Mysql 使用联接表的Jpa一对多
我有一个房间实体、一个规则实体和一个便利设施实体。我想做的是事先手动填写规则和便利设施实体,当我插入房间时,我想根据用户选择的规则和便利设施来映射两个连接表中的两个,房间规则和房间便利设施 我该如何做到这一点?当我保留一个新的房间实体时,它是否应该已经包含规则和设施?如果这些元素的集合没有映射为cascade.persist,它会起作用吗 或者我应该先保留没有它们的房间,然后将它们映射到房间 我该怎么办 更新 我的房间实体:Mysql 使用联接表的Jpa一对多,mysql,jpa,intellij-idea,one-to-many,jointable,Mysql,Jpa,Intellij Idea,One To Many,Jointable,我有一个房间实体、一个规则实体和一个便利设施实体。我想做的是事先手动填写规则和便利设施实体,当我插入房间时,我想根据用户选择的规则和便利设施来映射两个连接表中的两个,房间规则和房间便利设施 我该如何做到这一点?当我保留一个新的房间实体时,它是否应该已经包含规则和设施?如果这些元素的集合没有映射为cascade.persist,它会起作用吗 或者我应该先保留没有它们的房间,然后将它们映射到房间 我该怎么办 更新 我的房间实体: public class RoomEntity {
public class RoomEntity {
@Id
@GeneratedValue(strategy= GenerationType.SEQUENCE)
@Column(name = "id", nullable =false, unique = true)
private Integer id;
@Basic
@Column(name = "title", nullable = false, length = 45)
private String title;
@Basic
@Column(name = "description", nullable = false, length = 300)
private String description;
@Basic
@Column(name = "square_meters", nullable = false)
private Integer square_meters;
@Basic
@Column(name = "overnight_price", nullable = false)
private double overnight_price;
@Basic
@Column(name = "exta_person_price", nullable = false)
private double exta_person_price;
@Basic
@Column(name = "max_people", nullable = false)
private Integer max_people;
@Basic
@Column(name = "min_overnights", nullable = false)
private Integer min_overnights;
@Basic
@Column(name = "beds", nullable = false)
private Integer beds;
@Basic
@Column(name = "bathrooms", nullable = false)
private Integer bathrooms;
@Basic
@Column(name = "bedrooms", nullable = false)
private Integer bedrooms;
@Basic
@Column(name = "transport", length = 300)
private String transport;
@Basic
@Column(name = "neightborhood", length = 300)
private String neightborhood;
@Basic
@Column(name = "house_rules", length = 200)
private String house_rules;
@ManyToOne(cascade = CascadeType.MERGE)
@JoinColumn(name = "room_host", referencedColumnName = "username", /*nullable = false,*/ insertable = false, updatable = false)
private HostEntity hostEntity;
public HostEntity getHostEntity() {
return hostEntity;
}
public void setHostEntity(HostEntity hostEntity) {
this.hostEntity = hostEntity;
}
@OneToOne
@JoinColumn(name = "room_type_id", referencedColumnName = "id", /*nullable = false,*/ insertable = false, updatable = false)
private TypeEntity typeEntity;
public TypeEntity getTypeEntity() {
return typeEntity;
}
public void setTypeEntity(TypeEntity typeEntity) {
this.typeEntity = typeEntity;
}
@OneToOne(cascade={CascadeType.ALL})
@JoinColumn(name = "room_location", referencedColumnName = "id"/*, nullable = false, insertable = false, updatable = false*/)
private LocationEntity locationEntity;
public LocationEntity getLocationEntity() {
return locationEntity;
}
public void setLocationEntity(LocationEntity locationEntity) {
this.locationEntity = locationEntity;
}
@OneToMany(cascade = {CascadeType.ALL})
@JoinTable(
/*name = "room_pictures",*/
joinColumns = {@JoinColumn(name = "room_id", referencedColumnName = "id")},
inverseJoinColumns = {@JoinColumn (name ="picture_id", referencedColumnName = "id", unique = true)}
)
private Collection<PictureEntity> pictureEntities = new ArrayList<>();
public Collection<PictureEntity> getPictureEntities() {
return pictureEntities;
}
public void setPictureEntities(Collection<PictureEntity> pictureEntities) {
this.pictureEntities = pictureEntities;
}
@OneToMany
@JoinTable(
