java - Hibernate 的 NamedQueries 问题

Question

我在我的 JPA 项目 Eclipselink 中使用 NanedQueries(如下)作为持久化提供者:

@Entity
@Table(name = "login")
@NamedQueries({
    @NamedQuery(name = "Login.random", query = "SELECT l FROM Login l WHERE l.pk = :randomPk"),
    @NamedQuery(name = "Login.max", query = "SELECT MAX(l.pk) FROM Login l")
})

但是在我将 Hibernate 更改为我的持久性提供程序之后，我收到以下错误:

java.lang.IllegalArgumentException: org.hibernate.QueryException: unexpected char: '{' [SELECT...

我使用 Hibernate 3.2.5(MySQL 方言)

Answer 1

没有您的确切配置会使这变得困难。但是我对 hibernate 3.2.5.GA 没有问题

我创建了以下登录域对象:

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import java.io.Serializable;

@Entity
@Table(name = "login")
@NamedQueries({
        @NamedQuery(name = "Login.random", query = "select l FROM Login l WHERE l.pk = :randomPk"),
        @NamedQuery(name = "Login.max", query = "select max(l.pk) from Login l")
})
public class Login implements Serializable {

    private Long pk;
    private String username;

    public Login() {}

    public Login(Long pk, String username) {
        this.pk = pk;
        this.username = username;
    }

    @Id
    public Long getPk() {
        return pk;
    }

    public void setPk(Long pk) {
        this.pk = pk;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
}

和测试类:

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.AnnotationConfiguration;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import sky.sns.domain.Login;

import static org.junit.Assert.assertEquals;

public class AnnotationTest {

    private static SessionFactory sessionFactory;
    private Session session;
    private Transaction transaction;

    @BeforeClass
    public static void initialise() {
        sessionFactory = new AnnotationConfiguration().configure("/hibernate-annotation.cfg.xml").buildSessionFactory();
    }

    @Before
    public void setUp() {
        session = sessionFactory.getCurrentSession();
        transaction = session.beginTransaction();
    }

    @After
    public void tearDown() {
        transaction.rollback();
    }

    @Test
    public void createUser() {
        Login login = new Login(1L, "foo");
        session.save(login);
        session.flush();
        session.clear();
        Login persistedLogin = (Login)session.get(Login.class, 1L);
        assertEquals(login.getPk(), persistedLogin.getPk());
    }

    @Test
    public void obtainUserByIdNamedQuery() {
        Login login = new Login(1L, "foo");
        session.save(login);
        session.flush();
        session.clear();
        Login persistedLogin = (Login)session.getNamedQuery("Login.random").setLong("randomPk", 1L).uniqueResult();
        assertEquals(login.getPk(), persistedLogin.getPk());
    }

    @Test
    public void obtainMaxUserIdNamedQuery() {
        Login login = new Login(1L, "foo");
        session.save(login);
        session.flush();
        session.clear();
        Long maxId = (Long)session.getNamedQuery("Login.max").uniqueResult();
        assertEquals(login.getPk(), maxId);
    }
}

我的hibernate-annotation.hbm.xml文件如下:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.jboss.org/dtd/hibernate/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>

        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_owner</property>
        <property name="hibernate.connection.username">hibernate_owner</property>
        <property name="hibernate.connection.password">hibernate</property>

        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable second-level cache. -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <property name="hibernate.format_sql">false</property>
        <property name="hibernate.use_sql_comments">false</property>

        <mapping class="sky.sns.domain.Login" />

    </session-factory>
</hibernate-configuration>

你能在你的环境中试试这个吗，让我知道你的表现如何