如何解决“通过JDBC语句执行DDL时发生错误”更改表事件删除外键FKg0mkvgsqn8584qoql6a2rxheq”

Question

如何解决“通过JDBC语句执行DDL时发生错误”更改表事件删除外键FKg0mkvgsqn8584qoql6a2rxheq”

Fil*_*ipW 3 java mysql hibernate spring-boot

我正在尝试使用MySQL数据库启动spring boot项目，但是数据库存在一些问题。我尝试启动我的应用程序，并且服务器正在运行，但是休眠时不创建Tables等。

这是我的代码：

用户实体

 @Entity
   public class User {
      @Id
      @GeneratedValue(strategy = IDENTITY)
      private Long id;

      private String firstName;
      private String lastName;

      private String email;

      private String password;
      private String description;
      private String profile_photo;

      private LocalDate create;
      private LocalDate update;

      @OneToMany(mappedBy = "eventOwner")
      private List<Event> ownedEvents;

           public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public String getFirstName() {
    return firstName;
}

public void setFirstName(String firstName) {
    this.firstName = firstName;
}

public String getLastName() {
    return lastName;
}

public void setLastName(String lastName) {
    this.lastName = lastName;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public String getProfile_photo() {
    return profile_photo;
}

public void setProfile_photo(String profile_photo) {
    this.profile_photo = profile_photo;
}

public LocalDate getCreate() {
    return create;
}

public void setCreate(LocalDate create) {
    this.create = create;
}

public LocalDate getUpdate() {
    return update;
}

public void setUpdate(LocalDate update) {
    this.update = update;
}

public List<Event> getOwnedEvents() {
    return ownedEvents;
}

public void setOwnedEvents(List<Event> ownedEvents) {
    this.ownedEvents = ownedEvents;
}}

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事件实体

   @Entity
   @Table(name = "events")
   public class Event {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

private Double longitude;
private Double latitude;

private String description;
private String header;

private LocalDate startData;
private LocalDate endData;
private LocalDate creat;
private LocalDate update;
private Filters filters;

@ManyToOne
@JoinColumn(name = "owner_id")
private User eventOwner;

public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

public Double getLongitude() {
    return longitude;
}

public void setLongitude(Double longitude) {
    this.longitude = longitude;
}

public Double getLatitude() {
    return latitude;
}

public void setLatitude(Double latitude) {
    this.latitude = latitude;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public String getHeader() {
    return header;
}

public void setHeader(String header) {
    this.header = header;
}

public LocalDate getStartData() {
    return startData;
}

public void setStartData(LocalDate startData) {
    this.startData = startData;
}

public LocalDate getEndData() {
    return endData;
}

public void setEndData(LocalDate endData) {
    this.endData = endData;
}

public LocalDate getCreat() {
    return creat;
}

public void setCreat(LocalDate creat) {
    this.creat = creat;
}

public LocalDate getUpdate() {
    return update;
}

public void setUpdate(LocalDate update) {
    this.update = update;
}

public Filters getFilters() {
    return filters;
}

public void setFilters(Filters filters) {
    this.filters = filters;
}

public User getEventOwner() {
    return eventOwner;
}

public void setEventOwner(User eventOwner) {
    this.eventOwner = eventOwner;
}

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}

这是我的属性：

spring.datasource.url= jdbc:mysql://localhost:3306/some_database? 
requireSSL=false&useSSL=false
spring.datasource.username= user
spring.datasource.password= passw 
logging.level.org.hibernate.SQL= DEBUG
spring.jpa.hibernate.ddl-auto = create-drop
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL55Dialect

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这是我得到的错误

org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing 
DDL "alter table events drop foreign key FKg0mkvgsqn8584qoql6a2rxheq" via 
JDBC Statement

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和

org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing 
DDL "create table events (id bigint not null auto_increment, creat date, 
description varchar(255), end_data date, event_type integer, max_age 
integer not null, min_age integer not null, open_to_changes bit not null, 
pets_allowed bit not null, price_range integer, smoking_allowed bit not 
null, header varchar(255), latitude double precision, longitude double 
precision, start_data date, update date, owner_id bigint, primary key (id)) 
engine=InnoDB" via JDBC Statement
at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67) ~[hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.tool.schema.internal.SchemaCreatorImpl.applySqlString(SchemaCreatorImpl.java:440) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.tool.schema.internal.SchemaCreatorImpl.applySqlStrings(SchemaCreatorImpl.java:424) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.tool.schema.internal.SchemaCreatorImpl.createFromMetadata(SchemaCreatorImpl.java:315) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.tool.schema.internal.SchemaCreatorImpl.performCreation(SchemaCreatorImpl.java:166) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.tool.schema.internal.SchemaCreatorImpl.doCreation(SchemaCreatorImpl.java:135) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.tool.schema.internal.SchemaCreatorImpl.doCreation(SchemaCreatorImpl.java:121) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:155) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:72) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:310) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:467) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:939) [hibernate-core-5.3.7.Final.jar:5.3.7.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) [spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) [spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390) [spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377) [spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) [spring-orm-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804) [spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741) [spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) [spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) [spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) [spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) [spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) [spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1083) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:853) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]

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有人知道该如何解决吗？

Answer 1

小智 10

将spring.jpa.hibernate.ddl-auto = create-drop更改为update。它在开始时就删除了数据库，因此找不到所需的事件表来更改任何内容。

从创建删除更改为创建，它对我有用。 (3认同)

Answer 2

kyl*_*oki 9

看来这是一个与PostgreSQL保留字相关的错误。与SupaMario 的答案类似，将我的列名之一更改为

@Column(name = "name", nullable = false)

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到

@Column(name = "employee_name", nullable = false)

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Answer 3

小智 8

就我而言，出现此异常的问题是某些表的名称是为 MySQL 保留的。例如，“order”更名为：

@Column(name="orders")

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或者

例如

@ManyToOne(cascade = {CascadeType.ALL})
@JoinColumn(name = "fk_order",nullable = false)
private Order order;

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为我工作。

Answer 4

Sup*_*rio 6

就我而言，为什么会出现此异常的问题是，某些表具有保留给postgreSQL的名称。例如。“喜欢”或“用户”。更改名称：

@Table(name="likes")

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而且效果很好。也许有人有同样的问题。

遇到了同样的问题 - 完美解决了，谢谢！ (2认同)
谢谢！这也解决了我的问题。哦，试图解释 ORM 想要做什么真是麻烦。事情似乎总是“迷失在翻译中” (2认同)

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