Hi Ari,
How can I execute an arbitrary query like the SHOW query to get the map of
property names and default values, I like that idea, I just don't know how to
get a plain query to execute with just a client app. The client has not db
driver lib. Can I use Cayenne to execute an arbitrary query?
Since the method for setting defaults in the db is the same accross the
database depending only on field type I can put together something like the
following to initialize objects following our rules... still it does not work
ROP :( PersistentObject used for client seems to have no way to access the
metadata like CayenneDataObject does, i.e. no getObjEntity()
If I can get that SHOW query going with ROP then I can set up the objects
with the actual defaults in the prePersist() and that would be great!
Here is a method I am using to automatically set up CayenneDataObjects with
company database compliant defaults based on their database type....
private void setNewObjectDefaults(CayenneDataObject CayenneObj)
{
ObjEntity ent = CayenneObj.getObjEntity();
Collection attribs = ent.getAttributes();
for(int i=0;i<=attribs.size()-1;i++)
{
ObjAttribute ObjAtt = (ObjAttribute)attribs.toArray()[i];
DbAttribute att = ObjAtt.getDbAttribute();
String propName = ObjAtt.getName();
Object propertyValue = CayenneObj.readProperty(propName);
System.out.println("att type =
"+TypesMapping.getSqlNameByType(att.getType()));
String type = TypesMapping.getSqlNameByType(att.getType());
if(propertyValue==null)
{
if(type.equals(TypesMapping.SQL_INTEGER))
{
CayenneObj.writeProperty(propName, 0);
}
else if(type.equals(TypesMapping.SQL_DOUBLE))
{
CayenneObj.writeProperty(propName, 0.0000);
}
else if(type.equals(TypesMapping.SQL_TINYINT))
{
CayenneObj.writeProperty(propName, 0);
}
else if(type.equals(TypesMapping.SQL_VARCHAR) ||
type.equals(TypesMapping.SQL_LONGVARCHAR) || type.equals(TypesMapping.SQL_CHAR))
{
CayenneObj.writeProperty(propName, "");
}
}
else
{
System.out.println("Attribute "+propName+" IS
"+propertyValue.toString());
}
}
}
Thanks for all your help. The company I am doing all this for is a T shirt
company, I'd love to make a couple of Cayenne t shirts and send them out to you
guys Ari, and Andrus for helping me out. If you are interested email me on my
private email.
I new to this ORM, so I promise to ask less dumb questions as time goes on!
Thanks,
Adam
Aristedes Maniatis <[EMAIL PROTECTED]> wrote:
I don't think it can be done. As Andrus was suggesting, JDBC doesn't
seem to have a way to read those values from the database schema. The
only portable approach I can think of is using SQLtemplate to create a
dummy object at system startup, read back its values and then delete
that record.
It seems like an unusual request though - can you not simply implement
the default values within Cayenne rather than within the database? Or
else use the mysql command "SHOW CREATE TABLE" to get the default
values and map them onto the right attributes at startup. Then you can
populate the values in prePersist() or wherever is appropriate as each
record is created.
Ari Maniatis
On 23/12/2007, at 10:12 AM, Adam Yocum wrote:
> Hi Ari,
>
> It looks like I can get close with ...
>
> http://cayenne.apache.org/doc/api/org/apache/cayenne/map/DbAttribute.html#getType()
>
> That returns the SQL type that of the DbAttribute, if only I could
> get the Default Value set in the database.
>
> I need something like DbAttribute.getDefaultValue();
>
> suggestions?
>
> Thanks,
> Adam
>
> Aristedes Maniatis wrote:
>
> On 23/12/2007, at 5:30 AM, Adam Yocum wrote:
>
>> 'SHOW columns FROM tablename'
>
> This might be a good starting point:
>
> http://cayenne.apache.org/doc/api/org/apache/cayenne/map/ObjEntity.html#getAttributes()
>
> Ari Maniatis
>
>
>
> -------------------------->
> ish
> http://www.ish.com.au
> Level 1, 30 Wilson Street Newtown 2042 Australia
> phone +61 2 9550 5001 fax +61 2 9550 4001
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>
>
>
>
>
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-------------------------->
ish
http://www.ish.com.au
Level 1, 30 Wilson Street Newtown 2042 Australia
phone +61 2 9550 5001 fax +61 2 9550 4001
GPG fingerprint CBFB 84B4 738D 4E87 5E5C 5EFA EF6A 7D2E 3E49 102A
---------------------------------
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