employee id automatic generate with prefix

问题

i am so confuse i want employee id is automatic generate with prefix format i know that is possible from before trigger in sql server i am follow the post http://www.aspdotnet-suresh.com/2012/04/set-custom-auto-generatedincrement.html

USE [test1]
GO

/****** Object:  Table [dbo].[Users]    Script Date: 03/08/2013 12:28:08 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[Users](
    [UserId] [varchar](50) NOT NULL,
    [UserName] [varchar](50) NULL,
    [LastName] [varchar](50) NULL,
    [Location] [varchar](50) NULL,
 CONSTRAINT [PK_Users] PRIMARY KEY CLUSTERED 
(
    [UserId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

And the display is

    UserId  UserName    LastName    Location
08U13000    SureshDasari    Dasari  Chennai
08U13001    SureshDasari    Dasari  Chennai
08U13002    SureshDasari    Dasari  Chennai
08U13003    SureshDasari    Dasari  Chennai
08U13004    SureshDasari    Dasari  Chennai
08U13005    SureshDasari    Dasari  Chennai
08U13006    SureshDasari    Dasari  Chennai
08U13007    SureshDasari    Dasari  Chennai
08U13008    SureshDasari    Dasari  Chennai
08U13009    SureshDasari    Dasari  Chennai
08U13010    SureshDasari    Dasari  Chennai
08U13011    SureshDasari    Dasari  Chennai
08U13012    SureshDasari    Dasari  Chennai
08U13013    SureshDasari    Dasari  Chennai
08U13014    SureshDasari    Dasari  Chennai
08U13015    SureshDasari    Dasari  Chennai

How to automatically create the primary key that has the following series A001000001 ... A001xxxxxx in SQL?

but i want to do it from insert before trigger and this trigger work in same table and same row ex -

INSERT INTO Users (UserName,LastName,Location) VALUES('SureshDasari','Dasari','Chennai')

and userid automatic created ? like --08U13015,08U13014

i was doing it from insert into inserted table but error can not insert in inserted or deleted table
or any other method please help me thanks in advance

回答1:

The answer provided by @marc_s in the question is the way to do it.

In your case it would look like this:

create table Users
(
  Id int identity (3000, 1),
  UserId as '08U1'+right('0000'+cast(Id as varchar(5)), 5) persisted,
  UserName varchar(50),
  LastName varchar(50),
  Location varchar(50),
  constraint PK_Users primary key (UserId)
)

I would not do it like suggested here. You will have duplicates if you ever delete a row or in case of concurrency.

SQL Fiddle

来源：https://stackoverflow.com/questions/15288625/employee-id-automatic-generate-with-prefix

标签

sql

visual-studio-2010

sql-server-2008

triggers