $row["Name"], $row["CountryCode"]);
    }

    /* free result set */
    mysqli_free_result($result);
}

/* close connection */
mysqli_close($link);
?>

以上例程会输出：

Pueblo (USA)
Arvada (USA)
Cape Coral (USA)
Green Bay (USA)
Santa Clara (USA)

Example #3 A mysqli_result example comparing iterator usage


<?php
$c = mysqli_connect('127.0.0.1','user', 'pass');

// Using iterators (support was added with PHP 5.4)
foreach ( $c->query('SELECT user,host FROM mysql.user') as $row ) {
    printf("'%s'@'%s'\n", $row['user'], $row['host']);
}

echo "\n==================\n";

// Not using iterators
$result = $c->query('SELECT user,host FROM mysql.user');
while ($row = $result->fetch_assoc()) {
    printf("'%s'@'%s'\n", $row['user'], $row['host']);
}

?>

以上例程的输出类似于：

'root'@'192.168.1.1'
'root'@'127.0.0.1'
'dude'@'localhost'
'lebowski'@'localhost'

==================

'root'@'192.168.1.1'
'root'@'127.0.0.1'
'dude'@'localhost'
'lebowski'@'localhost'

参见

mysqli_fetch_array() - Fetch a result row as an associative, a numeric array, or both
mysqli_fetch_row() - Get a result row as an enumerated array
mysqli_fetch_object() - Returns the current row of a result set as an object
mysqli_query() - Performs a query on the database
mysqli_data_seek() - Adjusts the result pointer to an arbitary row in the result

PHP手册 - N: Fetch a result row as an associative array

用户评论:

james dot phx at gmail dot com (12-Aug-2011 01:58)

IMPORTANT NOTE: If you were used to using code like this: <?php while(false !== ($row = mysql_fetch_assoc($result)) { //... } ?> You must change it to this for mysqli: <?php while(null !== ($row = mysqli_fetch_assoc($result)) { //... } ?> The former will cause your script to run until max_execution_time is reached.

geoffrey dot hoffman at gmail dot com (13-Nov-2009 07:43)

[This describes the syntax difference in calling $result->fetch_assoc().] <?php /* fetch associative array works inside a while loop */ while ($row = $result->fetch_assoc()) { printf ("%s (%s)\n", $row["Name"], $row["CountryCode"]); } // works /* fetch associative array doesn't work inside a foreach */ foreach($result->fetch_assoc() as $row) { printf ("%s (%s)\n", $row["Name"], $row["CountryCode"]); } // fails ?>