我写了一个类Database.php:
class Database
{
private $host;
private $dbUsername;
private $dbPassword;
private $connection;
private $iv;
public function __construct($host, $dbUsername, $dbPassword, $iv)
{
$this->dbPassword = $dbPassword;
$this->dbUsername = $dbUsername;
$this->host = $host;
$this->iv = $iv;
}
public function createDatabase($dbName){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword);
$query = "CREATE DATABASE IF NOT EXISTS $dbName";
if(!$this->connection){
var_dump("Connection failed");
}
else {
$this->connection->prepare($query)->execute();
}
$this->connection->close();
}
public function createTable($query, $dbName){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword, $dbName);
if(!$this->connection){
var_dump("Connection failed");
}
else {
$this->connection->prepare($query)->execute();
}
$this->connection->close();
}
public function getConnection(){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword);
return $this->connection;
}
public function executeQuery($dbname, $query){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword, $dbname);
if(!$this->connection){
var_dump("Connection failed");
return false;
}
else{
$this->connection->prepare($query)->execute();
$this->connection->close();
return true;
}
}
public function deleteFromTable($dbname, $query){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword, $dbname);
if(!$this->connection){
var_dump("Connection failed");
return false;
}
else{
$this->connection->prepare($query)->execute();
$this->connection->close();
return true;
}
}
public function check($query){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword, "portal");;
$statement = $this->connection->prepare($query);
$statement->execute();
$statement->store_result();
if($statement->num_rows != 0){
$this->connection->close();
return true;
}
else
{
$this->connection->close();
return false;
}
}
public function getId($username){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword, 'portal');
$id = mysqli_fetch_all(mysqli_query($this->connection, "SELECT id FROM users WHERE username='$username'"));
$this->connection->close();
return $id[0][0];
}
public function getData($query, $name = null){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword, 'portal');
$statement = $this->connection->prepare($query);
$statement->execute();
$data = $statement->get_result()->fetch_array();
if($name != null) {
return $data[$name];
}
else{
return $data;
}
}
public function getDataAsArray($myQuery){
$this->connection = mysqli_connect($this->host, $this->dbUsername, $this->dbPassword, 'portal');
$query = mysqli_query($this->connection, $myQuery);
$results = array();
while($line = mysqli_fetch_array($query)){
$results[] = $line;
}
return $results;
}
public function encryptSSL($data){
$encryptionMethod = "AES-256-CBC";
$secretHash = "";
$encryptedMessage = openssl_encrypt($data, $encryptionMethod, $secretHash, 0, $this->iv);
return $encryptedMessage . '||' . $this->iv;
}
public function decryptSSL($data, $iv){
$encryptionMethod = "AES-256-CBC";
$secretHash = "";
$decryptedMessage = openssl_decrypt($data, $encryptionMethod, $secretHash, 0, $iv);
return $decryptedMessage;
}
}
我在我的代码中使用它作为以下选项,更新,删除数据库中的条目:
$customerInfo = $database->getData("SELECT * FROM customers WHERE id='$id'");
$database->executeQuery('portal', "INSERT into messages (userId, message, customerId, messageRead, messageTrash, messageDeleted, time_added, subject) VALUES(
'$id', '$message', '$customerId', 0, 0, 0, '$time_date', '$messageSubject')");
但是很多人都知道这对于SQL注入是不安全的。像:ID
这样的绑定参数是可能的,但我不知道如何在课堂上做到这一点。如果我想要一个函数但是有多个不同的查询,例如:一个查询带有一个变量,或者一个查询有多个变量,如上面两个查询,该怎么办
任何人都可以帮我解决这个问题吗?
答案 0 :(得分:1)
在没有首先转义/处理它们的情况下直接在查询中使用变量绝不是一个好主意。但是,如果你这样做,使用php的'bif'mysqli_real_escape_string($ var)来逃避它们。
在您的代码中,您可以执行以下操作:
$customerInfo = $database->getData(sprintf("SELECT * FROM customers WHERE id='%d'", mysqli_real_escape_string($id)));
$database->executeQuery('portal', sprintf("INSERT into messages (userId, message, customerId, messageRead, messageTrash, messageDeleted, time_added, subject) VALUES('%d', '%s', '%s', 0, 0, 0, '%s', '%s')", mysqli_real_escape_string($id), mysqli_real_escape_string($message), mysqli_real_escape_string($customerId), mysqli_real_escape_string($time_date), mysqli_real_escape_string($messageSubject)));
以下是使用strtr执行此操作的另一种方法:
$placeholders = array(
':id' => mysqli_real_escape_string($id),
':message' => mysqli_real_escape_string($message),
':customerId' => mysqli_real_escape_string($customerId),
':time_date' => mysqli_real_escape_string($time_date),
':messageSubject' => mysqli_real_escape_string($messageSubject),
);
$database->executeQuery('portal', strtr("INSERT into messages (userId, message, customerId, messageRead, messageTrash, messageDeleted, time_added, subject) VALUES(':id', ':message', ':customerId', 0, 0, 0, ':time_date', ':messageSubject')", $placeholders));