laravel implements multi-condition query

As a popular PHP development framework, Laravel has won the favor of many developers. In actual development, many scenarios require multi-condition queries on the database. At this time, Laravel provides many convenient methods for processing. This article will introduce how to use Laravel to implement multi-condition queries.

Basic knowledge

Before introducing the specific implementation methods, we need to understand some basic concepts.

1. Query builder: Laravel's query builder provides a convenient and fluent interface to operate the database. The query builder supports simple where conditions, sorting, grouping, aggregation, and more.
2. Eloquent ORM: In Laravel, Eloquent ORM is an object-relational mapping (ORM) implementation of the database. It provides simple methods to manipulate database tables.

Query Builder

Laravel's query builder provides a variety of query methods, including where, orWhere, whereIn, whereNotIn, whereBetween, whereNotBetween and so on. Among them, where and orWhere are the most commonly used methods.

Use the where method to query based on specified conditions. The sample code is as follows:

$users = DB::table('users')->where('name', 'John')->get();

The above code will query all users named John from the users table.

Use the orWhere method to add one or more "or" conditions. The sample code is as follows:

$users = DB::table('users')
            ->where('name', 'John')
            ->orWhere('name', 'Jane')
            ->get();

The above code will query all users named John or Jane from the users table.

In addition to the where and orWhere methods, the Laravel query builder also provides a variety of other query methods, which will not be described one by one here. For more details, see Laravel official documentation.

Eloquent ORM

Eloquent ORM is an object-relational mapping (ORM) implementation of Laravel that allows us to use PHP objects instead of SQL statements to operate database tables.

To use Eloquent ORM to query, you need to define a model first. The sample code is as follows:

namespace App;

use IlluminateDatabaseEloquentModel;

class User extends Model
{
    protected $table = 'users';
}

In the above code, the database table corresponding to the User model is users.

After defining the model, we can use Eloquent ORM to perform multi-condition queries. The sample code is as follows:

$users = User::where('name', 'John')
             ->orWhere('name', 'Jane')
             ->get();

The above code will query all users named John or Jane from the users table, in the same way as using the query builder.

In addition to the where and orWhere methods, Eloquent ORM also provides a variety of other query methods, which will not be detailed here. For more details, see Laravel official documentation.

Multi-condition query example

In actual development, we often need to perform multi-condition query. The following takes a simple user query as an example to introduce how to use Eloquent ORM to implement multi-condition query.

Suppose we have a users table with the following fields:

• id
• name
• email
• age
• gender

We need to query all users who meet the following conditions:

• gender is male
• aged between 20 and 30 years old Room
• The name starts with "J"
• The email ends with "@example.com"

Using Eloquent ORM can be implemented as follows:

$users = User::where('gender', 'male')
             ->whereBetween('age', [20, 30])
             ->where('name', 'like', 'J%')
             ->where('email', 'like', '%@example.com')
             ->get();

The above code first uses the where method to filter out users whose gender is male, then uses the whereBetween method to filter out users whose age is between 20 and 30 years old, then uses the where method to filter out users whose names start with "J", and finally uses where The method filters out users whose mailboxes end with "@example.com", and packages all users who meet the conditions into a set and returns it.

Summary

Multi-condition query is a common requirement in development. In Laravel, we can use the query builder or Eloquent ORM to implement multi-condition query. The query builder provides a variety of query methods that can be selected according to specific needs; Eloquent ORM can use methods similar to object methods to perform multi-condition queries. Of course, which method to use depends on the specific situation and personal preference. No matter which method is used, we can easily implement multi-condition queries.

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