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PHP - Oop Database Class And Query Method Help
Hi
I have created a Database class that uses the singleton method. I have a query method within this class so i would call this to return an array of results. What i need to know is what would be the best way to use this returned array Database Class: Code: [Select] <?php class Database { private static $dbInstance; private $hostname; private $username; private $password; private $database; private function __construct() { $this->hostname = 'localhost'; $this->username = 'user'; $this->password = 'pass'; $this->database = 'test'; mysql_connect($this->hostname, $this->username, $this->password); mysql_select_db($this->database); } public static function getDBInstance() { if (!self::$dbInstance) { self::$dbInstance = new Database(); } return self::$dbInstance; } public function query($q) { return mysql_query($q); } } ?> Person Class: Code: [Select] <?php require_once('Database.php'); class person { public function getName($id) { $con = Database::getDBInstance(); $query = $con->query("select name from data where id = ".$id); $result = mysql_fetch_assoc($query); echo $result['name']; } } ?> Index page: Code: [Select] <?php require_once('person.php'); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <title>Untitled Document</title> </head> <body> <?php $person = new person(); $person->getName(1); echo "<br />"; $person->getName(2); ?> </body> </html> Similar TutorialsCan I not pass references into class properities from outside the object? class db_manipulation { private $connection = NULL; function __construct(&$database_connection) { $this->connection = $database_connection; if (!$this->connection) die('couldnt connection to database'); } function __destruct() { mysqli_close($this->connection); } } Results in: Warning: mysqli_close() [function.mysqli-close]: Couldn't fetch mysqli in
My script has 3 classes (that are relevant to this discussion): DB, User and Validate. They are all in independent files and loaded automatically, when required, by an autoloader.
The error messages I am getting a Any pointers as to what I am doing wrong, or what I should be doing, would be most welcome. I have mysqli object in Database class base: [color=]database class:[/color] class Database { private $dbLink = null; public function __construct() { if (is_null($this->dbLink)) { // load db information to connect $init_array = parse_ini_file("../init.ini.inc", true); $this->dbLink = new mysqli($init_array['database']['host'], $init_array['database']['usr'], $init_array['database']['pwd'], $init_array['database']['db']); if (mysqli_connect_errno()) { $this->dbLink = null; } } } public function __destruct() { $this->dbLink->close(); } } Class derived is Articles where I use object dBLink in base (or parent) class and I can't access to mysqli methods (dbLink member of base class): Articles class: require_once ('./includes/db.inc'); class Articles extends Database{ private $id, .... .... $visible = null; public function __construct() { // Set date as 2009-07-08 07:35:00 $this->lastUpdDate = date('Y-m-d H:i:s'); $this->creationDate = date('Y-m-d H:i:s'); } // Setter .... .... // Getter .... .... public function getArticlesByPosition($numArticles) { if ($result = $this->dbLink->query('SELECT * FROM articles ORDER BY position LIMIT '.$numArticles)) { $i = 0; while ($ret = $result->fetch_array(MYSQLI_ASSOC)) { $arts[$i] = $ret; } $result->close(); return $arts; } } } In my front page php I use article class: include_once('./includes/articles.inc'); $articlesObj = new articles(); $articles = $articlesObj->getArticlesByPosition(1); var_dump($articles); [color=]Error that go out is follow[/color] Notice: Undefined property: Articles::$dbLink in articles.inc on line 89 Fatal error: Call to a member function query() on a non-object in articles.inc on line 89 If I remove constructor on derived class Articles result don't change Please help me Hi Can you call Class A's methods or properties from Class B's methods? Thanks. Ok. I know you can pass the object of a class as an argument. Example: class A { function test() { echo "This is TEST from class A"; } } class B { function __construct( $obj ) { $this->a = $obj; } function test() { $this->a->test(); } } Then you could do: $a = new A(); $b = new B($a); Ok so that's one way i know of. I also thought that you could make a method static, and do this: (assuming class A's test is 'static') class B { function test() { A::test(); } } But that is not working. I'd like to know all possible ways of accomplishing this. Any hints are appreciated. thanks If a class has a constructor but also has a static method, if I call the static method does the constructor run so that I can use an output from the constructor in my static method? --Kenoli I have two classes: ## Admin.php <?php class Admin { public function __construct() { include("Config.php"); } /** * deletes a client * @returns true or false */ function deleteClient($id) { return mysql_query("DELETE FROM usernames WHERE id = '$id'"); } } ?