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PDO wrapper with query builder

PDO wrapper extends PDO and PDOStatement classes and add some nice methods as insert/update/delete and so on. Also, there is very useful SQL query builder.


Because library extends PDO driver, you can use all of native PDO methods and new additional:

DB - The database class

  • insert - insert object or array as row to database table (optionaly: using prepared statement)
  • update - update existent row in database table (optionaly: using prepared statement)
  • replace - insert or replace (using REPLACE table... syntax)
  • save - save data to table (method determinate does insert or update will be used)
  • delete - delete row(s) in database table
  • count - shortcut for SELECT COUNT(*) statement
  • select - query build object
  • createQuery - create new query builder
  • getColumnsFromTable - all columns from table as array


  • fetchInto - fetch row into object (optionaly: only from specific table)
  • fetchIntoFromLastRow - fetch another object from last row (based on table name)
  • fetchCollection - fetch collection of objects (custom defined object or stdClass)
  • getColumnValue - value from specific column

Query - Build SQL query object

  • select - statement for SELECT
  • from - statement for FROM
  • where - adding new WHERE statement. Multiple where will be joined by AND
  • whereIn - adding WHERE IN (...) statement
  • whereNotIn - adding WHERE NOT IN (...) statement
  • having - statement for HAVING
  • join - join table syntax
  • groupBy - GROUP BY statement
  • orderBy - ORDER BY statement
  • limit - LIMIT statement
  • getQuery - buld and return query string
  • execute - execute query

See more information about how to use database query builder.

Usage examples

Creating database instance

$db = new database\DB("mysql:host=localhost;dbname=YOUR_DB_NAME", "YOUR_DB_USERNAME", "YOUR_DB_PASSWORD");


Execute query and fetch User object:

class User {}

$user_id = 1;
$sql = "SELECT * FROM users WHERE user_id = ? AND is_active = ?";
$user = $db->executeQuery($sql, array($user_id, 1))
	->fetchInto(new User); // or ->fetchObject("User") as in standard PDO driver

If you need a collection of User objects, you can use fetchCollection method:

$users = $db->executeQuery($sql, array($user_id, 1))
	->fetchCollection(new User); // or ->fetchCollection("User");

More complex, with query builder. You can build 'native' structure of objects. For example, you can fetch collection of objects Post and every Post object may have a property $author which is a instance of User object:

class User
     * Get user's first and last name
     * @return string
    function getName() {
        return $this->first_name . " ". $this->last_name;

class Post
	 * @var User
	public $author;

// Library need FETCH_TABLE_NAMES option for mapping class names and table names

$sql = $db->select("p.*, u.*")
	->from("posts p")
	->join("INNER JOIN users u USING(user_id)")
	->where("u.user_id = ?", $user_id)
$stmt = $sql->execute();

/* @var Post[] $post_collection  */
$post_collection = array();

// Fetching data into Post object from posts table (p is alias)
while($post = $stmt->fetchInto(new Post, "p")) {

	// fetch User object from users table (u is alias)
	$post->author = $stmt->fetchIntoFromLastRow(new User, "u");

	$post_collection[] = $post;

// You can send $post_collection from model to view in your controller, so here is usage in view
foreach($post_collection as $post) {
    echo $post->author->getName();


Library has insert method for easy inserting array or object as row to database table. Note that all other properties or elements that not match column names will be ignored.

$data = array(
	"username" => "User 1234",
	"email" => "",
	"mtime" => time()
$db->insert("users", $data);

Insert with prepared statement

Third param for insert() method is "unique prepared stmt key". Every insert which have that key will use the same prepared statement.

foreach($data_array as $data) {
	$db->insert("users", $data, "unique_stmt_key");


Some examples of update statement

$user_id = 1;
$db->update("users", $data, "user_id = ?", $user_id);
$db->update("users", $data, "user_id = ? AND email = ?", array(1, ""));

Saving data

Automatic determination of INSERT or UPDATE. If $data['user_id'] exits it will be UPDATE, otherwise it will be INSERT.

$db->save("users", $data, "user_id"); // user_id is name of PRIMARY column

More examples

// Delete row in table
// some as $db->exec("DELETE FROM users WHERE user_id = 1");
$db->delete("users", "user_id = ?", $user_id);

// Count rows in table
$count = $db->count("users");

/* @var User[] $users Collection of User objects */
$users = $db->executeQuery("SELECT * FROM users")->fetchCollection(new User);

See more examples for Sakila database


PHP/MySQL database wrapper, extends PDO and PDOStatement








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