誰有原始碼，貼一下

Question

自己程式碼一直錯誤： Fatal error: Call to a member function exec() on null 

Answer 1

##class db{

private $dbConfig = [

'db' => 'mysql',

'主機' => 'localhost',

'連接埠' => '3306',

'資料庫名稱'=>  'one',

'使用者' => 'root',

'密碼' => '1234',//

'字元集' => 'utf'

];

## public $insertId = null;

# public $num = 0;

私人靜態$instance = null;

## 私人$conn = null;

私有函數 __construct($params){

$this->dbConfig = array_merge($this->dbConfig,$params);

# $this->conncet();

}

# 私人函數__clone(){

# }

公用函數getInstance(){

if(!self::$instance instanceof self){

self::$instance = new self();

}

return self::$instance;

}

public function connect(){

try{

## $dsn = " { $this->dbConfig['db']}:{$this->dbConfig['host']};

port = {$this->dbConfig['port']};

字元集= {$this->dbConfig['charset']}";

$this->conn = new pdo($dsn,$this->dbConfig['user '],$ this->dbConfig['password']);

}

catch(PDOExecption $e){

die("資料庫連線失敗". $e->getMessage ());

}

}

//完成資料表的寫入操作新增更新刪除

# //傳回出行的記錄如果新增也回傳新增主鍵id

public function exec($sql){

$num = $this->conn->exec($sql );

# / / 如果有旅行的記錄

if($num>0){

// 如果是新增操作初始化新增主鍵ID的屬性

if(null ! ==$this->conn->lastInsertId()){

$this->insertId = $this->conn->lastInsertId( );

}

$this->num = $rum;//返回旅行的記錄

}else{

$error = $this->conn->errorInfo(); //取得最後操作的錯誤訊息 【0】錯誤標識符【1】錯誤代碼【2】錯誤訊息

print '操作失敗'.$error[0].':'.$error[1 ].':'.$error[2];

}

}

## //取得單一查詢資訊

public function fetch ($sql )

{

return $this->conn->query($sql)->fetch(PDO::FETCH_ASSOC);

}

public function fetchALL($sql){

return $this->conn->query($sql)->fetch(PDO::FETCH_ASSOC );

}

}

#