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我在尝试使用 PostgreSQL 和 Hibernate 时遇到了一些问题,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。
我正在使用面向 Web 开发人员的 Eclipse Java EE IDE。构建 ID:20090920-1017,在 Ubuntu 9.10 上使用 HibernateTools、Hibernate 3、PostgreSQL 8.4.3。
相关文件如下:
Message.class
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 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 命令行中并将值放入 ;在它之后,它起作用了。
一切都是小写的,所以我不认为这是个问题。
如果我切换到 MySQL,相同的代码相同的项目(我只更改驱动程序、URL、身份验证),它就可以工作。
在 Eclipse 数据源资源管理器中,我可以 ping 数据库并成功。奇怪的是我也看不到那里的 table 。它扩展了公共(public)架构,但不扩展表。可能是一些许可问题吗?
谢谢!
最佳答案
您的 JDBC URL 是“jdbc:postgresql:postgres/tommy”,这是不寻常的。 documentation建议“jdbc://hostname/databasename”。现代安装带有一个“postgres”数据库,几乎肯定不是您想要连接的;不知道JDBC驱动的URL解析有多严格。
您希望您的数据库名称和主机名是什么?例如以这种方式连接到数据库的 psql 参数是什么?
提示:在 postgresql.conf 中,您可能会考虑一些设置:
log_connections = on
log_disconnections = on
log_line_prefix = '%t %c %q%u@%h:%d '
如果错误如我所想(您连接到错误的数据库),这将在您的 postgresql.log 文件中记录数据库名称和错误等内容。
关于eclipse - hibernate + PostgreSQL : relation does not exist - SQL Error: 0, SQLState:42P01,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2732878/
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