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Re: [eclipselink-users] Best way to support case insensitive alphanumeric sorting..
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You can get the type from the mapping for a particular attribute like this:
DirectToFieldMapping dtfMapping =
descriptor.getMappingForAttributeName(<directAttributeName>);
Class mappingType = dtfMapping.getAttributeClassification();
Notice that the type will be a java class rather than a database type.
-Tom
On 11/06/2013 9:45 AM, vaidya nathan wrote:
From the documentation , I see that we cant use this for non String columns
like say Numeric columns.
For eg, if the column is a numeric , then this will not work ..
Expression exp = (ascending ? exp.toLowerCase().ascending() :
exp.toLowerCase().descending()) ;
Is there a way in which we can get meta data information about the column and
then have this sort something like
if (column is String)
{
Expression exp = (ascending ? exp.toLowerCase().ascending() :
exp.toLowerCase().descending()) ;
}
else
{
Expression exp = (ascending ? exp.ascending() : exp.descending()) ;
}
Or is there any other way in which we can do this. If possible please furnish me
some sample codes too or point me to some samples where we are doing this .
Also Dennis you said that didn't work . Can you elaborate please? What issues
did you have ?
Thx for all your response
Vaidya
On Thu, Jun 6, 2013 at 9:11 AM, Dennis Fuglsang <dennis.fuglsang@xxxxxxxxxx
<mailto:dennis.fuglsang@xxxxxxxxxx>> wrote:
I had a similar requirement and initially tried using the UPPER operator in
the ORDER BY clause but that did not work for me. For example: "SELECT
a.ID, a.name <http://a.name> FROM Table a ORDER BY UPPER(a.name
<http://a.name>)"
What did work for me was specifying an upper-cased form of the column to
sort on in the SELECT clause. For example: "SELECT a.ID, a.name
<http://a.name>, UPPER(a.name <http://a.name>) AS name_order FROM Table a
ORDER BY name_order"
-----Original Message-----
From: Tom Ware
Sent: Thursday, June 06, 2013 9:05 AM
To: eclipselink-users@xxxxxxxxxxx <mailto:eclipselink-users@xxxxxxxxxxx>
Subject: Re: [eclipselink-users] Best way to support case insensitive
alphanumeric sorting..
EclipseLink provides toUpperCase() and toLowerCase() expressions and JPA
provides UPPER and LOWER operators. For queries I expect you could use
those operators in the ORDER BY part of your query to sort.
If you are talking about a mapping, you could use an EclipseLink
DescriptorCustomizer to add ordering by an EclipseLink expression to the
selection query. Roughly:
OneToManyMapping oneToManyMapping =
(OneToOneMapping)descriptor.getMappingForAttributeName("attributeName");
ExpressionBuilder builder =
oneToManyMapping.getSelectionQuery().getExpressionBuilder();
Expression orderExpression =
builder.get("postalCode").toLowerCase().ascending();
oneToManyMapping.getSelectionQuery().addOrdering(orderExpression);
-Tom
On 05/06/2013 11:54 AM, vaidya nathan wrote:
> Hi,
>
> What is the best way to support case insensitive alphanumeric sorting
> using jpa2 and eclipselink ? An example of what i would like to
> achieve is to sort on something similiar to the canada zips which could
be alphanumeric..
>
> We are using Eclipselinks ReadAllQuery and Expression language to
> build our queries and the queries that we have so far is like this..
>
> SELECT * FROM
> (SELECT a.*, ROWNUM rnum FROM
> (SELECT DISTINCT t1.ID AS a1,<colname>
> FROM <Table> ORDER BY t0.<colname> ASC) a WHERE ROWNUM <= ?) WHERE
rnum > ?
> )a
>
>
> Thx
>
>
>
>
> _______________________________________________
> eclipselink-users mailing list
> eclipselink-users@xxxxxxxxxxx <mailto:eclipselink-users@xxxxxxxxxxx>
> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>
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