/*name = "room_amenities",*/
joinColumns = {@JoinColumn(name = "room_id", referencedColumnName = "id")},
inverseJoinColumns = {@JoinColumn (name ="amenity_id", referencedColumnName = "id")}
)
private Collection<AmenitiesEntity> amenitiesEntities = new ArrayList<>();
public Collection<AmenitiesEntity> getAmenitiesEntities() {
return amenitiesEntities;
}
public void setAmenitiesEntities(Collection<AmenitiesEntity> amenitiesEntities) {
this.amenitiesEntities = amenitiesEntities;
}
@OneToMany
@JoinTable(
/*name = "room_amenities",*/
joinColumns = {@JoinColumn(name = "room_id", referencedColumnName = "id")},
inverseJoinColumns = {@JoinColumn (name ="rule_id", referencedColumnName = "id")}
)
private Collection<RuleEntity> ruleEntities = new ArrayList<>();
public Collection<RuleEntity> getRuleEntities() {
return ruleEntities;
}
public void setRuleEntities(Collection<RuleEntity> ruleEntities) {
this.ruleEntities = ruleEntities;
}
public Collection<Picture> toPicturesModel(){
Collection<Picture> pictures = new ArrayList<>();
for(PictureEntity o : this.pictureEntities){
pictures.add(o.toModel());
}
return pictures;
}
public Collection<Amenities> toAmenitiesModel(){
Collection<Amenities> amenities = new ArrayList<>();
for(AmenitiesEntity o : this.amenitiesEntities){
amenities.add(o.toModel());
}
return amenities;
}
public Collection<Rule> toRulesModel(){
Collection<Rule> rules = new ArrayList<>();
for(RuleEntity o : this.ruleEntities){
rules.add(o.toModel());
}
return rules;
}
public Room toModel(Integer depth){
System.out.println("RoomEntity:::toModel()");
return new Room(
this.hostEntity == null? null : this.hostEntity.toModel(depth),
this.getTypeEntity() == null? null : this.typeEntity.toModel(),
this.getLocationEntity()== null? null : this.locationEntity.toModel(),
this.getPictureEntities() == null ? null : this.toPicturesModel(),
this.getAmenitiesEntities() == null? null : this.toAmenitiesModel(),
this.getRuleEntities() == null? null : this.toRulesModel(),
this.title, this.description, this.square_meters,
this.overnight_price, this.exta_person_price,
this.max_people, this.min_overnights, this.beds, this.bathrooms,
this.bedrooms, this.transport, this.neightborhood, this.house_rules);
}
}
我的类型实体:
public class TypeEntity {
@Id
@Column(name = "id", nullable = false, unique = true)
private Integer id;
@Basic
@Column(name = "type_name", nullable = false, length = 45)
private String type;
@OneToOne(mappedBy = "typeEntity")
private RoomEntity roomEntity;
}
我的规则实体:
public class RuleEntity {
@Id
@Column(name = "id", nullable =false, unique = true)
//@GeneratedValue(strategy= GenerationType.SEQUENCE)
private Integer id;
@Basic
@Column(name = "rule", nullable =false , unique = true, length = 50)
private String rule;
}
我的形象:
public class PictureEntity {
@Id
@Column(name = "id", nullable =false, unique = true)
@GeneratedValue(strategy= GenerationType.SEQUENCE)
private Integer picture_id;
@Basic
@Column(name = "thumbnail_url", nullable =false, length = 100)
private String thumbnail_url;
@Basic
@Column(name = "medium_url", nullable =false, length = 100)
private String medium_url;
@Basic
@Column(name = "picture_url", nullable =false, length = 100)
private String picture_url;
@Basic
@Column(name = "xl_picture_url", nullable =false, length = 100)
private String xl_picture_url;
}
我的礼仪:
public class AmenitiesEntity {
@Id
@Column(name = "id", nullable =false, unique = true)
