Laravel provides DB facade (original search), query builder, Eloquent ORM three ways to operate the database
1. Connect to the database
.env database configuration
DB_HOST=localhost dbhost
DB_DATABASE=laravel dbname
DB_USERNAME=root username
DB_PASSWORD=root password
2. Use DB facade to implement CURD
(1) Create a new route
Route::get('city', 'cityController@index');
(2) Create a new controller and query it directly in the controller
namespace App\Http\Controllers;
use Illuminate\Support\Facades\DB;
class CityController extends Controller {
public function index() {
$insert = DB::insert('insert into city set name="安徽",state="init"');
Added: return bool
$delete = DB::delete('delete from city where id > 5');
delete: returns the number of rows deleted
$update = DB::update('update city set name = "上海" where id = 8');
Change: return the number of rows updated
$city = DB::select('select * from city');
Check: return an array
}
}
3. Use the query builder to implement CURD
(1) Add:
$insert_bool = DB::table('city')->insert(['name' => '湖南', 'state' => 'init']);
Insert a piece of data and return a bool value
$insert_id = DB::table('city')->insertGetId(['name' => '湖北', 'state' => 'init']);
Insert a piece of data and return the inserted record id
$insert_bool = DB::table('city')->insert([['name' => '北京', 'state' => 'init'], ['name' => '上海', 'state' => 'init']]);
Insert multiple pieces of data and return bool value
(2) delete:
$delete_row = DB::table('city')->where('id', 14)->delete();
Delete a record, return the number of rows affected, 1 row
$delete_table = DB::table('city')->truncate();
Empty a table without returning any flags
(3) Change:
$update_row = DB::table('city')->where('id', 20)->update(['name' => '日本']);
Update a piece of data to return the number of rows affected, 1 row
$update_row = DB::table('carousel')->increment('order_number');
Let the order_number of all records be incremented by 1, and return the number of affected rows, 6 rows
$update_row = DB::table('carousel')->decrement('order_number');
Let the order_number of all records be decremented by 1, and return the number of affected rows, 6 rows
$update_row = DB::table('carousel')->increment('order_number', 100);
Let the order_number of all records be incremented by 100, and return the number of affected rows, 6 rows
$update_row = DB::table('carousel')->decrement('order_number', 100);
Let the order_number of all records be decremented by 100, and return the number of affected rows, 6 rows
$update_row = DB::table('carousel')->where('id', 1)->increment('order_number', 200);
Modify the order_number field with a record id of 1 to increment by 200, and return the number of affected rows, 1 row
$update_row = DB::table('carousel')->where('id', 1)->increment('order_number', 200, ['name' => 'Auto-increment and modify fields']);
Modify the order_number field with a record id of 1 to increment by 200, and modify other fields at the same time, and return the number of affected rows, 1 row
(4) Check:
$select_rows = DB::table('city')->get();
get method to query all records
$first_row = DB::table('carousel')->orderBy('id', 'asc')->first();
The first method queries the first item after sorting
$select_rows = DB::table('carousel')->where('id', '>=', 2)->get();
where method queries all records that meet a single condition
$select_rows = DB::table('carousel')->whereRaw('id >= ? and order_number > ?', [1, 5])->get();
whereRaw method to query all records that meet multiple conditions
$select_field = DB::table('carousel')->pluck('name');
The pluck method queries the name field of each record that meets the conditions
$select_field = DB::table('carousel')->lists('name');
$select_field = DB::table('carousel')->lists('name', 'id_code');
The lists method queries the name field of each record that meets the conditions (or query the name field of each record that meets the conditions with id_code as the key name)
$select_field = DB::table('carousel')->select('id','id_code','name')->get();
The select method queries the specified field of each record that meets the conditions
DB::table('user_log')->chunk(10, function($number){
var_dump($number);
if(???) return false;
});
The chunk method queries a fixed record each time according to the conditions, and the internal callback function can control the process, and can return false when a certain condition is met
dd($select_field);
(5) Aggregation function:
$count = DB::table('city')->count();
Count the total number of records
$max = DB::table('user_log')->max('id');
find the maximum value
$min = DB::table('user_log')->min('id');
find the minimum value
$avg = DB::table('user_log')->avg('id');
average
$sum = DB::table('user_log')->sum('user_id');
sum
dd($sum);
4. Implement CURD using Eloquent ORM
Introduction: The Eloquent ORM that comes with laravel is a beautiful and concise ActiveRecord implementation used to implement database operations. Each data table has a corresponding model model for interacting with the data table.
