auto-increment

问题 I am building a Queue Management System in C# using Sql Server 2008 R2. Providing Services in many departments at a time Like Customer Care, Ladies Section, Registration Section. For Example. For Ladies Section : Token {1-50} Customer Care : Token {51-350} Registration Section : Token {351-550} Normal Customers: Token {551-999} I am using this Approach, First of all i am looking from which department I am getting request. Check Token Range of this department in Table, then getting existing

问题 It looks like NH gets MAX(ID) only once, at first insert and then stores this value internally, this causes me some problems when other processes inserts data. Then I have not actual ID and duplicate key exception is thrown. Lets imagine we have table Cats CREATE TABLE Cats(ID int, Name varchar(25)) Then we have corresponding mapping done with FluentNhibernate public class CatMap : ClassMap<Cat> { public CatMap() { Id(m=>m.ID).GeneratedBy.Increment(); Map(m=>.Name); } } All I want to achieve

问题 My database has a parent table with an auto-incrementing primary key identity 'ID', and a normal 'TIMESTAMP column'. I have child tables with a foreign key that refer to the parent 'ID' column. I want to write a stored procedure that inserts a new column into both the parent and child databases. How would I set the child 'ID' column to equal the new auto-incremented parent 'ID' column? Does this require a separate: SELECT TOP 1 * FROM PARENT_TABLE Or is there another way? 回答1: You can

问题 I have a field in my SQL Server 2008 table that is auto number incremental of 1 and has over 100,000 records in it. We are migrating servers at the moment so I'm looking at doing a little spring cleaning and will be deleting all the records from this table. I still want the auto number incremental of 1 facility but I would like the first record to start at 102001, is this possible. Thanks. 回答1: Yes, simply set the start value of IDENTITY to be your chosen number. Syntax: IDENTITY (seed

问题 I have an mysql table with an column called "id" - this column has auto increment set. I only want to know how i can get, with PHP and PDO, the next auto increment value, without doing a INSERT INTO query. (i found some questions about this - but none without INSERT INTO and only based on mysqli). Thanks! 回答1: Why do you need this ? If you need, you can get the current auto increment value like this, but I don't see a situation where this would be needed. SELECT `AUTO_INCREMENT` FROM

问题 Hey Everybody, I'm trying to make a table that will have a bunch of ids referring to a user, and for each user there will be multiple posts that should also have their own ids. My question is how do I make the table so that when a record is inserted for a certain user, their post id should be incremented by 1. Meaning user 1 will have posts 1,2,3, and 4, user 2 will have posts 1,2,3,4,5,6, and 7, etc... event_id is the primary key for the table, FK_user_ID is the foreign key that maps back to

问题 I'm working on a project in which we may be using an Oracle 11g or an Oracle 12c database depending on what's available in various environments -- not ideal I know :( My project is a Spring Boot application and I'm using Liquibase to manage the database objects. My problem is that if I'm running on an Oracle 12c database, I'd like to take advantage of auto incrementing IDs while on Oracle 11g, I'll have to rely on a trigger and a sequence. Is there a way to detect if the current version of

问题 I have realised that mnesia doesnot support auto-increment feature as does MySQL or other RDBMS do.The counters talked about in mnesia documentation are not really well explained. forexample i have found sofar one function in the entire documentation which manipulates counters mnesia:dirty_update_counter({Tab::atom(),Key::any()}, Val::positive_integer()) So, this has disturbed me for a time coz it works with records of type {TabName, Key, Integer} This is also unclear and possibly because no

问题 I have a table of emails. The last record in there for an auto increment id is 3780, which is a legit record. Any new record I now insert is being inserted right there. However, in my logs I have the occasional: Query FAIL: INSERT INTO mail.messages (timestamp_queue) VALUES (:time); Array ( [0] => 23000 [1] => 1062 [2] => Duplicate entry '4294967295' for key 1 ) Somehow, the autoincrement jumped up to the INT max of 4294967295 Why on god's green earth would this get jumped up so high? I have

问题 I have MySQL Table with an Order table in a DB this table has an auto-incremental id. Up-till now we have general numeric Order-ID likewise 1,2,3,4,5... From now onwards I have to append the series A20 to my id like A20103, A20104, A20105 and so on and when the last three digits reaches 999 the series appended should get changed to A21001, A21002, A21003 and so on, the same series has to be added in the previously added orders.. How can i achieve this task? please guide 回答1: something along