【发布时间】：2014-01-21 06:05:45
【问题描述】：
我正在使用 PostgreSQL 9.1.1、Glassfish 4、EclipseLink 2 编写 Java ee7 Web 应用程序。 我的问题是，我无法访问数据库的某些表。 我有两个（实际上是 3 个）实体类，它们是我使用数据库中的 netbeans 自动生成的。
@Entity
@Table(name = "webappuser")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Webappuser.findAll", query = "SELECT w FROM Webappuser w"),
@NamedQuery(name = "Webappuser.findById", query = "SELECT w FROM Webappuser w WHERE w.id = :id"),
@NamedQuery(name = "Webappuser.findByUsername", query = "SELECT w FROM Webappuser w WHERE w.username = :username"),
@NamedQuery(name = "Webappuser.findByIsadmin", query = "SELECT w FROM Webappuser w WHERE w.isadmin = :isadmin"),
@NamedQuery(name = "Webappuser.findByPassword", query = "SELECT w FROM Webappuser w WHERE w.password = :password"),
@NamedQuery(name = "Webappuser.findBySalt", query = "SELECT w FROM Webappuser w WHERE w.salt = :salt")})
public class Webappuser implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id")
private Integer id;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 30)
@Column(name = "username")
private String username;
@Column(name = "isadmin")
private Boolean isadmin;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 64)
@Column(name = "password")
private String password;
@Size(max = 32)
@Column(name = "salt")
private String salt;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "user")
private Collection<Cardbox> cardboxCollection;
public Webappuser() {
}
public Webappuser(Integer id) {
this.id = id;
}
public Webappuser(Integer id, String username, String password) {
this.id = id;
this.username = username;
this.password = password;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Boolean getIsadmin() {
return isadmin;
}
public void setIsadmin(Boolean isadmin) {
this.isadmin = isadmin;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getSalt() {
return salt;
}
public void setSalt(String salt) {
this.salt = salt;
}
@XmlTransient
public Collection<Cardbox> getCardboxCollection() {
return cardboxCollection;
}
public void setCardboxCollection(Collection<Cardbox> cardboxCollection) {
this.cardboxCollection = cardboxCollection;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Webappuser)) {
return false;
}
Webappuser other = (Webappuser) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "entity.Webappuser[ id=" + id + " ]";
}
}
d
@Entity
@Table(name = "cardbox")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Cardbox.findAll", query = "SELECT c FROM Cardbox c"),
@NamedQuery(name = "Cardbox.findById", query = "SELECT c FROM Cardbox c WHERE c.id = :id"),
@NamedQuery(name = "Cardbox.findByCreated", query = "SELECT c FROM Cardbox c WHERE c.created = :created"),
@NamedQuery(name = "Cardbox.findByName", query = "SELECT c FROM Cardbox c WHERE c.name = :name"),
@NamedQuery(name = "Cardbox.findByUser", query = "SELECT c FROM Cardbox c WHERE c.user = :user")})
public class Cardbox implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "id")
private Integer id;
@Column(name = "created")
@Temporal(TemporalType.DATE)
private Date created;
@Size(max = 30)
@Column(name = "name")
private String name;
@JoinColumn(name = "user", referencedColumnName = "id")
@ManyToOne(optional = false)
private Webappuser user;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "cardbox")
private Collection<Card> cardCollection;
public Cardbox() {
}
public Cardbox(Integer id) {
this.id = id;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Webappuser getUser() {
return user;
}
public void setUser(Webappuser user) {
this.user = user;
}
@XmlTransient
public Collection<Card> getCardCollection() {
return cardCollection;
}
public void setCardCollection(Collection<Card> cardCollection) {
this.cardCollection = cardCollection;
}
@Override
public int hashCode() {
int hash = 0;
hash += (id != null ? id.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Cardbox)) {
return false;
}
Cardbox other = (Cardbox) object;
if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
return false;
}
return true;
}
@Override
public String toString() {
return "entity.Cardbox[ id=" + id + " ]";
}
}
我尝试使用 EJB 访问我的数据
import entity.Cardbox;
import entity.Webappuser;
import java.util.Collection;
import javax.ejb.Stateless;
import javax.inject.Named;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Named
@Stateless
public class Dao {
@PersistenceContext
EntityManager em;
public Collection<Cardbox> getAllCardboxes() {
return em.createNamedQuery("Cardbox.findAll").getResultList();
}
public Collection<Cardbox> getAllCardboxByUser() {
Webappuser user = em.createNamedQuery("Webappuser.findByUsername", Webappuser.class)
.setParameter("username", "haha")
.getSingleResult();
return em.createNamedQuery("Cardbox.findByUser", Cardbox.class)
.setParameter("user", user).getResultList();
}
//This works
public Webappuser getAllUser() {
return em.createNamedQuery("Webappuser.findByUsername", Webappuser.class)
.setParameter("username", "haha")
.getSingleResult();
}
}
通过 JSF 访问
<h:form>
<h:dataTable value="#{dao.allCardboxes}" var="cardbox">
<h:column>#{cardbox.name}</h:column>
</h:dataTable>
<h:dataTable value="#{dao.allCardboxByUser}" var="cardboxOfUser">
<h:column>#{cardboxOfUser.id}</h:column>
</h:dataTable>
<h:dataTable value="#{dao.allUser}" var="user">
<h:column>#{user.username}</h:column>
</h:dataTable>
</h:form>
我在使用“dao.allCardboxes”时遇到的错误（由于字符太多，不得不离开顶部）
javax.ejb.EJBException
at com.sun.ejb.containers.EJBContainerTransactionManager.processSystemException(EJBContainerTransactionManager.java:748)
