How to do queries with pdo db connection function?









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I read too many questions and answers around but couldn't be sure.
I have 2 questions




1.I turned my db connection into a function and I am not sure if its
safe ?




define('DB_SERVER', 'localhost'); 
define('DB_USERNAME', 'root');
define('DB_PASSWORD', '');
define('DB_NAME', 'demo');

function DB()

try
$pdo = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
return $pdo;
catch (PDOException $e)
return "Error!: " . $e->getMessage();
die();





2.is my query done right way ?




query:



try 
$pdo = DB();
$stmt = $pdo->prepare("SELECT * FROM settings");
$stmt->execute();
while($row = $stmt->fetch(PDO::FETCH_ASSOC))
$c = htmlspecialchars($row['site_url']);
$e = filterString($row['contact']);

unset($stmt);
catch (PDOException $e)
exit($e->getMessage());



Thanks for any help










share|improve this question

























    up vote
    0
    down vote

    favorite












    I read too many questions and answers around but couldn't be sure.
    I have 2 questions




    1.I turned my db connection into a function and I am not sure if its
    safe ?




    define('DB_SERVER', 'localhost'); 
    define('DB_USERNAME', 'root');
    define('DB_PASSWORD', '');
    define('DB_NAME', 'demo');

    function DB()

    try
    $pdo = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    return $pdo;
    catch (PDOException $e)
    return "Error!: " . $e->getMessage();
    die();





    2.is my query done right way ?




    query:



    try 
    $pdo = DB();
    $stmt = $pdo->prepare("SELECT * FROM settings");
    $stmt->execute();
    while($row = $stmt->fetch(PDO::FETCH_ASSOC))
    $c = htmlspecialchars($row['site_url']);
    $e = filterString($row['contact']);

    unset($stmt);
    catch (PDOException $e)
    exit($e->getMessage());



    Thanks for any help










    share|improve this question























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I read too many questions and answers around but couldn't be sure.
      I have 2 questions




      1.I turned my db connection into a function and I am not sure if its
      safe ?




      define('DB_SERVER', 'localhost'); 
      define('DB_USERNAME', 'root');
      define('DB_PASSWORD', '');
      define('DB_NAME', 'demo');

      function DB()

      try
      $pdo = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD);
      $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
      return $pdo;
      catch (PDOException $e)
      return "Error!: " . $e->getMessage();
      die();





      2.is my query done right way ?




      query:



      try 
      $pdo = DB();
      $stmt = $pdo->prepare("SELECT * FROM settings");
      $stmt->execute();
      while($row = $stmt->fetch(PDO::FETCH_ASSOC))
      $c = htmlspecialchars($row['site_url']);
      $e = filterString($row['contact']);

      unset($stmt);
      catch (PDOException $e)
      exit($e->getMessage());



      Thanks for any help










      share|improve this question













      I read too many questions and answers around but couldn't be sure.
      I have 2 questions




      1.I turned my db connection into a function and I am not sure if its
      safe ?




      define('DB_SERVER', 'localhost'); 
      define('DB_USERNAME', 'root');
      define('DB_PASSWORD', '');
      define('DB_NAME', 'demo');

      function DB()

      try
      $pdo = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD);
      $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
      return $pdo;
      catch (PDOException $e)
      return "Error!: " . $e->getMessage();
      die();





      2.is my query done right way ?




      query:



      try 
      $pdo = DB();
      $stmt = $pdo->prepare("SELECT * FROM settings");
      $stmt->execute();
      while($row = $stmt->fetch(PDO::FETCH_ASSOC))
      $c = htmlspecialchars($row['site_url']);
      $e = filterString($row['contact']);

      unset($stmt);
      catch (PDOException $e)
      exit($e->getMessage());



      Thanks for any help







      mysqli pdo php-7






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 11 at 11:45









      kader kandar

      106




      106






















          1 Answer
          1






          active

          oldest

          votes

















          up vote
          0
          down vote



          accepted










          Perhaps keep one connection, rather than opening multiple connections to the Database. You can look into a project PDOEasy that I created to make MVC easy with PDO or use the below static example.



