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问题 I am trying to add a column (MSSQL 2005) to a table (Employee) with a default constraint of a primary key of another table (Department). Then I am going to make this column a FK to that table. Essentially this will assign new employees to a base department based off the department name if no DepartmentID is provided. This does not work: DECLARE @ErrorVar INT DECLARE @DepartmentID INT SELECT @DepartmentID = DepartmentID FROM Department WHERE RealName = 'RocketScience' ALTER TABLE [Employee]

问题 What's the best way to set default properties for new entities in DDD? Also, what's the best way to set default states for complex properties (eg. collections)? My feeling is that default values should be in the models themselves as they are a form of business rule ("by default, we want X's to be Y & Z"), and the domain represents the business. With this approach, maybe a static "GetNew()" method on the model itself would work: public class Person { public string Name { get; set; } public

问题 Just wondering if anyone can help me with a problem I've come across in Java. Is there functionality within Java to produce a section of code that will open the default email application on a user's PC? (I guess almost like a fancy mailto link...) If there is - is it possible to populate fields such as the To and Subject fields? Thanks, Mike. 回答1: Desktop.mail(URI mailtoURI) is your friend! Javadoc: Launches the mail composing window of the user default mail client, filling the message fields

问题 Following the suggestions from How to add my browser in the default browser selection list in android?. I have specified my Intent in the manifest file: <intent-filter> <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <data android:scheme="http"/> <data android:scheme="https"/> </intent-filter> I have also added the permission: <uses-permission android:name="android.permission.INTERNET"></uses-permission> But still my browser is

问题 I have a DateTime property on one of my Model classes and want to set it's default vaule to Now. The below code is what I had hoped would work but won't compile. It doesn't like the System.DateTime.Now call: [DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)] [Display(Name = "To Date")] [Required(ErrorMessage = "To Date is required.")] [DefaultValue(System.DateTime.Now)] public DateTime DateTo { get; set; } Any ideas? 回答1: In the model class: private DateTime _date =

问题 I have a textarea that i would like to show some default text on page load. Once the textarea is clicked i would like to have the text disappear and possibly if user clicked in textarea and did not type anything in and then clicked out of textarea the default text will show again. I have searched Google and on here but i can only seem to find tutorials relating to text boxes and NOT textareas, plus i already am using a class on the textarea so cannot depend on class for it to work. Does

问题 I'm need of custom artifact installation and can't figure how to override the default one (from default maven lifecycle). So my question is: How to configure maven install plugin in my pom.xml so it doesn't do default install and executes just my custom install-file goals? I tried without id and with default-install id and it didn't help. Update: From the provided answer - this does not work for me (I see two install attempts in log). <pluginManagement> <plugins> <plugin> <groupId>org.apache

问题 Is there a way to make python3.5 as the default python in AWS. every time i try the next time i connect python2.7 is the default one and pip 6 is the last version, knowing that I did updated it some minutes before. here is the method i followed : amazon_link here is another link of amazon telling the versions, actually they are at 3.5 another_link Thank you in advance, :) best wishes 回答1: alternatives --set python /usr/bin/python3.5 and then back if you want to alternatives --set python /usr

问题 This question already has answers here : Why can I access an item in KeyCollection/ValueCollection by index even if it doesn't implement IList(Of Key)? (2 answers) Closed 3 years ago . I have a VB.NET project where I am able to iterate through the keys and values collections of a dictionary object using an index: MyDictionary.Keys(idx) MyDictionary.Values(idx) When this code is taken from the test project and placed into the real project I get the following error: 'System.Collections.Generic

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 years ago . How do I change default Directory and index File for Apache (installed via XAMPP) so instead of looking for htdocs and index , it looks for myPath and myFile , respectively? 回答1: The research link you pasted has the first part of the answer to your question, changing the path you want serve but the second part