1, in-depth understanding Laravel eloquent (a)--basic concepts and usage

Eloquent basic usage

Find an article with ID 2 to print its title

$article = Article::find (2); Echo $article->title;

Find the article titled "I am title" and print the ID

$article = Article::where (' title ', ' I am the title ')->first (); Echo $article->id;

Check out all the articles and cycle through all the headings

$articles = Article::all (); The $articles obtained here is a collection of objects, which can be appended with '->toarray () ' to become multidimensional arrays. foreach ($articles as $article) {     echo $article->title;}

Find all the articles in 10~20 between IDs and print all titles

$articles = article::where (' id ', ' > ', ten)->where (' id ', ' < ', ')->get (); foreach ($articles as $article) {         echo $article->title;}

Check out all the articles and cycle through all the headings, sorted in reverse order Updated_at

$articles = article::where (' id ', ' > ', ten)->where (' id ', ' < ', ')->orderby (' Updated_at ', ' desc ')->get (); foreach ($articles as $article) {     echo $article->title;}

Basic use Points

1. Each class that inherits the eloquent has two ' fixed usage ' article::find () ' Article::all () ', which gets an object with the values taken out of the database, which gets a collection of objects containing the entire database.

2. All intermediate methods such as ' Where () ' () ' () ' are able to support both ' static ' and ' non-static chaining ' methods, i.e. ' article::where (... ') and ' Article::....->where () '.

3. All ' non-fixed usage ' calls end up with an action to ' close ', with two ' finishing touches ' in this tutorial: '->get () ' and '->first '.

4. If you do not understand why the ' article ' class can use many methods such as '->where (') '->get () ', you need to read the document inherited by the PHP object: Object inheritance.

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