在Eclipse Hibernate应用程序中使用Postgres“找不到关系”

时间：2013-04-27 10:03:08

标签： database hibernate postgresql

基于我之前未解决的问题PostgreSql does not "recognize" table created by Hibernate我想问一下我是否对从hibernate应用程序连接到PostgreSql数据库做了一些正确的事情。我倾向于认为问题在于与数据库的连接，我在过去两天内无法解决问题。实体如我的链接问题所示（由于空间需求，我不再写了）。我的cfg.xml文件是：

    

    <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
    <property name="hibernate.connection.url">jdbc:postgresql:template1</property>
    <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
    <property name="hibernate.connection.username">postgres</property>
    <property name="hibernate.connection.password">user</property>


    <property name="connection.pool_size">1</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.hbm2dll.auto">create</property>
    <property name="current_session_context_class">thread</property>
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

    <mapping class="com.al.hibernatetest.Department"/>
    <mapping class="com.al.hibernatetest.Employee"/>
</session-factory>

我已经看到了来自hibernate发行版配置文件的url连接，但我也尝试过使用jdbc：postgresql：testDB。 （testDB：我的数据库的名称）。

Eclipse中出现的错误是：

Apr 27, 2013 11:54:58 AM org.hibernate.annotations.common.Version <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
Apr 27, 2013 11:54:58 AM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.3.0.Beta1}
Apr 27, 2013 11:54:58 AM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Apr 27, 2013 11:54:58 AM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Apr 27, 2013 11:54:58 AM org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
Apr 27, 2013 11:54:58 AM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
Apr 27, 2013 11:54:58 AM org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
Apr 27, 2013 11:54:59 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000402: Using Hibernate built-in connection pool (not for production use!)
Apr 27, 2013 11:54:59 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000115: Hibernate connection pool size: 1
Apr 27, 2013 11:54:59 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000006: Autocommit mode: false
Apr 27, 2013 11:54:59 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000401: using driver [org.postgresql.Driver] at URL [jdbc:postgresql:template1]
Apr 27, 2013 11:54:59 AM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000046: Connection properties: {user=postgres, password=****}
Apr 27, 2013 11:54:59 AM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect
Apr 27, 2013 11:54:59 AM org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation
INFO: HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4
Apr 27, 2013 11:54:59 AM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
Apr 27, 2013 11:54:59 AM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Hibernate: insert into DEPARTMENT (DEPT_NAME) values (?)
Apr 27, 2013 11:54:59 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 0, SQLState: 42P01
Apr 27, 2013 11:54:59 AM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: ERROR: relation "department" does not exist
  Position: 13
Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not execute statement
    at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:122)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:136)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2967)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3478)
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:362)
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:203)
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:183)
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:167)
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:321)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:286)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:205)
    at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:190)
    at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:91)
    at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:764)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:756)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:752)
    at com.al.hibernatetest.Main.main(Main.java:24)
Caused by: org.postgresql.util.PSQLException: ERROR: relation "department" does not exist
  Position: 13
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1886)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:255)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:555)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:363)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:133)
    ... 22 more

PostgreSql日志文件始终包含以下消息：

2013-04-27 11:36:51 CEST ERROR:  relation "department" does not exist at character 13
2013-04-27 11:36:51 CEST STATEMENT:  insert into DEPARTMENT (DEPT_NAME) values ($1) RETURNING *
2013-04-27 11:36:51 CEST LOG:  could not receive data from client: No connection could be made because the target machine actively refused it.

知道问题的原因是什么？ Waht与数据库的连接有问题吗？ 它可以是一个丢失的罐子，换句话说不是使用合适的罐子？

P.S。：有些人认为问题是表名的大/小写。我试图在实体中将所有映射的名称从上到下更改，反之亦然，但它没有改变任何东西。

2 个答案:

答案 0 :(得分：2)

根据您在其他问题中的建议：

启动psql your_database并发出\ d以查看表格。

我不熟悉Hibernate，但很可能@Table（name =“DEPARTMENT”）等语句正在创建实际称为“DEPARTMENT”的表，而您的查询实际上是从DEPARTMENT查询（没有双引号） ），postgresql将其解释为部门。

如果是这样，修复是在创建表名时使用小写，或者在查询表时使Hibernate使用双引号和大写。

答案 1 :(得分：1)

我有类似的问题，我的表名是Message_History，我收到的错误信息是“引起：org.postgresql.util.PSQLException：ERROR：relation”message_history“不存在”，我不知道为什么它的lookig message_history我的hibernate配置将表名称称为Message_History。因为这是我的示例代码，所以我将DB中的表名更改为message_history，然后继续，但是如果列名中的低/高级护理也是如此，我也会遇到类似的问题。所以我将列名更改为小写，然后它对我来说非常好。

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