Playframework 2.0 使用play和ebean的多个查询
我正在尝试使用一个具有多个关系的查找器进行查询,但一直无法解决这个问题。使用play 2.1.2和ebean 3.1.1(与play打包) 我有一个MyUser类,它有MyContacts和MyContactGroups。MyContactGroups有许多mycontacts。我正在尝试编写一个查询,从中可以获取MyUser的MyContactGroup中的所有MyContacts。下面失败的查询方法是findByContactGroupAndUser 实体包括:Playframework 2.0 使用play和ebean的多个查询,playframework-2.0,ebean,Playframework 2.0,Ebean,我正在尝试使用一个具有多个关系的查找器进行查询,但一直无法解决这个问题。使用play 2.1.2和ebean 3.1.1(与play打包) 我有一个MyUser类,它有MyContacts和MyContactGroups。MyContactGroups有许多mycontacts。我正在尝试编写一个查询,从中可以获取MyUser的MyContactGroup中的所有MyContacts。下面失败的查询方法是findByContactGroupAndUser 实体包括: @Entity @Table
@Entity
@Table(name = "my_user")
public class MyUser extends Model {
@Id
public Long id;
public String name;
@OneToMany(cascade = CascadeType.ALL)
public List<MyContact> myContacts = new ArrayList<MyContact>();
@OneToMany(cascade = CascadeType.ALL)
public List<MyContactGroup> myContactGroups = new ArrayList<MyContactGroup>();
public void addContact(MyContact myContact) {
myContacts.add(myContact);
}
public void addContactGroup(MyContactGroup myContactGroup) {
myContactGroups.add(myContactGroup);
}
public static Model.Finder<Long, MyUser> find = new Model.Finder<Long, MyUser>(
Long.class, MyUser.class);
}
@Entity
@Table(name = "my_contact")
public class MyContact extends Model {
@Id
public Long id;
public String name;
@ManyToOne
public MyUser myUser;
@ManyToMany(mappedBy = "myContacts")
public MyContactGroup myContactGroup;
public static Model.Finder<Long, MyContact> find = new Model.Finder<Long, MyContact>(
Long.class, MyContact.class);
public static Page<MyContact> findByContactGroupAndUser(MyUser myUser, MyContactGroup myContactGroup, int pageSize, int page) {
return find.where(Expr.and(Expr.eq("myContactGroup", myContactGroup),
Expr.eq("myUser", myUser)))
.findPagingList(pageSize).setFetchAhead(false).getPage(page);
}
}
@Entity
@Table(name = "my_contact_group")
public class MyContactGroup extends Model {
@Id
public Long id;
public String name;
@ManyToOne(cascade = CascadeType.ALL)
public MyUser myUser;
@ManyToMany(cascade = CascadeType.ALL)
public List<MyContact> myContacts = new ArrayList<MyContact>();
public void addContact(MyContact myContact) {
myContacts.add(myContact);
}
public static Model.Finder<Long, MyContactGroup> find = new Model.Finder<Long, MyContactGroup>(
Long.class, MyContactGroup.class);
}
我认为这基本上是因为我没有将mappedBy放在正确的实体上,并且可能混合了Ebean直接字段访问和setter/getter访问。在游戏中,他们说您应该只使用setter/getter访问,因为游戏和Ebean代码增强之间存在一些冲突。以下内容直接与Ebean合作,我也能让它在游戏中发挥作用
package app.data;
import com.avaje.ebean.validation.Length;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
/**
* Created by aakture on 3/2/14.
