Hibernate 休眠@manytone和@OneToMany以列表形式获取数据(记录数)
我有两张桌子Hibernate 休眠@manytone和@OneToMany以列表形式获取数据(记录数),hibernate,spring-mvc,hibernate-mapping,entity-relationship,hbmxml,Hibernate,Spring Mvc,Hibernate Mapping,Entity Relationship,Hbmxml,我有两张桌子 1.Org[Org\u ID,PARENT\u ID,LANG\u ID(参考LANG)] 2.语言[语言ID,语言名称] 我的JAVA实体文件 Lang.java @Entity @JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "langId") @JsonIgnoreProperties({ "hibernateLazyInitializer", "hand
1.Org[Org\u ID,PARENT\u ID,LANG\u ID(参考LANG)] 2.语言[语言ID,语言名称]
@Entity
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "langId")
@JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
@SuppressWarnings("serial")
public class Lang implements java.io.Serializable {
private BigDecimal langId;
private String langName;
private Set<Org> orgs = new HashSet<Org>(0);
public Lang() {
}
public Lang(BigDecimal langId, Set<Org> orgs) {
this.langId = langId;
this.orgs = orgs;
}
public BigDecimal getLangId() {
return this.langId;
}
public void setLangId(BigDecimal langId) {
this.langId = langId;
}
public String getLangName() {
return this.langName;
}
public void setLangName(String langName) {
this.langName = langName;
}public void setOrgs(Set<Org> orgs) {
this.orgs = orgs;
}
}
@Entity
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "orgId")
@JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
@SuppressWarnings("serial")
public class Org implements java.io.Serializable {
@Id
@Column(name = "orgId")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private BigDecimal orgId;
private BigDecimal parentOrgId;
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "langId",scope=Lang.class)
public Org() {
}
public Org(BigDecimal orgId, BigDecimal parentOrgId, Lang lang) {
this.orgId = orgId;
this.parentOrgId = parentOrgId;
this.lang = lang;
}
public BigDecimal getOrgId() {
return this.orgId;
}
public void setOrgId(BigDecimal orgId) {
this.orgId = orgId;
}
public BigDecimal getParentOrgId() {
return this.parentOrgId;
}
public void setParentOrgId(BigDecimal parentOrgId) {
this.parentOrgId = parentOrgId;
}
@ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
public Lang getLang() {
return this.lang;
}
public void setLang(Lang lang) {
this.lang = lang;
}
}
<hibernate-mapping package="com.test.entity">
<class name="com.test.entity.Org" table="ORG">
<id name="orgId" type="big_decimal">
<column name="ORG_ID" precision="22" scale="0" />
<generator class="increment" />
</id>
<property name="parentOrgId" type="big_decimal">
<column name="PARENT_ORG_ID" precision="22" scale="0" not-null="true" />
</property>
<many-to-one name="lang" class="com.test.entity.Lang" fetch="select">
<column name="LANG_ID" precision="22" scale="0" not-null="true" />
</many-to-one>
</class>
</hibernate-mapping>
<hibernate-mapping package="com.test.entity">
<class name="com.test.entity.Lang" table="LANG">
<id name="langId" type="big_decimal">
<column name="LANG_ID" precision="22" scale="0" />
<generator class="increment" />
</id>
<property name="langName" type="string">
<column name="LANG_NAME" length="32" not-null="true" unique="true" />
</property>
<set name="orgs" table="ORG" inverse="true" lazy="true" fetch="select">
<key>
<column name="LANG_ID" precision="22" scale="0" not-null="true" />
</key>
<one-to-many class="com.test.entity.Org" />
</set>
</class>
</hibernate-mapping>
这将让您开始,我正在使用Spring JPA2和Hibernate以及Jackson 我让Hibernate从实体创建表 Spring应用程序上下文如下所示:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:jpa="http://www.springframework.org/schema/data/jpa" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">
<context:component-scan base-package="com.greg" />
<tx:annotation-driven />
<jpa:repositories base-package="com.greg.repository" />
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.h2.Driver" />
<property name="url" value="jdbc:h2:mem:test;DB_CLOSE_DELAY=-1" />
<property name="username" value="sa" />
<property name="password" value="" />
