Lumen作为一款API导向很浓的框架，配置极简化，默认只支持一路DB配置
然而随着业务复杂度的提高，引入多个数据库连接似乎无法避免，下面介绍一下LUMEN连接多个数据库的配置方法：
- 修改.env文件，增加新DB配置，如下：
//DB1 配置 DB_CONNECTION=mysql DB_HOST=127.0.0.1 DB_PORT=3306 DB_DATABASE=dbname DB_USERNAME=dbname DB_PASSWORD=password DB_TIMEOUT=4 //DB2配置 DB_TEST_CONNECTION=mysql DB_TEST_HOST=127.0.0.1 DB_TEST_PORT=3307 DB_TEST_DATABASE=dbname2 DB_TEST_USERNAME=dbname2 DB_TEST_PASSWORD=password DB_TEST_TIMEOUT=4
- 因为LUMEN在加载DB配置时，还是会默认去laravel模块下寻找相关配置文件，这时修改laravel模块下的database.php文件
文件位置在:
./vendor/laravel/lumen-framework/config/database.php
添加.env文件中新增的DB配置，如下：
//默认配置 'mysql' => [ 'driver' => 'mysql', 'host' => env('DB_HOST', 'localhost'), 'port' => env('DB_PORT', 3306), 'database' => env('DB_DATABASE', 'forge'), 'username' => env('DB_USERNAME', 'forge'), 'password' => env('DB_PASSWORD', ''), 'charset' => env('DB_CHARSET', 'utf8'), 'collation' => env('DB_COLLATION', 'utf8_unicode_ci'), 'prefix' => env('DB_PREFIX', ''), 'timezone' => env('DB_TIMEZONE', '+00:00'), 'strict' => env('DB_STRICT_MODE', false), ], //新增配置 'mysql_test'=>[ 'driver' => 'mysql', 'host' => env('DB_TEST_HOST', 'localhost'), 'port' => env('DB_TEST_PORT', 3306), 'database' => env('DB_TEST_DATABASE', 'forge'), 'username' => env('DB_TEST_USERNAME', 'forge'), 'password' => env('DB_TEST_PASSWORD', ''), 'charset' => env('DB_CHARSET', 'utf8'), 'collation' => env('DB_COLLATION', 'utf8_unicode_ci'), 'prefix' => env('DB_PREFIX', ''), 'timezone' => env('DB_TIMEZONE', '+00:00'), 'strict' => env('DB_STRICT_MODE', false), ],
- 在项目中调用时，直接按database.php中的做法初始化connection就行，如下：
$query = app('db')->connection("mysql_test")->select("...");
