无法在非对象MySQLI上调用成员函数查询

时间:2013-01-11 01:04:12

标签: php mysqli

我在使用MySQLI代码生成注册时遇到问题。表/连接变量匹配,并且通过查询传递的正确变量填充了预期的字符串,在执行任何类型的查询时运行queryprepare & execute时,我会返回以下:

  

致命错误:在非对象中调用成员函数query()   第40行/var/www/New/API/FormValidations.php

我的代码如下:

$Query = $STD->prepare("SELECT * FROM Users WHERE Username='$Username'");
$Query->execute();
$Number = $Query->num_rows;
if ($Number !== 0)
{
    echo "Username Already In Use";
}
else
{
$Insert_User = $STD->prepare("INSERT INTO Users ('Username', 'Password') VALUES ('$Username', '$Password)");
$Insert_User->execute();
echo "Account Created!";
}

这是我的连接脚本:

$STD = new mysqli('localhost', 'root', 'xxxxx', 'SLMS');
$AccessCon = new mysqli('localhost', 'root', 'xxxxx', 'DBAccess');

if ($AccessCon->connect_error) {
    die("Access Has Been Revoked. Please Contact Administration");
}

if ($STD->connect_error) {
    die("Standard Access Has Been Revoked. Please Contact Administration"); 
}

和我的用户SQL表:

CREATE TABLE IF NOT EXISTS `Users` (
  `ID` int(255) NOT NULL AUTO_INCREMENT,
  `Username` varchar(255) NOT NULL,
  `Password` text NOT NULL,
  PRIMARY KEY (`ID`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ;

我试过评论我的所有查询代码,然后运行

$Query = $STD->query("SHOW TABLES"); $Results = $STD->fetch_array(MYSQLI_ASSOC);

这仍然会在我的$Query变量上返回错误。

我还尝试修改我的代码以搜索数据库中已存在的内容:

$Query = $STD->prepare("SELECT * FROM Users WHERE Username='Test'");

并尝试将我的$Username括起来:

$Query = $STD->prepare("SELECT * FROM Users WHERE Username='{$Username}'");

这已经取得了成功。我想知道是否有人可以对这种情况有所了解?

修改

评论整个脚本并运行:

$Query = $STD->query("SHOW TABLES");
$test = $Query->fetch_array(MYSQLI_ASSOC);
print_r($test);

返回结果。

更新

我已将代码修改为:

$Query = $STD->prepare("SELECT * FROM Users WHERE Username=?");
                $Query->bind_param("s", $Username);
                $Query->execute();

最终更新:

  

致命错误:在非对象上调用成员函数bind_param()   在第45行的/var/www/New/Register.php中

这是新错误。

违规行:

            $Insert_User = $STD->prepare("INSERT INTO Users ('Username', 'Password') VALUES (?, ?)");
                $Insert_User->bind_param("ss", $Username, $Password);
            $Insert_User->execute();

1 个答案:

答案 0 :(得分:1)

使用prepare时,您必须绑定包含值的变量。

示例:

 $city = "Amersfoort";

/* create a prepared statement */
if ($stmt = $mysqli->prepare("SELECT District FROM City WHERE Name=?")) {

    /* bind parameters for markers */
    $stmt->bind_param("s", $city);

    /* execute query */
    $stmt->execute();

    /* bind result variables */
    $stmt->bind_result($district);

    /* fetch value */
    $stmt->fetch();

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

    /* close statement */
    $stmt->close();
}

此处链接指向prepared statements

<强>更新

这样:

$Query = $STD->prepare("SELECT * FROM Users WHERE Username=s");

应该是:

$Query = $STD->prepare("SELECT * FROM Users WHERE Username=?");

这样:

$Insert_User = $STD->prepare("INSERT INTO Users ('Username', 'Password') VALUES ('U', 'P)");

应该是:

$Insert_User = $STD->prepare("INSERT INTO Users ('Username', 'Password') VALUES (?, ?)");

这个:

$Insert_User->bind_param('U', $Username);
$Insert_User->bind_param('P', $Password);

应该是这样的:

$Insert_User->bind_param('ss', $Username,$Password);