You can view the issue detail at the following URL:
<http://nagoya.apache.org/scarab/issues/id/TRQS43>
Type : Enhancement
Issue Id : TRQS43
Reported by: Joe McGlynn
[EMAIL PROTECTED] - ([EMAIL PROTECTED])
Details:
Summary: Should generate J2EE-Style DAO and VO objects
Description: This is an ehancement request that consists of _four_ different (but
complementary) requests.
1) Torque should have factory methods to construct DB-specific DAO Factories
2) These (generated) DB factories should operate only on Value Objects (ie: data
Beans), except possibly returning read-only data in a RowSet. This is very close to
what a Peer is now.
3) The (generated) ValueObjects should be just simple beans that represent a row in
the table, ie: a setter and getter for each value. This is nearly identical to the
generated BaseXXX objects, except the current BaseXXX objects have a private ref to
the Peer object.
4) As a build option it should be possible to have the ValueObjects implement the
DirtyMarker interface (attached)
A common J2EE development pattern is to use a combination of Data Access Objects (DAO)
and Value Objects (VO) behind a SessionBean facade.
DAO Factorys are created via an abstract factory method to return a DB-specific
implementation. DAOs are created from factory methods on these objects:
// returns a concrete DAO factory for Oracle
TorqueDAO myDAO = AbstractTorqueDAO.getFactory(AbstractTorqueDAO.ORACLE);
// returns a concrete DAO object to manipulate data, ie a Peer
com.foo.UserDAO myUserDAO = myDAO.getUser();
// do a select to retrieve data, a List of User objects
List usersList = myUserDAO.doSelect(someCriteria);
// ...the data is displayed, edited, etc...
// persist any changes in the data
Iterator it = usersList.iterator();
while (it.hasNext()) {
User theUser = (User) it.next();
if (theUser.isModified() {
myUserDAO.doUpdate(theUser);
}
else if (theUser.isDeleted() {
myUserDAO.doDelete(theUser);
}
else if (theUser.isNew() {
myUserDAO.doInsert(theUser);
}
Status: New
Priority: High
Vote: High
Functional area: Setup
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