Problemas com a consulta nomeada do hibernate
-
13-09-2020 - |
Pergunta
Sou novo na hibernação e estou tendo problemas com a anotação de consulta nomeada.Meu código é o seguinte e é mais ou menos gerado pelo NetBeans
A classe BasicUser:
package wmc.model;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import org.hibernate.annotations.NamedQueries;
import org.hibernate.annotations.NamedQuery;
import javax.persistence.OneToOne;
import javax.persistence.Table;
@Entity
@Table(name = "basic_user")
@NamedQueries({
@NamedQuery(name = "BasicUser.findAll", query = "SELECT b FROM BasicUser b"),
@NamedQuery(name = "BasicUser.findByFirstName", query = "SELECT b FROM BasicUser b WHERE b.firstName = :firstName"),
@NamedQuery(name = "BasicUser.findByLastName", query = "SELECT b FROM BasicUser b WHERE b.lastName = :lastName"),
@NamedQuery(name = "BasicUser.findByEmail", query = "SELECT b FROM BasicUser b WHERE b.email = :email"),
@NamedQuery(name = "BasicUser.findByPassword", query = "SELECT b FROM BasicUser b WHERE b.password = :password")})
public class BasicUser implements Serializable {
private static final long serialVersionUID = 1L;
@Basic(optional = false)
@Column(name = "First_Name")
private String firstName;
@Basic(optional = false)
@Column(name = "Last_Name")
private String lastName;
@Id
@Basic(optional = false)
@Column(name = "Email")
private String email;
@Basic(optional = false)
@Column(name = "Password")
private String password;
@OneToOne(cascade = CascadeType.ALL, mappedBy = "basicUser")
private StatUser statUser;
@JoinColumn(name = "Group_Name", referencedColumnName = "Group_Name")
@ManyToOne(optional = false)
private Groups groupName;
public BasicUser() {
}
...
E o arquivo 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.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://mysql.dinhost.net:3306/coffeedrinkers</property>
<property name="hibernate.connection.username">bla</property>
<property name="hibernate.connection.password">bla</property>
</session-factory>
</hibernate-configuration>
É aqui que tento usar a consulta:
public static boolean userExists(String email, String password) {
Session session = null;
try{
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session =sessionFactory.openSession();
Object object = session.getNamedQuery("wmc.model.BasicUser.findByEmail").
setString("email", email).uniqueResult();
BasicUser user = (BasicUser) object;
if(user != null && user.getPassword().equals(password)) {
return true;
}
}
catch(Exception e) {
e.printStackTrace();
}
return false;
}
Pelo que entendi não preciso fazer nenhum mapeamento xml's pois essa informação está nas anotações.
Agradeço qualquer ajuda.Agradeço antecipadamente:)
persistência.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="WMCPU" transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>coffeee</jta-data-source>
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="hibernate.hbm2ddl.auto" value="update"/>
</properties>
</persistence-unit>
</persistence>
e o sun-resources.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE resources PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 9.0 Resource Definitions //EN" "http://www.sun.com/software/appserver/dtds/sun-resources_1_3.dtd">
<resources>
<jdbc-connection-pool allow-non-component-callers="false" associate-with-thread="false" connection-creation-retry-attempts="0" connection-creation-retry-interval-in-seconds="10" connection-leak-reclaim="false" connection-leak-timeout-in-seconds="0" connection-validation-method="auto-commit" datasource-classname="com.mysql.jdbc.jdbc2.optional.MysqlDataSource" fail-all-connections="false" idle-timeout-in-seconds="300" is-connection-validation-required="false" is-isolation-level-guaranteed="true" lazy-connection-association="false" lazy-connection-enlistment="false" match-connections="false" max-connection-usage-count="0" max-pool-size="32" max-wait-time-in-millis="60000" name="mysql_coffeedrinkers_AnAmuserPool" non-transactional-connections="false" pool-resize-quantity="2" res-type="javax.sql.DataSource" statement-timeout-in-seconds="-1" steady-pool-size="8" validate-atmost-once-period-in-seconds="0" wrap-jdbc-objects="false">
<property name="serverName" value="mysql.dinhost.net"/>
<property name="portNumber" value="3306"/>
<property name="databaseName" value="coffeedrinkers"/>
<property name="User" value="bla"/>
<property name="Password" value="bla"/>
<property name="URL" value="jdbc:mysql://mysql.dinhost.net:3306/coffeedrinkers"/>
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
</jdbc-connection-pool>
<jdbc-resource enabled="true" pool-name="mysql_coffeedrinkers_AnAmuserPool" jndi-name="coffeee" object-type="user"/>
</resources>
Solução
O nome da sua consulta nomeada é realmente seu name
, não prefixe ao ligar getNamedQuery
BasicUser user = (BasicUser) session.getNamedQuery("BasicUser.findByEmail").
