readonly

问题 I'm creating a bash script which, among other things, gathers some data from a MySQL database. My MySQL user has write privileges, but for safety reasons I would like to temporarily set it to a read only state. Is it possible to do this from a command line? 回答1: To answer your original question, you can put your whole database to read only mode by this commands: FLUSH TABLES WITH READ LOCK; SET GLOBAL read_only = 1; and back to normal mode with: SET GLOBAL read_only = 0; UNLOCK TABLES; Beware

问题 How can I make a model completely read-only in the admin interface? It's for a kind of log table, where I'm using the admin features to search, sort, filter etc, but there is no need to modify the log. In case this looks like a duplicate, here's not what I'm trying to do: I'm not looking for readonly fields (even making every field readonly would still let you create new records) I'm not looking to create a readonly user : every user should be readonly. 回答1: See https://djangosnippets.org

问题 I have some .csv files which I'm using as part of a test bench. I can open them and read them without any problems unless I've already got the file open in Excel in which case I get an IOException : System.IO.IOException : The process cannot access the file 'TestData.csv' because it is being used by another process. This is a snippet from the test bench: using (CsvReader csv = new CsvReader(new StreamReader(new FileStream(fullFilePath, FileMode.Open, FileAccess.Read)), false)) { // Process

问题 I have some .csv files which I'm using as part of a test bench. I can open them and read them without any problems unless I've already got the file open in Excel in which case I get an IOException : System.IO.IOException : The process cannot access the file 'TestData.csv' because it is being used by another process. This is a snippet from the test bench: using (CsvReader csv = new CsvReader(new StreamReader(new FileStream(fullFilePath, FileMode.Open, FileAccess.Read)), false)) { // Process

问题 I'm returning a reference to a dictionary in my read only property. How do I prevent consumers from changing my data? If this were an IList I could simply return it AsReadOnly . Is there something similar I can do with a dictionary? Private _mydictionary As Dictionary(Of String, String) Public ReadOnly Property MyDictionary() As Dictionary(Of String, String) Get Return _mydictionary End Get End Property 回答1: Here's a simple implementation that wraps a dictionary: public class

问题 I'm returning a reference to a dictionary in my read only property. How do I prevent consumers from changing my data? If this were an IList I could simply return it AsReadOnly . Is there something similar I can do with a dictionary? Private _mydictionary As Dictionary(Of String, String) Public ReadOnly Property MyDictionary() As Dictionary(Of String, String) Get Return _mydictionary End Get End Property 回答1: Here's a simple implementation that wraps a dictionary: public class

问题 What is the difference between const and readonly in C#? When would you use one over the other? 回答1: Apart from the apparent difference of having to declare the value at the time of a definition for a const VS readonly values can be computed dynamically but need to be assigned before the constructor exits.. after that it is frozen. 'const's are implicitly static . You use a ClassName.ConstantName notation to access them. There is a subtle difference. Consider a class defined in AssemblyA .

问题 UPDATED As the title says, is there a way to toggle the "Hidden" or "Read-Only" switch on Windows using PHP? I'd like to do this without opening a shell exec() if possible. 回答1: A file can't be hidden , it's always in the file system. There's the *NIX convention that files starting with a . are not shown by default for certain operations (like the ls command), but only if you don't look hard enough. The same goes for Windows, but Windows handles it with file meta attributes. What you can

问题 I was not able to find on Apple iOS SDK information regarding which directories are writable and which are not for your application. I only assume that NSCachesDirectory and NSDocumentDirectory are writable but how about others, like NSApplicationSupportDirectory or NSTemporaryDirectory . Where can I find a complete list of common directories with their purpose and if they are writable or not by my application? I was able to locate possible values for NSSearchPathDirectory enum but they do

问题 I have a form with a textbox that has an attribute of read-only. This isn't a big deal but I thought I would ask, so is there a way to make that textbox so that the user cannot select it and put their cursor in it? The disabled attribute does that, but then that textbox doesn't get submitted with the form. Is there a js/jquery solution for this? SNIPPET <form> <div class="col-md-9"> @Html.EditorFor(model => model.Time, new { htmlAttributes = new { @class = "form-control clear-textbox create