ibatis-user-java mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "OBender" <osya_ben...@hotmail.com>
Subject feature request for iBatis3
Date Wed, 16 Dec 2009 22:17:35 GMT
Hi All,

 

I guess this is a corner case but it is pretty important one for projects
with legacy data models.

Let say there is a table in DB that contains:

 

Column                Type

id                            int

s1                            string

s2                            string

s3                            string

 

 

Also let say it is modeled (historically) by two immutable objects:

 

public class ObjX 

{

                private final int id;

                private final String s1;

                private final ObjY objY;

 

                public    ObjX( int id, String s1, ObjY objY ) 

{

                                ...

                }

}

 

public class ObjY 

{

                private final String s2;

                private final String s3;

 

                public    ObjY( String s2, String s3 ) 

{

                                ...

                }

}

 

In this case there seems to be no way to build a result map for ObjX in
iBatis without changing ObjX code but what if we cannot change it?

 

It would be nice if we could use resultMap in <constructor>/<arg> element.

This way one could write something like:

 

<resultMap type="ObjX" id="ObjXResult">

        <constructor>

            <idArg column="id" javaType="_int" />

            <arg column="s1" javaType="String" />

            <arg javaType="ObjY" resultMap="ObjYResult"/>

        </constructor>

</resultMap>

 

<resultMap type="ObjY" id="ObjYResult">

        <constructor>

            <arg column="s2" javaType="String" />

            <arg column="s3" javaType="String" />

        </constructor>

</resultMap>

 

Comparable result could be achieved with TypeHandler but it will require
column names to be hardcoded in the TypeHandler implementation also will
require adding one TypeHandler per each such a case.

 

Thanks 


Mime
View raw message