Spring Boot 的 Hibernate 字段命名问题（命名策略）

Question

请注意，此代码确实适用于普通 Spring，但不适用于 Spring Boot(v1.3.3)，我是否缺少某些东西，因为这是从有效的 spring 应用程序导入的。下面的代码来自spring boot app

@Entity
@Table(name="project")
public class Project implements Serializable{

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="id")
    private int id;

    @Column(name="teamId")
    private int teamId;

    //private String Rentabiliteit;

    @Column
    //@Index(name="IProject_status",columnNames="Status")
    private String status;

    @Column
    //@Index(name="IProject_naam",columnNames="Naam")
    private String naam;
    //public Prototype m_Prototype;
    //public Team m_Team;

}

SQL

CREATE TABLE IF NOT EXISTS `project` (
`id` int(11) NOT NULL,
`teamId` int(11) DEFAULT NULL,
`status` varchar(255) DEFAULT NULL,
`naam` varchar(255) DEFAULT NULL
 ) ENGINE=InnoDB AUTO_INCREMENT=43 DEFAULT CHARSET=latin1;

错误

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:           
 Unknown column 'project0_.team_id' in 'field list'

已编辑：Application.yml

spring:

mvc:
  view:
    prefix: /WEB-INF/jsp/
    suffix: .jsp

datasource:
    url: jdbc:mysql://localhost:3306/oxyplast
    username: oxyplastuser
    password: oxyplastuserpw

jpa:
  properties:
    hibernate:
      current_session_context_class: org.springframework.orm.hibernate4.SpringSessionContext 
      namingStrategy: org.hibernate.cfg.DefaultNamingStrategy

Answer 1

自 SPRING-BOOT 1.4 以来

从 1.4 开始，由于切换到 Hibernate 5，命名策略已更新为 SpringPhysicalNamingStrategy 其中should be very close 为 1.3 默认值。

另请参阅：

• Spring's naming strategy

---

以前的版本

Spring Boot 提供 ImprovedNamingStrategy 作为默认命名策略，这使得 Hibernate 搜索 team_id 列（从 int teamId 字段推断）。由于您的表中不存在此列，因此这是错误的原因。来自 Hibernate 文档：

一种改进的命名策略，它更喜欢嵌入下划线而不是混合大小写名称

你有两个选择：

1. 明确提供列名为@Column(name="teamId")。在早期的 Boot 版本中曾经有一个 bug，现在没有了。

2. 在 Spring Boot 属性中更改命名策略，并告诉它使用EJB3NamingStrategy，它不会将camelCase 转换为snake_case，而是保持原样。 p>

Answer 2

以下策略对我有用

spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.DefaultComponentSafeNamingStrategy

Answer 3

最新版本：

    spring-boot-starter-data-jpa: ➡ 1.5.2.RELEASE
    hibernate-core:5.0.12.Final

这个类

PhysicalNamingStrategyStandardImpl

需要扩展并添加到休眠属性中。

这是一个完整的工作版本

    public class PhysicalNamingStrategyImpl extends PhysicalNamingStrategyStandardImpl implements Serializable {

    public static final PhysicalNamingStrategyImpl INSTANCE = new PhysicalNamingStrategyImpl();

    @Override
    public Identifier toPhysicalTableName(Identifier name, JdbcEnvironment context) {
        String nameModified;
        // Do whatever you want with the name modification
        return new Identifier(nameModified, name.isQuoted());
    }

}

    @Override
    public Identifier toPhysicalColumnName(Identifier name, JdbcEnvironment context) {
         String nameModified;
        // Do whatever you want with the name modification
        return new Identifier(nameModified, name.isQuoted());
    }

在配置数据源时应该像这样将它链接到休眠状态。

properties.put("hibernate.physical_naming_strategy", "my.Package.PhysicalNamingStrategyImpl");

这是数据源配置的完整工作版本

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;


@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "entityManagerFactory",
        basePackages = { "com.xxxxxx.repository" }
)
public class SharedDataSourceConfig {

    @Value("${startup.ddl-auto}")
    String hbm2ddl;

    @Primary
    @Bean(name = "dataSource")
    @ConfigurationProperties("spring.datasource.shared")
    public DataSource customerDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "entityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(
            EntityManagerFactoryBuilder builder,
            @Qualifier("dataSource") DataSource dataSource) {
        Map<String, Object> properties = new HashMap<String, Object>();
        properties.put("hibernate.hbm2ddl.auto", hbm2ddl);
        properties.put("hibernate.physical_naming_strategy", "my.package.PhysicalNamingStrategyImpl");
        return builder
                .dataSource(dataSource)
                .packages(PackageScannerHelper.getPackagesToScan())
                .persistenceUnit("shared")
                .properties(properties)
                .build();
    }

    @Primary
    @Bean(name = "transactionManager")
    public PlatformTransactionManager transactionManager(
            @Qualifier("entityManagerFactory") EntityManagerFactory
                    entityManagerFactory
    ) {
        return new JpaTransactionManager(entityManagerFactory);
    }
}

Answer 4

如果您使用的是 Spring Boot 2.0.2 和 Hibernate 5.3.4，则设置以下属性将解决此问题。

spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

Answer 5

这对我来说适用于 spring boot 1.4.0 和 hibernate entitymanager 4.3.8.Final

application.properties

spring.jpa.hibernate.naming.implicit-strategy=org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

Answer 6

application.properties

spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.DefaultComponentSafeNamingStrategy

以上属性对我有用。 休眠 4.3.11.Final spring boot 1.4.2.RELEASE