org.hibernate.hql.internal.ast.QuerySyntaxException:表未映射

Question

我有示例Web应用程序Hibernate 4.3.5 + Derby数据库10.10.1.1+ Glassfish4.0与IDE NetBeans 8.0Beta.

我有下一个例外:

Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: CUSTOMERV is not mapped
at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:189)
at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:109)
at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:95)
at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:331)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3633)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3522)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:706)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:562)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:299)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:247)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:278)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:206)
... 72 more 

来自index.xhtml的表单

<h:panelGrid id="panel1" columns="2" border="1"
                 cellpadding="5" cellspacing="1">
        <f:facet name="header">
            <h:outputText value="Add Customer Information"/>
        </f:facet>
        <h:outputLabel value="First Name:"/>
        <h:inputText value="#{customer.firstName}" id="fn"/>
        <h:outputLabel value="Last Name:"/>
        <h:inputText value="#{customer.lastName}" id="ln"/>
        <h:outputLabel value="Email:"/>
        <h:inputText value="#{customer.email}" id="eml"/>
        <h:outputLabel value="Date of Birth:"/>
        <h:inputText value="#{customer.sd}" id="s"/>
        <f:facet name="footer">
            <h:outputLabel value="#{customer.msg}" id="msg" styleClass="msg"/>
            <h:commandButton value="Save" action="#{customer.saveCustomer}">
            </h:commandButton>
        </f:facet>
    </h:panelGrid> 

Customer.java

    package com.javaknowledge.entity;

    import com.javaknowledge.dao.CustomerDao;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    import javax.faces.bean.ManagedBean;
    import javax.faces.bean.SessionScoped;
    import javax.persistence.*;    

    @ManagedBean
    @SessionScoped

    public class Customer implements java.io.Serializable {

    private Integer custId;
    private String firstName;
    private String lastName;
    private String email;
    private Date dob;
    private String sd, msg, selectedname;
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");


    public Customer() {
    }

    public Customer(String firstName, String lastName, String email, Date dob) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
        this.dob = dob;
    }

    public String getSd() {
        return sd;
    }

    public void setSd(String sd) {
        this.sd = sd;
    }

    public Integer getCustId() {
        return this.custId;
    }

    public void setCustId(Integer custId) {
        this.custId = custId;
    }

    public String getFirstName() {
        return this.firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return this.lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    @Column(name = "EMAIL")
    public String getEmail() {
        return this.email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Column(name = "DOB")
    public Date getDob() {
        return this.dob;
    }

    public void setDob(Date dob) {
        this.dob = dob;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public String getSelectedname() {
        return selectedname;
    }

    public void setSelectedname(String selectedname) {
        this.selectedname = selectedname;
    }

    public void saveCustomer() {
        try {
            Date d = sdf.parse(sd);
            System.out.println(d);
            this.dob = d;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        CustomerDao dao = new CustomerDao();
        dao.addCustomer(this);
        this.msg = "Member Info Saved Successfull!";
        clearAll();
    }
    public void updateCustomer() {
        try {
            Date d = sdf.parse(sd);
            System.out.println(d);
            this.dob = d;
        } catch (ParseException e) {
            e.printStackTrace();
        }
        CustomerDao dao = new CustomerDao();
        dao.updateCustomer(this);
        this.msg = "Member Info Update Successfull!";
        clearAll();
    }
    public void deleteCustomer() {
        CustomerDao dao = new CustomerDao();
        dao.deleteCustomer(custId);
        this.msg = "Member Info Delete Successfull!";
        clearAll();
    }

    public List<Customer> getAllCustomers() {
        List<Customer> users = new ArrayList<Customer>();
        CustomerDao dao = new CustomerDao();
        users = dao.getAllCustomers();
        return users;
    }

    public void fullInfo() {
        CustomerDao dao = new CustomerDao();
        List<Customer> lc = dao.getCustomerById(selectedname);
        System.out.println(lc.get(0).firstName);
        this.custId = lc.get(0).custId;
        this.firstName = lc.get(0).firstName;
        this.lastName = lc.get(0).lastName;
        this.email = lc.get(0).email;
        this.dob = lc.get(0).dob;
        this.sd = sdf.format(dob);
    }

    private void clearAll() {
        this.firstName = "";
        this.lastName = "";
        this.sd = "";
        this.email = "";
        this.custId=0;
    }

   }

的hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.DerbyDialect</property>
    <property name="hibernate.connection.driver_class">org.apache.derby.jdbc.ClientDriver</property>
    <property name="hibernate.connection.url">jdbc:derby://localhost:1527/derbyDB</property>
    <property name="hibernate.connection.username">user1</property>
    <property name="hibernate.connection.password">user1</property>
    <property name="hibernate.hbm2ddl.auto">create</property>

