Howto - Sequence in Oracle and Identity in SQL work

Oct 5, 2009 at 3:30 PM
Edited Oct 5, 2009 at 3:44 PM

Hi all,

can I have an example about using sequences in Oracle and SQL Server?

Documentation is a little bit confusing and I’m getting some errors. Please can you provide me a cs entity, save method and mapping file, just with two properties called myID (int32 format) and myText (string format)?

Thanks a million

Josep Balague

 

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Hi, can I have an example about using sequences in Oracle and SQL Server? Documentation is a little bit confusing and I’m getting some errors. Please can you provide me cs entity, save method and mapping file, just with two properties called myID and myText?

Thanks a million

Josep Balague

Oct 5, 2009 at 4:13 PM

My example is:

Mapping.xml

  <Entity type="myNamespaces:Test" table="TEST">

    <Id field="my_ID">

      <Generator name="native">

        <Property name="dbType">Int32</Property>

        <Property name="seed">1</Property>

      </Generator>

    </Id>

 

    <Attribute name="Id" field=" my_ID " db-type="Int32" not-null="true" />

    <Attribute name="Text" field="my_Text" db-type="String" size="50" not-null="false" />

  </Entity>

SQL 2008 table script

/****** Object:  Table [dbo].[ANOMALIASCONFIGEMPLEADOS]    Script Date: 10/05/2009 17:58:46 ******/

SET ANSI_NULLS ON

GO

 

SET QUOTED_IDENTIFIER ON

GO

 

CREATE TABLE [dbo].[TEST](

       [my_ID] [numeric](18, 0) IDENTITY(1,1) NOT NULL,

       [my_Text] [nvarchar](50) NULL

) ON [PRIMARY]

 

GO

Oracle 9 table script

CREATE TABLE "DB"."TEST" ( "my_ID" NUMBER (38, 0) NOT NULL ,

"my_Test" VARCHAR2 (50) NULL , "ACE_TIPO" VARCHAR2 (1) NULL ,

CONSTRAINT "PK_TEST" PRIMARY KEY (  "my_ID"  ) )

 

CREATE SEQUENCE my_ID START WITH 1 

 

Entity.cs

namespace MyNamespace

{

    using System;

    using System.Collections.Generic;

 

    [Serializable]

    public class Test

    {

        private Int32 _Id = 0;

        private string _Text = "";

 

        public Int32 Id

        {

            get { return _Id; }

            set { _Id = value; }

        }

 

        public string Text

        {

            get { return _Text; }

            set { _Text = value; }

        }

    }

}

 

Save method

        internal static void Save(EussContext objContext, Test item)

        {

            objContext.Context.BeginTransaction();

            objContext.Context.Serialize(item);

            objContext.Context.CommitTransaction();

        }

Exception in red line:

SQL: "Cannot insert explicit value for identity column in table 'TEST' when IDENTITY_INSERT is set to OFF."

Oracle: [System.Data.OracleClient.OracleException] = {"ORA-01400: cannot insert NULL at  (\"db\".\"TEST\".\"my_ID\")\n"}

 

Please can you help me?

Yours,

Josep Balague

 

Coordinator
Oct 6, 2009 at 5:26 AM

Actually the Id doesn't need to be mapped twice. You should remove this line from your mapping file:

<Attribute name="Id" field=" my_ID " db-type="Int32" not-null="true" />

 

Oct 6, 2009 at 6:27 AM
Edited Oct 6, 2009 at 12:06 PM

Hi Sebastien,

Your suggestions solve the problem in SQL (incluse my_ID receive new @@IDENTITY value). But in ORACLE I'm still obtaining this exception:

 * "ORA-01400: no se puede realizar una inserción NULL en (\"...\".\"TEST\".\"my_ID\")\n"

   (In English "ORA-01400: cannot insert NULL at  (\"db\".\"TEST\".\"my_ID\")\n")

Please can you help me?

Yours,

Josep Balague

Oct 6, 2009 at 12:24 PM

Sebastien,

If you remove

<Attribute name="Id" field=" my_ID " db-type="Int32" not-null="true" />

you can't Load objects over Id constraint because Id property is not mapped (when you Load<Test>(typeof(Test), "[Id != 37]") an Evaluant.Uss.SqlMapper.MappingNotFoundException exeption is raised)

So it's not good solution remove this line because although Id is autogenerated in SQL and Oracle, it may be used in some scenarios.

Thanks a million

Josep Balague

Coordinator
Oct 6, 2009 at 12:59 PM

You should really read the documentation ;) Actually Id is not a property like the others. In Euss you need to use the id() function in opath queries. Thus doing:

Load<Test>(typeof(Test), "[ id('37') ]");

Oct 6, 2009 at 1:54 PM

Sebastien,

thanks a lot for your quick answer. Load<Test>(typeof(Test), "[ id('37') ]"); solves my ignorance about identities in Evaluant. Now there is a new exception in my party:

 

public static void Guardar_ServicioMensajeria(

     EussContext objContext, List<Test> lstItems)

{

objContext.Context.BeginTransaction();

objContext.Context.Serialize(lstItems);

objContext.Context.CommitTransaction();

}

ORA-02289: la secuencia no existe

(in english ORA-02289: sequence does not exist)

In my old style code, .nextval works right.

SQL now is working right after applying your change.

 

Yours,

Josep Balague

 

PS: short code-examples for all supported DB engines should be very welcome (I guess code ought to be always the same... only engine.config is which changes as documentation says)

Coordinator
Oct 6, 2009 at 1:58 PM

If the code has to be different to work on different databases, then this is a BUG for us. Hence, we don't need to provide different examples, even for XML, memory, lucene and other engines ;)

Concerning Oracle, did you use the command line tool to generate the DDL script, or even used InitializedRepository() to create the tables ? In the case or Oracle it also creates the sequence. Otherwise you can do it manually, but I strongly recommend to call InitializeRepository() once to create all the tables an resources.

 

Oct 7, 2009 at 6:06 AM

Sebastien,

I'm gonna change my strategy as I'm not solving the problem.

Thanks for your help

 

Oct 7, 2009 at 8:47 AM

Sebastien,

All my problem in Oracle is due the name of the sequence. Code is assuming:

public string FormatSequenceName(string tablename)
        {
            return FormatAttribute(string.Concat(tablename, SEQPREFIX));
        }

and our sequence definitions are the name of the field. How can I tell to euss about using my name instead of table_SEQ name?

Thanks,

Josep Balague

 

PS:

About reading suggestions and claimed examples : InitializedRepository() is not documented in current web docx. I can't use this method because deletes current information. So it's not a good solution neither answer :-)

 

 

Coordinator
Oct 7, 2009 at 8:58 AM

Then I will add a new mapping property which will let you define the custom name if the sequence for a table. It should take some minutes.

Coordinator
Oct 7, 2009 at 9:13 AM

After checking euss's code, I think there is no issue and that you should handle it by yourself. The method you reference (FormatSequenceName) is only used by the database generation process, which you don't want to use. So if you prefer to create the db by yourself, with your own naming scheme, it's up to you to create a correct TRIGGER base on your own SEQUENCE name. If you need the SQL code to create this trigger, then generate the DDL using Euss tool named scripddl.exe (documentation page 69), and change the sequence name to the one you want.