实体 Class 名称转换为 SQL table 带下划线的名称

Question

我定义了以下实体：

@Entity
@Table(name = "EmailTemplate")
public class EmailTemplate {

尽管有 table 注释，我还是收到了 java.sql.SQLException: Invalid object name 'email_template'。如何防止实体 class（例如 EmailTemplate）被转换为 email_template table 名称？

编辑：

我正在使用 Spring 引导：启动 JPA。从我的 build.gradle 文件中，

compile("org.springframework.boot:spring-boot-starter-data-jpa")

Answer 1

Spring 默认使用 org.springframework.boot.orm.jpa.SpringNamingStrategy 将驼峰命名法与下划线分开。尝试在 application.properties 中设置 spring.jpa.hibernate.naming-strategy=org.hibernate.cfg.EJB3NamingStrategy。查看 this and this 了解更多信息。

Answer 2

使用

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

Answer 3

对于 hibernate v5：

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

Answer 4

已解决。

无效的对象名称：带 JPA 的 Springboot（SQL 服务器）

在申请中。yaml/properties指定

spring.jpa.hibernate.naming.implicit-策略 spring.jpa.hibernate.naming.physical-策略

日本帕：显示-sql: false 休眠： ddl-auto: none # 非嵌入式模式时默认为 "none" 命名：隐式策略：org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl 物理策略：org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

Answer 5

org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute statement; SQL [n/a];     
nested exception is org.hibernate.exception.SQLGrammarException: could not execute statement

两者都是必需的：

implicit-strategy 
physical-strategy

Answer 6

在application.properties设置

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

Answer 7

在您的 appplication.properties.

中使用它

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

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

Answer 8

对于Spring Boot 2（用2.2.6.RELEASE检查过）应该是配置yml 文件：

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

所以你可以拥有这样的模型：

@Table(name = "tblDepartments")
public class Department {
    @Id
    @Column(name = "dpID")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @NotEmpty
    @Size(min = 1, max = 25)
    @Column(name = "dpName", length = 25)
    private String name;

并在启动时使用 data.sql:

填充表

INSERT INTO tblDepartments (dpName) VALUES ('Gryffindor');
INSERT INTO tblDepartments (dpName) VALUES ('Hufflepuff');

Answer 9

有两个最常见的org.hibernate.boot.model.naming.PhysicalNamingStrategy：

org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
org.hibernate.boot.model.naming.CamelCaseToUnderscoresNamingStrategy
# also deprecated in 2.6 in favor of CamelCaseToUnderscoresNamingStrategy
# for removal in 2.8
org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy

org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties 持有：

private void applyNamingStrategies(Map<String, Object> properties) {
    applyNamingStrategy(properties, AvailableSettings.IMPLICIT_NAMING_STRATEGY, this.implicitStrategy,
            () -> SpringImplicitNamingStrategy.class.getName());
    applyNamingStrategy(properties, AvailableSettings.PHYSICAL_NAMING_STRATEGY, this.physicalStrategy,
            () -> CamelCaseToUnderscoresNamingStrategy.class.getName());
}

所以默认情况下 CamelCaseToUnderscoresNamingStrategy 正在使用并且您有下划线...

实体 Class 名称转换为 SQL table 带下划线的名称

Entity Class name is transformed into SQL table name with underscores

jpa

spring-data-jpa

spring-boot