<?php
/**
* Copyright (C) 2019 Phppot
*
* Distributed under MIT license with an exception that,
* you don’t have to include the full MIT License in your code.
* In essense, you can use it on commercial software, modify and distribute free.
* Though not mandatory, you are requested to attribute this URL in your code or website.
*/
namespace Phppot;
/**
* Generic datasource class for handling DB operations.
* Uses MySqli and PreparedStatements.
*
* @version 2.5 - recordCount function added
*/
class DataSource
{
// PHP 7.1.0 visibility modifiers are allowed for class constants.
// when using above 7.1.0, declare the below constants as private
const HOST = 'localhost';
const USERNAME = 'root';
const PASSWORD = '';
const DATABASENAME = 'dbname';
private $conn;
/**
* PHP implicitly takes care of cleanup for default connection types.
* So no need to worry about closing the connection.
*
* Singletons not required in PHP as there is no
* concept of shared memory.
* Every object lives only for a request.
*
* Keeping things simple and that works!
*/
function __construct()
{
$this->conn = $this->getConnection();
}
/**
* If connection object is needed use this method and get access to it.
* Otherwise, use the below methods for insert / update / etc.
*
* @return \mysqli
*/
public function getConnection()
{
$conn = new \mysqli(self::HOST, self::USERNAME, self::PASSWORD, self::DATABASENAME);
if (mysqli_connect_errno()) {
trigger_error("Problem with connecting to database.");
}
$conn->set_charset("utf8");
return $conn;
}
/**
* To get database results
*
* @param string $query
* @param string $paramType
* @param array $paramArray
* @return array
*/
public function select($query, $paramType = "", $paramArray = array())
{
$stmt = $this->conn->prepare($query);
if (! empty($paramType) && ! empty($paramArray)) {
$this->bindQueryParams($stmt, $paramType, $paramArray);
}
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$resultset[] = $row;
}
}
if (! empty($resultset)) {
return $resultset;
}
}
/**
* To insert
*
* @param string $query
* @param string $paramType
* @param array $paramArray
* @return int
*/
public function insert($query, $paramType, $paramArray)
{
$stmt = $this->conn->prepare($query);
$this->bindQueryParams($stmt, $paramType, $paramArray);
$stmt->execute();
$insertId = $stmt->insert_id;
return $insertId;
}
/**
* To execute query
*
* @param string $query
* @param string $paramType
* @param array $paramArray
*/
public function execute($query, $paramType = "", $paramArray = array())
{
$stmt = $this->conn->prepare($query);
if (! empty($paramType) && ! empty($paramArray)) {
$this->bindQueryParams($stmt, $paramType, $paramArray);
}
$stmt->execute();
}
/**
* 1.
* Prepares parameter binding
* 2. Bind prameters to the sql statement
*
* @param string $stmt
* @param string $paramType
* @param array $paramArray
*/
public function bindQueryParams($stmt, $paramType, $paramArray = array())
{
$paramValueReference[] = &$paramType;
for ($i = 0; $i < count($paramArray); $i ++) {
$paramValueReference[] = &$paramArray[$i];
}
call_user_func_array(array(
$stmt,
'bind_param'
), $paramValueReference);
}
/**
* To get database results
*
* @param string $query
* @param string $paramType
* @param array $paramArray
* @return array
*/
public function getRecordCount($query, $paramType = "", $paramArray = array())
{
$stmt = $this->conn->prepare($query);
if (! empty($paramType) && ! empty($paramArray)) {
$this->bindQueryParams($stmt, $paramType, $paramArray);
}
$stmt->execute();
$stmt->store_result();
$recordCount = $stmt->num_rows;
return $recordCount;
}
}
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