Php/docs/mysqli-stmt.bind-param
mysqli_stmt::bind_param
mysqli_stmt_bind_param
(PHP 5, PHP 7)
mysqli_stmt::bind_param -- mysqli_stmt_bind_param — Binds variables to a prepared statement as parameters
说明
面向对象风格
过程化风格
mysqli_stmt_bind_param
( mysqli_stmt $stmt
, string $types
, mixed &$var
, mixed &...$vars
) : bool
Bind variables for the parameter markers in the SQL statement that was passed to mysqli_prepare().
Note:
If data size of a variable exceeds max. allowed packet size (max_allowed_packet), you have to specify
b
intypes
and use mysqli_stmt_send_long_data() to send the data in packets.
Note:
Care must be taken when using mysqli_stmt_bind_param() in conjunction with call_user_func_array(). Note that mysqli_stmt_bind_param() requires parameters to be passed by reference, whereas call_user_func_array() can accept as a parameter a list of variables that can represent references or values.
参数
stmt
仅以过程化样式:由 mysqli_stmt_init() 返回的 statement 标识。
types
A string that contains one or more characters which specify the types for the corresponding bind variables:
Type specification chars Character Description i corresponding variable has type integer d corresponding variable has type double s corresponding variable has type string b corresponding variable is a blob and will be sent in packets var
vars
The number of variables and length of string
types
must match the parameters in the statement.
返回值
成功时返回 true
, 或者在失败时返回 false
。
范例
Example #1 面向对象风格
<?php$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 #2 过程化风格
<?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);?>
以上例程会输出:
1 Row inserted. 1 Row deleted.
参见
- mysqli_stmt_bind_result() - Binds variables to a prepared statement for result storage
- mysqli_stmt_execute() - Executes a prepared Query
- mysqli_stmt_fetch() - Fetch results from a prepared statement into the bound variables
- mysqli_prepare() - 准备执行一个 SQL 语句
- mysqli_stmt_send_long_data() - Send data in blocks
- mysqli_stmt_errno() - Returns the error code for the most recent statement call
- mysqli_stmt_error() - Returns a string description for last statement error