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问题 Consider you have table USER which has primary key on field USER_ID . And every table in your db should contain MODIFIED_BY field with id of actual user. My aim is to specify default value on that field which equals id of user with appropriate name. F.E. you have user with name system and you want every record of every table to have id of this user in MODIFIED_BY field. As well you want all the new records to satisfy this. 回答1: Assuming that you are referring to other sorts of users than

问题 I want to give a model field default value from the a model method. How can i do that ? when i try this code Class Person(models.Model): def create_id(self): return os.urandom(12).encode('hex') name = models.CharField(max_length = 255) id = models.CharField(max_length = 255,default = self.create_id) I get NameError: name 'self' is not defined. If i remove the 'self' i get that 'create_id' needs 1 parameter. 回答1: You can define global method like this: def create_id(): return os.urandom(12)

问题 I am reading data from a source in the Data Flow tab. The data is put through a Conditional Split Order 1 -> ColA = "Y" Order 2 -> ColB = "Y" If the Default output condition gets hit, being neither ColA or ColB = "Y"... then I want to throw an exception / error so that it hits the "Fail Component" block. 回答1: Pick your poison and connect it to the Default output. The quick and dirty is to attach a Derived Column Transformation and force a division by zero error. My preference is to route to a

问题 class class1(): def setdata(self,value1, value2): self.data = value1+value2 def display(self): print(self.data) For the above code, when I use it. It will require exactly two arguments. >>>a = class1() >>>a.setdata('123','456') But what if I want to set a default value for value2 , for exmaple, its( value2 ) default value is '000' . Next time when I use the class, I can either type >>>a = class1() >>>a.setdata('123') a.data will be '123000' Or I can type >>>a = class1() >>>a.setdata('123',

问题 I have a website which has been running on IIS7 for about 2 months. We have the default documents set up to load a default.asp page when users go to the domain with no page. Suddenly this morning, I am getting errors and the default document will not load. If I type the default.asp, the file loads just fine. Error Info: Module: DefaultDocumentModule Notification: ExecuteRequestHandler Handler: StaticFile Error Code: 0x80070002 here is a section from my applicationhost.config: <system

问题 Can anybody tell me what is the default value of a variable at the time of declaration in C# and vb?? 回答1: In c# you can use the default keyword to determine default values. For example: default(bool) default(int) default(int?) 回答2: Do you mean a (method) variable? or a field (on an instance or type)? For a method-level variable (in C# at least) it is irrelevant, since "definite assignment" means that you must give it a value before you can read it. Fields default to the bitwise zero state:

问题 I have two dropdowns, one is dependent on the other. I originally had my code using ng-repeat but read that it is more efficient to use ng-options. However, in switching over, I can't use ng-selected for the default any longer. I've looked at different methods of setting the default option in ng-options but they use either <option value="">Select Something Here</option> for a customized option or selecting straight from the dataset. However my value will be changing. Here is a plunker missing

问题 In Swing, the JFileChooser pointed to the user's default directory which is typically the "My Documents" folder in Windows. The JavaFX FileChooser does not have the same behavior by default. There is a setInitialDirectory method which should be fine, however there are a number of places in the application that we open FileChoosers. Unfortunately the FileChooser class is final, so I cannot simply extend the class and just call the setInitialDirectory once. Is there anything else I could do

问题 When installed more than one Browser and the default is not set, I will get the chooser dialog with the possibility to set the default. How does an application (or Activity) made itself recognizable by the system as a web browser. If I do something like this: Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_BROWSABLE); startActivity(Intent.createChooser(intent, "TEST")); I'll get a list of the apps: Browser (google), Contacts, Gmail, Phone, but not the Opera

问题 I have the following insert stored procedure: CREATE Procedure dbo.APPL_ServerEnvironmentInsert ( @ServerEnvironmentName varchar(50), @ServerEnvironmentDescription varchar(1000), @UserCreatedId uniqueidentifier, @ServerEnvironmentId uniqueidentifier OUTPUT ) WITH RECOMPILE AS -- Stores the ServerEnvironmentId. DECLARE @APPL_ServerEnvironment TABLE (ServerEnvironmentId uniqueidentifier) -- If @ServerEnvironmentId was not supplied. IF (@ServerEnvironmentId IS NULL) BEGIN -- Insert the data into