更新内核，API接口开发的一些尝试，后期会增加API接口开发这块

core/library/think/db/builder/Mysql.php

@@ -47,6 +47,9 @@ class Mysql extends Builder
             $key = '`' . $key . '`';
         }
         if (isset($table)) {
+            if (strpos($table, '.')) {
+                $table = str_replace('.', '`.`', $table);
+            }
             $key = '`' . $table . '`.' . $key;
         }
         return $key;

core/library/think/db/builder/Sqlsrv.php

@@ -21,7 +21,7 @@ class Sqlsrv extends Builder
     protected $selectSql       = 'SELECT T1.* FROM (SELECT thinkphp.*, ROW_NUMBER() OVER (%ORDER%) AS ROW_NUMBER FROM (SELECT %DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%) AS thinkphp) AS T1 %LIMIT%%COMMENT%';
     protected $selectInsertSql = 'SELECT %DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%';
     protected $updateSql       = 'UPDATE %TABLE% SET %SET% FROM %TABLE% %JOIN% %WHERE% %LIMIT% %LOCK%%COMMENT%';
-    protected $deleteSql       = 'DELETE FROM %TABLE% %USING% %JOIN% %WHERE% %LIMIT% %LOCK%%COMMENT%';
+    protected $deleteSql       = 'DELETE FROM %TABLE%  %USING% FROM %TABLE%  %JOIN% %WHERE% %LIMIT% %LOCK%%COMMENT%';
 
     /**
      * order分析