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我的下一個可持久化類:如何使用JDOQL檢索屬於類的屬性的對象列表?
@PersistenceCapable
public class AppAccount {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
@Persistent
private String companyName;
@Persistent
List<AppUser> users = new ArrayList<AppUser>();
// Getters and Setters and other properties
}
@PersistenceCapable
@EmbeddedOnly
public class AppUser {
@Persistent
private String username;
@Persistent
private String firstName;
@Persistent
private String lastName;
// Getters and Setters and other properties
}
基於應用帳戶ID,我要檢索的用戶的列表:
public static List<AppUser> getUsers(Long application_id) {
PersistenceManager pm = JdoUtil.getPm();
Query q = pm.newQuery(
" select users " +
" from " + AppAccount.class.getSimpleName() +
" where id == idParam" +
" parameters Long idParam");
return (List<AppUser>) q.execute(application_id);
}
我得到了一個錯誤:
WARNING: Candidate class for JDOQL single-string query (AppAccount) could not be resolved
AppAccount
org.datanucleus.exceptions.ClassNotResolvedException: AppAccount
at org.datanucleus.util.Imports.resolveClassDeclaration(Imports.java:194)
at org.datanucleus.store.query.AbstractJDOQLQuery.<init>(AbstractJDOQLQuery.java:114)
at org.datanucleus.store.appengine.query.JDOQLQuery.<init>(JDOQLQuery.java:65)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPluginRegistry.java:572)
at org.datanucleus.store.appengine.DatastorePluginRegistry.createExecutableExtension(DatastorePluginRegistry.java:124)
at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:324)
at org.datanucleus.store.query.QueryManager.newQuery(QueryManager.java:203)
at org.datanucleus.jdo.JDOPersistenceManager.newQuery(JDOPersistenceManager.java:1291)
at org.datanucleus.jdo.JDOPersistenceManager.newQuery(JDOPersistenceManager.java:1234)
at com.softamo.pelicamo.invoices.server.Store.getUsers(Store.java:44)
at com.softamo.pelicamo.invoices.test.server.StoreTest.testGetUsers(StoreTest.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
這是我的解決方案,使用getName()而不是 – BROCK 2010-12-03 13:54:08