Hibernate + PostgreSQL：关系不存在-SQL错误：0，SQLState：42P01

Question

我在尝试使用PostgreSQL和Hibernate时遇到一些问题，更具体地说，是标题中提到的问题。我已经在网上搜索了几个小时，但没有找到适合我的解决方案。

我正在为Web开发人员使用Eclipse Java EE IDE。在Ubuntu 9.10上使用HibernateTools，Hibernate
3，PostgreSQL 8.4.3构建ID：20090920-1017

以下是相关文件：

消息类

package hello;

        public class Message {
         private Long id;
         private String text;

         public Message() {
         }

         public Long getId() {
          return id;
         }

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

         public String getText() {
          return text;
         }

         public void setText(String text) {
          this.text = text;
         }
        }

Message.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="hello">
  <class 
   name="Message"
   table="public.messages">
   <id  name="id" column="id">
    <generator class="assigned"/>
   </id>
   <property name="text" column="messagetext"/>
   </class>
</hibernate-mapping>

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
        <property name="hibernate.connection.password">bar</property>
        <property name="hibernate.connection.url">jdbc:postgresql:postgres/tommy</property>
        <property name="hibernate.connection.username">foo</property>
        <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
        <property name="show_sql">true</property>
        <property name="log4j.logger.org.hibernate.type">DEBUG</property>
        <mapping resource="hello/Message.hbm.xml"/> 
    </session-factory>
</hibernate-configuration>

主要

package hello;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class App {

 public static void main(String[] args) {
  SessionFactory sessionFactory = new Configuration().configure()
    .buildSessionFactory();

  Message message = new Message();
  message.setText("Hello Cruel World");
  message.setId(2L);

  Session session = null;
  Transaction transaction = null;
  try {
   session = sessionFactory.openSession();
   transaction = session.beginTransaction();
   session.save(message);
  } catch (Exception e) {
   System.out.println("Exception attemtping to Add message: "
     + e.getMessage());

  } finally {
   if (session != null && session.isOpen()) {
    if (transaction != null)
     transaction.commit();
    session.flush();
    session.close();
   }

  }
 }
}

表结构：

foo=# \d messages
 Table "public.messages"
   Column    |  Type   | Modifiers 
-------------+---------+-----------
 id          | integer | 
 messagetext | text    |

