使用C＃在本地计算机上获取默认的SQL Server实例

Question

有一种方法可以检查哪个实例是Main / Default。

我用这个

 private void GetDataSources2()  
 {  
     string ServerName = Environment.MachineName;  

     RegistryView registryView = Environment.Is64BitOperatingSystem ? RegistryView.Registry64 : RegistryView.Registry32;  

     using (RegistryKey hklm = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, registryView))  
     {  
         RegistryKey instanceKey = hklm.OpenSubKey(@"SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL", false);  

         if (instanceKey != null)  
         {  
             foreach (var instanceName in instanceKey.GetValueNames())  
             {  
                 Console.WriteLine(ServerName + "\\" + instanceName);  
             }  
         }  
     }  
 } 

查找所有实例。之后，我检查数据库是否存在于任何实例上。如果不是，我想在主实例上创建它。

Answer 1

根据MSDN，默认实例名称为MSSQLSERVER：

默认实例名称为MSSQLSERVER；它不需要客户端指定实例名称即可建立连接。

因此，要定义实例是否为默认实例，必须检查实例的名称是否为MSSQLSERVER。

这里可以对您的代码进行更改，以定义实例是否默认：

private void GetDataSources2()
{
    string ServerName = Environment.MachineName;

    RegistryView registryView = Environment.Is64BitOperatingSystem ? RegistryView.Registry64 : RegistryView.Registry32;

    using (RegistryKey hklm = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, registryView))
    {
        RegistryKey instanceKey = hklm.OpenSubKey(@"SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL", false);

        if (instanceKey != null)
        {
            foreach (var instanceName in instanceKey.GetValueNames())
            {
                if (instanceName == "MSSQLSERVER")
                    // To reference default instance we should use name "ServerName".
                    Console.WriteLine(ServerName);
                else
                    // To reference non default instances we should use name "ServerName\InstanceName".
                    Console.WriteLine(ServerName + "\\" + instanceName);
            }
        }
    }
}