Allow connecting to read or write connections with the db command (#37548)

Author: themsaid

src/Illuminate/Database/Console/DbCommand.php

@@ -14,7 +14,9 @@ class DbCommand extends Command
      *
      * @var string
      */
-    protected $signature = 'db {connection? : The database connection that should be used}';
+    protected $signature = 'db {connection? : The database connection that should be used}
+               {--read : Connect to the read connection}
+               {--write : Connect to the write connection}';
 
     /**
      * The console command description.
@@ -64,6 +66,12 @@ public function getConnection()
             $connection = (new ConfigurationUrlParser)->parseConfiguration($connection);
         }
 
+        if ($this->option('read')) {
+            $connection = array_merge($connection, $connection['read']);
+        } elseif ($this->option('write')) {
+            $connection = array_merge($connection, $connection['write']);
+        }
+
         return $connection;
     }