mysqli_stmt

Description

Procedural style:

bool mysqli_stmt_fetch ( mysqli_stmt stmt )

Object oriented style (method):

class mysqli_stmt {

bool fetch ( void )

}

mysqli_stmt_fetch() fetch the result from a prepared statement into the variables bound by mysqli_stmt_bind_result().

注: Note that all columns must be bound by the application before calling mysqli_stmt_fetch().

范例

例子 1. Object oriented style


<?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 150,5";

if ($stmt = $mysqli->prepare($query)) {

    /* execute statement */
    $stmt->execute();

    /* bind result variables */
    $stmt->bind_result($name, $code);

    /* fetch values */
    while ($stmt->fetch()) {
        printf ("%s (%s)\n", $name, $code);
    }

    /* close statement */
    $stmt->close();
}

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

例子 2. Procedural style


<?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 150,5";

if ($stmt = mysqli_prepare($link, $query)) {

    /* execute statement */
    mysqli_stmt_execute($stmt);

    /* bind result variables */
    mysqli_stmt_bind_result($stmt, $name, $code);

    /* fetch values */
    while (mysqli_stmt_fetch($stmt)) {
        printf ("%s (%s)\n", $name, $code);
    }

    /* close statement */
    mysqli_stmt_close($stmt);
}

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

上例将输出：

Rockford (USA)
Tallahassee (USA)
Salinas (USA)
Santa Clarita (USA)
Springfield (USA)

add a note User Contributed Notes

php at johnbaldock dot co dot uk
24-Oct-2006 04:07


I wanted a simple way to get the equivalent of fetch_assoc when using a prepared statement. I came up with the following:



<?php

$mysqli = new mysqli($dbHost, $dbUsername, $dbPassword, $dbDatabase);

$stmt = $mysqli->prepare('select * from foobar');

$stmt->execute();

$stmt->store_result();

$meta = $stmt->result_metadata();



// the following creates a bind_result string with an argument for each column in the query

// e.g. $stmt->bind_result($results["id"], $results["foo"], $results["bar"]);

$bindResult = '$stmt->bind_result(';

while ($columnName = $meta->fetch_field()) {

    $bindResult .= '$results["'.$columnName->name.'"],';

}

$bindResult = rtrim($bindResult, ',') . ');';



// executes the bind_result string

eval($bindResult);

$stmt->fetch();



echo var_dump($results);

// outputs:

// 

// array(3) {

//   ["id"]=>

//   &int(1)

//   ["foo"]=>

//   &string(11) "This is Foo"

//   ["bar"]=>

//   &string(11) "This is Bar"

// }

?>

andrey at php dot net
28-Apr-2005 02:37


IMPORTANT note: Be careful when you use this function with big result sets or with BLOB/TEXT columns. When one or more columns are of type (MEDIUM|LONG)(BLOB|TEXT) and ::store_result() was not called mysqli_stmt_fetch() will try to allocate at least 16MB for every such column. It _doesn't_ matter that the longest value in the result set is for example 30 bytes, 16MB will be allocated. Therefore it is not the best idea ot use binding of parameters whenever fetching big data. Why? Because once the data is in the mysql result set stored in memory and then second time in the PHP variable.

add a note

mysqli_stmt_fetch

Description

返回值

参见

范例