mysql數據庫中不存在表

Question

我使用 JPA 作為數據庫，我在我的實體類中正確定義了一對多和一對一聯接，但它無法為我的收據實體類創建表。 我不明白我哪里出錯了。 我完成了實體類的檢查，但我找不到我的錯誤。 以下是我在運行應用程序時遇到的錯誤類型。

org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "alter table receipt add constraint FK57qulpfkyxvba4mmdup6l3vot foreign key (problem_id) references disease (problem_id)" via JDBC Statement
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.applySqlString(AbstractSchemaMigrator.java:562) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.applySqlStrings(AbstractSchemaMigrator.java:507) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.applyForeignKeys(AbstractSchemaMigrator.java:433) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.performMigration(AbstractSchemaMigrator.java:249) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.doMigration(AbstractSchemaMigrator.java:114) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:184) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:73) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:318) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:468) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1259) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) ~[spring-orm-5.3.10.jar:5.3.10]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365) ~[spring-orm-5.3.10.jar:5.3.10]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:409) ~[spring-orm-5.3.10.jar:5.3.10]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:396) ~[spring-orm-5.3.10.jar:5.3.10]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341) ~[spring-orm-5.3.10.jar:5.3.10]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1863) ~[spring-beans-5.3.10.jar:5.3.10]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) ~[spring-beans-5.3.10.jar:5.3.10]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:620) ~[spring-beans-5.3.10.jar:5.3.10]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.10.jar:5.3.10]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.10.jar:5.3.10]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.10.jar:5.3.10]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.10.jar:5.3.10]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.10.jar:5.3.10]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1154) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:908) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) ~[spring-boot-2.5.5.jar:2.5.5]
    at com.nillmani.hospitalmanagement.HospitalManagementApplicationKt.main(HospitalManagementApplication.kt:13) ~[main/:na]
Caused by: java.sql.SQLSyntaxErrorException: Table 'hospital-management.receipt' doesn't exist
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120) ~[mysql-connector-java-8.0.26.jar:8.0.26]
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122) ~[mysql-connector-java-8.0.26.jar:8.0.26]
    at com.mysql.cj.jdbc.StatementImpl.executeInternal(StatementImpl.java:764) ~[mysql-connector-java-8.0.26.jar:8.0.26]
    at com.mysql.cj.jdbc.StatementImpl.execute(StatementImpl.java:648) ~[mysql-connector-java-8.0.26.jar:8.0.26]
    at com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:94) ~[HikariCP-4.0.3.jar:na]
    at com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java) ~[HikariCP-4.0.3.jar:na]
    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:54) ~[hibernate-core-5.4.32.Final.jar:5.4.32.Final]
    ... 33 common frames omitted

收據.kt

package com.nillmani.hospitalmanagement.entity

import java.time.LocalDate
import javax.persistence.*

@Entity
data class Receipt(
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    val receipeId:Long=-1,
    val details :String="",
    val barcode : String ="",
    val drug_details: String="",
    val usage : String ="",
    val delivery_Date : LocalDate= LocalDate.now(),
    val diseaseId:Long=-1,//refere to  problmeID
    val patientId:Long=-1,
    val status : Int=0,
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "problemId",referencedColumnName = "problemId")
    val disease: Disease
)

疾病.kt

package com.nillmani.hospitalmanagement.entity

import com.nillmani.hospitalmanagement.entity.enum.ProblemStatus
import org.jetbrains.annotations.NotNull
import javax.persistence.*

@Entity
data class Disease(
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    val problemId:Long=-1,
    val diseaseName:String="",
    val diseaseDetails:String="",
    val problemStatus : ProblemStatus,
    var status : Int=0,
    val seekPersonId : Long=-1,//Basically Belongs form patientID
    val admissionId : Long =-1,
    @NotNull
    @ManyToOne(cascade = [CascadeType.ALL],fetch = FetchType.LAZY)
    @JoinColumn(name = "patientid",referencedColumnName = "patientid")
    val patient: Patient,
    @OneToMany(cascade = [CascadeType.ALL],fetch = FetchType.LAZY,mappedBy = "disease")
    val receipes :List<Receipt> = ArrayList()
)

我提供了這兩個表之間的連接，但是每個實體類都存在於數據庫中，但收據實體類不能存在於數據庫中。 這種問題的原因是什么

Answer 1

由於您在 Hibernate 中使用 Jpa，因此您可以設置
spring.jpa.generate-ddl=true或
spring.jpa.hibernate.ddl-auto=create在 application.properties 文件中spring.jpa.hibernate.ddl-auto=create以初始化表

注意：每次重新啟動應用程序時，將 ddl-auto 設置為 create 將刪除您的表。 您可能想改用更新。