Custom unique ID.

Hello all,
I baddly need to create my own datatype, that will be able to generate
itself as unique id.
1. my user defined data type is based on char(14).
2. structure of this type is
YYYYMMDDSCIDCONT
YYYY = year of record creation
MM = month of record creation
DD = day of record creation
SCID = value of SCID column in the table
CONT = counter (like identity seed) next unique value in the table
I can to do it by my .NET application, or i can make unique keys with all
values in the table, but I would like to create my own SQL type, that will
be able to do what i described. Is it possible?
Thanks.Maybe I should better explain this or ask for some questions.
My task Im going to do:
1) create my own User Defined Data Type based on char(16) named for example
MyIDType
2) create rule that will check if the value is in right format.
3) create function, that will able to generate new id with parameters
datetime, scid. This fuction will parse the datetime, scid and newly created
counter into char(16) and into MyIDType.
Questions:
1) can I create rule that contain more complex check than one rule row ?
2) How to ask for source table in T-SQL function. I mean for the table which
initiated running of my function. Im going to put this function onto
defaultValue of the column that will be type of MyIDType. The function will
suppose, that in this table will exist columns CreationDateTime and SCID.
I know, how to do it in C#. The workflow of this function should be (it is
an example, dont check any syntax):
FUNCTION GetNewMyID (@.scid char(4))
DECLARE @.datetimenow char(8)
DECLARE @.lastid char(4)
DECLARE @.partOfMyID char(12)
@.datetimenow = FORMAT( GETDATE()) // in format YYYYMMDD
for(int i = 1; i < 10000; i++)
{
@.partOfMyID = @.datetimenow + @.scid + i.ToString("0000")
SELECT MyID FROM [executingTable?] WHERE MyID LIKE @.partOfMyID
if(there is no row)
return @.partOfMyID;
}
I hope, the good programer will understand this weird construction. :)))
Thanks.
"Mirek Endys" <MirekE@.community.nospam> wrote in message
news:%23$vH%23RZTGHA.196@.TK2MSFTNGP10.phx.gbl...
> Hello all,
> I baddly need to create my own datatype, that will be able to generate
> itself as unique id.
> 1. my user defined data type is based on char(16).
> 2. structure of this type is
> YYYYMMDDSCIDCONT
> YYYY = year of record creation
> MM = month of record creation
> DD = day of record creation
> SCID = value of SCID column in the table
> CONT = counter (like identity seed) next unique value in the table
> I can to do it by my .NET application, or i can make unique keys with all
> values in the table, but I would like to create my own SQL type, that will
> be able to do what i described. Is it possible?
> Thanks.
>|||hi Mirek,
Sure.
I understand that function but what does 'scid' mean? Let me know.
Current location: Alicante (ES)
"Mirek Endys" wrote:

> Maybe I should better explain this or ask for some questions.
> My task Im going to do:
> 1) create my own User Defined Data Type based on char(16) named for exampl
e
> MyIDType
> 2) create rule that will check if the value is in right format.
> 3) create function, that will able to generate new id with parameters
> datetime, scid. This fuction will parse the datetime, scid and newly creat
ed
> counter into char(16) and into MyIDType.
> Questions:
> 1) can I create rule that contain more complex check than one rule row ?
> 2) How to ask for source table in T-SQL function. I mean for the table whi
ch
> initiated running of my function. Im going to put this function onto
> defaultValue of the column that will be type of MyIDType. The function wil
l
> suppose, that in this table will exist columns CreationDateTime and SCID.
> I know, how to do it in C#. The workflow of this function should be (it is
> an example, dont check any syntax):
> FUNCTION GetNewMyID (@.scid char(4))
> DECLARE @.datetimenow char(8)
> DECLARE @.lastid char(4)
> DECLARE @.partOfMyID char(12)
> @.datetimenow = FORMAT( GETDATE()) // in format YYYYMMDD
>
> for(int i = 1; i < 10000; i++)
> {
> @.partOfMyID = @.datetimenow + @.scid + i.ToString("0000")
> SELECT MyID FROM [executingTable?] WHERE MyID LIKE @.partOfMyID
> if(there is no row)
> return @.partOfMyID;
> }
> I hope, the good programer will understand this weird construction. :)))
> Thanks.
>
> "Mirek Endys" <MirekE@.community.nospam> wrote in message
> news:%23$vH%23RZTGHA.196@.TK2MSFTNGP10.phx.gbl...
>
>|||Hi Enric
the SCID is variable - value that is contained in inserted record... or
passed by function parameter.
