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  1. #1
    Join Date
    Jun 2011

    Invalid object name 'dual'.

    Hi all, any help here would be appreciated. After spending an hour or two getting NHibernate to work I came across the error
    (Toggle Plain Text)

    Invalid object name 'dual'.

    Can anybody shed light on what is causing this. The error occurs when updating/inserting into the DB. I'm using MySQL 2005 server and nhibernate 2.2 in vs2010. I'm new to databases so this has really stumped me. I've read that dual is an additional table generated by oracle but as I havnt called dual once within my code I'm unsure as to why I get the error or what it even is.
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    invalid object name 'dual'.
    Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

    Exception Details: System.Data.SqlClient.SqlException: Invalid object name 'dual'.

    Source Error:

    Line 50: {
    Line 51: trans.Rollback();
    Line 52: throw ex;
    Line 53: }
    Line 54: }

    Source File: C:\Users\oem\Desktop\ProjectSite\ProjectSite\App_Code\DAO\GenericDAO.cs Line: 52

    Stack Trace:

    [SqlException (0x80131904): Invalid object name 'dual'.]
    System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +109
    System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +126
    System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +239
    System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2311
    System.Data.SqlClient.SqlDataReader.ConsumeMetaData() +33
    System.Data.SqlClient.SqlDataReader.get_MetaData() +83
    System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +310
    System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +1034
    System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +242
    System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +20
    System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +144
    System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +10
    System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader() +12
    NHibernate.AdoNet.AbstractBatcher.ExecuteReader(IDbCommand cmd) +278
    NHibernate.Id.SequenceGenerator.Generate(ISessionImplementor session, Object obj) +93

    [GenericADOException: could not get next sequence value[SQL: select userID_seq.nextval from dual]]
    ProjectSite.DAO.GenericDAO`1.InsertOrUpdate(T obj) in C:\Users\oem\Desktop\ProjectSite\ProjectSite\App_Code\DAO\GenericDAO.cs:52
    ProjectSite.Pages.CreateProfile.btnSubmit_Click(Object sender, EventArgs e) in C:\Users\oem\Desktop\ProjectSite\ProjectSite\Pages\CreateProfile.aspx.cs:83
    System.Web.UI.WebControls.Button.OnClick(EventArgs e) +113
    System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112
    System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
    System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
    System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5347

    If you need to know any more let me know, thanks.

  2. #2
    Join Date
    Apr 2009

    Re: Invalid object name 'dual'.

    DUAL does not exist with SQL server.
    DUAL is only for Oracle.

    There is no DUAL table in SQL Server. In fact, you don't need one in SQL Server, as you can have a SELECT statement without a FROM clause.

    For example, consider the following SELECT statement in Oracle:

    SELECT 'Something'

    In SQL Server, the same result can be obtained by the following command:

    SELECT 'Something'

    If you are porting some code from Oracle into SQL Server and if you don't want to remove all references to DUAL table, then just create a DUAL table in your database using the following commands:

    DUMMY varchar(1)

    (Source: http://vyaskn.tripod.com/oracle_sql_...quivalents.htm )

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