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mysqli_stmt::$param_count

mysqli_stmt_param_count

(PHP 5)

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

Descrierea

Stil obiect-orientat

Stil procedural

int mysqli_stmt_param_count ( mysqli_stmt $stmt )

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

Parametri

stmt

Numai stilul procedural: Un identificator al declarației întors de mysqli_stmt_init().

Valorile întoarse

Returns an integer representing the number of parameters.

Exemple

Example #1 Stil obiect-orientat

<?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 Stil procedural

<?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);
?>

Exemplele de mai sus vor afișa:

Statement has 2 markers.

Vedeți de asemenea

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User Contributed Notes 1 note

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Senthryl
5 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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