//@GeneratedValue(strategy= GenerationType.SEQUENCE)
private Integer id;
@Basic
@Column(name = "name", nullable = false, unique = true, length = 50)
private String amenity;
}
我创建房间的代码如下:
public Room addRoom(RoomInput room) {
dao.setParam("username", room.getOwner());
List<HostEntity> owner = dao.getTuples("users.findByUsername");
RoomEntity newRoom = new RoomEntity(room.getTitle(), room.getDescription(), room.getSquare_meters(), room.getOvernight_price(),
room.getExta_person_price(), room.getMax_people(), room.getMin_overnights(), room.getBeds(), room.getBathrooms(),
room.getBedrooms(), room.getTransport(), room.getNeightborhood(), room.getHouse_rules());
newRoom.setLocationEntity(room.getLocation().toEntity());
for(Picture o :room.getPictures()){
newRoom.getPictureEntities().add(o.toEntity());
}
RoomEntity entity = dao.insertTuple(newRoom);
entity.setHostEntity(owner.get(0));
for(Amenities o : room.getAmenities()){
entity.getAmenitiesEntities().add(o.toEntity());
}
for(Rule o : room.getRules()){
entity.getRuleEntities().add(o.toEntity());
}
entity.setTypeEntity(room.getType().toEntity());
entity = dao.updateTuple(entity);
System.out.println(entity.toString());
return (entity == null) ? null : entity.toModel(0);
}
公共房间添加室(房间输入室){
setParam(“username”,room.getOwner());
List owner=dao.getTuples(“users.findByUsername”);
RoomEntity newRoom=新RoomEntity(room.getTitle()、room.getDescription()、room.getSquare\u meters()、room.getNighter\u price(),
room.getExta\u person\u price(),room.getMax\u people(),room.getMin\u overnights(),room.getBeds(),room.getBathrooms(),room,
room.getBedrooms(),room.getTransport(),room.getNeightborhood(),room.getHouse_rules();
newRoom.setLocationEntity(room.getLocation().toEntity());
for(图片o:room.getPictures()){
newRoom.getPictureEntities().add(o.toEntity());
}
RoomEntity=dao.insertTuple(newRoom);
entity.setHostEntity(owner.get(0));
对于(便利设施o:room.getprofessionals()){
entity.getAmenitiesEntities().add(o.toEntity());
}
for(规则o:room.getRules()){
entity.getRuleEntities().add(o.toEntity());
}
entity.setTypeEntity(room.getType().toEntity());
entity=dao.updateTuple(entity);
System.out.println(entity.toString());
返回(entity==null)?null:entity.toModel(0);
}
现在发生的是,即使我的3个联接表,
房间图片、房间规则、房间设施得到正确更新,
我放在数据库中的房间有主机的外键(用户名)
并且类型(id)为null
有没有更好的方法来做这一切?现在我要去新房间,
保存图片和位置,然后我将房间与更新的主机、设施和规则的新值合并。更新
我解决了这个问题。现在,我为我希望与文件室(也称为位置和图片)保持一致的实体执行一次插入操作,并合并一次,以连接联接表中已删除的实体/规则,以及文件室表中的主机/键入外键。主机和类型的问题是@JoinColumn中的updateable和insertable为false,这是错误的。在我删除了那些声明之后,它起了作用!最后,我保存/合并已删除的实体和新实体的代码如下:
public Room addRoom(RoomInput room) {
dao.setParam("username", room.getOwner());
HostEntity host = null;
List<HostEntity> owner = dao.getTuples("users.findByUsername");
RoomEntity newRoom = new RoomEntity(room.getTitle(), room.getDescription(), room.getSquare_meters(), room.getOvernight_price(),
room.getExta_person_price(), room.getMax_people(), room.getMin_overnights(), room.getBeds(), room.getBathrooms(),
room.getBedrooms(), room.getTransport(), room.getNeightborhood(), room.getHouse_rules());
System.out.println(owner.get(0).toString());
newRoom.setLocationEntity(room.getLocation().toEntity());
for(Picture o :room.getPictures()){
newRoom.getPictureEntities().add(o.toEntity());
}
RoomEntity entity = dao.insertTuple(newRoom);
for(Amenities o : room.getAmenities()){
entity.getAmenitiesEntities().add(o.toEntity());
}
for(Rule o : room.getRules()){
entity.getRuleEntities().add(o.toEntity());
