php - 无法使用 mysql_query() 执行查询

Question

我无法执行查询

if (!mysql_query("SELECT `title`,LEFT(`description`,70) as `description`,`url`
                  FROM `articles` 
                  WHERE `keywords` LIKE '%blog%'"))
{
    echo 'Failed';
}

如果我将相同的查询直接复制并运行到本地主机的 SQL 菜单中，它会成功运行。

Answer 1

为什么不用这个

$sql = mysql_query("SELECT `title`,LEFT(`description`,70) as `description`,`url`
              FROM `articles` 
              WHERE `keywords` LIKE '%blog%'") or die (mysql_error());
                                                      //^^^^^^^^^^^^^^^---better use this instead of "failed" to debug, if want change it do it like that **or die ('failed');**

它像 if 一样工作，它会被这样解释:

execute my query please or if its not true my query please die and echo the error.

---

This cant be used in production but only during development for not passing technical error messages to the user, can give them important hints on detecting and/or exploiting vulnerabilities