    <property name="c3p0.min_size">1</property>
    <property name="c3p0.max_size">5</property>
    <property name="c3p0.timeout">300</property>
    <property name="c3p0.max_statements">50</property>
    <property name="c3p0.idle_test_period">300</property>

    <mapping class="com.javaknowledge.entity.Customer" resource="com/javaknowledge/entity/Customer.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

Customer.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
  <class name="com.javaknowledge.entity.Customer" table="CUSTOMERV" schema="APP">
        <id name="custId" type="java.lang.Integer">
            <column name="cust_id" />
            <generator class="increment" />
        </id>
        <property name="firstName" type="string">
            <column name="first_name" length="45" not-null="true" />
        </property>
        <property name="lastName" type="string">
            <column name="last_name" length="45" not-null="true" />
        </property>
        <property name="email" type="string">
            <column name="email" length="45" not-null="true" />
        </property>
        <property name="dob" type="date">
            <column name="dob" length="10" not-null="true" />
        </property>
   </class>
</hibernate-mapping>

Answer 1

最后我发现了一个错误!希望这对某人有用.在向数据库发出请求时(在我的情况下是Apache Derby),base的名称需要以小写形式写出第一个大写的大写字母.

这是错误的查询:

session.createQuery("select first_name from CUSTOMERV").

这是有效的查询

session.createQuery("select first_name from Customerv"). 

类实体必须与数据库同名,但我不确定.

Answer 2

就我而言，我只是忘了添加 nativeQuery = true

@Query( value = "some sql query ...", nativeQuery = true)

对于带有 Spring Data JPA 的 Spring Boot

Answer 3

在HQL查询中，不要写表名，在查询中 写您的Entity类名

String s = "from Entity_class name";
query qry = session.createUqery(s);

Answer 4

hibernate.cfg.xml文件应该具有如下表格的映射.检查文件中是否缺少.

......
<hibernate-configuration>
......
......
  <session-factory>
......
<mapping class="com.test.bean.dbBean.testTableHibernate"/>
......
 </session-factory>

</hibernate-configuration>
.....

Answer 5

其他解决方案都不适合我。

即使我认为这不是最佳实践，我也必须像这样将其添加到代码中

configuration.addAnnotatedClass(com.myOrg.entities.Person.class);

这里

public static SessionFactory getSessionFactory() {
    Configuration configuration = new Configuration().configure();

    configuration.addAnnotatedClass(com.myOrg.entities.Person.class);

    StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder()
            .applySettings(configuration.getProperties());
    SessionFactory sessionFactory = configuration.buildSessionFactory(builder.build());
    return sessionFactory;
}

Answer 6

在休眠状态下，

session.createQuery("select first_name from Customerv"). 

这Customerv是您的实体名称，而不是您的表名称

Answer 7

也许这样会更清楚，当然也有道理。

@Entity
@Table(name = "users")

/**
 * 
 * @author Ram Srinvasan
 * Use class name in NamedQuery
 * Use table name in NamedNativeQuery
 */
@NamedQueries({ @NamedQuery(name = "findUserByName", query = "from User u where u.name= :name") })

@NamedNativeQueries({ @NamedNativeQuery(name = "findUserByNameNativeSQL", query = "select * from users u where u.name= :name", resultClass = User.class) })
public class User implements Principal {
...
}

Answer 8

即使我们使用类名，如果我们在不同的包中有两个具有相同名称的类，还有一次机会出现此异常。我们会遇到这个问题。

我认为 hibernate 可能会产生歧义并引发此异常，因此解决方案是使用完整的限定名称（例如com.test.Customerv）

我添加了这个答案，这将有助于我提到的场景。我遇到同样的情况，卡住了一段时间。

Answer 9

这意味着您的表未映射到 JPA。表的名称错误（可能区分大小写），或者您需要在 XML 文件中添加一个条目。

快乐编码:)

Answer 10

如果使用JPA批注创建实体，然后确保表名与@Table批注而不是@Entity一起映射。

映射不正确：

@Entity(name="DB_TABLE_NAME")
public class DbTableName implements Serializable {
   ....
   ....
}

正确映射的实体：

@Entity
@Table(name="DB_TABLE_NAME")
public class DbTableName implements Serializable {
   ....
   ....
}

Answer 11

当我开始使用 Hibernate 时，我也遇到了类似的问题。总而言之，我可以说的是在 createQuery 中需要传递实体类的名称，而不是实体映射到的表名称。