ThinkPHP6企业级实战：构建智能多租户SaaS平台

一、系统架构设计

租户识别 → 动态配置 → 数据隔离 → 路由分发 → 服务共享

二、核心功能实现

1. 租户识别中间件

namespace appmiddleware;

class TenantIdentify
{
    public function handle($request, Closure $next)
    {
        // 从子域名识别租户
        $subDomain = explode('.', $request->host())[0];
        
        // 从数据库验证租户
        $tenant = appmodelTenant::where('domain', $subDomain)->find();
        
        if (!$tenant) {
            return json(['code' => 404, 'msg' => '租户不存在']);
        }

        // 设置租户上下文
        appcommonTenantContext::setTenant($tenant);
        
        return $next($request);
    }
}

2. 动态数据库切换

namespace appcommon;

class TenantDatabase
{
    public static function switch($tenant)
    {
        // 每个租户独立数据库
        $config = [
            'type'        => 'mysql',
            'hostname'    => '127.0.0.1',
            'database'    => 'tenant_' . $tenant->id,
            'username'    => 'root',
            'password'    => '',
            'charset'     => 'utf8mb4',
        ];

        // 动态修改配置
        thinkfacadeDb::connect($config);
    }
}

3. 数据范围控制

namespace appmodel;

use thinkModel;

class BaseModel extends Model
{
    protected function scopeTenant($query)
    {
        $tenantId = appcommonTenantContext::getTenantId();
        $query->where('tenant_id', $tenantId);
    }
}

// 使用示例
class Product extends BaseModel
{
    // 自动应用租户范围
    public static function onBeforeQuery($query)
    {
        $query->tenant();
    }
}

三、高级功能实现

1. 租户路由优化

// route/tenant.php
Route::domain(':subdomain', function() {
    Route::get('/', 'index/hello');
    Route::resource('product', 'Product');
    Route::resource('order', 'Order');
})->middleware(TenantIdentify::class);

// 动态注册租户路由
$tenants = appmodelTenant::select();
foreach ($tenants as $tenant) {
    Route::domain($tenant->domain . '.saas.com', function() use ($tenant) {
        // 租户自定义路由
    });
}

2. 共享数据缓存隔离

namespace appcommon;

class TenantCache
{
    public static function get($name)
    {
        $tenantId = TenantContext::getTenantId();
        return thinkfacadeCache::get($tenantId . '_' . $name);
    }

    public static function set($name, $value, $expire = null)
    {
        $tenantId = TenantContext::getTenantId();
        thinkfacadeCache::set($tenantId . '_' . $name, $value, $expire);
    }
}

四、实战案例演示

1. 租户管理后台

namespace appcontrolleradmin;

class Tenant extends Base
{
    public function create()
    {
        $data = request()->post();
        
        // 创建租户数据库
        $this->createTenantDatabase($data['database']);
        
        // 初始化基础数据
        $this->initTenantData($data);
        
        return json(['code' => 200, 'msg' => '创建成功']);
    }
    
    private function createTenantDatabase($dbName)
    {
        $sql = "CREATE DATABASE IF NOT EXISTS `{$dbName}` DEFAULT CHARACTER SET utf8mb4";
        Db::execute($sql);
    }
}