Php PDO连接未按要求工作
嗨,我正在使用PDO DB类连接到数据库。但我真的不知道我做得对不对。所有连接设置都正常,但运行查询时出现错误 我的目录结构是Php PDO连接未按要求工作,php,mysql,pdo,Php,Mysql,Pdo,嗨,我正在使用PDO DB类连接到数据库。但我真的不知道我做得对不对。所有连接设置都正常,但运行查询时出现错误 我的目录结构是 /root /dbops <-- Directory contains `config.php` --> /dbfunctions <-- Directory contains `DBclass.php` & `DBFuncts.php` --> DBclass.php包含: class dbdunctions__DBclass
/root
/dbops <-- Directory contains `config.php` -->
/dbfunctions <-- Directory contains `DBclass.php` & `DBFuncts.php` -->
DBclass.php
包含:
class dbdunctions__DBclass{
public $instance = null;
public function __construct() {}
final private function __clone() {}
public static function instance()
{
if (self::$instance === null)
{
$opt = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
PDO::ATTR_EMULATE_PREPARES => TRUE,
PDO::ATTR_STATEMENT_CLASS => array('myPDOStatement'),
);
$dsn = 'mysql:host='.DB_HOST.';dbname='.DB_NAME.';
charset='.DB_CHAR;
self::$instance = new PDO($dsn, DB_USERNAME, DB_PASSWORD,
$opt);
}
return self::$instance;
}
public static function __callStatic($method, $args) {
return call_user_func_array(array(self::instance(), $method), $args);
}
}
class myPDOStatement extends PDOStatement
{
function execute($data = array())
{
parent::execute($data);
return $this;
}
}
DBFuncts.php
包含以下内容:
class dbfunctions__DBFuncts
{
protected $_con;
public function __construct()
{
$db = new dbfunctions__DBclass();
$this->_con = $db->con;
}
function gotodb(array $data){
$result =
$this->_con::instance()->prepare($qry)->execute(array(/*parameters*/));
}
}
现在,当使用$result
触发查询时,我得到以下错误
分析错误:语法错误,第12行dbops/dbfunctions/DBFuncts.php中出现意外的“::”(T_PAAMAYIM_NEKUDOTAYIM)
请导游。我已经花了2个小时在这个问题上,在谷歌上搜索了一下。而不是
$this->_con::instance()
你应该能够做到这一点
$this->_con->instance()->prepare($qry)->execute(array(/*parameters*/));
我不确定当你把代码放进去的时候它是否是一个打字错误,但是我注意到在DBclass.php中你有类dbduntions\uuu DBclass,当然这应该是类dbfunctions\uu DBclass()
另外,您的示例代码中似乎还有一些其他错误。。。但让我们一次解决一个问题:)试着这样调整。我已经在我的服务器上进行了一些调整。值得注意的是,在
dbduntions\uu DBclass()
类的\uu构造()
中实例化连接,并将$this->\u con
分配给self::$instance
(dbduntions\uu DBclass:$instance;
):
PDO对象被创建,然后成为“成员对象”。gotodb对象使用“成员对象”PDO实例。下面是我正在工作的一个站点的代码示例,它应该有助于更好地解释它:
try {
$sql="
SELECT
id
, name
, description
FROM
ue_bug_project
";
// $stmt objected created by preparing the SQL query for execution, using the PDO object, which in this case is $this->db
$stmt = $this->db->prepare($sql);
// The execute method of the $stmt object is run executing the query, in this case no query data is bound as there is no user submitted data being used
$stmt->execute();
// The result set is grabbed in one hit and placed into the projects array (I really should have set up the $projects variable as an empty array beforehand)
$projects = $stmt->fetchAll(PDO::FETCH_ASSOC);
return $projects;
}
// If the query fails with an error, the catch block is run, in this case i log the error.
