mysqli_stmt::store_result

mysqli_stmt_store_result

(PHP 5, PHP 7, PHP 8)

mysqli_stmt::store_result -- mysqli_stmt_store_result — Stores a result set in an internal buffer

Descrizione

Stile orientato agli oggetti

public mysqli_stmt::store_result(): bool

Stile procedurale

mysqli_stmt_store_result(mysqli_stmt $statement): bool

This function should be called for queries that successfully produce a result set (e.g. SELECT, SHOW, DESCRIBE, EXPLAIN) only if the complete result set needs to be buffered in PHP. Each subsequent mysqli_stmt_fetch() call will return buffered data.

Nota:
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 loss in all cases. You can detect whether the query produced a result set by checking if mysqli_stmt_result_metadata() returns false.

Elenco dei parametri

stmt: Solo nello stile procedurale: un identificatore di statement restituito da mysqli_stmt_init().

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Errori/Eccezioni

If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails, a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT, a mysqli_sql_exception is thrown instead.

Esempi

Example #1 Stile orientato agli oggetti

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
$stmt = $mysqli->prepare($query);
$stmt->execute();

/* store the result in an internal buffer */
$stmt->store_result();

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

Example #2 Stile procedurale

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

$query = "SELECT Name, CountryCode FROM City ORDER BY Name LIMIT 20";
$stmt = mysqli_prepare($link, $query);
mysqli_stmt_execute($stmt);

/* store the result in an internal buffer */
mysqli_stmt_store_result($stmt);

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

I precedenti esempi visualizzeranno:

Number of rows: 20.

Vedere anche:

mysqli_prepare() - Prepares an SQL statement for execution
mysqli_stmt_result_metadata() - Returns result set metadata from a prepared statement
mysqli_stmt_fetch() - Fetch results from a prepared statement into the bound variables

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User Contributed Notes 5 notes

down

kitlum AT ukr DOT net ¶

9 years ago

Lost some hours to find out how to save multirows result of mysqli_stmt to array, when get_result prohibited.
Idea, which works is using store_result
            $stmt=$this->mysqli->prepare("SELECT surname, name, user_id, last_m_own, last_m_str, role FROM users WHERE referer_id=(?)");
                $stmt->bind_param('i',$referer_id);
                $stmt->execute();
                $stmt->store_result();
                $stmt->bind_result($ans['surname'], $ans['name'], $ans['user_id'], $ans['last_m_own'], $ans['last_m_str'], $ans['role']);
                $j=$stmt->num_rows;
                for ($i=0;$i<$j;$i++){
                    $stmt->data_seek($i);
                    $stmt->fetch();
                    foreach ($ans as $key=>$value){
                        $result[$i][$key]=$value;
                    }
                }
Hope will helpful for such newbies as me

down

pcc at pccglobal dot com ¶

14 years ago

When using prepare to prepare a statement to retrieve LOBs the method order matters.

Also, method 'store_result()' must be called and be called in correct order.

Failure to observe this causes PHP/MySQLi to crash or return an erroneous value.

The proper procedure order is: prepare -> execute -> store_result -> bind -> fetch

The following applies to a Windows SBS server running IIS/6.0 + PHP 5.2.1

MySQL server version 5.0.26-community-nt, client version 5.0.51a



<?php

$database = "test" ;

$table = "test" ;

$column = "flongblob" ;

$mysqli = new mysqli("localhost", "root", "<secret_password>", $database);

// Proper procedure order: prepare -> execute -> store_result -> bind -> fetch

$stmt = $mysqli->prepare("SELECT `$column` FROM `$table`") ;

$stmt->execute();

$stmt->store_result(); 

// Fetch a record. Bind the result to a variable called 'value' and fetch.

$stmt->bind_result($value) ;

$res = $stmt->fetch() ;

if($res)

{

  // strlen($value) should have LOB length, not 1 or zero.

  echo "$column data length is " . strlen($value) . " bytes.\n" ;

}

else

{

  echo ((false !== $res) ? "End of data" : $stmt->error) . "\n" ;

  break ;

}

// Fetch another record.

$res = $stmt->fetch() ;

if($res)

{

  // strlen($value) should have LOB length, not 1 or zero.

  echo "$column data length is " . strlen($value) . " bytes.\n" ;

}

else

{

  echo ((false !== $res) ? "End of data" : $stmt->error) . "\n" ;

  break ;

}

$stmt->close() ;

$mysqli->close() ;

exit ;

?>



The above example should output:

  flongblob data length is 932353 bytes.

  flongblob data length is 867300 bytes.



If wrong procedure order MySQLi crashes or outputs:

  flongblob data length is 0 bytes.

  flongblob data length is 867300 bytes.

down

neromir at hotmail dot com ¶

16 years ago

The wording above, in the initial description of the function, can be confusing (quoted below).  

"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. "

I had initially understood the part saying "and only if you want to buffer..." to mean that it was only necessary to call this function if you wanted to buffer the result set.  This, however, is not the case, and the misunderstanding caused me quite a bit of grief.  

So, to clarify for anyone suffering from the same misunderstanding, you ALWAYS must call this function for every query that produces a result set (as listed in the parentheses of the quote above), as far as I can tell.

down

UCFirefly (at) yahoo.com ¶

18 years ago

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.

down

Typer85 at gmail dot com ¶

17 years ago

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,

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