> ## Projects.php <?php class Projects { public function __construct() { include("Config.php"); $this->admin = $admin; $this->dataFolder = $dataFolder; } /** * Deletes a project * @returns true or false */ function deleteProject($id) { $root = $_SERVER['DOCUMENT_ROOT']; $theDir = $root . $this->dataFolder; $sql = mysql_query("SELECT * FROM projectData WHERE proj_id = '$id'"); while ($row = mysql_fetch_array($sql)) { $mainFile = $row['path']; $thumb = $row['thumbnail']; if ($thumb != 'null') { unlink($theDir . "/" . substr($thumb,13)); } unlink($theDir . "/" . substr($mainFile,13)); } $delete = mysql_query("DELETE FROM projectData WHERE proj_id = '$id'"); $getDir = mysql_query("SELECT proj_path FROM projects WHERE id = '$id'"); $res = mysql_fetch_array($getDir); rmdir($theDir . "/" . $res['proj_path']); return mysql_query("DELETE FROM projects WHERE id = '$id'"); } } ?> How can I call deleteProject() from within Admin.php? Hi people! class FirstOne{ public function FunctionOne($FirstInput){ //do stuff and output value return $value1; } } Then:- class SecondOne{ public function FunctionTwo($AnotherInput){ //do stuff and output value return $value2; } } What I want to know is this, if I want to use FunctionOne() in Class SecondOne do I do it like this:- (Assume as I have instantiated the first class using $Test = new FirstOne(); ) class SecondOne{ function SecondedFunction(){ global $Test; return $Test->FunctionOne(); } public function FunctionTwo($AnotherInput){ //do stuff and output value return $value2; } public function FunctionThree(){ //some code here $this->Test->SecondedFunction();<--I think as I can omit the $this-> reference } } My point is: Do I have to do it this way or is there way of having this done through __construct() that would negate the need for a third party function? I have a version working, I just think that it is a little convoluted in the way as I have done it, so I thought I would ask you guys. Any help/advice is appreciated. Cheers Rw I found class on the net, and i am having a bit of a problem to understand how does update method works. Here is the code: Code: [Select] public function update() { global $database; // Don't forget your SQL syntax and good habits: // - UPDATE table SET key='value', key='value' WHERE condition // - single-quotes around all values // - escape all values to prevent SQL injection $attributes = $this->sanitized_attributes(); $attribute_pairs = array(); foreach($attributes as $key => $value) { $attribute_pairs[] = "{$key}='{$value}'"; } $sql = "UPDATE ".self::$table_name." SET "; $sql .= join(", ", $attribute_pairs); $sql .= " WHERE id=". $database->escape_value($this->id); $database->query($sql); return ($database->affected_rows() == 1) ? true : false; } I have form like this to deal with update: Code: [Select] <form action="index.php?page=languages" enctype="multipart/form-data" method="POST"> <?php foreach($language as $lang){ ?> <input type="hidden" name="MAX_FILE_SIZE" value="<?php echo $max_file_size; ?>" /> <label>Jezik</label><input type="text" size="50" name="language" value="<?php echo $lang->lang; ?>" /><br> <input type="hidden" name="id_lang" value="<?php echo $lang->id_lang; ?>" /> <label>Slika</label><input type="file" name="image"><?php echo "<img src=\"../images/"; echo $lang->image; echo "\">"; ?> <br> <label>Pozicija</label><input type="text" name="pozicija" value="<?php echo $lang->pozicija; ?>" size="2" /></p> <br> <input type="submit" name="submit_update" value="Unesi"> <?php } ?> </form> and code to start the function: Code: [Select] if(isset($_POST['submit_update'])) { $language = new Jezik(); $language->update(); } What next??? Hi I have a problem with the following: Code: [Select] <?php class ClassA { public $propertyClassName = "ClassB"; public function methodClassName() { return "ClassB"; } } class ClassB { public function bmethod() { echo "great!"; } } //works $a = new ClassA(); $b = new $a->propertyClassName(); $b->bmethod(); //doesn't work $a = new ClassA(); $b = new $a->methodClassName(); $b->bmethod(); ?> Of course I could do Code: [Select] <?php $a = new ClassA(); $className = $a->methodClassName(); $b = new $className; $b->bmethod(); ?