PHP mysqli_stmt free_result()方法

 PHP MySQLi 函数

PHP mysqli_stmt::free_result() / mysqli_stmt_free_result() 函数用于释放与语句，由 mysqli_stmt_store_result() 分配。

语法

//面向对象风格
public mysqli_stmt::free_result()

//面向过程风格
mysqli_stmt_free_result(statement)

参数

返回值

没有值

示例:面向对象风格

下面的示例展示了mysqli_stmt::free_result()方法的用法。

<?php
//建立与数据库的连接
$mysqli = new mysqli("localhost", "user", "password", "database");
if ($mysqli->connect_errno) {
  echo "Failed to connect to MySQL: ". $mysqli->connect_error;
  exit();
}

//准备执行SQL语句
$query = "SELECT EmpID, Name, Age FROM Employee ORDER BY Age";
$stmt = $mysqli->prepare($query);

//执行SQL语句
$stmt->execute();

//将结果存储在内部缓冲区中
$stmt->store_result();

//获取语句中缓冲的行数
printf("Number of rows: %d \n", $stmt->num_rows);

//释放结果集内存
$stmt->free_result();

//结束语句
$stmt->close();

//关闭连接
$mysqli->close();
?>

上述代码的输出将类似于:

Number of rows: 58

示例:面向过程风格

下面的示例显示mysqli_stmt_free_result()的用法 函数。

<?php
//建立与数据库的连接
$mysqli = mysqli_connect("localhost", "user", "password", "database");
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: ". mysqli_connect_error();
  exit();
}

//准备执行SQL语句
$query = "SELECT EmpID, Name, Age FROM Employee ORDER BY Age";
$stmt = mysqli_prepare($mysqli, $query);

//执行SQL语句
mysqli_stmt_execute($stmt);

//将结果存储在内部缓冲区中
mysqli_stmt_store_result($stmt);

//获取语句中缓冲的行数
printf("Number of rows: %d \n", mysqli_stmt_num_rows($stmt));

//释放结果集内存
mysqli_stmt_free_result($stmt);

//结束语句
mysqli_stmt_close($stmt);

//关闭连接
mysqli_close($mysqli);
?>

上述代码的输出将类似于:

Number of rows: 58