1、把mdf文件和ldf文件拷贝到数据库的默认路径C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA里；
2、在sqlserver里新建个查询，执行下面代码；
USE master; GO CREATE DATABASE NewFile ON (FILENAME = ‘C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA\File.mdf‘), (FILENAME = ‘C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA\File_log.ldf‘) FOR ATTACH; GO
原文：https://www.cnblogs.com/gzyx1988/p/14754679.html