Laravel 让连接不同数据库以及对数据库进行增删改查操作:

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

配置读写分离

应用的数据库配置位于 config/database.php（但是数据库用户及密码等敏感信息位于 .env 文件）。在该文件中你可以定义所有的数据库连接，并指定哪个连接是默认连接。

'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 在读数据时会从提供的 IP 中随机选一个进行连接。目前Lavavel5.5读写分离仅支持单个写连接。

 

使用不同数据库连接:

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!');

 

可以强制写到读或者写的数据库中：

$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!');

 

2. 查询构建器：

$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!');

 

3. Eloquent ORM

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

 

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