diff --git a/OpenAuth.App/BuilderTable/BuilderTableApp.cs b/OpenAuth.App/BuilderTable/BuilderTableApp.cs
index 9fa4b98e..7012b959 100644
--- a/OpenAuth.App/BuilderTable/BuilderTableApp.cs
+++ b/OpenAuth.App/BuilderTable/BuilderTableApp.cs
@@ -137,7 +137,9 @@ namespace OpenAuth.App
             obj.CreateUserId = user.Id;
             obj.CreateUserName = user.Name;
             UnitWork.Add(obj);
+            UnitWork.Save();  //需要先保存表结构，后面才能正常判定
 
+            _dbExtension.ProcessExternalDb(obj.Id);  //先处理外部数据库连接
             var columns = _dbExtension.GetDbTableStructure(obj.TableName);
             if (!columns.Any())
             {
diff --git a/OpenAuth.App/BuilderTable/BuilderTableColumnApp.cs b/OpenAuth.App/BuilderTable/BuilderTableColumnApp.cs
index f5ba8695..d2e7de39 100644
--- a/OpenAuth.App/BuilderTable/BuilderTableColumnApp.cs
+++ b/OpenAuth.App/BuilderTable/BuilderTableColumnApp.cs
@@ -82,17 +82,7 @@ namespace OpenAuth.App
         /// </summary>
         public void Sync(SyncStructureReq req)
         {
-            var builderTable = SugarClient.Queryable<BuilderTable>().First(u => u.Id == req.BuilderTableId);
-            if (builderTable != null)
-            {
-                //如果代码生成器配置了外部数据库连接，则使用外部数据库连接
-                var connection = SugarClient.Queryable<ExternalDataSource>().First(u => u.Id == builderTable.ExternalDataSourceId);
-                if (connection != null)
-                {
-                    var dbType = connection.Dbtype;
-                    _dbExtension.SetConnection(connection.Connectionstring, dbType);
-                }
-            }
+            _dbExtension.ProcessExternalDb(req.Id);  //先处理外部数据库连接
             var columns = _dbExtension.GetDbTableStructure(req.TableName);
             if (!columns.Any())
             {
diff --git a/OpenAuth.App/BuilderTable/Request/SyncStructureReq.cs b/OpenAuth.App/BuilderTable/Request/SyncStructureReq.cs
index 6d506edd..a05d5393 100644
--- a/OpenAuth.App/BuilderTable/Request/SyncStructureReq.cs
+++ b/OpenAuth.App/BuilderTable/Request/SyncStructureReq.cs
@@ -15,17 +15,10 @@ namespace OpenAuth.App.Request
 	/// </summary>
     public class SyncStructureReq 
     {
-        /// <summary>
-        /// 列ID
-        /// <para>Id为空则为添加</para>
-        /// </summary>
-        public string Id { get; set; }
-
-
         /// <summary>
         /// 代码生成器主表ID
         /// </summary>
-        public string BuilderTableId { get; set; }
+        public string Id { get; set; }
         
         /// <summary>
         /// 表英文全称
diff --git a/OpenAuth.App/DbExtension.cs b/OpenAuth.App/DbExtension.cs
index af8c4ecc..b09212bc 100644
--- a/OpenAuth.App/DbExtension.cs
+++ b/OpenAuth.App/DbExtension.cs
@@ -19,6 +19,7 @@ namespace OpenAuth.App
     public class DbExtension
     {
         protected ISqlSugarClient SugarClient;
+        private string _dbTypeStr;
 
         private IOptions<AppSetting> _appConfiguration;
         private IHttpContextAccessor _httpContextAccessor;
@@ -84,16 +85,20 @@ namespace OpenAuth.App
         /// <returns></returns>
         public IList<SysTableColumn> GetDbTableStructure(string tableName)
         {
-            var dbtype = _appConfiguration.Value.DbTypes[_httpContextAccessor.GetTenantId()];
-            if (dbtype == Define.DBTYPE_MYSQL)
+            //如果是空,说明没有通过ProcessExternalDb设置过，直接从本地读取
+            if(string.IsNullOrEmpty(_dbTypeStr)){
+                _dbTypeStr = _appConfiguration.Value.DbTypes[_httpContextAccessor.GetTenantId()];
+            }
+
+            if (_dbTypeStr == Define.DBTYPE_MYSQL)
             {
                 return GetMySqlStructure(tableName);
             }
-            else if (dbtype == Define.DBTYPE_SQLSERVER)
+            else if (_dbTypeStr == Define.DBTYPE_SQLSERVER)
             {
                 return GetSqlServerStructure(tableName);
             }
-            else if (dbtype == Define.DBTYPE_PostgreSQL)
+            else if (_dbTypeStr == Define.DBTYPE_PostgreSQL)
             {
                 return GetPostgreStructure(tableName);
             }
@@ -409,13 +414,49 @@ namespace OpenAuth.App
             return new List<SysTableColumn>();
         }
 
+        /// <summary>
+        /// 处理外部数据库
+        /// </summary>
+        /// <param name="buildertableId">代码生成器表ID</param>
+        public void ProcessExternalDb(string buildertableId){
+            var builderTable = SugarClient.Queryable<BuilderTable>().First(u => u.Id == buildertableId);
+            if (builderTable != null)
+            {
+                //如果代码生成器配置了外部数据库连接，则使用外部数据库连接
+                var connection = SugarClient.Queryable<ExternalDataSource>().First(u => u.Id == builderTable.ExternalDataSourceId);
+                if (connection != null)
+                {
+                    var dbType = connection.Dbtype;
+                    SetConnection(connection.Connectionstring, dbType);
+                }
+            }
+        }
+
         /// <summary>
         /// 设置数据库连接
         /// </summary>
         /// <param name="connectionString">数据库连接字符串</param>
         /// <param name="dbType">数据库类型</param>
-        public void SetConnection(string connectionString, int? dbType)
+        private void SetConnection(string connectionString, int? dbType)
         {
+            switch ((SqlSugar.DbType)dbType)
+            {
+                case SqlSugar.DbType.MySql:
+                    _dbTypeStr = Define.DBTYPE_MYSQL;
+                    break;
+                case SqlSugar.DbType.SqlServer:
+                    _dbTypeStr = Define.DBTYPE_SQLSERVER;
+                    break;
+                case SqlSugar.DbType.Oracle:
+                    _dbTypeStr = Define.DBTYPE_ORACLE;
+                    break;
+                case SqlSugar.DbType.PostgreSQL:
+                    _dbTypeStr = Define.DBTYPE_PostgreSQL;
+                    break;
+                default:
+                    _dbTypeStr = Define.DBTYPE_MYSQL;
+                    break;
+            }
             var config = new ConnectionConfig
             {
                 ConnectionString = connectionString,