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目前使用直连模型时有一定的限制，请您在使用时注意规避。
使用 SQL Server 数据库时，字段类型如ntext、text、varchar(max)，nvarchar(max)无法识别出来， 需要手动添加实体列转换后使用。 （比如将 ntext 转换成 nvarchar(2000)）
SQL Server数据库的 money 类型的字段值位数取最大值(922,337,203,685,477.5807)时，前端对应的数据类型最大值范围无法覆盖到，只能展现922,337,203,685,477.6。
当创建 自定义实体（使用SQL 查询方式）时， 在 SQL Server中， 当有 Date或者 Time类型的， 都会识别成 DateTime。 这种情况下，在仪表板中如果在 date 类型中拖出来时分秒，就会报错。
decimal 类型的字段的值位数小于30。
目标数据库需要支持窗口函数。比如 My sql 5.X系列不支持。