mysqli_stmt::bind_param

mysqli_stmt_bind_param

(PHP 5, PHP 7, PHP 8)

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

说明

面向对象风格

public mysqli_stmt::bind_param(string $types, mixed &$var, mixed &...$vars): bool

过程化风格

mysqli_stmt_bind_param(
    mysqli_stmt $statement,
    string $types,
    mixed &$var,
    mixed &...$vars
): bool

Bind variables for the parameter markers in the SQL statement prepared by mysqli_prepare() or mysqli_stmt_prepare().

注意:

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.

注意:

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.

参数

statement

仅以过程化样式：由 mysqli_stmt_init() 返回的 mysqli_stmt 对象。

types

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

Type specification chars
Character Description
i corresponding variable has type int
d corresponding variable has type float
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.

返回值

成功时返回 true， 或者在失败时返回 false。

错误／异常

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.

示例

示例 #1 mysqli_stmt::bind_param() example

面向对象风格

<?php

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

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

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

$stmt->execute();

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

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

过程化风格

<?php

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

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

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

mysqli_stmt_execute($stmt);

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

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

以上示例会输出：

1 row inserted.
1 row deleted.

示例 #2 Using ... to provide arguments

The ... operator can be used to provide variable-length argument list, e.g. in a WHERE IN clause.

<?php

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

$stmt = $mysqli->prepare("SELECT Language FROM CountryLanguage WHERE CountryCode IN (?, ?)");
/* Using ... to provide arguments */
$stmt->bind_param('ss', ...['DEU', 'POL']);
$stmt->execute();
$stmt->store_result();

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

以上示例会输出：

10 rows found.

参见