java Hibernate继承类型。连接阻止了表的创建
我有两个类,“OrderBase”和“OrderPay”,我正试图实现“InheritanceType.JOINED”类型的继承
虽然每个类的表和单个表都可以很好地工作,但一旦我将类型更改为“JOINED”就无法创建它,我也不知道为什么
我在切换继承类型时删除并重新创建了模式,以确保这不是问题所在
我试图实现该类型继承的任何其他类也会发生这种情况
我的表格创建策略是“创建”: 春天jpa。冬眠自动创建
将其更改为“update”时,即使该表存在于数据库中(抛出错误之前和之后),错误仍将持续存在
我还创建了一个新项目,以确保没有任何其他因素阻止它运行,并且仍然会发生相同的错误
我在github上分享了这个项目。在localhost上使用mysql创建模式的规范在应用程序中。属性文件: https://github.com/Danielmethner/brownbag
以下是课程:
- 订单库。爪哇
package com.brownbag_api.model;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
@Entity
@Table(name = "ORDER_BASE")
@Inheritance(strategy = InheritanceType.JOINED)
public class OrderBase implements Serializable {
private static final long serialVersionUID = -3458221490393509305L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "ID")
private Long id;
@NotNull
@Column(name = "AMOUNT")
private double amount;
public Order() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public double getAmount() {
return amount;
}
public void setAmount(double amount) {
this.amount = amount;
}
}
- 订单支付。爪哇
package com.brownbag_api.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.validation.constraints.NotNull;
@Entity
public class OrderPay extends OrderBase {
private static final long serialVersionUID = 4643589803146964779L;
@NotNull
@Column(name = "BOOK_TEXT")
private String bookText;
public OrderPay() {
}
public String getBookText() {
return bookText;
}
public void setBookText(String bookText) {
this.bookText = bookText;
}
}
堆栈跟踪如下(实际上归结为“未找到父类表”)
原因:javax。坚持不懈PersistenceException:[PersistenceUnit:default]无法生成Hibernate SessionFactory;嵌套的异常是org。冬眠MappingException:无法实例化持久化组织。冬眠坚持者。实体联合子类TyperMaster 原因:org。冬眠MappingException:无法实例化持久化组织。冬眠坚持者。实体联合子类TyperMaster 原因:org。冬眠断言失败:表brownbag。找不到订单库
波姆。xml:
<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.brownbag</groupId>
<artifactId>api</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>api</name>
<description>API for brownbag project</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
# 1 楼答案
你打错了。可能您继承了javax。坚持不懈标准秩序
如果您将OrderPay更改为从正确的OrderBase类扩展,则一切都将按预期工作,并创建表:
此外,请删除此属性:
您已经在spring中定义了要连接的数据库。数据源。网址