auto-increment

问题 can somebody please help me? How to add auto increment number in div ID using javascript? I have four divs and I'd like to have them automatically numbered (box1, box2, box3, box4) in the ID by javascript. Here's my code <div id="box" class="something"> </div> <div id="box" class="something"> </div> <div id="box" class="something"> </div> <div id="box" class="something"> </div> <script> var list = document.getElementsByClassName("something"); for (var i = 0; i <= list.length; i++) { list[i]

问题 Code is simple. Tag.cs entity: public partial class Tag { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } public string Name { get; set; } public string Description { get; set; } } HomeController.cs class: public async Task<IActionResult> Index() { tagRepository.Insert(new Tag { Name = "name", Description = "description" }); await UnitOfWork.SaveChangesAsync(); // calls dbContext.SaveChangesAsync() return View(); } TagRepository.cs class: // Context it

问题 I am developing an app in Django. I want to insert in my model an auto-incrementing alphanumerical ID field, having, by default, a fixed alphabetical part and an auto-incrementing numerical part. But I also want the availability to change, from admin section, this id to another alphanumerical one, with a different alphanumerical and numerical part. Please note: I don't want to overwrite the django default id field, I just want to include in my model a field that gets as default value an auto

问题 Is there a way to put an attribute on a property to tell RavenDB to use this property just like the ID-property and put an auto increment on it? Pseudo-code: public class MyObj { public string Id { get; set; } [Increment] public int OtherProp { get; set; } } 回答1: Dynamicus points to the correct solution, but I'd like to give the exact sample-code for helping other Stackoverflow-users and maybe also making the solution more searchable. In relation to the question's example-code, here is the

问题 Is there a way to put an attribute on a property to tell RavenDB to use this property just like the ID-property and put an auto increment on it? Pseudo-code: public class MyObj { public string Id { get; set; } [Increment] public int OtherProp { get; set; } } 回答1: Dynamicus points to the correct solution, but I'd like to give the exact sample-code for helping other Stackoverflow-users and maybe also making the solution more searchable. In relation to the question's example-code, here is the

问题 Is there a way to put an attribute on a property to tell RavenDB to use this property just like the ID-property and put an auto increment on it? Pseudo-code: public class MyObj { public string Id { get; set; } [Increment] public int OtherProp { get; set; } } 回答1: Dynamicus points to the correct solution, but I'd like to give the exact sample-code for helping other Stackoverflow-users and maybe also making the solution more searchable. In relation to the question's example-code, here is the

问题 //Well i have gone through so many tutorial but coudlnt find my thing so i am here to put up my query i have two DatePicker FromDate and ToDate What i want is when User selext the date it should come in a String Array of Dates suppose my date is Start_Date="1/09/2012" i want to fill Array like String[] Date Arrau= {"1/09/2012","2/09/2012","3/09/2012","4/09/2012"} What i have done is DateDifference=Integer.parseInt(EndDate)-Integer.parseInt(StartDate); SimpleDateFormat sdf= new

问题 I have a table to store contacts. I want to grab the max value of a column where adding user_id is {some number} and set that as the same column value for the current inserting record. I'm using prepared statements: pg_prepare($db, "add", 'INSERT INTO '.CONTACTS.' (c_user_serial,c_name,c_company,c_email) VALUES ($1, $2, $3, $4)'); $insert_co = pg_execute($db, "add", array({(MAX OF c_user_serial where c_user_id = 1234) + 1 increment },$name,$company,$email)); c_user_id is the ID of the user

问题 As I receive data from the user, I validate the format of the input every time (PHP). The only thing I can't validate (or I wouldn't want to) is the constraint (for example foreign key) violation. I let the DML to raise and error and the database driver to throw an exception. After catching it I just print out some error message by MySQL's error code. The problem is, even when insertion fails, I see that the autoincrement sequence still grows, increases. How can I prevent that? 回答1: That is

问题 As I receive data from the user, I validate the format of the input every time (PHP). The only thing I can't validate (or I wouldn't want to) is the constraint (for example foreign key) violation. I let the DML to raise and error and the database driver to throw an exception. After catching it I just print out some error message by MySQL's error code. The problem is, even when insertion fails, I see that the autoincrement sequence still grows, increases. How can I prevent that? 回答1: That is