>but isn't there a way to do this without saving the method's return to a variable? Thanks in advance flolam Using this locally works fine: $html = $name::add_content($name, $html); but i get the double colon error whe using it live. $name is a name of a valid class. What could throw this error when it works locally? Well in the class UserValidator I have a public method validate(), which checks the validation type and then calls specific private methods to execute the validation script. It gets a bit tricky here since the method validate() has to decide what private method to call. I am thinking about using call_user_func_array(), the script currently looks like this below: Code: [Select] public function validate(){ // The core method validate, it sends requests to different private methods based on the type if(empty($this->type)) throw new Exception('The validation type is empty, something must be seriously wrong...'); if(is_array($this->type) and !is_array($this->value)) throw new Exception('Cannot have scalar value if the type is an array.'); if(!is_array($this->type) and is_array($this->value)) throw new Exception('Cannot have scalar type if the value is an array.'); // Now we are validating our user data or input! $validarray = array("register", "login", "password", "session", "email", "reset", "profile", "contacts", "friends"); foreach($this->type as $val){ $method = "{$val}validate"; if(in_array($val, $validarray)) call_user_func_array(array($this, $method), array()); } } The method to execute depends on the validation type passed into the validator class, so it is somewhat like a dynamic function call. The problem is, well, I am not sure if I am using call_user_func_array() properly. I read it from php manual that it needs to accept a class instance, but there is no such instance inside a class method so I use $this in the argument. Is this the correct way of using call_user_func_array()? If not, how am I supposed to do this? thanks. I have these two classes: Code: [Select] <?php class A { private $id; public function __construct() { $this->id = '11111'; } public function getProperty($prop) { return $this->$prop; } }?> Code: [Select] <?php class B extends A { private $message = "Nope, can't see it"; public function __construct() { parent::__construct(); $this->message = "Yep, I can see it"; } }?> I tried this, but it just outputs the id (the first call) Code: [Select] $class = new B; echo $class->getProperty('id'); echo $class->getProperty('message'); Why is that? I thought I could use a parent method on a child property.. *EDIT* Using a public or protected visibility on the message property gets me the output I expect...how come? I've used a showQuery() method for years which accepted a SQL string and data array. Sometimes, I just have the PDO statement and I need to add temporary script just to keep track of the SQL string. Was looking at debugDumpParams() today which prompted me to create the new showStmtQuery() method. My approach of extracting the table from debugDumpParams's printed results is a little clunky. Any recommendations? Could/should other information from debugDumpParams's output be used? I typically don't use bound parameters but know I should more often. Suggestions how this could be changed to work with bound parameters? Thanks
function showQuery(string $sql, arrray $data, bool $keepLineBreaks=false):string {
$keys = [];
$values = [];
foreach ($data as $key=>$value) {
$keys[] = is_string($key)?'/:'.$key.'/':'/[?]/';
$values[] = is_numeric($value)?$value:"'$value'";
}
$sql = preg_replace($keys, $values, $sql, 1, $count);
return $keepLineBreaks?$sql:str_replace(array("\r", "\n"), ' ', $sql);
}
function showStmtQuery(\PDOStatement $stmt, array $data, bool $keepLineBreaks=false):string {
ob_start();
$stmt->debugDumpParams();
$sql = ob_get_contents();
ob_end_clean();
//$sql = strtok(substr($sql, strpos($sql, '] ')+2), "\n");
$start=strpos($sql, '] ')+2;
$sql = substr($sql, $start, strpos($sql, "\nParams:") - $start);
return showQuery($sql);
}
$data=[5,50];
$sth = $pdo->prepare('SELECT *
FROM my_table
WHERE id > ? AND id < ?');
echo(showStmtQuery($sth, $data).PHP_EOL); //SELECT * FROM my_table WHERE id > 5 AND id < 50
$data=['lowId' => 5, 'highId' => 50];
$sth = $pdo->prepare('SELECT *
FROM my_table
WHERE id > :lowId AND id < :highId');
echo(showStmtQuery($sth, $data).PHP_EOL); //SELECT * FROM my_table WHERE id > 5 AND id < 50
Changed to use original showQuery function I use AJAX method to get the value for `$month` from the year-month selection in my page. The year-month is pass correct correctly when it gets into my PHP code. But i am not sure how do i get the value and use it for my sql condition. I'm trying to plot a graph using Chart JS according to the year-month selection from the user. when the user select "2021-03" all the order that is made in the month of March will be plotted into the graph. There's no data shown in my page now and i do not know how can i query it. Can anyone enlighten me how can i do it? Because i do not know what mistake did i made here. Any kind of explanation will be appreciated. Thanks!