}
entity.setHostEntity(owner.get(0));
entity.setTypeEntity(room.getType().toEntity());
dao.updateTuple(entity);
System.out.println(entity.toString());
return (entity == null) ? null : entity.toModel(0);
}
公共房间添加室(房间输入室){
setParam(“username”,room.getOwner());
HostEntityHost=null;
List owner=dao.getTuples(“users.findByUsername”);
RoomEntity newRoom=新RoomEntity(room.getTitle()、room.getDescription()、room.getSquare\u meters()、room.getNighter\u price(),
room.getExta\u person\u price(),room.getMax\u people(),room.getMin\u overnights(),room.getBeds(),room.getBathrooms(),room,
room.getBedrooms(),room.getTransport(),room.getNeightborhood(),room.getHouse_rules();
System.out.println(owner.get(0.toString());
newRoom.setLocationEntity(room.getLocation().toEntity());
for(图片o:room.getPictures()){
newRoom.getPictureEntities().add(o.toEntity());
}
RoomEntity=dao.insertTuple(newRoom);
对于(便利设施o:room.getprofessionals()){
entity.getAmenitiesEntities().add(o.toEntity());
}
for(规则o:room.getRules()){
entity.getRuleEntities().add(o.toEntity());
}
entity.setHostEntity(owner.get(0));
entity.setTypeEntity(room.getType().toEntity());
updateTuple(实体);
System.out.println(entity.toString());
返回(entity==null)?null:entity.toModel(0);
}
请发布您的实体类。@AbdullahKhan完成!
public Room addRoom(RoomInput room) {
dao.setParam("username", room.getOwner());
List<HostEntity> owner = dao.getTuples("users.findByUsername");
RoomEntity newRoom = new RoomEntity(room.getTitle(), room.getDescription(), room.getSquare_meters(), room.getOvernight_price(),
room.getExta_person_price(), room.getMax_people(), room.getMin_overnights(), room.getBeds(), room.getBathrooms(),
room.getBedrooms(), room.getTransport(), room.getNeightborhood(), room.getHouse_rules());
newRoom.setLocationEntity(room.getLocation().toEntity());
for(Picture o :room.getPictures()){
newRoom.getPictureEntities().add(o.toEntity());
}
RoomEntity entity = dao.insertTuple(newRoom);
entity.setHostEntity(owner.get(0));
for(Amenities o : room.getAmenities()){
entity.getAmenitiesEntities().add(o.toEntity());
}
for(Rule o : room.getRules()){
entity.getRuleEntities().add(o.toEntity());
}
entity.setTypeEntity(room.getType().toEntity());
entity = dao.updateTuple(entity);
System.out.println(entity.toString());
return (entity == null) ? null : entity.toModel(0);
}
public Room addRoom(RoomInput room) {
dao.setParam("username", room.getOwner());
HostEntity host = null;
List<HostEntity> owner = dao.getTuples("users.findByUsername");
RoomEntity newRoom = new RoomEntity(room.getTitle(), room.getDescription(), room.getSquare_meters(), room.getOvernight_price(),
room.getExta_person_price(), room.getMax_people(), room.getMin_overnights(), room.getBeds(), room.getBathrooms(),
room.getBedrooms(), room.getTransport(), room.getNeightborhood(), room.getHouse_rules());
System.out.println(owner.get(0).toString());
newRoom.setLocationEntity(room.getLocation().toEntity());
for(Picture o :room.getPictures()){
newRoom.getPictureEntities().add(o.toEntity());
}
RoomEntity entity = dao.insertTuple(newRoom);
for(Amenities o : room.getAmenities()){
entity.getAmenitiesEntities().add(o.toEntity());
}
for(Rule o : room.getRules()){
entity.getRuleEntities().add(o.toEntity());
}
entity.setHostEntity(owner.get(0));
entity.setTypeEntity(room.getType().toEntity());
dao.updateTuple(entity);
System.out.println(entity.toString());
return (entity == null) ? null : entity.toModel(0);
}