3.9.4 mysqli_stmt::bind_param, mysqli_stmt_bind

3.9.4 `mysqli_stmt::bind_param`, `mysqli_stmt_bind_param`

mysqli_stmt::bind_param
mysqli_stmt_bind_param
Binds variables to a prepared statement as parameters

Description

Object oriented style

public bool mysqli_stmt::bind_param(string types,
                                    mixed var,
                                    mixed vars);

Procedural style

bool mysqli_stmt_bind_param(mysqli_stmt stmt,
                            string types,
                            mixed var,
                            mixed vars);

Bind variables for the parameter markers in the SQL statement that was passed to mysqli_prepare.

Note

If data size of a variable exceeds max. allowed packet size (max_allowed_packet), you have to specify b in types and use mysqli_stmt_send_long_data to send the data in packets.

Note

Care must be taken when using mysqli_stmt_bind_param in conjunction with call_user_func_array. Note that mysqli_stmt_bind_param requires parameters to be passed by reference, whereas call_user_func_array can accept as a parameter a list of variables that can represent references or values.

Parameters

stmt

Procedural style only: A statement identifier returned by mysqli_stmt_init.

types

A string that contains one or more characters which specify the types for the corresponding bind variables:

Table 3.14 Type specification chars

Character	Description
i	corresponding variable has type integer
d	corresponding variable has type double
s	corresponding variable has type string
b	corresponding variable is a blob and will be sent in packets

var , vars

The number of variables and length of string types must match the parameters in the statement.

Return Values

Returns true on success or false on failure.

Examples

Example 3.72 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();
}

$stmt = $mysqli->prepare("INSERT INTO CountryLanguage VALUES (?, ?, ?, ?)");
$stmt->bind_param('sssd', $code, $language, $official, $percent);

$code = 'DEU';
$language = 'Bavarian';
$official = "F";
$percent = 11.2;

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

printf("%d Row inserted.\n", $stmt->affected_rows);

/* close statement and connection */
$stmt->close();

/* Clean up table CountryLanguage */
$mysqli->query("DELETE FROM CountryLanguage WHERE Language='Bavarian'");
printf("%d Row deleted.\n", $mysqli->affected_rows);

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

Example 3.73 Procedural style

<?php
$link = mysqli_connect('localhost', 'my_user', 'my_password', 'world');

/* check connection */
if (!$link) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$stmt = mysqli_prepare($link, "INSERT INTO CountryLanguage VALUES (?, ?, ?, ?)");
mysqli_stmt_bind_param($stmt, 'sssd', $code, $language, $official, $percent);

$code = 'DEU';
$language = 'Bavarian';
$official = "F";
$percent = 11.2;

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

printf("%d Row inserted.\n", mysqli_stmt_affected_rows($stmt));

/* close statement and connection */
mysqli_stmt_close($stmt);

/* Clean up table CountryLanguage */
mysqli_query($link, "DELETE FROM CountryLanguage WHERE Language='Bavarian'");
printf("%d Row deleted.\n", mysqli_affected_rows($link));

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

The above examples will output:

1 Row inserted.
1 Row deleted.