This is the code that i use for year-month selection
<div class="col-2 my-auto">
<input type="month" id="month" class="form-control" value="<?php echo date('Y-m'); ?>">
</div>
<div class="col-2 my-auto">
<button type="button" class="btn btn-info" onclick="loadchart();">
<i class="nc-icon nc-zoom-split"></i>
</button>
</div>
This is the AJAX method
<script type="text/javascript">
function loadchart()
{
$('#spin1').show();
var month= $('#month').val();
var data = {
month: month,
}
$.ajax({
method:"GET",
data:data,
url:"includes/loadchart.php",
success:function(data)
{
$('#loadchart').html(data);
}
});
}
this is my loadchart.php
<?php
include '../session.php';
if(isset($_GET['month']))
{
$months = $_GET['month'];
?>
<?php
$days = array();
$gross_sales = array();
$average_sales = array();
$type = CAL_GREGORIAN;
$month = date('n');
$year = date('Y');
$day_count = cal_days_in_month($type, $month, $year);
for ($i = 1; $i <= $day_count; $i++) {
$sql = "SELECT *, SUM(purchase_price) as purchase_price FROM ordered_items WHERE DAY(order_datetime) = '$i' AND MONTH(order_datetime) = MONTH('".$months."') AND YEAR(order_datetime) = YEAR('".$months."') AND order_status = 5 ";
$query = $conn->query($sql);
$total = $query->num_rows;
$row = $query->fetch_assoc();
if($row['purchase_price'] != 0)
{
$gross_sales[] = $row['purchase_price'];
}
else if ($row['purchase_price'] == 0 && $i <= date('d')) {
$gross_sales[] = 0;
}
$average_sales[] = $row['purchase_price'] / $day_count;
$day = $i.'/'.$month;
array_push($days, $day);
}
$days = json_encode($days);
$daily_gross_sales = json_encode($gross_sales);
$average_gross_sales = json_encode($average_sales);
?>
<script>
const colors = {
colorcode: {
fill: '#51cbce',
stroke: '#51cbce',
},
};
var ctx2 = document.getElementById("attChart").getContext("2d");
const attChart = new Chart(ctx2, {
type: 'line',
data: {
labels: <?php echo $days; ?>,
datasets: [{
label: "Gross Sales: RM",
fill: true,
pointBackgroundColor: colors.colorcode.stroke,
borderColor: colors.colorcode.stroke,
pointHighlightStroke: colors.colorcode.stroke,
borderCapStyle: 'dot',
pointRadius: 5,
pointHoverRadius: 5,
pointStyle: 'dot',
data: <?php echo $daily_gross_sales; ?>,
showLine: true
},
{
label: "Average Sales: RM",
fill: true,
pointBackgroundColor: '#FF0000',
borderColor: ' #FF0000 ',
pointHighlightStroke: '#FF0000',
borderCapStyle: 'dot',
pointRadius: 5,
pointHoverRadius: 5,
pointStyle: 'dot',
data: <?php echo $average_gross_sales; ?>,
showLine: true
}
]
}
<?php
}
?>
I do not know why my query from the loadchart.php is incorrect. Please help me with this advice me on this issue thanks!
