DbFinderPlugin - 0.4.0

The `DbFinder` is a symfony plugin that provides an easy API for finding Model objects, whether the underlying ORM is Propel or Doctrine.

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DbFinder plugin

The DbFinder is a symfony plugin that provides an easy API for finding Model objects, whether the underlying ORM is Propel or Doctrine. It can be seen as:

  • a usability layer to ease the use of Propel's Criteria object and Peer classes
  • an extension to Propel's limited capabilities to provide:
    • complex joins
    • custom hydration of related objects and columns
    • schema and relation introspection
  • a compatibility layer to allow plugins to work with both Propel and Doctrine

Warning: The Doctrine implementation is not yet complete. The syntax described below works completely with Propel 1.2 and 1.3, and partially with doctrine 0.11.

Overview

The idea behind this plugin is to write queries to retrieve model objects through an ORM, but fast. Inspired by Doctrine, Rails has_finder plugin and SQLAlchemy, DbFinder can be seen as "jQuery for symfony's model layer". It also aims at putting the things in the right order, meaning that writing a find() query will feel natural for those familiar with SQL.

// With Propel Peer and Criteria
$c = new Criteria()
$c->add(ArticlePeer::TITLE, '%world', Criteria::LIKE);
$c->add(ArticlePeer::IS_PUBLISHED, true);
$c->addAscendingOrderByColumn(ArticlePeer::CREATED_AT);
$articles = ArticlePeer::doSelectJoinCategory($c);
 
// with DbFinder
$articles = DbFinder::from('Article')->
  where('Title', 'like', '%world')->
  where('IsPublished', true)->
  orderBy('CreatedAt')->
  with('Category')->
  find();

DbFinder uses the same fluid interface as the sfFinder, so you won't be lost. It is compatible with symfony 1.0 and 1.1, with Propel 1.2 and 1.3, and with Doctrine 0.11. DbFinder comes with a Propel and a Doctrine adapter (sfPropelFinder, sfDoctrineFinder). Whenever you use DbFinder::from(), the finder will check whether you look for Propel or Doctrine objects and use the appropriate adapter.

You can also implement your own business logic to encapsulate complex queries, so that your queries look like real language:

// ArticleFinder extends sfPropelFinder. See how below
$finder = new ArticleFinder();
$articles = $finder->recent()->withComments()->notAnonymous()->wellRated()->find();

Installation

  • Install the plugin

    > php symfony plugin-install http://plugins.symfony-project.com/DbFinderPlugin

  • Clear the cache

    > php symfony cc

Usage

Finding objects

// Finding all Articles
$articles = DbFinder::from('Article')->find();
// Finding 3 Articles
$articles = DbFinder::from('Article')->find(3);
// Finding a single Article
$article = DbFinder::from('Article')->findOne();
// Finding the last Article (the finder will figure out the column to use for sorting)
$article = DbFinder::from('Article')->findLast();

Tip: When developing with the finder, you may prefer to have an array or string representation of the results rather than an array of objects. The finder objects provides three methods (toArray(), __toString() and toHtml()) that internally execute a find() and return something that you can output in your response.

Adding WHERE clause

$articleFinder = DbFinder::from('Article');
// Finding all Articles where title = 'foo'
$articles = $articleFinder->where('Title', 'foo')->find();
// Finding all Articles where title like 'foo%'
$articles = $articleFinder->where('Title', 'like', 'foo%')->find();
// Finding all Articles where published_at less than time()
$articles = $articleFinder->where('PublishedAt', '<', time())->find();
 
// You can chain WHERE clauses
$articles = $articleFinder->
  where('Title', 'foo')->
  where('PublishedAt', '<', time())->
  find();
// For OR conditions, use orWhere() instead of where()
$articles = $articleFinder->
  where('Title', 'foo')->
  where('PublishedAt', '<', time())->
  orWhere('Title', 'like', 'bar%')->
  find();
 
// The where() method accepts simple or composed column names ('ClassName.ColumnName')
$articles = $articleFinder->where('Article.Title', 'foo')->find();
// You can also use the magic whereXXX() method, removing the column argument and concatenating it to the method name
$articles = $articleFinder->whereTitle('foo')->find();
// Or, when your search is on a single column, use the magic findByXXX() method
$articles = $articleFinder->findByTitle('foo');

Ordering results

$articleFinder = DbFinder::from('Article');
// Finding all Articles ordered by created_at (ascending order by default)
$articles = $articleFinder->
  orderBy('CreatedAt')->
  find();
// Finding all Articles ordered by created_at desc
$articles = $articleFinder->
  orderBy('CreatedAt', 'desc')->
  find();
// You can also use the magic orderByXXX() method
$articles = $articleFinder->
  orderByCreatedAt()->
  find();

Chaining methods

The methods of the DbFinder object return the current finder object, so you can chain them together in a single call, and finish by any of the find() methods to launch the query.

