Question

how to generate invoice number such as below :

Invoice Number = MC1200001 

MC : Company name
12 : current year (Flexibel)
00001 : auto increment (Flexibel - auto increment and will reset to 00001 again if year is 2013)

expected result :

current year 2012 :

MC1200001
MC1200002
MC1200003
.....

year 2013

MC1300001
MC1300002
MC1300003
.....

Need your idea or solution for this problem.

Thanks.

Answer 1

You could use three columns to express the different parts of the number and use a view or simple CONCAT expression to grab the entire number per invoice.

Then to get a new number, you’d insert a record using a function that would return the actual row id or concatenated number.

I’d do something like this: (leaving the leading zero’s out for brevity)

DROP TABLE IF EXISTS invoces;

CREATE TABLE invoices (
   id INT NOT NULL UNIQUE AUTO_INCREMENT
  ,company CHAR(2)
  ,number INT
  ,fiscal_year INT
 , PRIMARY KEY (company, number, fiscal_year)
);

DROP PROCEDURE IF EXISTS spCreateInvoice;
DELIMITER $$

CREATE PROCEDURE spCreateInvoice
(
   pCompany CHAR(2)
  ,pFiscalYear INT
)
BEGIN
  INSERT INTO invoices (
    company, fiscal_year, number
  ) SELECT
        pCompany
      , pFiscalYear
      , 1+MAX(number) 
    FROM invoices 
    WHERE 
        fiscal_year=pFiscalYear;

  SET @id = LAST_INSERT_ID();

  SELECT CONCAT(i.company, i.number, i.fiscal_year) invoice_number, i.* from invoices i WHERE id = @id;
END;
$$
DELIMITER ;

CALL spCreateInvoice('MC', 12);
CALL spCreateInvoice('MC', 12);
CALL spCreateInvoice('MC', 12);
CALL spCreateInvoice('MC', 12);

CALL spCreateInvoice('MC', 13);
CALL spCreateInvoice('MC', 13);
CALL spCreateInvoice('MC', 13);
CALL spCreateInvoice('MC', 13);

You can run this as a script against your mysql test database and see the following output:

invoice_number  id  company number  fiscal_year
MC012           1   MC      0       12

invoice_number  id  company number  fiscal_year
MC112           2   MC      1       12

invoice_number  id  company number  fiscal_year
MC212           3   MC      2       12

invoice_number  id  company number  fiscal_year
MC312           4   MC      3       12

invoice_number  id  company number  fiscal_year
MC013           5   MC      0       13

invoice_number  id  company number  fiscal_year
MC113           6   MC      1       13

invoice_number  id  company number  fiscal_year
MC213           7   MC      2       13

invoice_number  id  company number  fiscal_year
MC313           8   MC          3   13