我有两个具有双向onetomany和多个关系的hibernate实体，
@Entity
@Table(name = "Company")
@JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class, property="@id")
public class Company {
private int companyid;
private List<Employee> employees;
@Id
@Column(name = "companyid")
@GeneratedValue(strategy = GenerationType.AUTO)
public int getCompanyid() {
return companyid;
}
public void setCompanyid(int cid) {
companyid = cid;
}
@OneToMany(mappedBy = "company", cascade = CascadeType.ALL)
public List<Employee> getEmployees() {
return employees;
}
public void getEmployees(List<DiscountEntity> discountEntityList) {
this.employees = discountEntityList;
}
}
员工实体有此
@Entity
@Table(name = "EMPLOYEE")
public class DiscountEntity {
private int employeeid
@Id
@Column(name = "EMPLOYEEID")
@GeneratedValue(strategy = GenerationType.AUTO)
public int getEmployeeid() {
return employeeid;
}
public void setEmployeeid(int employeeid) {
this.employeeid = employeeid;
}
@ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
@JoinColumn(columnDefinition = "companyid", referencedColumnName = "companyid")
public Company getCompany() {
return company;
}
public void setCompany(Company discountAgreement) {
this.company = discountAgreement;
}
}
问题是当我调用company.getEmployee（）时，我得到以下错误
org.hibernate.exception.SQLGrammarException: could not initialize a collection: [Company.employees#1]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:90)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.loader.Loader.loadCollection(Loader.java:2026)
at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:59)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:587)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1744)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:366)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)
at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:131)
at org.hibernate.collection.PersistentBag.size(PersistentBag.java:248)
at se.softronic.appialec.module.agentprovision.AgentProvisionTest.testPrepare(AgentProvisionTest.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.sql.SQLException: [SQL0205] Column COMPANY_COMPANYID not in table EMPLOYEE
at com.ibm.as400.access.JDError.throwSQLException(JDError.java:650)
at com.ibm.as400.access.JDError.throwSQLException(JDError.java:621)
at com.ibm.as400.access.AS400JDBCStatement.commonPrepare(AS400JDBCStatement.java:1576)
at com.ibm.as400.access.AS400JDBCPreparedStatement.<init>(AS400JDBCPreparedStatement.java:193)
at com.ibm.as400.access.AS400JDBCConnection.prepareStatement(AS400JDBCConnection.java:2023)
at com.ibm.as400.access.AS400JDBCConnection.prepareStatement(AS400JDBCConnection.java:1822)
at com.mchange.v2.c3p0.impl.NewProxyConnection.prepareStatement(NewProxyConnection.java:213)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at org.springframework.jdbc.datasource.TransactionAwareDataSourceProxy$TransactionAwareInvocationHandler.invoke(TransactionAwareDataSourceProxy.java:239)
at com.sun.proxy.$Proxy16.prepareStatement(Unknown Source)
at se.softronic.util.sql.DelegatingConnection.prepareStatement(DelegatingConnection.java:212)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:534)
at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:452)
at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:161)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1577)
at org.hibernate.loader.Loader.doQuery(Loader.java:696)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.loadCollection(Loader.java:2019)
... 40 more
似乎hibernate尝试在列COMPANYID之前添加COMPANY，然后抱怨它不存在，我正确设置了表，它只是不起作用。
答案 0 :(得分：0)
应该是......
@Entity
@Table(name = "Company")
@JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class, property="@id")
public class Company {
private int companyid;
private List<Employee> employees;
@Id
@Column(name = "companyid")
@GeneratedValue(strategy = GenerationType.AUTO)
public int getCompanyid() {
return companyid;
}
public void setCompanyid(int cid) {
companyid = cid;
}
@OneToMany(mappedBy = "company", cascade = CascadeType.ALL)
public List<Employee> getEmployees() {
return employees;
}
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}
}