// everything chained together
$articles = DbFinder::from('Article')->where('Title', 'like', '%world')->where('IsPublished', true)->orderBy('CreatedAt')->find();
// You can write it in several lines, too
$articles = DbFinder::from('Article')->
  where('Title', 'like', '%world')->
  where('IsPublished', true)->
  orderBy('CreatedAt')->
  find();

The syntax should remind you of sfFinder and sfTestBrowser.

Finding records related to another one

// Propel way
$comments = $article->getComments();
// DbFinder way
$commentFinder = DbFinder::from('Comment');
$comments = $commentFinder->
  where('ArticleId', $article->getId())->
  find();
// Or let the finder guess local and foreign columns based on the schema
$comments = $commentFinder->
  relatedTo($article)->
  find();

Since the finder way is longer than the native Propel way, what is the interest of using this relatedTo()? You get a DbFinder object when you use relatedTo(), so it allows you to do things that the generated Propel getter don't allow:

// Retrieving the related comments, orderd by date
$comments = $commentFinder->
  relatedTo($article)->
  orderBy('CreatedAt', 'desc')->
  find();
// Retrieving the last one of the related comments
$comments = $commentFinder->
  relatedTo($article)->
  findLast();

Compare it to the code required to get these Comment objects without DbFinder, and you will understand all the benefits the relatedTo() method provide.

Tip: Alternatively, a finder can be initialized from an array of Propel object. The resulting SQL query contains a 'IN ()' clause, so use this possibility with caution.

// Retrieving the last one of the related comments
$comments = DbFinder::from($article->getComments())->
  findLast();

Joins

// Test data
$article1 = new Article();
$article1->setTitle('Hello, world!');
$article1->save();
$comment = new Comment();
$comment->setContent('You rock!');
$comment->setArticle($article1);
$comment->save();
 
// Add a join statement
$article = DbFinder::from('Article')->
  join('Comment')->
  where('Comment.Content', 'You rock!')->
  findOne();
// No need to tell the finder which columns to use for the join, just the related Class
// After all, the columns of the FK are already defined in the schema.
// Note that the default join() call results in a SQL INNER JOIN clause
// This is somewhat different from the Propel default, which issues a WHERE clause, but the result is the same
 
// If subsequent conditions use explicit column names,
// The finder can even guess the join table and you can omit the join() statement.
// This is the case here with Comment.Content, so the following also works
$article = DbFinder::from('Article')->
  where('Comment.Content', 'You rock!')->
  findOne();
 
// So join() is mostly useful if you need to specify the members of the join
$article = DbFinder::from('Article')->
  join('Article.Id', 'Comment.ArticleId')->
  where('Comment.Content', 'You rock!')->
  findOne();
 
// Or if you want a special type of join (left, right)
$article = DbFinder::from('Article')->
  leftJoin('Comment')->
  where('Comment.Content', 'You rock!')->
  findOne();
 
// Or both
$article = DbFinder::from('Article')->
  leftJoin('Article.Id', 'Comment.ArticleId')->
  where('Comment.Content', 'You rock!')->
  findOne();
 
// You can chain joins if you want to make more complex queries
$article2 = new Article();
$article2->setTitle('Hello again, world!');
$article2->save();
$author1 = new Author();
$author1->setName('John');
$author1->save();
$comment = new Comment();
$comment->setContent('You rock!');
$comment->setArticle($article2);
$comment->setAuthor($author1);
$comment->save();
 
$article = DbFinder::from('Article')->
  join('Comment')->
  join('Author')->
  where('Author.Name', 'John')->
  findOne();
// In this example, Author.Name allows the finder to guess the last join
// So you can omit it
$article = DbFinder::from('Article')->
  join('Comment')->
  where('Author.Name', 'John')->
  findOne();
 