catch (PDOException $e) {
error_log('Error when getting the list of projects!');
error_log(' Query with error: '.$sql);
error_log(' Reason given:'.$e->getMessage()."\n");
return false;
}
}
从代码的外观来看,可能没有必要在PDO类周围放置自己的包装器我想到了这一点,并改为现在的错误是
致命错误:对非对象调用成员函数实例()
$this->\u con=$db->con;尝试在DBFuncts.phpNow中设置$this->\u con=$db它是致命错误:访问未声明的静态属性:Clws\uu DBclass::$instance
。。我在上面胡闹了2-3个小时:(但当我使用insert查询时,这种方法会失败…为什么?什么会失败?我认为有两个函数可以完成任务..一个是insert,另一个是select哦,是的,您需要创建一个select和insert函数,但连接应该可以正常工作,因为insert语句将始终返回0。这会对未定义的方法dbfunction进行错误调用。)s_uudbclass::prepare()@Cristian Bitoi…你能看到这个错误吗?它怎么可能是重复的。我的问题是完全不同的。为什么你要在PDO周围放置一个包装器?当我简单地包含这个文件时,这个PDO可以工作,但是当我尝试通过类时,我会面临问题。所以围绕PDO的包装器没有给出问题。如果你知道sol,请告诉我
class dbdunctions__DBclass
{
// Make the instance static
public static $instance = null;
public function __construct()
{
// Create the static connection in the construct
$this->init();
}
private function init()
{
if (self::$instance === null) {
$opt = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
PDO::ATTR_EMULATE_PREPARES => TRUE,
PDO::ATTR_STATEMENT_CLASS => array('myPDOStatement'),
);
self::$instance = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME.'; charset='.DB_CHAR, DB_USERNAME, DB_PASSWORD, $opt);
}
}
final private function __clone()
{
}
public static function __callStatic($method, $args)
{
return call_user_func_array(array(self::instance(), $method), $args);
}
}
class myPDOStatement extends PDOStatement
{
public function execute($data = array())
{
parent::execute($data);
return $this;
}
}
class dbfunctions__DBFuncts
{
protected $_con;
public function __construct()
{
// Create instance of database
$database = new dbdunctions__DBclass();
// Assign the connection to the $this->_con
$this->_con = dbdunctions__DBclass::$instance;
}
public function gotodb($statement = false,$bind = false)
{
// Incase the statement or bind is empty, return 0
if(empty($statement) || empty($bind))
return 0;
// Create the query with method chain
$query = $this ->_con->prepare($statement)
->execute($bind);
// Fetch results
while($row = $query->fetch())
$result[] = $row;
// If results return array else return 0 for consistency
return (!empty($result))? $result : 0;
}
}
// Instantiate
$dbFunc = new dbfunctions__DBFuncts();
// Use whatever you use to return a result here. This statement happens
// to work for my database...but likely not yours
print_r($dbFunc->gotodb("select * from `users` where `ID` = :ID",array(":ID"=>"29")));
class dbfunctions__DBFuncts
{
protected $_con;
public function __construct()
{
$db = new dbfunctions__DBclass();
$this->db = $db;
}
function gotodb(array $data){
$result =
$stmt = $this->db->prepare($qry);
$stmt->execute(array(/*parameters*/));
}
try {
$sql="
SELECT
id
, name
, description
FROM
ue_bug_project
";
// $stmt objected created by preparing the SQL query for execution, using the PDO object, which in this case is $this->db
$stmt = $this->db->prepare($sql);
// The execute method of the $stmt object is run executing the query, in this case no query data is bound as there is no user submitted data being used
$stmt->execute();
// The result set is grabbed in one hit and placed into the projects array (I really should have set up the $projects variable as an empty array beforehand)
$projects = $stmt->fetchAll(PDO::FETCH_ASSOC);
return $projects;
}
// If the query fails with an error, the catch block is run, in this case i log the error.
catch (PDOException $e) {
error_log('Error when getting the list of projects!');
error_log(' Query with error: '.$sql);
error_log(' Reason given:'.$e->getMessage()."\n");
return false;
}
}