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pdo-crud-for-free

This package provides a few classes to try to give programmers using PDO (with MySQL) in a simple way some instance CRUD (create-read-update-delete) method, 'for free', simply by subclassing \Mattsmithdev\PdoCrud\DatabaseTable.

All code is (intended :-) to follow PSR-1, PSR-2 coding standards. Classes are following the PSR-4 autoloading standard.

Install

Via Composer

NOTE - until I get the hang of SemVer (and get to a 1.0.0 or later version), then you'll need to force the dev-master download as follows:

Usage

This example assumes you have a MySQL DB table named 'products', with columns 'id' and 'description'. You need to write a corresponding class 'Product' (note capital first letter ...).

For more details see below. Also there is a full sample web application project on GitGub at: (pdo-crud-for-free-example-project)[https://github.com/dr-matt-smith/pdo-crud-for-free-example-project]

More detailed usage instructions (and important assumptions)

ASSUMPTION 1: lowerCamelCase - DB table column names matching PHP Class properties

This tool assumes your database table column names, and their corresponding PHP private class properties are named consistently in 'lowerCamelCase' e.g.

id
title
category
price

ASSUMPTION 2: lower case plural DB table name mapping to upper case singular PHP class name

If you have a DB table 'products' this will correspond to a PHP class 'Product'

table names are named lower case, and are plural nouns, e.g 'users' PHP class names are named with a capital first letter, and are singular nouns, e.g. 'User'

ASSUMPTION 3: no constructor for your PHP classes

due to the nature of PDO populating properties of objects when DB rows are converted into object instances do not have a constructor for the PHP classes that correspond to your DB tables

so you'd create a new object, and use the objects public 'setter' methods e.g.

$p = new Product();
$p->setDescription('hammer');
$p->setPrice(9.99);
etc.

step 1: create your DB tables

e.g. create your tables (with integer 'id' field, primary key, auto-increment)

e.g. SQL table to store DVD data

id:int (primary key, autoincrement)
title:text
category:text
price:float

step 2: create a corresponding PHP class, and subclass from Mattsmithdev\PdoCrud\DatabaseTable

e.g.

<?php
namespace Whatever;

use Mattsmithdev\PdoCrud\DatabaseTable;

    class Dvd extends DatabaseTable
    {
        private $id;
        private $title;
        private $category;
        private $price;

        // and public getters and setters ...

step 3: now use the 'magically appearing' static DB CRUD methods

e.g. to get an array of all dvd records from table 'dvds' just write:

$dvds = Dvd::getAll();

::getAll()

this method returns an array of objects for each row of the corresponding DB table e.g.

// array of Dvd objects, populated from database table 'dvds'
$dvds = Dvd::getAll();

::getOneById($id)

this method returns one object of class for the corresponding DB table record with the given 'id' (returns 'null' if no such record exists with that primary key id) e.g.

// one Dvd object (or 'null'), populated by row in database table 'dvds' with id=27
$dvds = Dvd::getOneById(27);

::delete($id)

this method deletes the record corresponding to the given 'id' returns true/false depending on success of the deletion e.g.

// delete row in database table 'dvds' with id=12
$deleteSuccess = Dvd::delete(12);

::insert($dvd)

this method adds a new row to the database, based on the contents of the provided object (any 'id' in this object is ignored, since the table is auto-increment, so it's left to the DB to assign a new, unique 'id' for new records) returns the 'id' of the new record (or -1 if error when inserting) e.g.

// delete row in database table 'dvds' with id=12
$dvd = new Dvd();
$dvd->setTitle('Jaws II');
$dvd->setCategory('thriller');
$dvd->setPrice(9.99);

// create the new Dvd row
$id = Dvd::insert($dvd);

// decision based on success/failure of insert
if ($id < 0){
    // error action
} else {
    // success action
}

::update($dvd)

this method adds a UPDATES an existing row in the database, based on the contents of the provided object returns true/false depending on success of the deletion

e.g.

// update DB record for object 'dvd'
$updateSuccess = Dvd:update($dvd);

::searchByColumn($columnName, $searchText))

perform an SQL '%' wildcard search on the given column with the given search text returns an array of objects that match an SQL 'LIKE' query

e.g.

// get all Dvds with 'jaws' in the title
$jawsDvds = Dvd::searchByColumn('title', 'jaws');

custom PDO methods

If the 'free' DB methods are insufficient, it's easy to add your own methods to your PHP classes that correspond to your DB tables.

Here is a method that could be added to a class Product allowing a custom search by 'id' and text within 'descrition':

/**
 * illustrate custom PDO DB method
 * in this case we search for products with an id >= $minId, and whose descrption contains $searchText
 *
 * @param $minId
 * @param $searchText
 *
 * @return array
 */
public static function customSearch($minId, $searchText)
{
    $db = new DatabaseManager();
    $connection = $db->getDbh();

    // wrap wildcard '%' around the serach text for the SQL query
    $searchText = '%' . $searchText . '%';

    $sql = 'SELECT * FROM products WHERE (description LIKE :searchText) AND (id > :minId)';

    $statement = $connection->prepare($sql);
    $statement->bindParam(':minId', $minId, \PDO::PARAM_INT);
    $statement->bindParam(':searchText', $searchText, \PDO::PARAM_STR);
    $statement->setFetchMode(\PDO::FETCH_CLASS, '\\' . __CLASS__);
    $statement->execute();

    $products = $statement->fetchAll();

    return $products;
}

and here is an example of its usage, in a controller function:

// get products from DB as array of Product objects - id > minId, description containing $searchText
$minId = 2;
$searchText = 'er';
$products = Product::customSearch($minId, $searchText);

// outputs something like:
//  [5] pliers
//  [7] hammer
foreach ($products as $product){
    print '<p>';
    print 'id [' . $product->getId() . '] ';
    print $product->getDescription();
}

//  [1] nut -- not listed due to search criteria

Change log

Please see CHANGELOG for more information what has changed recently.

Testing

Contributing

Please see CONDUCT for details.

Security

If you discover any security related issues, please email [email protected] instead of using the issue tracker.

Credits

• [Matt Smith][https://github.com/dr-matt-smith]

License

The MIT License (MIT). Please see License File for more information.