// You can also use the magic joinXXX() method
$article = DbFinder::from('Article')->
  joinComment()->
  where('Author.Name', 'John')->
  findOne();

Complex logic

// where() and orWhere() only allow simple logical operations on a single condition
// For more complex logic, you have to use combine()
// It expects an array of named conditions to be combined, and an operator
// Use the fourth argument of where() to name a condition
$article = DbFinder::from('Article')->
  where('Title', '=', 'Foo', 'cond1')->     // creates a condition named 'cond1'
  where('Title', '=', 'Bar', 'cond2')->     // creates a condition named 'cond2'
  combine(array('cond1', 'cond2'), 'or')->  // combine 'cond1' and 'cond2' with a logical OR
  findOne();
// SELECT article.* FROM article WHERE (article.TITLE = 'foo' OR article.TITLE = 'bar');
 
// combine accepts more than two conditions at a time
$articles = DbFinder::from('Article')->
  where('Title', '=', 'Foo', 'cond1')->
  where('Title', '=', 'Bar', 'cond2')->
  where('Title', '=', 'FooBar', 'cond3')->
  combine(array('cond1', 'cond2', 'cond3'), 'or')->
  find();
// SELECT article.* FROM article WHERE (article.TITLE = 'foo' OR article.TITLE = 'bar') OR article.TITLE = 'FooBar';
 
// combine() itself can return a named condition to be combined later
// So it allows for any level of logical complexity
$articles = DbFinder::from('Article')->
  where('Title', '=', 'Foo', 'cond1')->
  where('Title', '=', 'Bar', 'cond2')->
  combine(array('cond1', 'cond2'), 'or', 'TitleFooBar')->
  where('PublishedAt', '<=', $end, 'cond3')->
  where('PublishedAt', '>=', $begin, 'cond4')->
  combine(array('cond2', 'cond3'), 'and', 'PublishedInBounds')->
  combine(array('TitleFooBar', 'PublishedInBounds'), 'or')->
  find();
// SELECT article.* FROM article WHERE (
//  (article.TITLE = 'foo' OR article.TITLE = 'bar')
//  OR
//  (article.PUBLISHED_AT <= $end AND article.PUBLISHED_AT >= $begin)
// );

Minimizing queries

Even if you do a Join, Propel or Doctrine will issue new queries when you fetch related objects:

$comment = DbFinder::from('Comment')->
  join('Article')->
  where('Article.Title', 'Hello, world')->
  findOne();
$article = $comment->getArticle();  // Needs another database query

Just as Propel offers generated doSelectJoinXXX() methods, DbFinder allows you to hydrate related objects in a single query - you just have to call the with() method to specify which objects the main object should be hydrated with.

$comment = DbFinder::from('Comment')->
  with('Article')->
  join('Article')->
  where('Article.Title', 'Hello, world')->
  findOne();
$article = $comment->getArticle();  // Same result, with no supplementary query

The power of the with() method is that it can guess relationships just as well as join(), and will add the call to join() if you didn't do it yourself. So you can do for instance:

$category1 = new Category();
$category1->setName('Category1');
$category1->save();
$article1 = new Article();
$article1->setTitle('Hello, world!');
$article1->setCategory($category1);
$article1->save();
$comment = new Comment();
$comment->setContent('foo');
$comment->setArticle($article1);
$comment->save();
 
$comments = DbFinder::from('Comment')->
  with('Article', 'Category')->
  find();      // One single query here
foreach ($comments as $comment)
{
  echo $comment->getArticle()->getCategory()->getName();  // No query needed, the related Article and article Category are already hydrated
}

The with() method can also hydrate the related I18n objects, thus providing an equivalent to symfony's doSelectWithI18n() methods.

// Consider the following schema
//article:
//  title:       varchar(255)
//article_i18n:
//  content:     varchar(255)
$article = new Article();
$article->setTitle('Foo Bar');
$article->setCulture('en');
$article->setContent('english content');
$article->setCulture('fr');
$article->setContent('contenu français');
$article->save();
 
sfContext::getInstance()->getUser()->setCulture('en');
$article = DbFinder::from('Article')->with('I18n')->findOne();
echo $article->getContent();   // english content
sfContext::getInstance()->getUser()->setCulture('fr');
$article = DbFinder::from('Article')->with('I18n')->findOne();
echo $article->getContent();   // contenu français

Note: Since the i18nTable and the is_culture schema properties are lost after Propel model generation, with('I18n') only works if the i18n table is named after the main table (e.g. 'Article' => 'ArticleI18n') and if the culture column name is culture. This is the default symfony behavior, so it should work if you didn't define special i18n table and column names.

