Question

这是我第一次尝试Hibernate而且我遇到了配置方面的麻烦。我试图配置hibernate以使用MySQL并在应用程序启动时自动创建表。问题是Hibernate（v4.3.11）正确（我认为）读到我想使用MySQL方言，但它用其他方言生成代码。请看一下应用程序输出...

我有没有忘记的事情？提前感谢您的帮助。

应用程序输出：

cze 24, 2016 11:39:01 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
cze 24, 2016 11:39:01 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.3.11.Final}
cze 24, 2016 11:39:01 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000205: Loaded properties from resource hibernate.properties: {hibernate.connection.driver_class=com.mysql.jdbc.Driver, hibernate.dialect=org.hibernate.dialect.MySQLDialect, hibernate.connection.useUnicode=true, hibernate.format_sql=true, hibernate.connection.CharSet=UTF-8, hibernate.connection.username=root, hibernate.hbm2ddl.auto=create, hibernate.connection.url=jdbc:mysql://localhost/czymdojade?useUnicode=true&characterEncoding=UTF-8&characterSetResults=UTF-8, hibernate.bytecode.use_reflection_optimizer=false, hibernate.show_sql=true, hibernate.connection.password=****, hibernate.connection.characterEncoding=UTF-8}
cze 24, 2016 11:39:01 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
cze 24, 2016 11:39:01 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
cze 24, 2016 11:39:01 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost/czymdojade?useUnicode=true&characterEncoding=UTF-8&characterSetResults=UTF-8]
cze 24, 2016 11:39:01 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000046: Connection properties: {useUnicode=true, user=root, password=****, CharSet=UTF-8, characterEncoding=UTF-8}
cze 24, 2016 11:39:01 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000006: Autocommit mode: false
cze 24, 2016 11:39:01 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
cze 24, 2016 11:39:01 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
cze 24, 2016 11:39:01 PM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
cze 24, 2016 11:39:01 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
cze 24, 2016 11:39:01 PM org.hibernate.tool.hbm2ddl.SchemaExport execute
INFO: HHH000227: Running hbm2ddl schema export
Hibernate: 
    drop table if exists lines
cze 24, 2016 11:39:01 PM org.hibernate.tool.hbm2ddl.SchemaExport perform
ERROR: HHH000389: Unsuccessful: drop table if exists lines
cze 24, 2016 11:39:01 PM org.hibernate.tool.hbm2ddl.SchemaExport perform
ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'lines' at line 1
Hibernate: 
    create table lines (
        id integer not null auto_increment,
        line varchar(255) not null,
        url TEXT not null,
        primary key (id)
    )
cze 24, 2016 11:39:01 PM org.hibernate.tool.hbm2ddl.SchemaExport perform
ERROR: HHH000389: Unsuccessful: create table lines (id integer not null auto_increment, line varchar(255) not null, url TEXT not null, primary key (id))
cze 24, 2016 11:39:01 PM org.hibernate.tool.hbm2ddl.SchemaExport perform
ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'lines (
        id integer not null auto_increment,
        line varchar(255) no' at line 1
cze 24, 2016 11:39:01 PM org.hibernate.tool.hbm2ddl.SchemaExport execute
INFO: HHH000230: Schema export complete
Hibernate: 
    insert 
    into
        lines
        (line, url) 
    values
        (?, ?)
cze 24, 2016 11:39:02 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 1064, SQLState: 42000
cze 24, 2016 11:39:02 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'lines (line, url) values ('10', 'http://www.mpk.poznan.pl/component/transport/10' at line 1
cze 24, 2016 11:39:02 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper$StandardWarningHandler logWarning
WARN: SQL Warning Code: 1064, SQLState: 42000
cze 24, 2016 11:39:02 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper$StandardWarningHandler logWarning
WARN: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'lines (line, url) values ('10', 'http://www.mpk.poznan.pl/component/transport/10' at line 1
could not execute statement

HibernateUtil.java 如下：

package pl.rosiakit.hibernate;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;

public class HibernateUtil
{
    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {

        Configuration cfg=new Configuration();
        cfg.addAnnotatedClass(pl.rosiakit.hibernate.model.Line.class);

        StandardServiceRegistryBuilder builder 
            = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties());


        SessionFactory factory= cfg.buildSessionFactory(builder.build());  

        //sessionFactory.setPackagesToScan(new String[] { "pl.rosiakit.model" });

        return factory;
    }

    public static SessionFactory getSessionFactory()    {
        return sessionFactory;
    } 

    public static void shutdown() {
        getSessionFactory().close();
    }
}

我的 hibernate.properties ：

hibernate.connection.driver_class=com.mysql.jdbc.Driver
hibernate.connection.url=jdbc:mysql://localhost/czymdojade?useUnicode=true&characterEncoding=UTF-8&characterSetResults=UTF-8
hibernate.connection.username=root
hibernate.connection.password=
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.show_sql=true
hibernate.format_sql=true
hibernate.hbm2ddl.auto=create
hibernate.connection.CharSet=UTF-8
hibernate.connection.characterEncoding=UTF-8
hibernate.connection.useUnicode=true

线型：

@Entity
@Table(name = "lines")
public class Line implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @Column(nullable = false)
    private String line;

    @Column(nullable = false)
    private String url;

    // getters and setters...
}

我的部分申请

private int saveLine(String number, String url){

    Line line = new Line();
    line.setLine(number);
    line.setUrl(url);

    Session session = HibernateUtil.getSessionFactory().openSession();
    session.beginTransaction();

    int id = (Integer) session.save(line);
    session.getTransaction().commit();
    session.close();
    return id;
}

Answer 1

“lines”是MySql中的保留字。最简单的解决方案是为表格选择另一个名称。

Hibernate 4忽略了MySQL方言

1 个答案: