我有以下问题。我想在我的应用程序中将 Spring Data CrudRepository 与 Hibernate 5 一起使用。作为数据库，我使用 MySQL 版本 5.7.21。 我认为我配置错误，因为当我运行应用程序时，我只能从数据库读取。当我使用任何其他 CrudRepository 方法时，例如。节省() 没有反应。在 Hibernate 日志中，我只看到读取的 Select 语句(应该有 insert 语句，但似乎 hibernate 没有创建它)。
使用 save(animal) 方法时的示例日志日志:
Hibernate: /* load com.entity.Animal */ select animal0_.animal_id as animal_i1_0_0_, animal0_.name as name2_0_0_, animal0_.type as type3_0_0_ from animal animal0_ where animal0_.animal_id=?
这只是 SpringData CrudRepository 的问题，因为当我将应用程序配置为仅使用 Hibernate 时，我可以使用 这个方法:
public void save(Animal animal) {
sessionFactory.getCurrentSession().save(animal);
}
我的问题是:我的配置做错了什么？我希望能够将我的实体保存到数据库。
我将非常感谢任何建议或链接。
我的配置: pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>train</groupId>
<artifactId>train</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>train Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>2.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.0.Final</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>5.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.1.3.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.7</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.4.2.Final</version>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<finalName>train</finalName>
</build>
</project>
AppConfig.java
package com.configuration;
import java.util.Properties;
import javax.sql.DataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.Database;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import com.entity.Animal;
@Configuration
@EnableWebMvc
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = "com")
@ComponentScan("com")
public class AppConfig{
// Configuration Beans
@Bean
public LocalSessionFactoryBean getSessionFactory() {
Properties hibernateProperties = new Properties();
hibernateProperties.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
hibernateProperties.put("hibernate.show_sql", "true");
hibernateProperties.put("hibernate.generate_statistics", false);
hibernateProperties.put("hibernate.hbm2ddl.auto", "update");
hibernateProperties.put("hibernate.use_sql_comments", true);
LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
sessionFactory.setDataSource(dataSource());
sessionFactory.setHibernateProperties(hibernateProperties);
sessionFactory.setAnnotatedClasses(Animal.class);
return sessionFactory;
}
@Bean(name="transactionManager")
public PlatformTransactionManager txManager(){
JpaTransactionManager jpaTransactionManager = new JpaTransactionManager(
entityManagerFactory(dataSource()).getObject());
return jpaTransactionManager;
}
@Bean
public DataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/projekt?useSSL=false");
dataSource.setUsername("Programowanie@localhost");
dataSource.setPassword("password");
return dataSource;
}
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
vendorAdapter.setPrepareConnection(true);
vendorAdapter.setGenerateDdl(true);
vendorAdapter.setDatabase(Database.MYSQL);
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setJpaVendorAdapter(vendorAdapter);
factory.setPackagesToScan("com");
factory.setDataSource(dataSource);
Properties hibernateProperties = new Properties();
hibernateProperties.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
hibernateProperties.put("hibernate.show_sql", "true");
hibernateProperties.put("hibernate.generate_statistics", false);
hibernateProperties.put("hibernate.hbm2ddl.auto", "update");
hibernateProperties.put("hibernate.use_sql_comments", true);
factory.setJpaProperties(hibernateProperties);
return factory;
}
}
实体:Animal.java
package com.entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name="animal")
public class Animal {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="animal_id", insertable=true)
private Long animalId;
@Column(name="name", insertable=true)
private String name;
@Column(name="type", insertable=true)
private String type;
public Long getAnimalId() {
return animalId;
}
public void setAnimalId(Long animalId) {
this.animalId = animalId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
}
AnimalController.java
package com;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.entity.Animal;
@RestController
@RequestMapping("/test")
public class AnimalController {
@Autowired private AnimalService animalService;
public AnimalController() {
}
public AnimalController(AnimalService animalService) {
this.animalService = animalService;
}
@GetMapping("/hello")
public String sayHello() {
return "Hello World!";
}
@GetMapping("/animal/{id}")
public Animal getGreeting(@PathVariable("id") Long id) {
return animalService.getAnimal(id);
}
@PostMapping("/animal")
public void saveGreeting(@RequestBody Animal animal) {
animalService.saveAnimal(animal);
}
}
AnimalService.java
package com;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.entity.Animal;
@Service
public class AnimalService {
@Autowired
private AnimalRepository animalRepository;
public Animal saveAnimal(Animal animal) {
return animalRepository.save(animal);
}
public Animal getAnimal(Long id) {
return animalRepository.findById(id).get();
}
}
AnimalRepository.java
package com;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import com.entity.Animal;
@Repository
@Transactional
public interface AnimalRepository extends CrudRepository<Animal, Long> {
}
最佳答案
@Transactional存储库接口(interface)上的注释没有多大帮助。它需要到达实际调用这些方法的地方，在您的情况下，这将是 AnimalService 。您可以将它们放在每个方法或类本身上。注释你的 Controller 也可能有效；根据设置，我发现它与 @Controller 冲突以前，但没有在这里检查您的代码。
但是，在一种情况下，此注释在界面上做了一些有用的事情:使用 @Transactional(readOnly = true)您可以更改界面中每个方法的该选项的默认值，并且可以将其设置为 false只有真正改变某些事情的方法。然而，这是一个应该稍后进行的优化。
您还使用 @Repository在存储库界面上。这没有额外的效果。它会触发异常转换，但 Spring Data 存储库无论如何都已经这样做了。
关于java - Spring Data CrudRepository 只读取(它不保存、更新或删除)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57749842/