Adding columns

If what you need is a single property of a related object, you probably don't need to hydrate the whole related object. For those cases, the finder allows you to add only one column of a related object with withColumn(). You can retrieve supplementary columns added by the finder by calling getColumn() on the resulting objects.

Warning: The withColumn() feature requires symfony's Behavior system. It will only work if you enable behaviors in propel.ini and rebuild your model afterwards.

$article = DbFinder::from('Article')->
  join('Category')->
  withColumn('Category.Name')->
  findOne();
$categoryName = $article->getColumn('Category.Name');  // No supplementary query
 
// Beware that in this case, the related `Category` object is not hydrated, since `with()` was not used.
// That means that retrieving the related `Category` object will issue a new database query,
// so use `withColumn()` only when you need one or two supplementary columns instead of the whole object.
$categoryName = $article->getCategory()->getName();  // One supplementary query
 
// Just like with(), withColumn() adds an internal join if you don't do it yourself
$article = DbFinder::from('Article')->
  withColumn('Category.Name')->
  findOne();
$categoryName = $article->getColumn('Category.Name');  // Works without a call to `join('Category')`
 
// withColumn() can use a column alias as second argument.
$article = DbFinder::from('Article')->
  join('Category')->
  withColumn('Category.Name', 'category')->
  findOne();
$categoryName = $article->getColumn('category');
 
// This is particularly useful if you want to reuse a calculated column for sorting or grouping
$articles = DbFinder::from('Article')->
  join('Comment')->
  withColumn('COUNT(comment.ID)', 'NbComments')->
  orderBy('NbComments')->
  find();
$articles = DbFinder::from('Article')->
  join('Comment')->
  groupBy('Article.Id')->
  withColumn('COUNT(comment.ID)', 'NbComments')->
  find();
 
// Lastly, the supplementary columns added with withColumn() are considered string by default
// But you can force another data type by providing a third argument
$article = DbFinder::from('Article')->
  join('Category')->
  withColumn('Category.CreatedAt', 'CategoryCreatedAt', 'Timestamp')->
  findOne();
$categoryName = $article->getColumn('CategoryCreatedAt');

Counting objects

// Counting all Articles
$nbArticles = DbFinder::from('Article')->count();

Getting a paginated list of results

// Getting an initialized sfPropelPager object
$pager = DbFinder::from('Article')->paginate($currentPage = 1, $maxResultsPerPage = 10);
// You can use the pager object as usual
printf("Showing results %d to %d on %d\n",
  $pager->getfirstIndice(),
  $pager->getLastIndice(),
  $pager->getNbResults());
foreach($pager->getResuts() as $article)
{
  echo $article->getTitle();
}

Deleting objects

// Deleting all Articles
$nbArticles = DbFinder::from('Article')->delete();
// Deleting a selection of Articles
$nbArticles = DbFinder::from('Article')->
  where('Title', 'like', 'foo%')->
  delete();

Updating objects

$article1 = new Article;
$article1->setTitle('foo');
$article1->save();
$article2 = new Article;
$article2->setTitle('bar');
$article2->save();
 
// set() issues an UPDATE ... SET query based on an associative array column => value
DbFinder::from('Article')->
  where('Title', 'foo')->
  set(array('Title' => 'updated title')); // 1
 
// set() returns the number of modified columns
DbFinder::from('Article')->
  where('Title', 'updated title')->
  count(); // 1
 
// Beware that set() updates all records found in a signle row
// And bypasses any behavior registered on the save() hooks
// You can force a one-by-one update by setting the second parameter to true
DbFinder::from('Article')->
  set(array('Title' => 'updated title'), true);
// Beware that it may take a long time

Writing your own business logic into a finder

You can create a new finder for your objects, with custom methods. The only prerequisites are to extend DbFinder, and to define a protected $class property.

For instance, you can create an child of DbFinder to retrieve Propel Article objects. This new finder has access to a protected query object by way of getQueryObject(). This object is a Propel Criteria that can be augmented in the usual way. Don't forget to return the current object ($this) in the new methods.

class ArticleFinder extends DbFinder
{
  protected $class = 'Article';
 
  public function recent()
  {
    return $this->where('CreatedAt', '>=', time() - sfConfig::get('app_recent_days', 5) * 24 * 60 * 60);
  }
}
// You can now use your custom finder and its methods together with the usual ones
$articleFinder = new ArticleFinder();
$articles = $articleFinder->
  recent()->
  orderByTitle()->
  find();

Tip: Once you define an ArticleFinder class, any call to DbFinder::from('Article') will return an instance of ArticleFinder instead of an instance of DbFinder. So the following also works:

$articleFinder = DbFinder::from('Article')->
  recent()->
  orderByTitle()->
  find();

This also means that you can use the finder API to query model objects that are not backed by any ORM at all.

Finding Objects From A Primary Key

$article = DbFinder::from('Article')->findPk(123);
// is equivalent to
$article = ArticlePeer::retrieveByPk(123);
 
// But it's longer to write so what's the point?
// You can hydrate related objects by using with()
// So you need a single query to retrieve an object and its related objects
$article = DbFinder::from('Article')->
  with('Category', 'I18n')->
  findPk(123);
 
// Also works for objects with composite primary keys
$articleI18n = DbFinder::from('ArticleI18n')->findPk(array(123, 'fr'));

Using Class Shortcuts

$article = DbFinder::from('Article a')->
  where('a.Title', 'foo')->
  findOne();
// same as
$article = DbFinder::from('Article')->
  where('Article.Title', 'foo')->
  findOne();

Hacking the finder

If the finder doesn't (yet) provide the method to build the query you need, you can still call Criteria methods on the sfPropelFinder objects, or call Doctrine_Query methods on the sfDoctrineFinder objects, and they will be applied to the finder's internal query object.

$articles = DbFinder::from('Article')->
  where('Title', 'like', 'foo%')->
  addOr(ArticlePeer::TITLE, 'bar%', Criteria::LIKE)-> // that's a Criteria method
  findOne();

If you're not sure about what query is issued by the finder, you can always check the SQL code before executing a termination method by calling getCriteria()->toString(), or after executing a termination method by calling the getLatestQuery() method.

$finder = DbFinder::from('Article')->where('Title', 'foo');
echo $finder->getCriteria()->toString();
// SELECT FROM article WHERE article.TITLE=?
$finder->findOne();
echo $finder->getLatestQuery();
// 'SELECT article.ID, article.VERSION, article.TITLE, article.CATEGORY_ID FROM article WHERE article.TITLE=\'foo\' LIMIT 1'

TODO / Ideas

  • Allow i18n hydration of related objects (#3897)
  • Allow between as a where() operator for simplicity
  • Add a method returning a description of the conditions
  • Add support for withColumn() in array/text output methods
  • Bypass hydration in array/text output methods
  • Handle self-referencing relationships (e.g. parent_id), especially in with()
  • Handle multiple references to the same table (c.f. getFooRelatedByBarId())
  • Implement iterator interface? That way, the query is only executed upon a foreach or an array access... And the finder can be seen as a collection
  • Column finder, which provides an easy interface to Creole (and PDO) for retrieval of columns instead of objects?

