Laravel 讓連接不同數據庫以及對數據庫進行增刪改查操作:

參考：http://laravelacademy.org/post/854.html

配置讀寫分離

應用的數據庫配置位于?config/database.php（但是數據庫用戶及密碼等敏感信息位于?.env?文件）。在該文件中你可以定義所有的數據庫連接，并指定哪個連接是默認連接。

'mysql' => ['driver' => 'mysql','read' => ['host' => ['39.107.243.232','39.106.201.242',]],'write' => ['host' => '39.107.243.232'],'port' => env('DB_PORT', '3306'),'database' => env('DB_DATABASE', 'test'),'username' => env('DB_USERNAME', 'root'),'password' => env('DB_PASSWORD', 'aaaa'),'unix_socket' => env('DB_SOCKET', ''),'charset' => 'utf8mb4','collation' => 'utf8mb4_unicode_ci','prefix' => '','strict' => true,'engine' => null,'modes'  => ['ONLY_FULL_GROUP_BY','STRICT_TRANS_TABLES','NO_ZERO_IN_DATE','NO_ZERO_DATE','ERROR_FOR_DIVISION_BY_ZERO','NO_ENGINE_SUBSTITUTION',],
],

Laravel 在讀數據時會從提供的 IP 中隨機選一個進行連接。目前Lavavel5.5讀寫分離僅支持單個寫連接。

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使用不同數據庫連接:

1. 原生SQL：

$id = 2;
$users = DB::connection('mysql::read')->select('select * from users where id = ?',[$id]);
if( empty($users) )
{print("Record is not exist : id =  $id");return;
}
$users = json_decode(json_encode($users),true);
$user = $users[0];
print($user['name']);

$id = 1;
$user['name'] = 'abce21s';
$affected = DB::update('update users set name=? where id=?', [$user['name'],$id]);
if(true != $affected)
{print("Update data failed! : id = $id");return;
}
print('Update data successful!');

$id = 2;
$user['name'] = 'aaaa';
$affected = DB::insert('insert into users (id, name) values (?, ?)', [$id, $user['name']]);
if(true != $affected)
{print("Update data failed! : id = $id");return;
}
print('Update data successful!');

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可以強制寫到讀或者寫的數據庫中：

$id = 1;
$user['name'] = 'ab1s';
$affected = DB::connection('mysql::read')->update('update users set name=? where id=?', [$user['name'],$id]);
if(true != $affected)
{print("Update data failed! : id = $id");return;
}
print('Update data successful!');

$id = 1;
$user['name'] = '111';
$affected = DB::connection('mysql::write')->update('update users set name=? where id=?', [$user['name'],$id]);
if(true != $affected)
{print("Update data failed! : id = $id");return;
}
print('Update data successful!');

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2. 查詢構建器：

$id = 2;
$user['name'] = 'abcde2';
$affected = DB::connection('mysql::read')->table('users')->where('id', $id)->update(['name' => $user['name']]);
if(true != $affected)
{print("Update data failed! : id = $id");return;
}
print('Update data successful!');

$id = 1;
$user['name'] = '222';
$affected = DB::connection('mysql::write')->table('users')->where('id', $id)->update(['name' => $user['name']]);
if(true != $affected)
{print("Update data failed! : id = $id");return;
}
print('Update data successful!');

$id = 2;
$user['name'] = 'bbb';$affected = DB::connection('mysql::write')->table('users')->insert(['id'=> $id, 'name'=>$user['name']]);
if(true != $affected)
{print("Update data failed! : id = $id");return;
}
print('Update data successful!');

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3. Eloquent ORM

參考：https://docs.golaravel.com/docs/5.5/eloquent/

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http://laravelacademy.org/post/8060.html