*/
@Entity
@Table(name="o_user")
public class User {
@Id
Integer id;
@Length(max = 20)
String name;
@OneToMany(cascade = CascadeType.ALL)
List<ContactGroup> contactGroups = new ArrayList<ContactGroup>();
@OneToMany(cascade = CascadeType.ALL)
List<Contact> contacts = new ArrayList<Contact>();
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<ContactGroup> getContactGroups() {
return contactGroups;
}
public void setContactGroups(List<ContactGroup> contactGroups) {
this.contactGroups = contactGroups;
}
public List<Contact> getContacts() {
return contacts;
}
public void setContacts(List<Contact> contacts) {
this.contacts = contacts;
}
@Override
public String toString() {
return com.google.common.base.Objects.toStringHelper(this)
.add("id", id)
.add("name", name)
.add("contactGroups", contactGroups)
.toString();
}
}
package app.data;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
/**
* Created by aakture on 3/2/14.
*/
@Entity
@Table(name="o_contact")
public class Contact {
@Id
Integer id;
String name;
@ManyToOne
User user;
@ManyToMany
List<ContactGroup> contactGroups = new ArrayList<ContactGroup>();
public List<ContactGroup> getContactGroups() {
return contactGroups;
}
public void setContactGroups(List<ContactGroup> contactGroups) {
this.contactGroups = contactGroups;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
package app.data;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
/**
* Created by aakture on 3/2/14.
*/
@Entity
@Table(name="o_contact_group")
public class ContactGroup {
@Id
Integer id;
@ManyToOne
User user;
String name;
@ManyToMany(cascade = CascadeType.MERGE, mappedBy = "contactGroups")
List<Contact> contacts = new ArrayList<Contact>();
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<Contact> getContacts() {
return contacts;
}
public void setContacts(List<Contact> contacts) {
this.contacts = contacts;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
package app.data;
导入com.avaje.ebean.validation.Length;
导入javax.persistence.*;
导入java.util.ArrayList;
导入java.util.List;
/**
*由aakture于2014年3月2日创建。
*/
@实体
@表(name=“o_用户”)
公共类用户{
@身份证
整数id;
@长度(最大值=20)
字符串名;
@OneToMany(级联=级联类型.ALL)
List contactGroups=new ArrayList();
@OneToMany(级联=级联类型.ALL)
列表联系人=新建ArrayList();
公共整数getId(){
返回id;
}
公共无效集合id(整数id){
this.id=id;
}
公共字符串getName(){
返回名称;
}
公共void集合名(字符串名){
this.name=名称;
}
公共列表getContactGroups(){
返回联系人组;
}
public void设置联系人组(列出联系人组){
this.contactGroups=contactGroups;
}
公共列表getContacts(){
返回联系人;
}
公共联系人(列出联系人){
这个。联系人=联系人;
}
@凌驾
公共字符串toString(){
返回com.google.common.base.Objects.toStringHelper(此)
.add(“id”,id)
.添加(“名称”,名称)
.添加(“联系人组”,联系人组)
.toString();
}
}
软件包app.data;
导入javax.persistence.*;
导入java.util.ArrayList;
导入java.util.List;
/**
*由aakture于2014年3月2日创建。
*/
@实体
@表(name=“o_联系人”)
公共类联系人{
@身份证
整数id;
字符串名;
@许多酮
用户;
@许多
List contactGroups=new ArrayList();
公共列表getContactGroups(){
返回联系人组;
}
public void设置联系人组(列出联系人组){
this.contactGroups=contactGroups;
}
公共整数getId(){
返回id;
}
公共无效集合id(整数id){
this.id=id;
}
公共字符串getName(){
返回名称;
}
公共void集合名(字符串名){
this.name=名称;
}
公共用户getUser(){
返回用户;
}
公共void setUser(用户){
this.user=用户;
}
}
软件包app.data;
导入javax.persistence.*;
导入java.util.ArrayList;
导入java.util.List;
/**
*由aakture于2014年3月2日创建。
*/
@实体
@表(name=“o\u联系人\u组”)
公共类联系人组{
@身份证
整数id;
@许多酮
用户;
字符串名;
@ManyToMany(cascade=CascadeType.MERGE,mappedBy=“contactGroups”)
列表联系人=新建ArrayList();
公共整数getId(){
返回id;
}
公共无效集合id(整数id){
this.id=id;
}
公共用户getUser(){
返回用户;
}
公共void setUser(用户){
this.user=用户;
}
公共列表getContacts(){
返回联系人;
}
公共联系人(列出联系人){
这个。联系人=联系人;
}
公共字符串getName(){
返回名称;
}
