Question

错误：

log4j：WARN找不到记录器的appender （org.hibernate.cfg.annotations.Version）。 log4j：WARN请初始化 log4j系统正常。线程＆＃34; main＆＃34;中的例外情况 org.hibernate.exception.GenericJDBCException：无法打开连接在 org.hibernate.exception.SQLStateConverter.handledNonSpecificException（SQLStateConverter.java:103）在 org.hibernate.exception.SQLStateConverter.convert（SQLStateConverter.java:91）在 org.hibernate.exception.JDBCExceptionHelper.convert（JDBCExceptionHelper.java:43）在 org.hibernate.exception.JDBCExceptionHelper.convert（JDBCExceptionHelper.java:29）在 org.hibernate.jdbc.ConnectionManager.openConnection（ConnectionManager.java:420）在 org.hibernate.jdbc.ConnectionManager.getConnection（ConnectionManager.java:144）在org.hibernate.jdbc.JDBCContext.connection（JDBCContext.java:119）在 org.hibernate.transaction.JDBCTransaction.begin（JDBCTransaction.java:57）在 org.hibernate.impl.SessionImpl.beginTransaction（SessionImpl.java:1326）在org.koushik.hibernate.HibernateTest.main（HibernateTest.java:20）引起：org.postgresql.util.PSQLException：致命：数据库＆＃34; 5432 / hibernatedb＆＃34;不存在于 org.postgresql.core.v3.ConnectionFactoryImpl.readStartupMessages（ConnectionFactoryImpl.java:691）在 org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl（ConnectionFactoryImpl.java:207）在 org.postgresql.core.ConnectionFactory.openConnection（ConnectionFactory.java:65）在org.postgresql.jdbc.PgConnection。（PgConnection.java:159）at org.postgresql.Driver.makeConnection（Driver.java:415）at org.postgresql.Driver.connect（Driver.java:283）at java.sql.DriverManager.getConnection（未知来源）at java.sql.DriverManager.getConnection（未知来源）at org.hibernate.connection.DriverManagerConnectionProvider.getConnection（DriverManagerConnectionProvider.java:110）在 org.hibernate.jdbc.ConnectionManager.openConnection（ConnectionManager.java:417） ......还有5个

码

hibernate.cfg.xml中

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration SYSTEM "hibernate-configuration-3.0.dtd"> 

  <hibernate-configuration>

  <session-factory>
    <!-- Database connection settings -->
    <property name="connection.driver_class">org.postgresql.Driver</property>
    <property name="connection.url">jdbc:postgresql://localhost/5432/hibernatedb</property>
    <property name="connection.username">postgres</property>
    <property name="connection.password">password</property>

    <!-- JDBC connection pool (use the built-in) -->
    <property name="connection.pool_size">1</property>

    <!-- SQL dialect -->
    <property name="dialect">org.hibernate.dialect.PostgreSQLDialect</property>

    <!-- Enable Hibernate's automatic session context management -->
    <property name="current_session_context_class">thread</property>

    <!-- Disable the second-level cache  
    <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> -->

    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">true</property>

    <!-- Drop and re-create the database schema on startup -->
    <property name="hbm2ddl.auto">create</property>
    <mapping class="org.javabrains.koushik.dto.UserDetails" />
    <!--    <mapping resource="org/hibernate/tutorial/domain/Event.hbm.xml"/> -->
  </session-factory>
</hibernate-configuration>

UserDetails.java

package org.javabrains.koushik.dto;

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class UserDetails {

@Id 
private int userID;
private String userName;

public int getUserID() {
    return userID;
}
public void setUserID(int userID) {
    this.userID = userID;
}
public String getUserName() {
    return userName;
}
public void setUserName(String userName) {
    this.userName = userName;
}





}

HibernateTest.java

package org.koushik.hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

import org.javabrains.koushik.dto.UserDetails;

public class HibernateTest {

    public static void main(String[] args) {


        UserDetails user = new UserDetails();
        user.setUserID(1);
        user.setUserName("First user");

        SessionFactory sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
        Session session =sessionFactory.openSession();
        session.beginTransaction();
        session.save(user);
        session.getTransaction().commit();

    }


}

Answer 1

您的连接网址似乎可能是错误。不应该是

jdbc:postgresql://localhost:5432/hibernatedb

Answer 2

检查您的连接网址路径，它应该是这样的：

<property name="connection.url">jdbc:postgresql://localhost:5432/hibernatedb</property>

如果这不起作用，请注意在PostgreSQL的情况下，如果可用，则使用端口5432是典型的。如果不是，大多数安装人员会选择下一个空闲端口，通常是5433.所以你可以输入这样的属性

<property name="connection.url">jdbc:postgresql://localhost:5433/hibernatedb</property>

如果你仍然无法弄清楚然后在你的堆栈跟踪中读取这一行，你可能会想到@RemyG试图说的话：

org.postgresql.util.PSQLException: FATAL: database "5432/hibernatedb" does not exist at

我的第一个hibernate程序出错了，请帮我解决错误

2 个答案: