PHP mysqli use_result() 函数

示例 - 面向对象风格

启动从上次执行的查询中检索结果集：

<?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();
}

$sql = "SELECT Lastname FROM Persons ORDER BY LastName;";
$sql .= "SELECT Country FROM Customers";

// Execute multi query
if ($mysqli -> multi_query($sql)) {
do {
    // Store first result set
    if ($result = $mysqli -> use_result()) {
      while ($row = $result -> fetch_row()) {
        printf("%s\n", $row[0]);
      }
     $result -> close();
    }
    // if there are more result-sets, the print a divider
    if ($mysqli -> more_results()) {
      printf("-------------\n");
    }
     //Prepare next result set
  } while ($mysqli -> next_result());
}

$mysqli -> close();
?>

查看底部的程序样式示例。

定义和用法

use_result() / mysqli_use_result() 函数启动从上次执行的查询中检索结果集。

语法

面向对象风格：

$mysqli -> use_result()

程序风格：

mysqli_use_result( connection)

参数值

Parameter	Description
connection	Required. Specifies the MySQL connection to use

技术细节

返回值：	返回一个未缓冲的结果对象。错误时为 FALSE
PHP 版本：	5+

示例 - 程序风格

启动从上次执行的查询中检索结果集：

<?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();
}

$sql = "SELECT Lastname FROM Persons ORDER BY LastName;";
$sql .= "SELECT Country FROM Customers";

// Execute multi query
if (mysqli_multi_query($con, $sql)) {
do {
    // Store first result set
    if ($result = mysqli_use_result($con)) {
      while ($row = mysqli_fetch_row($result)) {
        printf("%s\n", $row[0]);
      }
      mysqli_free_result($result);
    }
    // if there are more result-sets, the print a divider
    if (mysqli_more_results($con)) {
      printf("-------------\n");
    }
     //Prepare next result set
  } while (mysqli_next_result($con));
}

mysqli_close($con);
?>

❮ PHP MySQLi 参考