"Enric" <vtam13@.terra.es.(donotspam)> wrote in message
news:6DE5E6D0-9B7A-421C-A6BF-14E33D967B06@.microsoft.com...
> hi Mirek,
> Sure.
> I understand that function but what does 'scid' mean? Let me know.
> Current location: Alicante (ES)
>
> "Mirek Endys" wrote:
>|||Hi Mirek,
As for the SQL 2005 clr UDT, it is still quiet limited, e.g, if the data
type used in the UDT is not in the following basic types:
bool, byte, sbyte, short, ushort, int, uint, long, ulong, float, double,
SqlByte, SqlInt16, SqlInt32, SqlInt64, SqlDateTime, SqlSingle, SqlDouble,
SqlMoney, SqlBoolean
we have to implenent our userdefined serialization. For type validation, we
can define the validation rules in a certain method and mark it with the
"ValidationMethodName" attribute.
And for the constructing a new UDT instance based on some parameters or
other info in the current database, this is hard to be done through the UDT
itself since UDT just provide a "parse" function which help use create UDT
instance from a string representation(also a "ToString" method help return
string representation from a UDT instance). For your scenario, maybe we
have to define an additional user defined funciton(CLR based) to the work.
#User-Defined Type Requirements
http://msdn2.microsoft.com/en-us/library/f33b06h1.aspx
Regards,
Steven Cheng
Microsoft Online Community Support
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This posting is provided "AS IS" with no warranties, and confers no rights.|||You can create static method(s) in your UDT to create. Kinda like a static
constructor. Something like:
public static MyID Create(SqlDateTime dt, SqlInt id, SqlInt counter)
{
// ...
return new MyID(dt, id, counter);
}
Use the sql types that make sense for your needs.
Then you can create an instance something like:
declare @.id MyID
set @.id = MyID.Create(getdate(), 1, 1)
William Stacey [MVP]
"Mirek Endys" <MirekE@.community.nospam> wrote in message
news:%23$vH%23RZTGHA.196@.TK2MSFTNGP10.phx.gbl...
| Hello all,
|
| I baddly need to create my own datatype, that will be able to generate
| itself as unique id.
|
| 1. my user defined data type is based on char(14).
| 2. structure of this type is
| YYYYMMDDSCIDCONT
|
| YYYY = year of record creation
| MM = month of record creation
| DD = day of record creation
| SCID = value of SCID column in the table
| CONT = counter (like identity seed) next unique value in the table
|
| I can to do it by my .NET application, or i can make unique keys with all
| values in the table, but I would like to create my own SQL type, that will
| be able to do what i described. Is it possible?
|
| Thanks.
|
||||Thank for Williams inputs.
This is a good suggestion that directly use a static method on the type.
Regards,
Steven Cheng
Microsoft Online Community Support
========================================
==========
When responding to posts, please "Reply to Group" via your newsreader so
that others may
learn and benefit from your issue.
========================================
==========
This posting is provided "AS IS" with no warranties, and confers no rights.|||Thanks guys,
i thought so, that this will be solution.
"Steven Cheng[MSFT]" <stcheng@.online.microsoft.com> wrote in message
news:wQfSEekTGHA.5536@.TK2MSFTNGXA03.phx.gbl...
> Thank for Williams inputs.
> This is a good suggestion that directly use a static method on the type.
> Regards,
> Steven Cheng
> Microsoft Online Community Support
>
> ========================================
==========
> When responding to posts, please "Reply to Group" via your newsreader so
> that others may
> learn and benefit from your issue.
> ========================================
==========
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>|||Just a note after looking at it again. You need the double "::" to refer to
the static method on a type from tsql. Such as:
set @.id = MyID::Create(getdate(), 1, 1)
William Stacey [MVP]
"Mirek Endys" <MirekE@.community.nospam> wrote in message
news:uYBv3FmTGHA.4792@.TK2MSFTNGP14.phx.gbl...
| Thanks guys,
|
| i thought so, that this will be solution.
|
|
| "Steven Cheng[MSFT]" <stcheng@.online.microsoft.com> wrote in message
| news:wQfSEekTGHA.5536@.TK2MSFTNGXA03.phx.gbl...
| > Thank for Williams inputs.
| >
| > This is a good suggestion that directly use a static method on the type.
| >
| > Regards,
| >
| > Steven Cheng
| > Microsoft Online Community Support
| >
| >
| > ========================================
==========
| >
| > When responding to posts, please "Reply to Group" via your newsreader so
| > that others may
| >
| > learn and benefit from your issue.
| >
| > ========================================
==========
| >
| >
| > This posting is provided "AS IS" with no warranties, and confers no
| > rights.
| >
|
|