Java jpa mysql表不存在自动生成不'；行不通

我正在尝试将员工实体插入数据库。我使用的是JPA，数据库是mysql。当我尝试插入实体时，它会告诉我必须创建表，我假设我不必创建表。实体将自动创建带有注释名称的表。请在下面查找异常和代码

    Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'gsq.articles' doesn't exist
Error Code: 1146
Call: CREATE TABLE articles (id INTEGER AUTO_INCREMENT NOT NULL, libelle VARCHAR(255), ENTREPRISE_id INTEGER, PRIMARY KEY (id))
Query: DataModifyQuery(sql="CREATE TABLE articles (id INTEGER AUTO_INCREMENT NOT NULL, libelle VARCHAR(255), ENTREPRISE_id INTEGER, PRIMARY KEY (id))")
[EL Fine]: 2017-11-12 20:57:29.914--ServerSession(162116790)--Connection(578752466)--CREATE TABLE entreprise (id INTEGER AUTO_INCREMENT NOT NULL, libelle VARCHAR(255) UNIQUE, PRIMARY KEY (id))
[EL Fine]: 2017-11-12 20:57:29.919--ServerSession(162116790)--SELECT 1
[EL Warning]: 2017-11-12 20:57:29.921--ServerSession(162116790)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'gsq.entreprise' doesn't exist
Error Code: 1146
Call: CREATE TABLE entreprise (id INTEGER AUTO_INCREMENT NOT NULL, libelle VARCHAR(255) UNIQUE, PRIMARY KEY (id))
Query: DataModifyQuery(sql="CREATE TABLE entreprise (id INTEGER AUTO_INCREMENT NOT NULL, libelle VARCHAR(255) UNIQUE, PRIMARY KEY (id))")
[EL Fine]: 2017-11-12 20:57:29.922--ServerSession(162116790)--Connection(578752466)--CREATE TABLE users (ID BIGINT AUTO_INCREMENT NOT NULL, password VARCHAR(255), type VARCHAR(255), username VARCHAR(255) UNIQUE, PRIMARY KEY (ID))
[EL Fine]: 2017-11-12 20:57:29.927--ServerSession(162116790)--SELECT 1
[EL Warning]: 2017-11-12 20:57:29.929--ServerSession(162116790)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'gsq.users' doesn't exist
Error Code: 1146
Call: CREATE TABLE users (ID BIGINT AUTO_INCREMENT NOT NULL, password VARCHAR(255), type VARCHAR(255), username VARCHAR(255) UNIQUE, PRIMARY KEY (ID))
Query: DataModifyQuery(sql="CREATE TABLE users (ID BIGINT AUTO_INCREMENT NOT NULL, password VARCHAR(255), type VARCHAR(255), username VARCHAR(255) UNIQUE, PRIMARY KEY (ID))")
[EL Fine]: 2017-11-12 20:57:29.93--ServerSession(162116790)--Connection(578752466)--ALTER TABLE articles ADD CONSTRAINT FK_articles_ENTREPRISE_id FOREIGN KEY (ENTREPRISE_id) REFERENCES entreprise (id)
[EL Fine]: 2017-11-12 20:57:29.935--ServerSession(162116790)--SELECT 1
[EL Warning]: 2017-11-12 20:57:29.936--ServerSession(162116790)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'gsq.articles' doesn't exist
Error Code: 1146
Call: ALTER TABLE articles ADD CONSTRAINT FK_articles_ENTREPRISE_id FOREIGN KEY (ENTREPRISE_id) REFERENCES entreprise (id)
Query: DataModifyQuery(sql="ALTER TABLE articles ADD CONSTRAINT FK_articles_ENTREPRISE_id FOREIGN KEY (ENTREPRISE_id) REFERENCES entreprise (id)")
[EL Fine]: 2017-11-12 20:57:30.035--ServerSession(162116790)--Connection(578752466)--SELECT id, libelle FROM entreprise
[EL Fine]: 2017-11-12 20:57:30.035--ServerSession(162116790)--SELECT 1
[EL Warning]: 2017-11-12 20:57:30.035--UnitOfWork(1734860123)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'gsq.entreprise' doesn't exist
Error Code: 1146
Call: SELECT id, libelle FROM entreprise
Query: ReadAllQuery(referenceClass=Entreprise sql="SELECT id, libelle FROM entreprise")
Exception in thread "AWT-EventQueue-0" javax.persistence.RollbackException: Transaction rolled back because transaction was set to RollbackOnly.
    at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commitInternal(EntityTransactionImpl.java:92)
    at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:63)
    at controlleur.Executerequest.closeEntityManager(Executerequest.java:73)
    at frame.ArticlesFram.MajComBox(ArticlesFram.java:385)
    at frame.ArticlesFram.<init>(ArticlesFram.java:53)
    at frame.ArticlesFram$13.run(ArticlesFram.java:501)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
    at java.awt.EventQueue.access$500(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:709)
    at java.awt.EventQueue$3.run(EventQueue.java:703)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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我没有使用eclipselink，但通过查看一些示例，可以看到每次都提到了以下4个属性：

<property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>
<property name="eclipselink.create-ddl-jdbc-file-name" value="createDDL_ddlGeneration.jdbc"/>
<property name="eclipselink.drop-ddl-jdbc-file-name" value="dropDDL_ddlGeneration.jdbc"/>
<property name="eclipselink.ddl-generation.output-mode" value="both"/>

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可能是原因吗？

我没有使用eclipselink，但通过查看几个示例，可以看到每次都提到了以下4个属性：

<property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>
<property name="eclipselink.create-ddl-jdbc-file-name" value="createDDL_ddlGeneration.jdbc"/>
<property name="eclipselink.drop-ddl-jdbc-file-name" value="dropDDL_ddlGeneration.jdbc"/>
<property name="eclipselink.ddl-generation.output-mode" value="both"/>

---

可能是原因吗？

问题在数据库级别，而不是jpa。我通过连接另一个数据库thx解决了问题。问题在数据库级别，而不是jpa。我通过连接另一个数据库thx解决了问题。它正在尝试创建表，当create tables语句出现在日志中时。它正在尝试创建表，而create tables语句出现在日志中时。您的数据库出现问题，而不是JPA/EclipseLink。尝试在JPA/EclipseLink之外连接，以帮助诊断可能出现的问题，或者在这里尝试一些答案是的，这是我的问题，我通过连接其他数据库解决了问题您的数据库有问题，而不是JPA/EclipseLink。尝试连接JPA/EclipseLink外部，以帮助诊断可能出现的问题，或者在这里尝试一些答案是的，这是我的问题，我通过连接其他数据库解决了它

<property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>
<property name="eclipselink.create-ddl-jdbc-file-name" value="createDDL_ddlGeneration.jdbc"/>
<property name="eclipselink.drop-ddl-jdbc-file-name" value="dropDDL_ddlGeneration.jdbc"/>
<property name="eclipselink.ddl-generation.output-mode" value="both"/>