at com.sun.ejb.containers.EJBContainerTransactionManager.completeNewTx(EJBContainerTransactionManager.java:698)
at com.sun.ejb.containers.EJBContainerTransactionManager.postInvokeTx(EJBContainerTransactionManager.java:503)
at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4475)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2009)
at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1979)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:220)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
at sun.proxy.$Proxy526.getAllCardboxes(Unknown Source)
at ejb.__EJB31_Generated__Dao__Intf____Bean__.getAllCardboxes(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:722)
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-3001] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [postgres], of class [class java.lang.String], could not be converted to [class java.lang.Integer].
Internal Exception: java.lang.NumberFormatException: For input string: "postgres"
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:479)
at ejb.Dao.getAllCardboxes(Dao.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4695)
at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:630)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:46)
at sun.reflect.GeneratedMethodAccessor114.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4667)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4655)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)
... 74 more
Caused by: Exception [EclipseLink-3001] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [postgres], of class [class java.lang.String], could not be converted to [class java.lang.Integer].
Internal Exception: java.lang.NumberFormatException: For input string: "postgres"
at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConverted(ConversionException.java:87)
at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToInteger(ConversionManager.java:542)
at org.eclipse.persistence.internal.helper.ConversionManager.convertObject(ConversionManager.java:116)
at org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform.convertObject(DatasourcePlatform.java:179)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.extractPrimaryKeyFromRow(ObjectBuilder.java:2805)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.extractPrimaryKeyFromExpression(ObjectBuilder.java:2651)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.checkCacheForObject(ExpressionQueryMechanism.java:869)
at org.eclipse.persistence.queries.ReadObjectQuery.checkEarlyReturnLocal(ReadObjectQuery.java:245)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.checkEarlyReturn(ObjectLevelReadQuery.java:833)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:836)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1114)
at org.eclipse.persistence.queries.ReadObjectQuery.execute(ReadObjectQuery.java:429)
at org.eclipse.persistence.internal.sessions.AbstractSession.internalExecuteQuery(AbstractSession.java:3207)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1797)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1779)
at org.eclipse.persistence.internal.indirection.NoIndirectionPolicy.valueFromQuery(NoIndirectionPolicy.java:326)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRowInternal(ForeignReferenceMapping.java:2234)
at org.eclipse.persistence.mappings.OneToOneMapping.valueFromRowInternal(OneToOneMapping.java:1790)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRow(ForeignReferenceMapping.java:2120)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.readFromRowIntoObject(ForeignReferenceMapping.java:1455)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:455)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:862)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneNormally(ObjectBuilder.java:777)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:730)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:629)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:587)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:571)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:782)
at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:848)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:490)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1155)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1114)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:402)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1202)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2894)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1797)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1779)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1744)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:258)
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:468)
... 103 more
Caused by: java.lang.NumberFormatException: For input string: "postgres"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.valueOf(Integer.java:582)
at org.eclipse.persistence.internal.helper.ConversionManager.convertObjectToInteger(ConversionManager.java:527)
... 142 more
我在使用 'dao.allCardboxByUser' 时遇到的错误
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: org.postgresql.util.PSQLException: FEHLER: Operator existiert nicht: name = integer
Hinweis: Kein Operator stimmt mit dem angegebenen Namen und den Argumenttypen überein. Sie müssen möglicherweise ausdrückliche Typumwandlungen hinzufügen.
