I have a very basic question about JDOQL with GAE/J. Hope someone can
shine light on this:
I have modeled two persistent objects Employee and ContactInfo such
that Employee contains an instance of ContactInfo, as follows:
ContactInfo.java
import com.google.appengine.api.datastore.Key;
// ... imports ...
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class ContactInfo {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private String city;
// ...
}
Employee.java
import ContactInfo;
// ... imports ...
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Employee {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
private Integer salary;
@Persistent
private ContactInfo contactInfo;
Integer getSalary() {
return salary;
}
void setSalary(Integer salary) {
this.salary = salary;
}
ContactInfo getContactInfo() {
return contactInfo;
}
void setContactInfo(ContactInfo contactInfo) {
this.contactInfo = contactInfo;
}
// ...
}
I am able to create instances of Employee with relevant ContactInfo
objects. However, I am not able to query for Employee which uses a
field on the ContactInfo object. E.g. If I want to retrieve only those
employees whose salary > 10000 AND ContactInfo.city == "New York", how
do I construct such a query?
If I just want to query on the field in the Employee object, I get the
results, but when I use a field in the sub-object of Employee (i.e.
ContactInfo) I get an error.
Any help???
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