连接到SQL Server Express数据库时遇到问题

Question

In my web application installed on IIS 7, I need to connect to a SQL Server Express database file (used for testing purposes only.) I use the following connection string in a web.config file:

<configuration>
  <connectionStrings>
    <add name="MyDbConnection" connectionString="data source=.\SQLEXPRESS;Integrated Security=true;AttachDBFilename='C:\Users\UserName\CSharp\WebApp004_TestDB\App_Data\Database1.mdf';User Instance=true;Connection Timeout=15" providerName="System.Data.SqlClient" />
  </connectionStrings>
</configuration>

I also set up NTFS permissions for the C:\\Users\\UserName\\CSharp\\WebApp004_TestDB\\App_Data folder as such:

• IIS_IUSRS = FullControl
• IUSR = FullControl
• NT SERVICE\\MSSQL$SQLEXPRESS = FullControl
• IIS AppPool\\[MyAppPoolName] = FullControl

That still didn't help. When I try to connect to that database via my C# code I get an exception:

An attempt to attach an auto-named database for file C:\\Users\\UserName\\CSharp\\WebApp004_TestDB\\App_Data\\Database1.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

Note that the same code works on another machine with the actual SQL Server installed (with a different connection string where I used DB user name and password.)

Any idea what am I missing here?

Answer 1

看看这个连接字符串