Changelog

2008-08-12 | 0.4.0 Beta

  • francois: Renamed the plugin to DbFinder
  • francois: Added finder_methods parameter in generator.yml
  • francois: Implemented not in comparison in sfDoctrineFinder::where()
  • francois: Implemented limit() and offset() in both sfPropelFinder and sfDoctrineFinder
  • francois: sfPropelFinder::join() now defaults to an INNER JOIN instead of a WHERE statement (will facilitate compatibility with Doctrine)
  • francois: Implemented sfDoctrine::combine()
  • francois: Implemented sfDoctrineFinder::orWhere()
  • francois: [BC Break] Removed _and() (synonym for where()) and renamed _or() to orWhere()
  • mrhyde: Fixed problem with sfPropelFinder, symfony cache, and Propel 1.3
  • francois: Refactored DbFinder to allow agnostic finders on model objects to extend it, and to fix problem with lacking PHPDoc on DbFinder methods
  • francois: Added abstract sfModelFinder class to keep all abstract methods out of DbFinder
  • francois: Implemented sfDoctrineFinder::delete()
  • francois: Turned README into Markdown syntax, and changed the main name to DbFinder
  • francois: DbFinder::from('Article') returns an instance of ArticleFinder if it exists. That way, extending the finder gets easier.
  • francois: Added more phpdoc to sfPropelFinder and sfDoctrineFinder
  • mrhyde: Fixed issue when calling several termination methods on a finder
  • francois: Implemented sfDoctrineFinder::count()
  • francois: [BC Break] Replaced sfPropelFinder::setPeerClass() by sfPropelFinder::setClass() (will break classes extending sfPropelFinder)
  • francois: Refactored connection management, query reinitialization, and simplified executers signature
  • francois: Implemented sfDoctrineFinder::fromArray(), and sfDoctrineFinder::getLatestQuery()
  • francois: Added DbFinderAdminGenerator (WIP)
  • francois: Fixed problem with join() and with() when called by children of sfPropelPager
  • windock: Fixed problem with paginate() when called by children of sfPropelPager
  • mrhyde: Added sfPropelFinder::groupByClass() to ease PostgreSQL grouping
  • francois: Fixed problem with table alias and PostgreSQL (based on a patch by mrhyde)
  • mrhyde: Fixed problem with group by clauses being ripped off by pager
  • francois: Implemented DbFinder::toArray(), DbFinder::__toString() and DbFinder::toHtml()
  • francois: Implemented sfDoctrineFinder::findBy(), findOneBy(), findPk(), and initialized where()
  • francois: Added preliminary support for table aliases (from('Article a')) in Doctrine and Propel finders
  • francois: Implemented sfDoctrineFinder::findOne(), findFirst(), findLast() and orderBy()
  • francois: Initialized DbFinder and sfDoctrineFinder (WIP)

2008-07-07 | 0.3.0 Beta

  • francois: Added sfPropelFinder::combine() method to handle complex queries with And and Or
  • francois: Added support for with() in findPk() (and documented the method)
  • francois: Added the ability to do left, right, and inner joins in a simple way
  • francois: Made join() useless if there is an explicit where() on the table afterwards
  • francois: Added a prove.php test file to launch all tests at once in a test harness
  • francois: Moved utility methods as static methods of a third-party class to take some weight off the main class
  • francois: Preferring ClassName.ColumnName over ClassName.ColumnName for complete column names
  • francois: Added Propel 1.3 compatibility
  • francois: Added sfPropelFinder::set() method (based on a patch by jug)
  • francois: Added sfPropelFinder::withI18n() method
  • francois: Added sfPropelFinderPager class and sfPropelFinder::paginate() method
  • francois: Added sfPropelFinder::groupBy() method
  • francois: sfPropelFinder::from() now accepts an array of Propel objects
  • francois: Added sfPropelFinder::findByXXX() and sfPropelFinder::findOneByXXX() methods
  • francois: Added sfPropelFinder::relatedTo() method
  • francois: Added sfPropelFinder::findFirst() and sfPropelFinder::findLast() methods
  • francois: Added sfPropelFinder::withColumn() method
  • jug: Fixed problem in a particular join case
  • francois: Added sfPropelFinder::with() method (based on sfPropelObjectPeerImpersonator::populateObjects() code by hartym)
  • francois: Added support for magic andXXX() and orXXX() methods.
  • jug: Fixed _and() and _or() so that they give expected results, rather than the buggy results of Propel's addAnd() and addOr()

2008-03-31 | 0.2.0 Beta

  • francois: De-emphasized the use of magic methods in the unit tests and README
  • francois: Added sfPropelFinder::_and() and sfPropelFinder::_or() methods
  • francois: Added support for Criteria methods (no more limit to what you can do with a finder!)
  • francois: Added sfPropelFinder::getLatestQuery() method
  • francois: Added sfPropelFinder::delete() method
  • francois: Added sfPropelFinder::joinXXX() method
  • francois: Added sfPropelFinder::join() method
  • francois: Added complete whereClassName_ColumnName() syntax
  • francois: Added sfPropelFinder::count() method

2008-03-27 | 0.1.0 Alpha

  • francois: Initial public release.