1) Introduction, model establishment and query data:
routing:
Route::any('orm1', ['uses' => 'CityController@orm1']);
Controller:
namespace App\Http\Controllers;
use App\City;
class CityController extends Controller
{
public function orm1()
{
(1) The all method queries all records
$city = City::all();
(2) The find method queries a single record based on the primary key id
$city = City::find(1);
(3) The findOrFail method queries a single record according to the primary key id, and reports an exception if the query fails
$city = City::findOrFail(1);
(4) The get method queries all records
$city = City::get();
(5) The first method queries the first record
$city = City::where('id', '>', 1)->orderBy('id', 'desc')->first();
(6) The chunk method records a fixed number of records per query
City::chunk(1, function ($number) {
var_dump($number);
});
(7) count() method to find the total number of records
$count = City::count();
(8) max() method to find the maximum value
$max = City::where('id', '>', 1)->max('parent_id');;
}
}
Model:
namespace App;
use Illuminate\Database\Eloquent\Model;
class City extends Model
{
protected $table = 'city'; // Specify the table name to associate with the model
protected $primaryKey = 'id'; // Specify the primary key, the default is id can not be written
}
2) Add data, use custom timestamps and batch assignment:
routing:
Route::any('orm1', ['uses' => 'CityController@orm1']);
Controller:
namespace App\Http\Controllers;
use App\City;
class CityController extends Controller
{
public function orm1()
{
// add data, save data
$city = new City();
$city->name = '123456';
$city->state = 'init';
$bool = $city->save();
dd($bool);
// Use the create method of the model to add data
$city = City::create(['name' => '南通', 'state' => 'init']);
dd($city);
// Query data by attribute, if not, create it
$city = City::firstOrCreate(['name' => '南通']);
// Query data by attributes, if not, create it, but you need to use save to save it
$city = City::firstOrNew(['name' => 'Nantong ssss']);
$city->save();
dd($city);
}
}
Model:
namespace App;
use Illuminate\Database\Eloquent\Model;
class City extends Model
{
protected $table = 'city'; // Specify the table name to associate with the model
protected $primaryKey = 'id'; // Specify the primary key, the default is id can not be written
public $timestamps = false; // Turn off automatic maintenance of timestamps (if changed to true, you need to manually add created_at and updated_at fields in advance, and the time at this time is in datetime format)
protected function getDateFormat() // This method can change the datetime type of the created_at and updated_at fields to the timestamp format
{
return time();
}
protected function asDateTime($value) // Do not format the time taken out
{
return $value;
}
}
3) Modify the data using Eloquent ORM:
routing:
Route::any('orm1', ['uses' => 'CityController@orm1']);
Controller:
namespace App\Http\Controllers;
use App\City;
class CityController extends Controller
{
public function orm1()
{
//update data through model
$city = City::find(9);
$city->name = 'Suzhou';
$bool = $city->save();
var_dump($bool);
//Update data in batches and return the number of updated bars
$update_rows = City::where('id', '>', 2)->update(['parent_id' => 10]);
var_dump($update_rows);
}
}
Model:
namespace App;
use Illuminate\Database\Eloquent\Model;
class City extends Model
{
protected $table = 'city'; // Specify the table name to associate with the model
protected $primaryKey = 'id'; // Specify the primary key, the default is id can not be written
public $timestamps = false; // Turn off automatic maintenance of timestamps (if changed to true, you need to manually add created_at and updated_at fields in advance, and the time at this time is in datetime format)
protected function getDateFormat() // This method can change the datetime type of the created_at and updated_at fields to the timestamp format
{
return time();
}
protected function asDateTime($value) // Do not format the time taken out
{
return $value;
}
}
4) Delete data using Eloquent ORM:
routing:
Route::any('orm1', ['uses' => 'CityController@orm1']);
Controller:
namespace App\Http\Controllers;
use App\City;
class CityController extends Controller
{
public function orm1()
{
// delete by model
$city = City::find(9);
$bool = $city->delete();
var_dump($bool);
//Delete by primary key, return the number of deleted items
$delete_rows = City::destroy(8);
$delete_rows = City::destroy(6, 7);
$delete_rows = City::destroy([6, 7]);
var_dump($delete_rows);
//Delete by the specified condition, return the number of deleted items
$delete_rows = City::where('id', '>', 2)->delete();
var_dump($delete_rows);
}
}
Model:
namespace App;
use Illuminate\Database\Eloquent\Model;
class City extends Model
{
protected $table = 'city'; // Specify the table name to associate with the model
protected $primaryKey = 'id'; // Specify the primary key, the default is id can not be written
public $timestamps = false; // Turn off automatic maintenance of timestamps (if changed to true, you need to manually add created_at and updated_at fields in advance, and the time at this time is in datetime format)
protected function getDateFormat() // This method can change the datetime type of the created_at and updated_at fields to the timestamp format
{
return time();
}
protected function asDateTime($value) // Do not format the time taken out
{
return $value;
}
}
5) Multiple database connections:
The .env file is configured as follows:
DB_HOST=127.0.0.1
DB_DATABASE=dearedu
DB_USERNAME=root
DB_PASSWORD=root
DB_HOST_DEAREDU_MY=127.0.0.1
DB_PORT_DEAREDU_MY=3306
DB_DATABASE_DEAREDU_MY=dearedu_my
DB_USERNAME_DEAREDU_MY=root
DB_PASSWORD_DEAREDU_MY=root
The config\database.php file is configured as follows:
'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', 'forge'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', 'forge'),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
],
'mysql_dearedu_my' => [
'driver' => 'mysql',
'host' => env('DB_HOST_DEAREDU_MY', 'forge'),
'port' => env('DB_PORT_DEAREDU_MY', '3306'),
'database' => env('DB_DATABASE_DEAREDU_MY', 'forge'),
'username' => env('DB_USERNAME_DEAREDU_MY', 'forge'),
'password' => env('DB_PASSWORD_DEAREDU_MY', 'forge'),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
'engine' => null,
],
The app\Http\Controllers\MemberController.php file is configured as follows:
namespace App\Http\Controllers;
use App\Member;
class MemberController extends Controller
{
public function index()
{
$members = Member::getMember();
}
}
The app\Member.php file is configured as follows:
namespace App;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;
class Member extends Model
{
public static function getMember()
{
return DB::select("select mid from cms_member");
}
}
The app\Http\Controllers\IndexController.php file is configured as follows:
namespace App\Http\Controllers;
use App\Unit;
class IndexController extends Controller
{
public function index()
{
$units = Unit::getUnit();
}
}
The app\Unit.php file is configured as follows:
namespace App;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;
class Unit extends Model
{
public static function getUnit()
{
return DB::connection('mysql_dearedu_my')->select("select id from my_config_unit limit 5");
}
}
Three ways for Laravel to connect to the database and operate the database
Guess you like
Origin http://43.154.161.224:23101/article/api/json?id=324892350&siteId=291194637
Recommended
Ranking