PHP mysqli stmt_init() 函数

定义和用法

stmt_init() / mysqli_stmt_init() 函数初始化语句并返回适合 mysqli_stmt_prepare() 使用的对象。

实例

例子 1 - 面向对象风格

初始化一个语句并返回一个用于 stmt_prepare() 的对象：

<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");

if ($mysqli -> connect_errno) {
  echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
  exit();
}

$city="Sandnes";

// 创建一个预处理语句
$stmt = $mysqli -> stmt_init();

if ($stmt -> prepare("SELECT District FROM City WHERE Name=?")) {
  // 绑定参数
  $stmt -> bind_param("s", $city);

  // 执行查询
  $stmt -> execute();

  // 绑定结果变量
  $stmt -> bind_result($district);

  // 获取值
  $stmt -> fetch();

  printf("%s is in district %s", $city, $district);

  // 关闭语句
  $stmt -> close();
}

$mysqli -> close();
?>

例子 2 - 过程式风格

初始化一个语句并返回一个用于 mysqli_stmt_prepare() 的对象：

<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");

if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  exit;
}

$city="Sandnes";

// 创建一个预处理语句
$stmt = mysqli_stmt_init($con);

if (mysqli_stmt_prepare($stmt, "SELECT District FROM City WHERE Name=?")) {
  // 绑定参数
  mysqli_stmt_bind_param($stmt, "s", $city);

  // 执行查询
  mysqli_stmt_execute($stmt);

  // 绑定结果变量
  mysqli_stmt_bind_result($stmt, $district);

  // 获取值
  mysqli_stmt_fetch($stmt);

  printf("%s is in district %s", $city, $district);

  // 关闭语句
  mysqli_stmt_close($stmt);
}

mysqli_close($con);
?>

语法

面向对象风格：

$mysqli -> stmt_init()

过程式风格：

mysqli_stmt_init(connection)

技术细节