$sql = "SELECT *, SUM(purchase_price) as purchase_price FROM ordered_items WHERE DAY(order_datetime) = '$i' AND MONTH(order_datetime) = MONTH('".$months."') AND YEAR(order_datetime) = YEAR('".$months."') AND order_status = 5 ";
i have a form that edits a user in the database. here is what i have right now: Code: [Select] if (isset($_POST['submit'])) { mysql_select_db($database_uploader, $uploader); $query = "SELECT * FROM members WHERE id='" . mysql_real_escape_string($id) . "'"; if (mysql_num_rows($result) > 0) { $name = $row[name]; $username = $row[uname]; $email = $row[email]; $acntActivation = $row[activated]; $accountType = $row[acntType]; $accountStatus = $row[acntStatus]; $bandwhitech = $row[bandwhitech]; $notes = $row[notes]; $timezone = $row[timezone]; // METHOD: If $_post[name] != $name, then update database record to new value mysql_query(sprintf("UPDATE members SET notes = '%s'", mysql_real_escape_string("hello there!"))) or die(mysql_error()); mysql_close($con); } } 1) the notes are not being updated 2) what would be the best way to update each field that is changed. i was just going to insert each individually, after checking if it is different than what is in the database for the record. would it just be better to update the whole record, instead of one piece at a time? it seems like the first way would take up too much load time. :p Hi, I'm new to PHP/MySQL and need some help getting my query to work for my selection list: The selection list is built with: <form action='processformmissing.php' method='POST'> <fieldset> <legend>Choose Department</legend> <select name='depart'> <option value=''></option> <?php while ($row = mysqli_fetch_array($result)) { extract($row); echo "<option value='$department'>$department</option>\n"; } ?> </select> <p><input type='submit' value='Select Department' /></p> </fieldset> </form> The data is then sent to: $depart = $_POST['depart']; $deptlike = "%".$depart."%"; echo "<p>$depart</p>"; echo "<p>$deptlike</p>"; $query = "SELECT * FROM lifecerts INNER JOIN employees ON lifecerts.cid = employees.cid WHERE department LIKE '$deptlike' ORDER BY employees.name"; Hitting the submit button from my selection list form seems to be working fine because when I echo my data ($depart and $deptlike) it is giving me the correct value, but the query doesn't give me any results. However, if my post data comes from a text box instead of a selection list, my query works fine. Any thoughts on what I'm doing wrong??? Many thanks! This topic has been moved to Third Party PHP Scripts. http://www.phpfreaks.com/forums/index.php?topic=321957.0 I'm not exactly sure how to go about this, but I have an IM & online friends script that shows the online friends both in a module position as well as in a jquery box. Currently it's set to link the results to the IM function for both positions, however I want the module position to link to their profile and the jquery box to link to the IM function. Here is the bit of code where this is done: <!-- I added this as the second option to link to the profile... $text2.="<div onmousedown=\"createChatBoxmesg('".$res[$show_name]."','".$res['id']."')\"><a class=\"texts\" href='index.php?option=com_comprofiler'><img style='padding:0px 5px 0px 0px;' src='".$res['avatar']."' height='25' width='25' />".$res[$show_name]."</a></div><hr/>"; --> $text.="<div onmousedown=\"createChatBoxmesg('".$res[$show_name]."','".$res['id']."')\"><a class=\"texts\" href='javascript:void(0)'><img style='padding:0px 5px 0px 0px;' src='".$res['avatar']."' height='25' width='25' />".$res[$show_name]."</a></div><hr/>"; } } $query="SELECT * FROM frei_chat WHERE frei_chat.to=$usr_id AND recd=0 ORDER BY sent"; $db->setQuery($query); $jon->messages=$db->loadAssocList(); <!-- I need to add this here but obviously so far u can just have one or the other.. $jon->userdata=$text2; --> $jon->userdata=$text; $jon->result=$exec; $jon->count=$onlcnt; It would be simple if I could do an if else depending on the div id or class it sits in but as far as I know there is no real way to do that. Anyone have any ideas on how to do this? i have a simple class which sees if there are any members in the database with the supplied details, then returns a simple number to show how many results there are, but it isnt working and throwing the error: Code: [Select] Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in C:\wamp\www\classTest\classes\user_process.php on line 52 here is the class: require_once("db_mysql.php"); require_once("./init.php"); class emptyArgs extends Exception { function __toString() { return "<strong>Empty Arguments</strong>"; } } class user_process { public $user_name; public $password; public function login($user_name, $password) { try { if (empty($user_name) || empty($password)) { throw new emptyArgs(); } if ($user_name == "") { throw new emptyArgs(); } } catch (emptyArgs $e) { echo $e; echo "<p>Please Supply All Details Marked *</p>"; } echo $user_name; echo $password; $query = <<<QUERY SELECT COUNT(*) FROM ".TBL_PREFIX."members WHERE user_username = '$user_name' AND user_password = '$password' QUERY; $process = mysql_query($query); $result = mysql_num_rows($process); // Line 52 where the error originates return $result; } } and here is the call: $user = new user_process(); $user->login("username", "password"); All of the database details are correct and the values do match in the database. Where am i going wrong? Note that this class is just for testing and not actually used. |
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