MS SQL Server Unicode Support

[Dov Rosenberg]

Title: MS SQL Server Unicode Support

We are using Cayenne for some web services alongside our EOF based application. Our application supports unicode formatted characters in the database but in order to support it properly using MS SQL Server apparently we need to change our data types from char, varchar, text to nchar, nvarcahr, ntext. This is no big deal. However in order to properly store the data into those fields and to be able to query against them we need to preface all of the strings with a N – this signals MSSQL Server to use the Unicode encoding for that column. For example say we have a table:

CREATE TABLE "CONTENTDATA" (
    RECORDID    NVARCHAR(64)        NOT NULL ,
    XML         NTEXT               NULL ,
    CONSTRAINT PK_CONTENTDATA PRIMARY KEY (RECORDID)
);

In order to insert unicode characters into that table I need to generate a SQL statement like:

INSERT into CONTENTDATA (RECORDID, XML) values (N’1234ABC’, N’<MYXML>....</MYXML>’);

Notice the N in front of the strings I am inserting. In order to query on this table properly I need to add the N in front of the WHERE clause pieces such as:

SELECT * from CONTENTDATA where xml like N’<MYXML>%’;

I only need to put the N when the data contains unicode characters – but I really won’t know that so I probably need to do it all of the time.

I am looking for the correct place in both cayenne and EOF to add the N’ to the queries (INSERTs, and WHERE clauses). Any help or suggestions would be HIGHLY appreciated.

BTW – it seems that Oracle can at least tolerate this unusual SQL format. MSFT says that it is SQL 92 compliant but I haven’t found anything documenting it yet.



--
Dov Rosenberg
Conviveon/Inquira
Knowledge Management Experts
http://www.conviveon.com
http://www.inquira.com

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