          class DB

          private $_connection;
          private static $_instance;

          public static function getInstance()
          if(self::$_instance) return self::$_instance;
          self::$_instance = new self();
          return self::$_instance;


          private function __construct()
          $this->_connection = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD, array(
          PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
          PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
          PDO::ATTR_EMULATE_PREPARES => false
          ));


          public function getConnection() return $this->_connection;



          Which can be used like so:



          $stmt = DB::getInstance()
          ->getConnection()
          ->Prepare('SELECT * FROM settings');

          $stmt->execute();
          foreach($stmt->fetchAll() as $row)
          // ...






          share|improve this answer




















          • Looks good but how to make functions work ? example fucntion function catplace($par) Global $pdo; $stmt = $pdo->prepare("SELECT * FROM categories WHERE place=:par ORDER BY created ASC"); $stmt->execute(array(':par'=>$par)); $b = $stmt->fetchAll(PDO::FETCH_ASSOC); return $b;
            – kader kandar
            Nov 11 at 14:53










          • You can use it like so with PDOEasy.
            – Jaquarh
            Nov 11 at 14:59






          • 1




            woohoo thanks alot I got it wil use your class thanks again
            – kader kandar
            Nov 11 at 15:00










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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes








          up vote
          0
          down vote



          accepted










          Perhaps keep one connection, rather than opening multiple connections to the Database. You can look into a project PDOEasy that I created to make MVC easy with PDO or use the below static example.



          class DB

          private $_connection;
          private static $_instance;

          public static function getInstance()
          if(self::$_instance) return self::$_instance;
          self::$_instance = new self();
          return self::$_instance;


          private function __construct()
          $this->_connection = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD, array(
          PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
          PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
          PDO::ATTR_EMULATE_PREPARES => false
          ));


          public function getConnection() return $this->_connection;



          Which can be used like so:



          $stmt = DB::getInstance()
          ->getConnection()
          ->Prepare('SELECT * FROM settings');

          $stmt->execute();
          foreach($stmt->fetchAll() as $row)
          // ...






          share|improve this answer




















          • Looks good but how to make functions work ? example fucntion function catplace($par) Global $pdo; $stmt = $pdo->prepare("SELECT * FROM categories WHERE place=:par ORDER BY created ASC"); $stmt->execute(array(':par'=>$par)); $b = $stmt->fetchAll(PDO::FETCH_ASSOC); return $b;
            – kader kandar
            Nov 11 at 14:53










          • You can use it like so with PDOEasy.
            – Jaquarh
            Nov 11 at 14:59






          • 1




            woohoo thanks alot I got it wil use your class thanks again
            – kader kandar
            Nov 11 at 15:00














          up vote
          0
          down vote



          accepted










          Perhaps keep one connection, rather than opening multiple connections to the Database. You can look into a project PDOEasy that I created to make MVC easy with PDO or use the below static example.



          class DB

          private $_connection;
          private static $_instance;

          public static function getInstance()
          if(self::$_instance) return self::$_instance;
          self::$_instance = new self();
          return self::$_instance;


          private function __construct()
          $this->_connection = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD, array(
          PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
          PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
          PDO::ATTR_EMULATE_PREPARES => false
          ));


          public function getConnection() return $this->_connection;



          Which can be used like so:



          $stmt = DB::getInstance()
          ->getConnection()
          ->Prepare('SELECT * FROM settings');

          $stmt->execute();
          foreach($stmt->fetchAll() as $row)
          // ...






          share|improve this answer




















          • Looks good but how to make functions work ? example fucntion function catplace($par) Global $pdo; $stmt = $pdo->prepare("SELECT * FROM categories WHERE place=:par ORDER BY created ASC"); $stmt->execute(array(':par'=>$par)); $b = $stmt->fetchAll(PDO::FETCH_ASSOC); return $b;
            – kader kandar
            Nov 11 at 14:53










          • You can use it like so with PDOEasy.
            – Jaquarh
            Nov 11 at 14:59






          • 1




            woohoo thanks alot I got it wil use your class thanks again
            – kader kandar
            Nov 11 at 15:00












          up vote
          0
          down vote



          accepted







          up vote
          0
          down vote



          accepted






          Perhaps keep one connection, rather than opening multiple connections to the Database. You can look into a project PDOEasy that I created to make MVC easy with PDO or use the below static example.



