Web студия "GrandView"

Description

Procedural style:

bool mysqli_stmt_store_result ( mysqli_stmt stmt )

Object oriented style (method):

class mysqli_stmt {

bool store_result ( void )

}

You must call mysqli_stmt_store_result() for every query that successfully produces a result set (SELECT, SHOW, DESCRIBE, EXPLAIN), and only if you want to buffer the complete result set by the client, so that the subsequent mysqli_stmt_fetch() call returns buffered data.

Замечание: It is unnecessary to call mysqli_stmt_store_result() for other queries, but if you do, it will not harm or cause any notable performance in all cases. You can detect whether the query produced a result set by checking if mysqli_stmt_result_metadata() returns NULL.

Примеры

Пример 1. Object oriented style


<?php

/* Open a connection */

$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 Name LIMIT 20";

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



    /* execute query */

    $stmt->execute();



    /* store result */

    $stmt->store_result();



    printf("Number of rows: %d.\n", $stmt->num_rows);



    /* free result */

    $stmt->free_result();



    /* close statement */

    $stmt->close();

}



/* close connection */

$mysqli->close();

?>

Пример 2. Procedural style


<?php

/* Open a connection */

$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 Name LIMIT 20";

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



    /* execute query */

    mysqli_stmt_execute($stmt);



    /* store result */

    mysqli_stmt_store_result($stmt);



    printf("Number of rows: %d.\n", mysqli_stmt_num_rows($stmt));



    /* free result */

    mysqli_stmt_free_result($stmt);



    /* close statement */

    mysqli_stmt_close($stmt);

}



/* close connection */

mysqli_close($link);

?>

Результат выполнения данного примера:

Number of rows: 20.

add a note User Contributed Notes
mysqli_stmt_store_result

Typer85 at gmail dot com
27-Dec-2006 03:58


In response to the note below me for the claim that mysqli_fetch_fields is not compatible with prepared statements.



This is untrue, it is but you have to do a little extra work. I would recommend you use a wrapper function of some sort to take care of the dirty business for you but the basic idea is the same.



Let's assume you have a prepared statement like so. I am going to use the procedural way for simplicity but the same idea can be done using the object oriented way:



<?php



// Connect Blah Blah Blah.



$connectionLink = mysqli_connect( .... );



// Query Blab Blah Blah.



$query = "Select `Id` From `Table` Where `Id` = ?";



// Prepare Query.



$prepareObject = mysqli_prepare( $connectionLink , $query );



// Bind Query.



mysqli_stmt_bind_param( $prepareObject , 'i' , 1 );



// Execute Query.



mysqli_stmt_execute( $prepareObject );



?>



Now all the above is fine and dandy to anyone familiar with using prepared statements, but if I want to use mysqli_fetch_fields or any other function that fetches meta information about a result set but does not work on prepared statements?



Enter the special function mysqli_stmt_result_metadata. It can be used as follows, assume the following code segment immediatley follows that of the above code segment.



<?php



$metaData = mysqli_stmt_result_metadata( $prepareObject );



// I Can Now Call mysqli_fetch_fields using the variable

// $metaData as an argument.



$fieldInfo = mysqli_fetch_fields( $metaData );



// Or Even This.



$fieldInfo = mysqli_num_fields( $metaData );



?>



Take a look at the Manual entry for mysqli_stmt_result_metatdata function for full details on how to expose it with prepared statements.



Good Luck,

UCFirefly (at) yahoo.com
20-Feb-2006 12:25


fetch_fields() does not seem to be compatible with prepared statements like those used here. Makes things difficult if you're using a wildcard. I guess that's better for security in some obscure way.



-Alex Boese

add a note

mysqli_stmt_store_result

Description

Возвращаемые значения

Смотрите также

Примеры