setString("email", email).uniqueResult();
A propósito, como você está usando anotações JPA, você deve preferir a API JPA à API Hibernate (ou seja,APPs EntityManager
sobre o Hibernate Session
).
Outras dicas
Se você está se perguntando como configurar o EntityManager do JPA, veja isto:
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager" p:entityManagerFactory-ref="emf"/>
<bean id="emf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="jpaVendorAdapter">
<bean id="jpaAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"
p:showSql="${hibernate.show_sql}"/>
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
</props>
</property>
<property name="packagesToScan" value="com.books.web.entities"></property>
<property name="loadTimeWeaver">
<bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>
</property>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
Depois de ter seus beans, você pode opcionalmente usar a anotação para obter o JPATransactionManager e usá-la para obter o EntityManagerFactory e usar a fábrica para obter seu EntityManager e então você pode criar sua consulta/consulta nomeada..etc
Em algum lugar acima dos atributos do membro da sua classe, conecte automaticamente o transactionManager usando o seguinte:
@Autowired
private JpaTransactionManager transactionManager;
public List<Book> findBookByCategory(String category){
EntityManagerFactory entityManagerFactory = transactionManager.getEntityManagerFactory();
EntityManager entityManager = entityManagerFactory.createEntityManager();
entityManager.getTransaction().begin();
List<Book> result = entityManager.createNamedQuery( "Book.findByCategory", Book.class )
.setParameter("category", category)
.getResultList();
entityManager.getTransaction().commit();
entityManager.close();
return result;
}
Os beans no topo desta postagem referem-se a algumas propriedades que estão em um arquivo de propriedades, portanto, certifique-se de ter o arquivo hibernate.properites com valores como abaixo:
hibernate.dialect org.hibernate.dialect.MySQLDialect
hibernate.show_sql true
hibernate.hbm2ddl.auto update
hibernate.generate_statistics true
hibernate.connection.driver_class com.mysql.jdbc.Driver
hibernate.connection.url jdbc:mysql://localhost:3306/foobardb?useUnicode=true&createDatabaseIfNotExist=true&characterEncoding=utf-8
hibernate.connection.username put_user_name_here
hibernate.connection.password put_password_here
hibernate.connection.CharSet utf8
hibernate.connection.characterEncoding utf8
hibernate.connection.useUnicode true
Para que os beans sejam criados com sucesso, você precisa dos jars hibernate-jpa e também pode precisar do jar validador do hibernate.Se você estiver usando o maven para gerenciar dependências em seu projeto, use estas dependências:
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>${spring.data.jpa.version}</version>
<exclusions>
<exclusion>
<artifactId>junit-dep</artifactId>
<groupId>junit</groupId>
</exclusion>
</exclusions>
</dependency>
<!-- JPA -->
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.0-api</artifactId>
<version>1.0.1.Final</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>${hibernate-validator.version}</version>
<scope>compile</scope>
<exclusions>
<exclusion>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
</exclusion>
</exclusions>
</dependency>
Espero que isto ajude :)