Re: Mapping CHAR column to String

[Tobias Trelle]

Hi Milosz,


Miłosz Tylenda-3 wrote:
> 
> You might want to experiment with @Strategy or @Externalizer. See the
> links below.
> 

Thanks. I implemented a custom ValueHandler:

public class CharValueHandler extends AbstractValueHandler {
 ...
    @Override
    public Object toDataStoreValue(ValueMapping vm, Object val, JDBCStore
store) {
        if (val instanceof String) {
            return pad((String) val, getLength(vm));
        } else {
            return val;
        }
    }

    @Override
    public Object toObjectValue(ValueMapping vm, Object val) {
        if (val instanceof String) {
            return trim((String) val);
        } else {
            return val;
        }
    }

}

where trim(..) and pad(...) are some string helper methods. This works fine.
But I have to annotate every single attribute like this:

@Column(unique = true, length = 50)   
@Strategy("com.xxxx.beispielanwendung.firmenverwaltung.entity.CharValueHandler")
private String name;

Is there a more generic way? I'd like to register this strategy for all
columns of type CHAR or for all String attributes. Any hints?

TIA,
Tobias

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