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From Miroslav Šulc <miroslav.s...@startnet.cz>
Subject Re: Using custom classes for field
Date Tue, 30 Dec 2008 22:06:39 GMT
Thank you very much :-)

Miroslav

jason98 napsal(a):
> You could start digging by implementing an instance of AbstractValueHandler.
>
> Implement at least theses three methods:
>
> map(ValueMapping vm, String name, ColumnIO io, boolean adapt) {
>         Column col = new Column();
>         col.setName(name);
>         col.setJavaType(...);
>         col.setTypeName(...); //ddl column type name goes here (for
> db-specific types)
>         return new Column[]{ col };
> }
>
> toDataStoreValue(ValueMapping vm, Object val, JDBCStore store) {
>         if (val == null)
>             return null;
> //conversion goes here
> ...
> }
>
> toObjectValue(ValueMapping vm, Object val) {
>         if (val == null)
>             return null;
> //conversion goes here
> ...
> }
>
> More details on custom mapping is here:
> http://openjpa.apache.org/builds/1.0.2/apache-openjpa-1.0.2/docs/manual/ref_guide_mapping_custom.html
>
>
>
> Miroslav Šulc wrote:
>   
>> Hi,
>>
>> I'd like to migrate my project to JPA using OpenJPA. I use two kinds of
>> custom classes for fields:
>> - classes that encapsulate java.lang.String in some specific way, like
>> PhoneNumber.class etc.
>> - classes that work over special PostgreSQL types inet and macaddr
>> (Inet4Address.class, Inet4Network.class and MACAddress.class)
>>
>> I found out that OpenJPA is easily extensible so it should be possible
>> to support my custom classes, but I am not that experienced so I'd
>> appreciate if someone more experienced could tell me what exactly should
>> I do to make my field classes persistable.
>>
>> Thank you for any hint.
>>
>> Miroslav
>>
>>
>>     
>
>   

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