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From "Andrey Razumovsky" <razumovsky.and...@gmail.com>
Subject Re: MS SQL Server: Select Distinct on text datatype
Date Mon, 04 Aug 2008 07:39:15 GMT
This is definitely MS SQL's issue, not Cayenne's. Only thing I can
recommend, if you can allow that, select all rows and then seed
out duplicate rows manually

2008/8/4, Matthias Moeser <matthias@ish.com.au>:
>
> Hi!
>
> We are using Cayenne with Microsoft SQL Server. We get a
> com.microsoft.sqlserver.jdbc.SQLServerException: "The text data type cannot
> be selected as DISTINCT because it is not comparable."
>
> The problem is that the following query is not allowed in MS SQL Server:
>
> SELECT DISTINCT column FROM table;
>
> where "column" is of datatype "text". So i think that cayenne does
> somewhere such a DISTINCT query on a "text" datatype column.
>
> The datatype "text" in MS SQL server is a variable-length data with a
> maximum length of 2^31 - 1 (2,147,483,647) characters, Varchar() can have
> only maximum 8000 character.
>
> What can I do? I need the "text" datatype.
>
> Thank you
> Matthias
>
>
> org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
> at
> org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.jav
> a:228)
> at
> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.ja
> va:450)
> Caused by: java.lang.Exception: The text data type cannot be selected as
> DISTINCT because it is not comparable.
> com.microsoft.sqlserver.jdbc.SQLServerException: The text data type
> cannot be selected as DISTINCT because it is not comparable.
> at
> com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(Un
> known Source)
> at
> com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(Unknown
> Source)
> at
> com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePrepare
> dStatement(Unknown Source)
> at
> com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PrepStmtExecCmd.
> doExecute(Unknown Source)
> at com.microsoft.sqlserver.jdbc.TDSCommand.execute(Unknown
> Source)
> at
> com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(Unknown
> Source)
> at
> com.microsoft.sqlserver.jdbc.SQLServerStatement.executeCommand(Unknown
> Source)
> at
> com.microsoft.sqlserver.jdbc.SQLServerStatement.executeStatement(Unknown
> Source)
> at
> com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeQuery(Unk
> nown Source)
> at
> org.apache.cayenne.access.jdbc.SelectAction.performAction(SelectAction.j
> ava:73)
> at
> org.apache.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryActi
> on.java:58)
>

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