readonly

问题 What configuration options should be used to construct a session that will not accumulate updates, and will always remain read only? It would seem that replacing the first or second level cache for a read only version might be the answer, how is that achieved using fluent configuration? 回答1: See how to create a readonly session in nHiberate? Alternatively you can replace the default Save/Update/Delete event listeners with your own implementations that do nothing To do so, in your NHibernate

问题 I have some intialized Property/Fields that are "constant" and I want to know which one of the following line is the best to use : public static Color MyColor { get { return Color.Red; } } public static readonly Color MyOtherColor = Color.Red; Is there some runtime differences after (lazy)initialization ? Are the performance usages differents ? 回答1: The Field usage guidelines recommend using public static read-only fields for predefined object instances. For example: public struct Color { //

问题 I used static scaffolding to create CRUD-methods for my Test domain class. When using the created TestController only I had no problems whatsoever saving new Test objects. However, I wanted to extend the functionality and implemented a corresponding TestService class. Doing so I now always get an error on saving a Test object: Connection is read-only. Queries leading to data modification are not allowed And here it started to malfunction. Following the code of TestService . If I understood it

问题 What is a robust way of making certain lines readonly in an AvalonEdit control? Users are allowed to change certain method bodies in a C# or VB template file but nothing else. The readonly state per line needs to be kept intact when users add or remove lines, i.e. the readonly blocks below the edited content need to shift up and down accordingly. I'm using AvalonEdit in a WPFHost on winforms. 回答1: You can set textEditor.TextArea.ReadOnlySectionProvider to an implementation of

问题 Looking into the Const::Fast source I noticed that it used the built-in function Internals::SvREADONLY internally. Is it safe to use that function directly in my Perl script? It seems to be present in core from Perl 5.8. my $PI = 4 * atan2 1, 1; Internals::SvREADONLY($PI => 1); $PI = 2.718; # Modification of a read-only value attempted at .. 回答1: C:\>perldoc Internals No documentation found for "Internals". No. More specifically, the package is named "Internals" for a reason. It is not

问题 I'm seeing an issue in IE7 and IE8 (but not other browsers) with a textarea when I dynamically change its "readonly" attribute. The textarea is initially defined as being read-only, and when the user clicks inside the textbox I set readOnly to false. At this point, if I type any normal characters, they don't get displayed - in fact, the text box acts like it is still read-only (i.e., arrow keys move around, hitting Delete goes to the previous page, etc.) If I click inside the textarea again,

问题 After reading the faq's and everything else I can find, I'm still confused. If I have a char pointer that is initialised in this fashion: char *s = "Hello world!" The string is in read-only memory and I cannot change it like this: *s = 'W'; to make "Wello world!". This I understand, but I can't, for the life of me, understand how to make it NOT read-only. Do I have to use an array instead of a pointer? Like here? This is my code: char *s = str; char *e = s; while (*e != '\0') e++; e--; char

问题 I was a bit puzzled by my <input ng-bind="x.a * x.b" tabindex="-1" readonly/> expression not working. I can't use ng-model there (as the product is no L-value), so I blindly switched to ng-bind . I guess, it doesn't work because of the funny HTML inconsistency (using value=xxx instead of placing the value in the element text). So I switched to <input value="{{x.a * x.b}}" tabindex="-1" readonly/> which solved the problem, but shouldn't input ng-bind work anyway? AFAIK jQuery val() does. Am I

问题 In reading up on backing up GAE's Datastore, where: We strongly recommend that you set your application to read-only mode during a backup or restore... After a cursory inspection, it appears that the only way to do this is via the GAE web admin UI, where you either Disable or Re-Enable Writes inside a page somewhere. I would like to write some Ant buildfiles and/or shell and/or Python scripts that would allow me to backup/restore my GAE app's Datastore automatically. This would mean I would

问题 I want to have a read-only functionality in one of my entities. I know that in JPA 2.0 we don't have such functionality per se. I thought we can achieve it using updateable=false, insertable=false but I don't think I get how it works. Assume that I have two entities: OrderedItem and Customer : @Entity public class OrderedItem { @Id @GeneratedValue private int id; private String name; @ManyToOne @JoinColumn(updatable = false) private Customer owner; // bunch of simple getters and setters }