生成此范围内的收据编号 [英] Generate a receipt number in this range

问题描述

如何在以下范围内生成唯一的收据编号: GA00000-GZ99999?我不允许使用'I'和'O'字母，因此GI00000-GI99999& GO00000-GO99999将被排除在外.

How would I go about generating a unique receipt number in the following range: GA00000-GZ99999? I am not allowed to use the 'I' and 'O' letters so GI00000-GI99999 & GO00000-GO99999 would be excluded.

理想情况下，我想在T-SQL中创建它，但也可以在VB.Net中创建它.该编号将存储在SQL中，在生成下一个编号之前，我可以对其进行访问.它们不必是顺序的.

Ideally, I'd like to create this in T-SQL but can also do it in VB.Net. This number will be stored in SQL and I can access it prior to generating the next one. They do not have to be sequential.

谢谢.

推荐答案

我决定按照以下步骤进行操作:

I decided to do it as the following:

CREATE FUNCTION [dbo].[fn_generateReceiptNumber]() 
RETURNS NCHAR(7)
AS
BEGIN
    -- Declare the return variable here
    DECLARE @result NCHAR(7);   
    DECLARE @prefix NCHAR(1);
    DECLARE @suffix INT;
    DECLARE @currentMax NCHAR(7);

    SELECT @currentMax = MAX(ISNULL(fp.CustomReceiptNo, 'GA00001')) FROM dbo.FinPayment fp;

    SELECT @prefix = SUBSTRING(@currentMax,2,1);
    SELECT @suffix = CAST(SUBSTRING(@currentMax,3,7) AS INT);

    IF((@suffix + 1) > 99999)
    BEGIN
        SELECT @suffix = 0;
    END
    ELSE
    BEGIN
        SELECT @suffix = @suffix + 1;
    END

    IF(@suffix = 0)
    BEGIN
        IF(@prefix = 'Z')
        BEGIN
            RETURN -1;
        END
        ELSE
        BEGIN
            IF(NCHAR(UNICODE(@prefix)+1) IN ('I', 'O'))
            BEGIN
                SELECT @prefix = NCHAR(UNICODE(@prefix)+2);
            END
            ELSE
            BEGIN
                SELECT @prefix = NCHAR(UNICODE(@prefix)+1);
            END
        END
    END

    -- Return the result of the function
    SELECT @result = NCHAR(71) + @prefix + CAST(RIGHT('00000' + RTRIM(@suffix), 5) AS NCHAR(5));
    RETURN @result;

END
GO

感谢大家的投入. 史蒂夫.

Thank you everyone for the input. Steve.

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