运行时的Eclipse控制台输出

Apr 28, 2010 11:13:53 PM org.hibernate.cfg.Environment <clinit>
INFO: Hibernate 3.5.1-Final
Apr 28, 2010 11:13:53 PM org.hibernate.cfg.Environment <clinit>
INFO: hibernate.properties not found
Apr 28, 2010 11:13:53 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: Bytecode provider name : javassist
Apr 28, 2010 11:13:53 PM org.hibernate.cfg.Environment <clinit>
INFO: using JDK 1.4 java.sql.Timestamp handling
Apr 28, 2010 11:13:53 PM org.hibernate.cfg.Configuration configure
INFO: configuring from resource: /hibernate.cfg.xml
Apr 28, 2010 11:13:53 PM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: Configuration resource: /hibernate.cfg.xml
Apr 28, 2010 11:13:53 PM org.hibernate.cfg.Configuration addResource
INFO: Reading mappings from resource : hello/Message.hbm.xml
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.HbmBinder bindRootPersistentClassCommonValues
INFO: Mapping class: hello.Message -> public.messages
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.Configuration doConfigure
INFO: Configured SessionFactory: null
Apr 28, 2010 11:13:54 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: Using Hibernate built-in connection pool (not for production use!)
Apr 28, 2010 11:13:54 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: Hibernate connection pool size: 20
Apr 28, 2010 11:13:54 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: autocommit mode: false
Apr 28, 2010 11:13:54 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: using driver: org.postgresql.Driver at URL: jdbc:postgresql:postgres/tommy
Apr 28, 2010 11:13:54 PM org.hibernate.connection.DriverManagerConnectionProvider configure
INFO: connection properties: {user=foo, password=****}
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: RDBMS: PostgreSQL, version: 8.4.3
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: JDBC driver: PostgreSQL Native Driver, version: PostgreSQL 8.4 JDBC4 (build 701)
Apr 28, 2010 11:13:54 PM org.hibernate.dialect.Dialect <init>
INFO: Using dialect: org.hibernate.dialect.PostgreSQLDialect
Apr 28, 2010 11:13:54 PM org.hibernate.engine.jdbc.JdbcSupportLoader useContextualLobCreation
INFO: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
Apr 28, 2010 11:13:54 PM org.hibernate.transaction.TransactionFactoryFactory buildTransactionFactory
INFO: Using default transaction strategy (direct JDBC transactions)
Apr 28, 2010 11:13:54 PM org.hibernate.transaction.TransactionManagerLookupFactory getTransactionManagerLookup
INFO: No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Automatic flush during beforeCompletion(): disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Automatic session close at end of transaction: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: JDBC batch size: 15
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: JDBC batch updates for versioned data: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Scrollable result sets: enabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: JDBC3 getGeneratedKeys(): enabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Connection release mode: auto
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Default batch fetch size: 1
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Generate SQL with comments: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Order SQL updates by primary key: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Order SQL inserts for batching: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory createQueryTranslatorFactory
INFO: Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
Apr 28, 2010 11:13:54 PM org.hibernate.hql.ast.ASTQueryTranslatorFactory <init>
INFO: Using ASTQueryTranslatorFactory
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Query language substitutions: {}
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: JPA-QL strict compliance: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Second-level cache: enabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Query cache: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory createRegionFactory
INFO: Cache region factory : org.hibernate.cache.impl.NoCachingRegionFactory
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Optimize cache for minimal puts: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Structured second-level cache entries: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Echoing all SQL to stdout
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Statistics: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Deleted entity synthetic identifier rollback: disabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Default entity-mode: pojo
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Named query checking : enabled
Apr 28, 2010 11:13:54 PM org.hibernate.cfg.SettingsFactory buildSettings
INFO: Check Nullability in Core (should be disabled when Bean Validation is on): enabled
Apr 28, 2010 11:13:54 PM org.hibernate.impl.SessionFactoryImpl <init>
INFO: building session factory
Apr 28, 2010 11:13:55 PM org.hibernate.impl.SessionFactoryObjectFactory addInstance
INFO: Not binding factory to JNDI, no JNDI name configured
Hibernate: insert into public.messages (messagetext, id) values (?, ?)
Apr 28, 2010 11:13:55 PM org.hibernate.util.JDBCExceptionReporter logExceptions
WARNING: SQL Error: 0, SQLState: 42P01
Apr 28, 2010 11:13:55 PM org.hibernate.util.JDBCExceptionReporter logExceptions
SEVERE: Batch entry 0 insert into public.messages (messagetext, id) values ('Hello Cruel World', '2') was aborted.  Call getNextException to see the cause.
Apr 28, 2010 11:13:55 PM org.hibernate.util.JDBCExceptionReporter logExceptions
WARNING: SQL Error: 0, SQLState: 42P01
Apr 28, 2010 11:13:55 PM org.hibernate.util.JDBCExceptionReporter logExceptions
SEVERE: ERROR: relation "public.messages" does not exist
  Position: 13
Apr 28, 2010 11:13:55 PM org.hibernate.event.def.AbstractFlushingEventListener performExecutions
SEVERE: Could not synchronize database state with session
org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:179)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:375)
 at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
 at hello.App.main(App.java:31)
Caused by: java.sql.BatchUpdateException: Batch entry 0 insert into public.messages (messagetext, id) values ('Hello Cruel World', '2') was aborted.  Call getNextException to see the cause.
 at org.postgresql.jdbc2.AbstractJdbc2Statement$BatchResultHandler.handleError(AbstractJdbc2Statement.java:2569)
 at org.postgresql.core.v3.QueryExecutorImpl$1.handleError(QueryExecutorImpl.java:459)
 at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1796)
 at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:407)
 at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch(AbstractJdbc2Statement.java:2708)
 at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
 ... 8 more
Exception in thread "main" org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:179)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:375)
 at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
 at hello.App.main(App.java:31)
Caused by: java.sql.BatchUpdateException: Batch entry 0 insert into public.messages (messagetext, id) values ('Hello Cruel World', '2') was aborted.  Call getNextException to see the cause.
 at org.postgresql.jdbc2.AbstractJdbc2Statement$BatchResultHandler.handleError(AbstractJdbc2Statement.java:2569)
 at org.postgresql.core.v3.QueryExecutorImpl$1.handleError(QueryExecutorImpl.java:459)
 at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1796)
 at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:407)
 at org.postgresql.jdbc2.AbstractJdbc2Statement.executeBatch(AbstractJdbc2Statement.java:2708)
 at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
 at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
 ... 8 more

PostgreSQL日志文件

2010-04-28 23:13:55 EEST LOG:  execute S_1: BEGIN
2010-04-28 23:13:55 EEST ERROR:  relation "public.messages" does not exist at character 13
2010-04-28 23:13:55 EEST STATEMENT:  insert into public.messages (messagetext, id) values ($1, $2)
2010-04-28 23:13:55 EEST LOG:  unexpected EOF on client connection

如果我将查询复制/粘贴到postgre命令行中，然后将值放在and中；之后，它可以工作。

一切都是小写，所以我不认为这是问题。

如果我切换到MySQL，则使用相同的代码执行相同的项目（我仅更改驱动程序，URL，身份验证），即可正常工作。

在Eclipse Datasource
Explorer中，我可以对数据库执行ping操作，并且成功。奇怪的是，我也从那里看不到桌子。它扩展了公共模式，但不扩展表。可能是一些权限问题？

谢谢！

Answer 1

您的JDBC URL是“ jdbc：postgresql：postgres /
tommy”，这很常见。该文档建议使用“
jdbc：//主机名/数据库名”。现代安装附带一个“
postgres”数据库，该数据库几乎绝对不是您要连接的数据库。我不知道JDBC驱动程序的URL解析有多严格。

您期望数据库名称和主机名是什么？例如，您以什么方式将psql连接到数据库？

提示：在postgresql.conf中，您可以考虑以下设置：

log_connections = on
log_disconnections = on
log_line_prefix = '%t %c %q%u@%h:%d '

如果错误是我所想的（您连接到错误的数据库），这将在postgresql.log文件中记录诸如数据库名称之类的错误。