Java Spring数据JPA存储库匹配所有列或整个pojo
我试图搜索,但没有找到准确的答案。我有Java Spring数据JPA存储库匹配所有列或整个pojo,java,spring,spring-mvc,jpa,spring-data-jpa,Java,Spring,Spring Mvc,Jpa,Spring Data Jpa,我试图搜索,但没有找到准确的答案。我有地址实体。对于每个新的地址请求,首先我要检查数据库中是否存在相同的地址。我的申请是仓库&同样的地址请求可能会多次出现 地址实体 @Entity @NamedQuery(name="Address.findAll", query="SELECT a FROM Address a") public class Address implements Serializable { private static final long serialVersion
地址
实体。对于每个新的地址请求,首先我要检查数据库中是否存在相同的地址。我的申请是仓库&同样的地址请求可能会多次出现
地址实体
@Entity
@NamedQuery(name="Address.findAll", query="SELECT a FROM Address a")
public class Address implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Integer id;
private String firstname;
private String lastname;
private String address1;
private String address2;
private String address3;
private String city;
private String postcode;
@JsonProperty(value="county")
private String state;
private String country;
private String telephoneno;
private String mobileno;
private String email;
//bi-directional many-to-one association to Collection
@OneToMany(mappedBy="address")
@JsonIgnore
private List<Collection> collections;
//bi-directional many-to-one association to Delivery
@OneToMany(mappedBy="address")
@JsonIgnore
private List<Delivery> deliveries;
public Address() {
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getAddress1() {
return this.address1;
}
public void setAddress1(String address1) {
this.address1 = address1;
}
public String getAddress2() {
return this.address2;
}
public void setAddress2(String address2) {
this.address2 = address2;
}
public String getAddress3() {
return this.address3;
}
public void setAddress3(String address3) {
this.address3 = address3;
}
public String getCity() {
return this.city;
}
public void setCity(String city) {
this.city = city;
}
public String getCountry() {
return this.country;
}
public void setCountry(String country) {
this.country = country;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPostcode() {
return this.postcode;
}
public void setPostcode(String postcode) {
this.postcode = postcode;
}
public String getState() {
return this.state;
}
public void setState(String state) {
this.state = state;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
public String getTelephoneno() {
return telephoneno;
}
public void setTelephoneno(String telephoneno) {
this.telephoneno = telephoneno;
}
public String getMobileno() {
return mobileno;
}
public void setMobileno(String mobileno) {
this.mobileno = mobileno;
}
public List<Collection> getCollections() {
return this.collections;
}
public void setCollections(List<Collection> collections) {
this.collections = collections;
}
public Collection addCollection(Collection collection) {
getCollections().add(collection);
collection.setAddress(this);
return collection;
}
public Collection removeCollection(Collection collection) {
getCollections().remove(collection);
collection.setAddress(null);
return collection;
}
public List<Delivery> getDeliveries() {
return this.deliveries;
}
public void setDeliveries(List<Delivery> deliveries) {
this.deliveries = deliveries;
}
public Delivery addDelivery(Delivery delivery) {
getDeliveries().add(delivery);
delivery.setAddress(this);
return delivery;
}
public Delivery removeDelivery(Delivery delivery) {
getDeliveries().remove(delivery);
delivery.setAddress(null);
return delivery;
}
}
但我想知道是否有更好的方法来做到这一点。是否有任何东西可以用来传递新的地址
对象,以检查数据库中是否存在相同的地址
编辑
根据Manish的回答,我的理解如下:
1> 创建接口ExtendedJpaRepository
,如回答中所述