公共void集合名(字符串名){
this.name=名称;
}
}
测试:
公共无效测试(){
用户=新用户();
user.setName(“UserBob”);
保存(用户);
ContactGroup ContactGroup=新的ContactGroup();
contactGroup.setName(“朋友”);
List contactGroupList=新建ArrayList();
contactGroupList.add(联系人组);
user.setContactGroups(contactGroupList);
更新(用户);
user=Ebean.find(user.class).where().eq(“name”,“UserBob”).findUnique();
List contactGroups=user.getContactGroups();
用于(联系人组cg:联系人组){
System.out.println(“联系人组:+cg.getName());
}
触点=新触点();
contact.setName(“ContactSteve”);
user.getContacts().add(contact);
更新(用户);
user=Ebean.find(user.class).where().eq(“name”,“UserBob”).findUnique();
对于(联系人c:user.getContacts()){
System.out.println(“联系人:+c.getName());
}
联系人Steve=user.getContacts().get(0);
ContactGroup friends=user.getContactGroups().get(0);
friends.getContacts().add(contactSteve);
Ebean.saveManyToManyAssociations(朋友,“联系人”);
更新(用户);
user=Ebean.find(user.class).where().eq(“name”,“UserBob”).findUnique();
friends=user.getContactGroups().get(0);
List contacts=friends.getContacts();
用于(联系人c:联系人){
System.out.println(“联系人:+c.getName());
}
contact=Ebean.find(contact.class).where()和(Expr.eq(“user.name”、“UserBob”)、Expr.eq(“contactGroups.name”、“Friends”).findUnique();
System.out.println(“contact:+contact.getName());
}
javax.persistence.PersistenceException: java.util.concurrent.ExecutionException: java.lang.NullPointerException
at com.avaje.ebeaninternal.server.query.LimitOffsetPage.getList(LimitOffsetPage.java:64)
at ApplicationTest.testMyContactGroup(ApplicationTest.java:152)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:202)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
at java.util.concurrent.FutureTask.get(FutureTask.java:111)
at com.avaje.ebeaninternal.server.query.BaseFuture.get(BaseFuture.java:29)
at com.avaje.ebeaninternal.server.query.LimitOffsetPage.getList(LimitOffsetPage.java:62)
... 29 more
Caused by: java.lang.NullPointerException
at com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocOne.getAssocOneIdValues(BeanPropertyAssocOne.java:411)
at com.avaje.ebeaninternal.server.expression.SimpleExpression.addBindValues(SimpleExpression.java:50)
at com.avaje.ebeaninternal.server.expression.LogicExpression.addBindValues(LogicExpression.java:56)
at com.avaje.ebeaninternal.util.DefaultExpressionList.buildBindValues(DefaultExpressionList.java:277)
at com.avaje.ebeaninternal.server.query.CQueryPredicates.prepare(CQueryPredicates.java:281)
at com.avaje.ebeaninternal.server.query.CQueryPredicates.prepare(CQueryPredicates.java:263)
at com.avaje.ebeaninternal.server.query.CQueryBuilder.buildQuery(CQueryBuilder.java:200)
at com.avaje.ebeaninternal.server.query.CQueryEngine.findMany(CQueryEngine.java:162)
at com.avaje.ebeaninternal.server.query.DefaultOrmQueryEngine.findMany(DefaultOrmQueryEngine.java:77)
at com.avaje.ebeaninternal.server.core.OrmQueryRequest.findList(OrmQueryRequest.java:272)
at com.avaje.ebeaninternal.server.core.DefaultServer.findList(DefaultServer.java:1502)
at com.avaje.ebeaninternal.server.query.CallableQueryList.call(CallableQueryList.java:26)
at com.avaje.ebeaninternal.server.query.CallableQueryList.call(CallableQueryList.java:15)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at com.avaje.ebeaninternal.server.lib.thread.PooledThread.doTheWork(PooledThread.java:89)
at com.avaje.ebeaninternal.server.lib.thread.PooledThread.run(PooledThread.java:62)
at java.lang.Thread.run(Thread.java:722)
package app.data;
import com.avaje.ebean.validation.Length;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
/**
* Created by aakture on 3/2/14.
