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mysqli_stmt::bind_param -- mysqli_stmt_bind_param — Binds variables to a prepared statement as parameters
面向对象风格
过程化风格
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
bintypesand 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.
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:
| 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.
成功时返回 true， 或者在失败时返回 false。
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));
以上例程会输出：
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());
以上例程会输出：
10 rows found.
