diff --git a/library/think/console/command/optimize/Schema.php b/library/think/console/command/optimize/Schema.php
index 7ed6d1e7..a1f40cd9 100644
--- a/library/think/console/command/optimize/Schema.php
+++ b/library/think/console/command/optimize/Schema.php
@@ -72,7 +72,6 @@ class Schema extends Command
             $output->writeln('<info>Succeed!</info>');
             return;
         } else {
-            $dbName = Db::getConfig('database');
             $tables = Db::getTables();
         }
 
@@ -97,11 +96,16 @@ class Schema extends Command
 
     protected function buildDataBaseSchema($tables, $db)
     {
+        if ('' == $db) {
+            $dbName = Db::getConfig('database') . '.';
+        } else {
+            $dbName = $db;
+        }
         foreach ($tables as $table) {
             $content = '<?php ' . PHP_EOL . 'return ';
             $info    = Db::getFields($db . $table);
             $content .= var_export($info, true) . ';';
-            file_put_contents(RUNTIME_PATH . 'schema' . DS . $db . $table . EXT, $content);
+            file_put_contents(RUNTIME_PATH . 'schema' . DS . $dbName . $table . EXT, $content);
         }
     }
 }
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 7cb5bcf5..637b0bc5 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -1341,13 +1341,15 @@ class Query
         }
 
         list($guid) = explode(' ', $tableName);
-        if (!strpos($guid, '.')) {
-            $guid = $this->getConfig('database') . '.' . $guid;
-        }
         if (!isset(self::$info[$guid])) {
+            if (!strpos($guid, '.')) {
+                $schema = $this->getConfig('database') . '.' . $guid;
+            } else {
+                $schema = $guid;
+            }
             // 读取缓存
-            if (is_file(RUNTIME_PATH . 'schema/' . $guid . '.php')) {
-                $info = include RUNTIME_PATH . 'schema/' . $guid . '.php';
+            if (is_file(RUNTIME_PATH . 'schema/' . $schema . '.php')) {
+                $info = include RUNTIME_PATH . 'schema/' . $schema . '.php';
             } else {
                 $info = $this->connection->getFields($guid);
             }