CODEWITHSUNDEEP
mysqlsqldatabaseauto-increment
Albert Tobing
Albert Tobing

Reputation: 169

MySQL AUTO INCREMENT with Prefix (YYMM) that reset every month

I saw another post explaining the use of sequence table to create prefixed AUTO INCREMENT ID.

Link to referenced post

SQL Fiddle
http://sqlfiddle.com/#!2/0ed88/1

I need the generated auto increment format to be: YYMM + AUTO INCREMENT VALUE that reset every month. For example now is January, 2015. The generated id should be: 15011, 15012, 15013, etc. Next month February 2015, the generated id should be: 15021, 15022, 15023, etc. I can use the above method to generate the prefix, however how do I reset the AUTO INCREMENT value each month? Database is InnoDB. Any help will be greatly appreciated :)

MODIFIED CODE

CREATE TABLE table1_seq
(
  id INT NOT NULL AUTO_INCREMENT PRIMARY KEY
)|

CREATE TABLE Table1
(
  id VARCHAR(7) NOT NULL PRIMARY KEY DEFAULT '0', name VARCHAR(30)
)|


CREATE TRIGGER tg_table1_insert
BEFORE INSERT ON table1
FOR EACH ROW
BEGIN
  INSERT INTO table1_seq VALUES (NULL);
  SET NEW.id = CONCAT(DATE_FORMAT(NOW(),'%y%m'), LAST_INSERT_ID());
END |


INSERT INTO Table1 (name) VALUES ('Jhon'), ('Mark')|

Upvotes: 1

Views: 5536

Answers (3)

طه زيادة - Taha ZIADEH
طه زيادة - Taha ZIADEH

Reputation: 46

i've relied on the last answer above, i've used the orderDate field from my table and compared it with the current date during insertion , to decide finally if i want to reset or increment the purchaseOrderRef field: The aim is to insert custom auto increment order id (field name: "purchaseOrderRef" ) with the format DD-MM-XXX in table [Products_SumOrders]. such that it resets the XXX to 0 automatically every month:

    USE [Mydatabase] -- here you need to use your own database
    GO

    /****** Object:  Trigger [dbo].[customAutoIncrement]    Script Date: 10/1/2016 10:07:41 PM ******/

        SET ANSI_NULLS ON
        GO

        SET QUOTED_IDENTIFIER ON
        GO

         CREATE TRIGGER [dbo].[customAutoIncrement]
         ON [dbo].[Products_SumOrders]
        AFTER INSERT
        AS 
        BEGIN
            SET NOCOUNT ON;
            declare @maxOrderID int;
            declare @maxOrderRef nvarchar(max);
            declare @relativeID varchar(max);
            declare @orderId int;
            select @orderId =orderid from inserted;
            print(@orderId);--allow me to display the inserted order id
            SET @maxOrderID = (SELECT Max(orderid) FROM [Products_SumOrders] WHERE MONTH([OrderDate]) = (MONTH(GETDATE())) AND YEAR([OrderDate]) = YEAR(GETDATE()) and orderid < @orderId );
                print(@maxOrderID);--last added order
    --custom month format (always MM):
                declare @mon int;
                declare @stringMon nvarchar(10);
                set @mon= MONTH(GETDATE());
                IF @mon <10
                set @stringMon ='0' +  CONVERT(VARCHAR(1),@mon) ;
                ELSE
                set @stringMon = CONVERT(VARCHAR(2),@mon) ;
            IF @maxOrderID is null --no orders has been added in this month:
            begin
                set @maxOrderRef =  Substring(CONVERT(VARCHAR(4),YEAR(GETDATE())),3,4)+ '-'+  CONVERT(VARCHAR(2),@stringMon)+'-001';
            end
            ELSE
--custom order id format (always XXX):
            begin
            set @relativeID =(SELECT [purchaseOrderRef] FROM [Products_SumOrders] WHERE orderid=@maxOrderID);
            set @relativeID = Substring(@relativeID,LEN(@relativeID)-(Charindex('-', REVERSE(@relativeID))-2),LEN(@relativeID));
            print(CONVERT(int,@relativeID));
            IF CONVERT(int,@relativeID) < 9
                set @relativeID ='00' +  CONVERT(VARCHAR(2),@relativeID+1) ;
                ELSE
                begin
                if CONVERT(int,@relativeID) < 99
                set @relativeID ='0' +  CONVERT(VARCHAR(3),@relativeID+1) ;
                else
                set @relativeID = CONVERT(VARCHAR(3),@relativeID+1) ;
                end
            set @maxOrderRef =  Substring(CONVERT(VARCHAR(4),YEAR(GETDATE())),3,4)+ '-'+  CONVERT(VARCHAR(2),@stringMon)+'-'+ CONVERT(VARCHAR(3),@relativeID);
            end
            print(@maxOrderRef);
            UPDATE Products_SumOrders
            SET purchaseOrderRef =  @maxOrderRef
            FROM inserted  INNER JOIN [Products_SumOrders]  On inserted.orderid = [Products_SumOrders].orderid
        END 

        GO

Upvotes: 0

Tikas Mamed
Tikas Mamed

Reputation: 89

If you have a field DATE or DATETIME in your table then this solution maybe can help you.

Let say your table name my_table and has PK id (INT) and also a field bila (DATE). I just need to get last (biggest) id in current month from my_table then add by 1.

SET @mos= (SELECT MAX(id) FROM my_table WHERE MONTH(`bila`) = MONTH(NOW()) AND YEAR(`bila`) = YEAR(NOW()));

SET @mos = IF(
    @mos IS NULL,
    CONCAT(YEAR(NOW()),MONTH(NOW()),'001'),
    @mos + 1
    );

Then u can use @mos in your query next

Upvotes: 1

spencer7593
spencer7593

Reputation: 108490

To reset the AUTO_INCREMENT value, drop and recreate the table1_seq table. Given your example, a TRUNCATE statement would be sufficient (given that there aren't any foreign keys, and we assume the table is using either the MyISAM or InnoDB engine).

TRUNCATE TABLE table1_seq ;

(MySQL behavior for this statement is to create a new, empty table, with the AUTO_INCREMENT set back to the value when the table was created.)

This effectively achieves the same result as a DROP table followed by CREATE table.

That answers the question you asked. As a side note, generating a key value this way usually turns out to be a bad idea.

Upvotes: 0

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