Position: 57
Error Code: 0
Call: SELECT id, created, name, user FROM cardbox WHERE (user = ?)
bind => [1 parameter bound]
Query: ReadAllQuery(name="Cardbox.findByUser" referenceClass=Cardbox sql="SELECT id, created, name, user FROM cardbox WHERE (user = ?)")
at org.eclipse.persistence.internal.jpa.QueryImpl.getDetailedException(QueryImpl.java:377)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:46)
at sun.reflect.GeneratedMethodAccessor114.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
at sun.reflect.GeneratedMethodAccessor153.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4667)
at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4655)
at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)
... 74 more
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: org.postgresql.util.PSQLException: FEHLER: Operator existiert nicht: name = integer
Hinweis: Kein Operator stimmt mit dem angegebenen Namen und den Argumenttypen überein. Sie müssen möglicherweise ausdrückliche Typumwandlungen hinzufügen.
Position: 57
Error Code: 0
Call: SELECT id, created, name, user FROM cardbox WHERE (user = ?)
bind => [1 parameter bound]
Query: ReadAllQuery(name="Cardbox.findByUser" referenceClass=Cardbox sql="SELECT id, created, name, user FROM cardbox WHERE (user = ?)")
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:340)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:679)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:558)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:1995)
at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:570)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:242)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:299)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:694)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2714)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2667)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:477)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1155)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1114)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:402)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1202)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2894)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1797)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1779)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1744)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:258)
... 104 more
Caused by: org.postgresql.util.PSQLException: FEHLER: Operator existiert nicht: name = integer
Hinweis: Kein Operator stimmt mit dem angegebenen Namen und den Argumenttypen überein. Sie müssen möglicherweise ausdrückliche Typumwandlungen hinzufügen.
Position: 57
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:302)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeSelect(DatabaseAccessor.java:1002)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:641)
... 124 more
Persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="CardMKNPU" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>flashMKN</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="eclipselink.ddl-generation" value="create-tables"/>
<property name="eclipselink.ddl-generation.output-mode" value="database"/>
</properties>
</persistence-unit>
</persistence>
【问题讨论】：
-
你的连接设置怎么样？例如 persistence.xml 文件。看起来您将数据库名称“postgres”与 db-port 放错了位置！
-
我怎样才能查到这个？我让 netbeans 用 DB 做所有事情。
-
有趣的是，如果我让 netbeans 创建 JSF、EJB 和控制器，我可以列出所有卡箱吗？右键单击项目-> 从实体类创建 JSF。我的道课有问题吗？
-
meta-inf 文件夹中应该有一个名为 persistence.xml 的文件。如果没有，则在源文件夹中搜索文件，通常是保存项目的“src”。
-
现在怎么样？我的 persistence.xml 有问题吗？
标签： java postgresql jakarta-ee jpa jsf-2