          class DB

          private $_connection;
          private static $_instance;

          public static function getInstance()
          if(self::$_instance) return self::$_instance;
          self::$_instance = new self();
          return self::$_instance;


          private function __construct()
          $this->_connection = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD, array(
          PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
          PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
          PDO::ATTR_EMULATE_PREPARES => false
          ));


          public function getConnection() return $this->_connection;



          Which can be used like so:



          $stmt = DB::getInstance()
          ->getConnection()
          ->Prepare('SELECT * FROM settings');

          $stmt->execute();
          foreach($stmt->fetchAll() as $row)
          // ...






          share|improve this answer












          Perhaps keep one connection, rather than opening multiple connections to the Database. You can look into a project PDOEasy that I created to make MVC easy with PDO or use the below static example.



          class DB

          private $_connection;
          private static $_instance;

          public static function getInstance()
          if(self::$_instance) return self::$_instance;
          self::$_instance = new self();
          return self::$_instance;


          private function __construct()
          $this->_connection = new PDO('mysql:host='.DB_SERVER.';dbname='.DB_NAME.'', DB_USERNAME, DB_PASSWORD, array(
          PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
          PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
          PDO::ATTR_EMULATE_PREPARES => false
          ));


          public function getConnection() return $this->_connection;



          Which can be used like so:



          $stmt = DB::getInstance()
          ->getConnection()
          ->Prepare('SELECT * FROM settings');

          $stmt->execute();
          foreach($stmt->fetchAll() as $row)
          // ...







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 11 at 14:34









          Jaquarh

          2,925931




          2,925931











          • Looks good but how to make functions work ? example fucntion function catplace($par) Global $pdo; $stmt = $pdo->prepare("SELECT * FROM categories WHERE place=:par ORDER BY created ASC"); $stmt->execute(array(':par'=>$par)); $b = $stmt->fetchAll(PDO::FETCH_ASSOC); return $b;
            – kader kandar
            Nov 11 at 14:53










          • You can use it like so with PDOEasy.
            – Jaquarh
            Nov 11 at 14:59






          • 1




            woohoo thanks alot I got it wil use your class thanks again
            – kader kandar
            Nov 11 at 15:00
















          • Looks good but how to make functions work ? example fucntion function catplace($par) Global $pdo; $stmt = $pdo->prepare("SELECT * FROM categories WHERE place=:par ORDER BY created ASC"); $stmt->execute(array(':par'=>$par)); $b = $stmt->fetchAll(PDO::FETCH_ASSOC); return $b;
            – kader kandar
            Nov 11 at 14:53










          • You can use it like so with PDOEasy.
            – Jaquarh
            Nov 11 at 14:59






          • 1




            woohoo thanks alot I got it wil use your class thanks again
            – kader kandar
            Nov 11 at 15:00















          Looks good but how to make functions work ? example fucntion function catplace($par) Global $pdo; $stmt = $pdo->prepare("SELECT * FROM categories WHERE place=:par ORDER BY created ASC"); $stmt->execute(array(':par'=>$par)); $b = $stmt->fetchAll(PDO::FETCH_ASSOC); return $b;
          – kader kandar
          Nov 11 at 14:53




          Looks good but how to make functions work ? example fucntion function catplace($par) Global $pdo; $stmt = $pdo->prepare("SELECT * FROM categories WHERE place=:par ORDER BY created ASC"); $stmt->execute(array(':par'=>$par)); $b = $stmt->fetchAll(PDO::FETCH_ASSOC); return $b;
          – kader kandar
          Nov 11 at 14:53












          You can use it like so with PDOEasy.
          – Jaquarh
          Nov 11 at 14:59




          You can use it like so with PDOEasy.
          – Jaquarh
          Nov 11 at 14:59




          1




          1




          woohoo thanks alot I got it wil use your class thanks again
          – kader kandar
          Nov 11 at 15:00




          woohoo thanks alot I got it wil use your class thanks again
          – kader kandar
          Nov 11 at 15:00

















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