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.greg.entity" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">create</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.format_sql">false</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.H2Dialect</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
</beans>
这将创建问题中的表格
Spring JPA存储库很简单:
@Repository
@Transactional
public interface OrgRepository extends CrudRepository<Org, Long> {
}
我的测试是:
@Test
@Transactional
public void test1() {
try {
Lang lang = makeLang("EN");
langRepository.save(lang);
assertNotNull(lang.getLangId());
Org org1 = new Org();
org1.setLang(lang);
orgRepository.save(org1);
Org org2 = new Org();
org2.setLang(lang);
org2.setParent(org1);
orgRepository.save(org2);
Org org3 = new Org();
org3.setLang(lang);
org3.setParent(org2);
orgRepository.save(org3);
assertEquals("EN", orgRepository.findOne(org1.getOrgId()).getLang().getLangName());
assertNull(orgRepository.findOne(org1.getOrgId()).getParent());
assertEquals("EN", orgRepository.findOne(org2.getOrgId()).getLang().getLangName());
assertEquals(org1.getOrgId().longValue(), orgRepository.findOne(org2.getOrgId()).getParent().getOrgId().longValue());
assertEquals("EN", orgRepository.findOne(org3.getOrgId()).getLang().getLangName());
assertEquals(org2.getOrgId().longValue(), orgRepository.findOne(org3.getOrgId()).getParent().getOrgId().longValue());
System.out.println(new ObjectMapper().writeValueAsString(org3));
showTables("ORG");
showTables("LANG");
} catch (Exception e) {
e.printStackTrace();
fail();
}
}
private Lang makeLang(String name) {
Lang lang = new Lang();
lang.setLangName(name);
return lang;
}
请提供控制器方法的代码
getAllChildWithParetOrgs(parentId)代码>。那会更有帮助。另外,根据我对hibernate查询连接和数据库快照的理解,我认为JSON输出不应该再登记记录。请查看以下解释:
因为您传递的parentId为0。根据hibernate查询联接和数据库快照,似乎没有OrgId=0的单独记录。
从子句的parentOrgId=0部分,它指的是子项:orgId为1的记录。
随后,它指的是orgId=1的子记录,即parentOrgId=1的记录,即orgId=2和orgId=3的记录。我不认为你的JSON对象应该在那之后获得更多的结果
@Entity
public class Org {
@Id
@Column(name = "org_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private Long orgId;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "lang_id", referencedColumnName = "lang_id", updatable = false, insertable = false, nullable = false)
private Lang lang;
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "parent_id", referencedColumnName = "org_id", updatable = false, insertable = false, nullable = false)
private Org parent;
@Repository
@Transactional
public interface OrgRepository extends CrudRepository<Org, Long> {
}
@Repository
@Transactional
public interface OrgRepository extends CrudRepository<Lang, Long> {
}
{
"orgId": 4,
"lang": {
"langId": 1,
"langName": "EN",
"orgs": null
},
"parent": {
"orgId": 3,
"lang": {
"langId": 1,
"langName": "EN",
"orgs": null
},
"parent": {
"orgId": 2,
"lang": {
"langId": 1,
"langName": "EN",
"orgs": null
},
"parent": null
}
}
}
@Test
@Transactional
public void test1() {
try {
Lang lang = makeLang("EN");
langRepository.save(lang);
assertNotNull(lang.getLangId());
Org org1 = new Org();
org1.setLang(lang);
orgRepository.save(org1);
Org org2 = new Org();
org2.setLang(lang);
org2.setParent(org1);
orgRepository.save(org2);
Org org3 = new Org();
org3.setLang(lang);
org3.setParent(org2);
orgRepository.save(org3);
assertEquals("EN", orgRepository.findOne(org1.getOrgId()).getLang().getLangName());
assertNull(orgRepository.findOne(org1.getOrgId()).getParent());
assertEquals("EN", orgRepository.findOne(org2.getOrgId()).getLang().getLangName());
assertEquals(org1.getOrgId().longValue(), orgRepository.findOne(org2.getOrgId()).getParent().getOrgId().longValue());
assertEquals("EN", orgRepository.findOne(org3.getOrgId()).getLang().getLangName());
assertEquals(org2.getOrgId().longValue(), orgRepository.findOne(org3.getOrgId()).getParent().getOrgId().longValue());
System.out.println(new ObjectMapper().writeValueAsString(org3));
showTables("ORG");
showTables("LANG");
} catch (Exception e) {
e.printStackTrace();
fail();
}
}
private Lang makeLang(String name) {
Lang lang = new Lang();
lang.setLangName(name);
return lang;
}