国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Home php教程 PHP開發(fā) Laravel framework database CURD operation and usage of coherent operation

Laravel framework database CURD operation and usage of coherent operation

Nov 22, 2016 pm 12:40 PM
laravel

Laravel framework database CURD operation, how to use coherent operation
Laravel framework database CURD operation, how to operate coherently. This operability is very convenient and simple. We are here to introduce you to a related tutorial. The specific detailed steps are as follows Text introduction.
Laravel is a simple and elegant PHP Web development framework (PHP Web Framework). It can free you from messy codes like noodles; it can help you build a perfect network APP, and every line of code can be concise and expressive.
1. Selects
Retrieve all rows in the table
$users = DB::table('users')->get();
foreach ($users as $user)
{
var_dump($user-> name);
}
Retrieve a single row from a table
$user = DB::table('users')->where('name', 'John')->first();
var_dump($user- >name);
Retrieve rows for a single column
$name = DB::table('users')->where('name', 'John')->pluck('name');
Retrieve a Column value list
$roles = DB::table('roles')->lists('title');
This method will return the role of an array title. You can also specify a custom key column to return the array
$roles = DB::table('roles')->lists('title', 'name');

Specify a Select clause
$users = DB::table('users')->select('name', 'email')->get();
$users = DB::table('users')->distinct()- >get();
$users = DB::table('users')->select('name as user_name')->get();
Select clause is added to an existing query
$ query = DB::table('users')->select('name');
$users = $query->addSelect('age')->get();
where
$users = DB ::table('users')->where('votes', '>', 100)->get();
OR
$users = DB::table('users')->where ('votes', '>', 100)->orWhere('name', 'John')->get();

Where Between
$users = DB::table('users')- >whereBetween('votes', array(1, 100))->get();

Where Not Between
$users = DB::table('users')->whereNotBetween('votes', array (1, 100))->get();

Where In With An Array
$users = DB::table('users')->whereIn('id', array(1, 2, 3) )->get();
$users = DB::table('users')->whereNotIn('id', array(1, 2, 3))->get();

Using Where Null To Find Records With Unset Values
$users = DB::table('users')->whereNull('updated_at')->get();

Order By, Group By, And Having
$users = DB::table('users')->orderBy('name', 'desc')->groupBy('count')->having('count', '>', 100)-> get();
Offset & Limit
$users = DB::table('users')->skip(10)->take(5)->get();
2. Connection
Joins
query Builders can also be used to write join statements. Take a look at the following example:
DB::table('users')
->join('contacts', 'users.id', '=', 'contacts.user_id')
->join('orders ', 'users.id', '=', 'orders.user_id')
->select('users.id', 'contacts.phone', 'orders.price')
->get();
Left join statement
DB::table('users')
->leftJoin('posts', 'users.id', '=', 'posts.user_id')
->get();
DB ::table('users')
->join('contacts', function($join)
{
$join->on('users.id', '=', 'contacts.user_id')- >orOn(...);
})
->get();
DB::table('users')
->join('contacts', function($join)
{
$join ->on('users.id', '=', 'contacts.user_id')
->where('contacts.user_id', '>', 5);
})
->get( );

3. Grouping
Sometimes, you may need to create more advanced where clauses, such as "exists" or nested parameter grouping. Laravel query builder can handle these:
DB::table('users')
->where('name', '=', 'John')
->orWhere(function($query)
{
$ query->where('votes', '>', 100)
->where('title', '<>', 'Admin');
})
->get();

The above query will produce the following SQL:
select * from users where name = 'John' or (votes > 100 and title
<> 'Admin')
Exists Statements
DB::table('users' )
->whereExists(function($query)
{
$query->select(DB::raw(1))
->from('orders')
->whereRaw('orders.user_id = users.id');
})
->get ();
The above query will generate the following SQL:
select * from userswhere exists (
select 1 from orders where orders.user_id = users.id
)

Four. Aggregation
The query builder also provides various aggregation methods , such as statistics, max, min, avg and sum.
$users = DB::table('users')->count();
$price = DB::table('orders')->max('price');
$price = DB:: table('orders')->min('price');
$price = DB::table('orders')->avg('price');
$total = DB::table('users ')->sum('votes');
Raw Expressions
Sometimes you may need to use a raw expression query. These expressions will be injected into the query string, so be careful not to create any SQL injection points! To create a raw expression, you can use DB:rawmethod:
Using A Raw Expression
$users = DB::table('users')
->select(DB::raw('count(*) as user_count, status'))
->where('status', '<>', 1)
->groupBy('status' )
->get();

Increment or decrement the value of a column

DB::table('users')->increment('votes');
DB::table('users')- >increment('votes', 5);
DB::table('users')->decrement('votes');
DB::table('users')->decrement('votes', 5);

You can also specify additional column updates:

DB::table('users')->increment('votes', 1, array('name' => 'John'));

Inserts
Insert records into the table
DB::table('users')->insert(
array('email' => 'john@example.com', 'votes' => 0)
) ;

Inserting records into a table with auto-incrementing ID
If the table, has an auto-incrementing id field use insertGetId to insert a record and retrieve the id:

$id = DB::table(&#39;users&#39;)->insertGetId(
array(&#39;email&#39; => &#39;john@example.com&#39;, &#39;votes&#39; => 0)
);


Note: When using the PostgreSQL insertGetId method it is expected that the auto-incrementing column will be named is "id".
Multiple records are inserted into the table
The code is as follows:
DB::table('users')->insert(array(
array('email' => 'taylor@example.com', 'votes' = > 0),
array('email' => 'dayle@example.com', 'votes' => 0),
));

