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From "Joris Portegies Zwart (JIRA)" <ibatis-...@incubator.apache.org>
Subject [jira] Commented: (IBATIS-333) Patch which allow to subsititute property with column name from ResultMap in dynamic sql
Date Thu, 28 Sep 2006 11:33:56 GMT
    [ http://issues.apache.org/jira/browse/IBATIS-333?page=comments#action_12438406 ] 
Joris Portegies Zwart commented on IBATIS-333:

I agree with Andrey.

In our application we need to support showing PaginedResultLists in the GUI, with the requirement
that the user can sort on any column by clicking on the column header.

Since the list is paginated, we cannot sort in memory on the frontend, so we need to re-query
the database, adding the proper ORDER BY clause. As Andrey pointed out, it is a very bad idea
to have knowledge of the actual database column names in the frontend, so we would like to
be able to tell iBatis to sort on a given Java property, and let iBatis figure out to which
this property is mapped.

> Patch which allow to subsititute property with column name from ResultMap in dynamic
> ----------------------------------------------------------------------------------------
>                 Key: IBATIS-333
>                 URL: http://issues.apache.org/jira/browse/IBATIS-333
>             Project: iBatis for Java
>          Issue Type: New Feature
>          Components: SQL Maps
>    Affects Versions: 2.2.0
>            Reporter: Andrey
>         Attachments: insertColumnName.patch
> In situtation, when i need to implement sorting, I need to create such monster, like
abator creates for me. But
> if i only need sorting, here should be mapping beetween columns and properties (if they
specified explicitly
> in ResultMap). In this case, i can write 
>     <resultMap id="dynamicAccountResult" class="testdomain.Account">
>         <result column="ACC_ID" property="id"/>
>         <result column="ACC_FIRST_NAME" property="firstName"/>
>         <result column="ACC_LAST_NAME" property="lastName"/>
>         <result column="ACC_EMAIL" property="emailAddress"/>
>     </resultMap>
>   <select id="dynamicInsertColumnName"
>     parameterClass="string"
>     resultMap="dynamicAccountResult">
>     select
>       ACC_ID,
>       ACC_LAST_NAME,
>       ACC_EMAIL
>     from ACCOUNT
>     <dynamic>
>       <insertColumnName prepend="where"> = 1</insertColumnName>  <!--
ibatis replace this with column mapped for "id" passed as unnamed property -->
>       <insertColumnName prepend="order by"/> 
>     </dynamic>
>   </select>
>   public void testInsertColumnName() throws SQLException {
>     List list = sqlMap.queryForList("dynamicInsertColumnName", "id"); // Here we pass
our property name
>     assertEquals(1, list.size());
>   }
> SQL will be
>     select
>       ACC_ID,
>       ACC_LAST_NAME,
>       ACC_EMAIL
>     from ACCOUNT
>      where ACC_ID = 1
>      order by ACC_ID
> In any case, we can pass some AccountCriteria which will hold a list with soring properties
names and we can iterate in dynamic sql
> and get multiply field "order by" clause
> PS: Not all things tested yet. No errors thrown. This is alpha of this feature. This
is proof of conecpt (due of little amount of structural
> changes in other ibatis classes). If developers wan't this feature and agree with my
decisions, I'll implement all other bells and whishes
> like error checking, tests and may be other extensions for this tag.

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