2> 为此接口创建实现类,如下所示(参考:)
公共类MyRepositoryImpl
扩展SimpleParepository实现MyRepository{
列表findByExample(T示例){
//QueryByExample的EclipseLink实现
}
}
3> 然后,对于每个存储库接口,扩展ExtendedJpaRepository
。这将使findByExample
在每个存储库中都可以随时使用
4> 如的步骤4所述,创建自定义存储库工厂以替换默认的RepositoryFactoryBean
5> 声明自定义工厂的bean。(的第5步)您要查找的内容被称为
示例查询
。如中所述,JPA2.0考虑了此功能,但未包含在最终版本中。这篇文章还解释了大多数JPA提供商都具有实现此功能所必需的功能
您可以创建定制的JPA存储库实现,以提供现成的功能。有关详情,请参阅
一个起点是创建一个新接口,例如:
public interface ExtendedJpaRepository<T, ID extends Serializable>
extends JpaRepository<T, ID> {
List<T> findByExample(T example);
}
公共接口扩展jparepository
扩展JPA假设{
列表findByExample(T示例);
}
然后,为这个接口插入一个使用底层JPA提供程序的实现。最后,将自定义实现配置为用于所有存储库接口
之后,您应该能够调用
addressRepository.findByExample(address)
,前提是addressRepository
ExtendedJpaRepository您可以使用Spring数据提供的现成规范。并且能够使用criteria API以编程方式构建查询。为了支持规范,您可以使用JpaSpecificationExecutor接口扩展存储库接口
public interface CustomerRepository extends SimpleJpaRepository<T, ID>, JpaSpecificationExecutor {
}
公共接口CustomerRepository扩展了SimpleParepository,JpaSpecificationExecutor{
}
附加接口(JpaSpecificationExecutor)包含允许您以多种方式执行规范的方法
例如,findAll方法将返回与规范匹配的所有实体:
List<T> findAll(Specification<T> spec);
清单findAll(规范规范);
规范界面如下:
public interface Specification<T> {
Predicate toPredicate(Root<T> root, CriteriaQuery<?> query,
CriteriaBuilder builder);
}
公共接口规范{
谓词toPredicate(根根、标准查询、,
标准生成器);
}
好的,那么典型的用例是什么?规范可以很容易地用于在实体之上构建一组可扩展的谓词,然后可以将这些谓词与JpaRepository组合使用,而无需为每个需要的组合声明查询(方法)。下面是一个例子:
例2.15。客户规格
public class CustomerSpecs {
public static Specification<Customer> isLongTermCustomer() {
return new Specification<Customer>() {
public Predicate toPredicate(Root<Customer> root, CriteriaQuery<?> query,
CriteriaBuilder builder) {
LocalDate date = new LocalDate().minusYears(2);
return builder.lessThan(root.get('dateField'), date);
}
};
}
public static Specification<Customer> hasSalesOfMoreThan(MontaryAmount value) {
return new Specification<Customer>() {
public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query,
CriteriaBuilder builder) {
// build query here
}
};
}
}
公共类客户规范{
公共静态规范isLongTermCustomer(){
返回新规范(){
公共谓词toPredicate(根根、标准查询、,
标准生成器(生成器){
LocalDate日期=新的LocalDate().minusYears(2);
返回builder.lessThan(root.get('dateField'),date);
}
};
}
公共静态规范hasSalesOfMoreThan(MontaryAmount值){
返回新规范(){
公共谓词toPredicate(根根、标准查询、,
标准生成器(生成器){
//在此处生成查询
}
};
}
}
您在业务需求抽象级别上表达了一些标准,并创建了可执行规范。因此,客户机可能会使用如下规范:
List customers=customerRepository.findAll(isLongTermCustomer())
您还可以结合规范
例2.17。组合规格
MonetaryAmount amount = new MonetaryAmount(200.0, Currencies.DOLLAR);
List<Customer> customers = customerRepository.findAll(
where(isLongTermCustomer()).or(hasSalesOfMoreThan(amount)));
MonetaryAmount amount=新的MonetaryAmount(200.0,货币.美元);
列出客户=customerRepository.findAll(
其中(isLongTermCustomer())或(HassalesOfMore(amount));
正如您所看到的,规范提供了一些用于链接的粘合代码方法
和组合规格。因此,扩展数据访问层是非常必要的
只是创建新规范和实现的问题
将它们与现有的结合起来
您可以创建复杂的规范,下面是一个示例
public class WorkInProgressSpecification {
public static Specification<WorkInProgress> findByCriteria(final SearchCriteria searchCriteria){
return new Specification<WorkInProgress>() {
@Override
public Predicate toPredicate(Root<WorkInProgress> root,
CriteriaQuery<?> query, CriteriaBuilder cb) {
List<Predicate> predicates = new ArrayList<Predicate>();
if(searchCriteria.getView()!=null && !searchCriteria.getView().isEmpty()){
predicates.add(cb.equal(root.get("viewType"), searchCriteria.getView()));
}if(searchCriteria.getFeature()!=null && !searchCriteria.getFeature().isEmpty()){
