Question

I have a table in an Oracle Database like this

ID   | LABEL
------------
 1   |  label alpha 1
 2   |  label alpha 2
 3   |  label alpha a

when I do a select in an application like Squirrel like this :

select * FROM MA_TABLE order by LABEL asc

I get :

ID   | LABEL
------------
 1   |  label alpha 1
 2   |  label alpha 2
 3   |  label alpha a

which is fine !

but When I execute the same request using MyBatis :

<select id="selectMaTable" resultMap="resultMap" >
  Select * FROM MA_TABLE order by LABEL asc
</select>

I get :

ID   | LABEL
------------
 3   |  label alpha a
 1   |  label alpha 1
 2   |  label alpha 2

The alphabetic characters come before the numeric characters… why ??

thanks in advance,

Antoine

Ps : I am using org.mybatis:mybatis:jar:3.0.5 and com.oracle:ojdbc6:jar:11.2.0.2.0 for database access

Edit :
this linked help me a bit also

Thanks to Soulcheck’s remark, I found that if I change the order by clause with ORDER BY NLSSORT(ATL_SIT.ATL_SIT_LIB, ‘NLS_SORT=BINARY’) it works…

Does anyone knows how to force NLS_SORT=BINARY with myBatis ?
(It is already set on my Oracle database in NLS_DATABASE_PARAMETERS)

Answer 1

It looks like it might be a locale issue. Connect with squirrel and check what NLS_LANG it sets, then check what locale uses your java app. Another parameter that can influence sort is NLS_SORT.

You can check the value of both by issuing:

select parameter,value from NLS_DATABASE_PARAMETERS where parameter in('NLS_LANGUAGE','NLS_SORT');

Then you can test it in java by using:

Locale.getDefault()

and set it by using:

Locale.setDefault(Locale)

or by adding jvm parameters:

-Duser.country=en -Duser.language=en

edit

spring forums recommend creating a logon trigger which sets NLS_SORT environmental variable on user logon. It’s not MyBatis, but jdbc anyway so should work in your case.