判断是否安装了SqlLocalDB

Question

我正在寻找一种在 WiX 中确定是否安装了 SQLLocalDB 的方法。我怎样才能做到这一点？ - 我可以检查注册表项吗？ - 如果是，哪个键？

Answer 1

RegistrySearch 应该这样做：

<Property Id="LOCALDB">
   <RegistrySearch Id="SearchForLocalDB" Root="HKLM" 
                   Key="SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL11E.LOCALDB\MSSQLServer\CurrentVersion"
                   Name="CurrentVersion"
                   Type="raw" />
</Property>

这会给你版本。

Answer 2

从注册表检查可能不会一直有效，因为如果用户卸载 localDb，那么注册表项可能仍然存在。

这是我用来从命令行识别 localDB 安装的函数 -

    internal static bool IsLocalDBInstalled()
    {
        // Start the child process.
        Process p = new Process();
        // Redirect the output stream of the child process.
        p.StartInfo.UseShellExecute = false;
        p.StartInfo.RedirectStandardOutput = true;
        p.StartInfo.FileName = "cmd.exe";
        p.StartInfo.Arguments = "/C sqllocaldb info";
        p.StartInfo.CreateNoWindow = true;
        p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
        p.Start();
        // Do not wait for the child process to exit before
        // reading to the end of its redirected stream.
        // p.WaitForExit();
        // Read the output stream first and then wait.
        string sOutput = p.StandardOutput.ReadToEnd();
        p.WaitForExit();

        //If LocalDb is not installed then it will return that 'sqllocaldb' is not recognized as an internal or external command operable program or batch file.
        if (sOutput == null || sOutput.Trim().Length == 0 || sOutput.Contains("not recognized"))
            return false;
        if (sOutput.ToLower().Contains("mssqllocaldb")) //This is a defualt instance in local DB
            return true;
        return false;
    }