predicates.add(cb.equal(root.get("title"), searchCriteria.getFeature()));
}if(searchCriteria.getEpic()!=null && !searchCriteria.getEpic().isEmpty()){
predicates.add(cb.equal(root.get("epic"), searchCriteria.getEpic()));
}if( searchCriteria.getPerformingGroup()!=null && !searchCriteria.getPerformingGroup().isEmpty()){
predicates.add(cb.equal(root.get("performingGroup"), searchCriteria.getPerformingGroup()));
}if(searchCriteria.getPlannedStartDate()!=null){
System.out.println("searchCriteria.getPlannedStartDate():" + searchCriteria.getPlannedStartDate());
predicates.add(cb.greaterThanOrEqualTo(root.<Date>get("plndStartDate"), searchCriteria.getPlannedStartDate()));
}if(searchCriteria.getPlannedCompletionDate()!=null){
predicates.add(cb.lessThanOrEqualTo(root.<Date>get("plndComplDate"), searchCriteria.getPlannedCompletionDate()));
}if(searchCriteria.getTeam()!=null && !searchCriteria.getTeam().isEmpty()){
predicates.add(cb.equal(root.get("agileTeam"), searchCriteria.getTeam()));
}
return cb.and(predicates.toArray(new Predicate[]{}));
}
};
}
}
公共类工作进程规范{
公共静态规范findByCriteria(最终搜索条件SearchCriteria){
返回新规范(){
@凌驾
公共谓词toPredicate(根,
CriteriaQuery查询,CriteriaBuilder(cb){
列表谓词=新的ArrayList();
if(searchCriteria.getView()!=null&!searchCriteria.getView().isEmpty()){
add(cb.equal(root.get(“viewType”)、searchCriteria.getView());
}if(searchCriteria.getFeature()!=null&!searchCriteria.getFeature().isEmpty()){
add(cb.equal(root.get(“title”)、searchCriteria.getFeature());
}if(searchCriteria.getEpic()!=null&!searchCriteria.getEpic().isEmpty()){
add(cb.equal(root.get(“epic”)、searchCriteria.getEpic());
}if(searchCriteria.getPerformingGroup()!=nu
MonetaryAmount amount = new MonetaryAmount(200.0, Currencies.DOLLAR);
List<Customer> customers = customerRepository.findAll(
where(isLongTermCustomer()).or(hasSalesOfMoreThan(amount)));
public class WorkInProgressSpecification {
public static Specification<WorkInProgress> findByCriteria(final SearchCriteria searchCriteria){
return new Specification<WorkInProgress>() {
@Override
public Predicate toPredicate(Root<WorkInProgress> root,
CriteriaQuery<?> query, CriteriaBuilder cb) {
List<Predicate> predicates = new ArrayList<Predicate>();
if(searchCriteria.getView()!=null && !searchCriteria.getView().isEmpty()){
predicates.add(cb.equal(root.get("viewType"), searchCriteria.getView()));
}if(searchCriteria.getFeature()!=null && !searchCriteria.getFeature().isEmpty()){
predicates.add(cb.equal(root.get("title"), searchCriteria.getFeature()));
}if(searchCriteria.getEpic()!=null && !searchCriteria.getEpic().isEmpty()){
predicates.add(cb.equal(root.get("epic"), searchCriteria.getEpic()));
}if( searchCriteria.getPerformingGroup()!=null && !searchCriteria.getPerformingGroup().isEmpty()){
predicates.add(cb.equal(root.get("performingGroup"), searchCriteria.getPerformingGroup()));
}if(searchCriteria.getPlannedStartDate()!=null){
System.out.println("searchCriteria.getPlannedStartDate():" + searchCriteria.getPlannedStartDate());
predicates.add(cb.greaterThanOrEqualTo(root.<Date>get("plndStartDate"), searchCriteria.getPlannedStartDate()));
}if(searchCriteria.getPlannedCompletionDate()!=null){
predicates.add(cb.lessThanOrEqualTo(root.<Date>get("plndComplDate"), searchCriteria.getPlannedCompletionDate()));
}if(searchCriteria.getTeam()!=null && !searchCriteria.getTeam().isEmpty()){
predicates.add(cb.equal(root.get("agileTeam"), searchCriteria.getTeam()));
}
return cb.and(predicates.toArray(new Predicate[]{}));
}
};
}
}