mysqli_stmt::$param_count

mysqli_stmt_param_count

(PHP 5, PHP 7)

mysqli_stmt::$param_count -- mysqli_stmt_param_countReturns the number of parameter for the given statement

Descrizione

Stile orientato agli oggetti

Stile procedurale

mysqli_stmt_param_count ( mysqli_stmt $stmt ) : int

Returns the number of parameter markers present in the prepared statement.

Elenco dei parametri

stmt

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

Valori restituiti

Returns an integer representing the number of parameters.

Esempi

Example #1 Stile orientato agli oggetti

<?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();
}

if (
$stmt $mysqli->prepare("SELECT Name FROM Country WHERE Name=? OR Code=?")) {

    
$marker $stmt->param_count;
    
printf("Statement has %d markers.\n"$marker);

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

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

Example #2 Stile procedurale

<?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();
}

if (
$stmt mysqli_prepare($link"SELECT Name FROM Country WHERE Name=? OR Code=?")) {

    
$marker mysqli_stmt_param_count($stmt);
    
printf("Statement has %d markers.\n"$marker);

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

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

I precedenti esempi visualizzeranno:

Statement has 2 markers.

Vedere anche:

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User Contributed Notes 1 note

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1
Senthryl
11 years ago
This parameter (and presumably any other parameter in mysqli_stmt) will raise an error with the message "Property access is not allowed yet" if the statement was not prepared properly, or not prepared at all.

To prevent this, always ensure that the return value of the "prepare" statement is true before accessing these properties.
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