4. Updates
Update records in a table
The code is as follows :
DB::table('users')
->where('id', 1)
->update(array('votes' => 1));

5. Deletes
Delete the table The record
code is as follows:
DB::table('users')->where('votes', '<', 100)->delete();

Delete all records in the table
The code is as follows :
DB::table('users')->delete();
Delete a table

The code is as follows:

DB::table('users')->truncate();

6. Unions
The query builder also provides a quick way to "union" two queries:

The code is as follows:
$first = DB::table('users')->whereNull('first_name');
$ users =
DB::table('users')->whereNull('last_name')->union($first)->get();

unionAll method is also available and has the same method signature.
Pessimistic Locking
The query builder includes some "pessimistic locking" features to help you with your SELECT statements. Run the SELECT statement "Shared Lock", you can use the sharedLock method to query:
The code is as follows:
DB::table('users')->where('votes', '>',
100)->sharedLock ()->get();
Update "lock" in a SELECT statement, you can use the lockForUpdate method to query:

The code is as follows:

DB::table('users')->where('votes' , '>', 100)->lockForUpdate()->get();

7. Cache query
You can easily cache the results of the query using mnemonics:
The code is as follows:
$users = DB: :table('users')->remember(10)->get();
In this example, the results of the query will be cached for ten minutes. When query results are cached, they are not run against the database and the results will be loaded from the default cache driver specified by your application. If you are using a driver that supports caching, you can also add tags to cache:

The code is as follows:

$users = DB::table('users')->cacheTags(array('people', 'authors' ))->remember(10)->get();


Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to test Laravel API interface? How to test Laravel API interface? May 22, 2025 pm 09:45 PM

Efficient methods for testing Laravel API interfaces include: 1) using Laravel's own testing framework and third-party tools such as Postman or Insomnia; 2) writing unit tests, functional tests and integration tests; 3) emulating a real request environment and managing database status. Through these steps, the stability and functional integrity of the API can be ensured.

How to customize Laravel's user authentication logic? How to customize Laravel's user authentication logic? May 22, 2025 pm 09:36 PM

Custom Laravel user authentication logic can be implemented through the following steps: 1. Add additional verification conditions when logging in, such as mailbox verification. 2. Create a custom Guard class and expand the authentication process. Custom authentication logic requires a deep understanding of Laravel's authentication system and pay attention to security, performance and maintenance.

Laravel integration with social media login (OAuth) Laravel integration with social media login (OAuth) May 22, 2025 pm 09:27 PM

Integrating social media login in the Laravel framework can be achieved by using the LaravelSocialite package. 1. Install the Socialite package: use composerrequirelaravel/socialite. 2. Configure the service provider and alias: add relevant configuration in config/app.php. 3. Set API credentials: Configure social media API credentials in .env and config/services.php. 4. Write controller method: Add redirection and callback methods to handle social media login process. 5. Handle FAQs: Ensure user uniqueness, data synchronization, security and error handling. 6. Optimization practice:

How to create Laravel package (Package) development? How to create Laravel package (Package) development? May 29, 2025 pm 09:12 PM

The steps to create a package in Laravel include: 1) Understanding the advantages of packages, such as modularity and reuse; 2) following Laravel naming and structural specifications; 3) creating a service provider using artisan command; 4) publishing configuration files correctly; 5) managing version control and publishing to Packagist; 6) performing rigorous testing; 7) writing detailed documentation; 8) ensuring compatibility with different Laravel versions.

Common security threats and protection measures for Laravel applications Common security threats and protection measures for Laravel applications May 22, 2025 pm 09:33 PM

Common security threats in Laravel applications include SQL injection, cross-site scripting attacks (XSS), cross-site request forgery (CSRF), and file upload vulnerabilities. Protection measures include: 1. Use EloquentORM and QueryBuilder for parameterized queries to avoid SQL injection. 2. Verify and filter user input to ensure the security of output and prevent XSS attacks. 3. Set CSRF tokens in forms and AJAX requests to protect the application from CSRF attacks. 4. Strictly verify and process file uploads to ensure file security. 5. Regular code audits and security tests are carried out to discover and fix potential security vulnerabilities.

How to implement password reset function in Laravel? How to implement password reset function in Laravel? May 22, 2025 pm 09:42 PM

Implementing password reset function in Laravel requires the following steps: 1. Configure the email service and set relevant parameters in the .env file; 2. Define password reset routes in routes/web.php; 3. Customize email templates; 4. Pay attention to email sending problems and the validity period of tokens, and adjust the configuration if necessary; 5. Consider security to prevent brute-force attacks; 6. After the password reset is successful, force the user to log out of other devices.

What is Middleware in Laravel? How to use it? What is Middleware in Laravel? How to use it? May 29, 2025 pm 09:27 PM

Middleware is a filtering mechanism in Laravel that is used to intercept and process HTTP requests. Use steps: 1. Create middleware: Use the command "phpartisanmake:middlewareCheckRole". 2. Define processing logic: Write specific logic in the generated file. 3. Register middleware: Add middleware in Kernel.php. 4. Use middleware: Apply middleware in routing definition.

Sensitive data protection policies in Laravel Sensitive data protection policies in Laravel May 22, 2025 pm 09:30 PM

Laravel provides a variety of strategies to ensure data security: 1. Use Cryptfacade to encrypt data to protect sensitive information. 2. Enable access control through authorization policies (AuthorizationPolicies) to prevent data leakage. 3. Adjust logging policy and use log rotation to avoid sensitive data leakage.

See all articles