*/
@Entity
@Table(name="o_user")
public class User {
@Id
Integer id;
@Length(max = 20)
String name;
@OneToMany(cascade = CascadeType.ALL)
List<ContactGroup> contactGroups = new ArrayList<ContactGroup>();
@OneToMany(cascade = CascadeType.ALL)
List<Contact> contacts = new ArrayList<Contact>();
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<ContactGroup> getContactGroups() {
return contactGroups;
}
public void setContactGroups(List<ContactGroup> contactGroups) {
this.contactGroups = contactGroups;
}
public List<Contact> getContacts() {
return contacts;
}
public void setContacts(List<Contact> contacts) {
this.contacts = contacts;
}
@Override
public String toString() {
return com.google.common.base.Objects.toStringHelper(this)
.add("id", id)
.add("name", name)
.add("contactGroups", contactGroups)
.toString();
}
}
package app.data;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
/**
* Created by aakture on 3/2/14.
*/
@Entity
@Table(name="o_contact")
public class Contact {
@Id
Integer id;
String name;
@ManyToOne
User user;
@ManyToMany
List<ContactGroup> contactGroups = new ArrayList<ContactGroup>();
public List<ContactGroup> getContactGroups() {
return contactGroups;
}
public void setContactGroups(List<ContactGroup> contactGroups) {
this.contactGroups = contactGroups;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
package app.data;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
/**
* Created by aakture on 3/2/14.
*/
@Entity
@Table(name="o_contact_group")
public class ContactGroup {
@Id
Integer id;
@ManyToOne
User user;
String name;
@ManyToMany(cascade = CascadeType.MERGE, mappedBy = "contactGroups")
List<Contact> contacts = new ArrayList<Contact>();
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<Contact> getContacts() {
return contacts;
}
public void setContacts(List<Contact> contacts) {
this.contacts = contacts;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public void test() {
User user = new User();
user.setName("UserBob");
Ebean.save(user);
ContactGroup contactGroup = new ContactGroup();
contactGroup.setName("Friends");
List<ContactGroup> contactGroupList = new ArrayList<ContactGroup>();
contactGroupList.add(contactGroup);
user.setContactGroups(contactGroupList);
Ebean.update(user);
user = Ebean.find(User.class).where().eq("name", "UserBob").findUnique();
List<ContactGroup> contactGroups = user.getContactGroups();
for(ContactGroup cg : contactGroups) {
System.out.println("contactGroup: " + cg.getName());
}
Contact contact = new Contact();
contact.setName("ContactSteve");
user.getContacts().add(contact);
Ebean.update(user);
user = Ebean.find(User.class).where().eq("name", "UserBob").findUnique();
for(Contact c : user.getContacts()) {
System.out.println("contact: " + c.getName());
}
Contact contactSteve = user.getContacts().get(0);
ContactGroup friends = user.getContactGroups().get(0);
friends.getContacts().add(contactSteve);
Ebean.saveManyToManyAssociations(friends, "contacts");
Ebean.update(user);
user = Ebean.find(User.class).where().eq("name", "UserBob").findUnique();
friends = user.getContactGroups().get(0);
List<Contact> contacts = friends.getContacts();
for (Contact c : contacts) {
System.out.println("contact: " + c.getName());
}
contact = Ebean.find(Contact.class).where().and(Expr.eq("user.name", "UserBob"), Expr.eq("contactGroups.name", "Friends")).findUnique();
System.out.println("contact: " + contact.getName());
}