How to Auto Increment ID Numbers with Letters and Numbers - mysql

Question

How to Auto Increment ID Numbers with Letters and Numbers, example "KP-0001" it will increment to "KP-0002"
Thank you!

Answer 1

here is a useful article
auto increment with a string of numbers and letters
But basically I encourage you to create your own algorithm on this. You can add that algorithm in BEFORE INSERT trigger. Or you can do that on the front-end.
Example of pseudocode for the algorthm
get the lastID [KP-0001]
remove some characters and put it in a variable [KP-]
convert the remaining into number since it's a string [0001]
increment by 1 [1 + 1 = 2]
convert it back to string and pad zero on the right [0002]
concatenate the variable and the newly incremented number [KP-0002]
save it.

Answer 2

I tried to do that in many ways but was unable to reach the solution... I also used triggers but that too didn't help me...
But I found a quick solution for that...
For example you want your employee to have employee codes 'emp101', 'emp102',...etc.
that too with an auto increment...
First of all create a table with three fields the first field containing the letters you want to have at the beginning i.e."emp", the second field containing the auto increasing numbers i.e 101,102,..etc., the third field containing both i.e 'emp101', 'emp102',...etc.
CREATE TABLE employee
(
empstr varchar( 5 ) default 'emp',
empno int( 5 ) AUTO_INCREMENT PRIMARY KEY ,
empcode varchar( 10 )
);
now providing an auto_increment value to empno.
ALTER TABLE employee AUTO_INCREMENT=101;
now coming to the topic... each time you insert values you have to concatenate the first two fields to get the values for the third field
INSERT INTO employee( empcode )
VALUES ('xyz');
UPDATE employee SET empcode = concat( empstr, empno ) ;

Answer 3

You can't auto increment varchar data type. Other way of doing this is to bifurcate varchar column into two different columns one will have integer part and other will have alphabet like in your case KP- once you auto increment all integer rows just concatenate these two columns

Answer 4

CREATE TABLE Customer (
CUSId INT NOT NULL IDENTITY(1, 1) PRIMARY KEY
,CUSKey AS 'Cus' + RIGHT('000' + CONVERT(VARCHAR(5), CUSId), 6) PERSISTED
,CusName VARCHAR(50)
,mobileno INT
,Gender VARCHAR(10)
)

Answer 5

Auto-increment is an integer, so adding text will not be possible.
Check out this question for other references.

Answer 6

Make a procedure, in my case MySQL.
CREATE PROCEDURE MOSTRAR_CODIGO_CLASE_PRODUCTO()
BEGIN
declare max varchar(10);
declare num int;
declare CCodigo varchar(10);
set max = (select MAX(Codigo_CP) from CLASE_PRODUCTO);
set num = (SELECT LTRIM(RIGHT(max,4)));
if num>=1 and num <=8 then
set num = num + 1;
set CCodigo = (select concat('CP000' , CAST(num as CHAR)));
elseif num>=9 and num <=98 then
set num = num + 1;
set CCodigo = (select concat('CP00' , CAST(num as CHAR)));
elseif num>=99 and num <=998 then
set num = num + 1;
set CCodigo = (select concat('CP0' , CAST(num as CHAR)));
elseif num>=999 and num <=9998 then
set num = num + 1;
set CCodigo = (select concat('CP' , CAST(num as CHAR)));
else
set CCodigo=(select 'CP0001');
end if;
SELECT MAX(CCodigo) AS Codigo_CP FROM CLASE_PRODUCTO;
END $
Java Class
public static boolean insertarClaseProducto(ClaseP cp){
boolean resp = false;
Connection cn;
Connection con = new Connection();
cn = con.connect();
try{
CallableStatement cs = cn.prepareCall("CALL REGISTRAR_CLASE_PRODUCTO (?)");
cs.setString(1, cp.getNombreCP());
int i = cs.executeUpdate();
if(i==1)
resp = true;
else
resp = false;
}catch(Exception e){System.out.println(e);}
return resp;
}
returns:
Codigo_MP Nombre_MP Estado_MP
MP0001 LG HAB
MP0002 GENIUS HAB
MP0003 MICRONICS HAB
MP0004 SONY HAB
MP0005 PANASONIC HAB