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Editing:Database.php

<?php
/*
 * PDO Database Class
 * Connect to database
 * Create prepared statements
 * Bind values
 * Return rows and results
 */
class Database {
  private $host = DB_HOST;
  private $user = DB_USER;
  private $pass = DB_PASS;
  private $dbname = DB_NAME;

private $dbh;
  private $stmt;
  private $error;

public function __construct(){
    // Set DSN
    $dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname;
    $options = array(
      PDO::ATTR_PERSISTENT => true,
      PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
    );

// Create PDO instance
    try{
      $this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
    } catch(PDOException $e){
      $this->error = $e->getMessage();
      echo $this->error;
    }
  }

// Prepare statement with query
  public function query($sql){
    $this->stmt = $this->dbh->prepare($sql);
  }

// Bind values
  public function bind($param, $value, $type = null){
    if(is_null($type)){
      switch(true){
        case is_int($value):
          $type = PDO::PARAM_INT;
          break;
        case is_bool($value):
          $type = PDO::PARAM_BOOL;
          break;
        case is_null($value):
          $type = PDO::PARAM_NULL;
          break;
        default:
          $type = PDO::PARAM_STR;
      }
    }

$this->stmt->bindValue($param, $value, $type);
  }

// Execute the prepared statement
  public function execute(){
    return $this->stmt->execute();
  }

// Get result set as array of objects
  public function resultSet(){
    $this->execute();
    return $this->stmt->fetchAll(PDO::FETCH_OBJ);
  }

// Get single record as object
  public function single(){
    $this->execute();
    return $this->stmt->fetch(PDO::FETCH_OBJ);
  }

// Get row count
  public function rowCount(){
    return $this->stmt->rowCount();
  }
}

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Editing:Database.php