如果未使用spring-boot设置"hibernate.dialect"，则对DialectResolutionInfo的访问不能为null

本文介绍了如果未使用spring-boot设置"hibernate.dialect"，则对DialectResolutionInfo的访问不能为null的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试在spring-boot项目中配置休眠状态.

I am trying to configure hibernate in my spring-boot project.

我有application.properties文件

I have application.properties file

spring.datasource.url=jdbc:mysql:url?useSSL=false
spring.datasource.username=name
spring.datasource.password=password

hibernate.connection.driver_class = com.mysql.jdbc.Driver
hibernate.connection.url = jdbc:mysql:url
hibernate.connection.username = name
hibernate.connection.password = password
hibernate.c3p0.min_size=5
hibernate.c3p0.max_size=20
hibernate.c3p0.timeout=1800
hibernate.c3p0.max_statements=50
hibernate.dialect=org.hibernate.dialect.MySQLDialect

以及在UserDAO类中注册用户的方法:

And method for registering user in UserDAO class:

public void registerUser(User u){
    Session session = factory.openSession();
    Transaction tx = null;
    try {
        tx = session.beginTransaction();
        session.save(u);
        tx.commit();
    } catch (HibernateException e) {
        if (tx!=null) tx.rollback();
        e.printStackTrace();
    } finally {
        session.close();
    }
    System.out.println("yay all done");
}

但是我收到错误:

> Caused by: org.hibernate.service.spi.ServiceException: Unable to
> create requested service
> [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]   at
> org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:275)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:237)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.injectServices(DefaultIdentifierGeneratorFactory.java:152)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.service.internal.AbstractServiceRegistryImpl.injectDependencies(AbstractServiceRegistryImpl.java:286)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:243)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:214)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.boot.internal.InFlightMetadataCollectorImpl.<init>(InFlightMetadataCollectorImpl.java:179)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:119)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:84)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:474)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:85)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:689)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:724)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> com.groups.data.UserDAO.<init>(UserDAO.java:18) ~[classes/:na]    ... 52
> common frames omitted Caused by: org.hibernate.HibernateException:
> Access to DialectResolutionInfo cannot be null when
> 'hibernate.dialect' not set   at
> org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:100)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:54)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:137)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:94)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     at
> org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263)
> ~[hibernate-core-5.3.2.Final.jar:5.3.2.Final]     ... 66 common frames
> omitted

我已按要求配置了方言，我什至尝试创建良好的旧hibernate.cfg.xml文件，但错误仍然相同(甚至似乎忽略了该文件).

I have configured dialect as it requires, i have even tried creating good old hibernate.cfg.xml file but the error remained the same ( it even seemed it ignored the file).

为什么会发生ist?从字面上看，昨天它没有问题.今天，我尝试创建cfg文件，但该文件停止工作(已删除).

Why is ist happening? Literally yesterday it worked without problem. Today i tried creating the cfg file and it stopped working ( deleted it already ).

我尝试配置越多的休眠方式，似乎就越激怒了正在使用它的任何人，并且无法使其正常工作.

The more i try to configure hibernate the more it seems it was made to anger anyone who is using it and impossible to make it work.

这可能是什么问题?

感谢帮助！

推荐答案

您是否已将此行添加到application.properties文件中?

Have you added this line to your application.properties file ?

spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect

DB2 AS/400
org.hibernate.dialect.DB2400Dialect

DB2 OS390
org.hibernate.dialect.DB2390Dialect

PostgreSQL
org.hibernate.dialect.PostgreSQLDialect

MySQL
org.hibernate.dialect.MySQLDialect

带有InnoDB的MySQL
org.hibernate.dialect.MySQLInnoDBDialect

MySQL with InnoDB
org.hibernate.dialect.MySQLInnoDBDialect

带有MyISAM的MySQL
org.hibernate.dialect.MySQLMyISAMDialect

MySQL with MyISAM
org.hibernate.dialect.MySQLMyISAMDialect

Oracle(任何版本)
org.hibernate.dialect.OracleDialect

Oracle (any version)
org.hibernate.dialect.OracleDialect

Oracle 9i/10g
org.hibernate.dialect.Oracle9Dialect

Sybase
org.hibernate.dialect.SybaseDialect

Sybase Anywhere
org.hibernate.dialect.SybaseAnywhereDialect

Microsoft SQL Server
org.hibernate.dialect.SQLServerDialect

SAP数据库
org.hibernate.dialect.SAPDBDialect

SAP DB
org.hibernate.dialect.SAPDBDialect

Informix
org.hibernate.dialect.InformixDialect

HypersonicSQL
org.hibernate.dialect.HSQLDialect

Ingres
org.hibernate.dialect.IngresDialect

进度
org.hibernate.dialect.ProgressDialect

Progress
org.hibernate.dialect.ProgressDialect

Mckoi SQL
org.hibernate.dialect.MckoiDialect

Interbase
org.hibernate.dialect.InterbaseDialect

Pointbase
org.hibernate.dialect.PointbaseDialect

FrontBase
org.hibernate.dialect.FrontbaseDialect

火鸟
org.hibernate.dialect.FirebirdDialect

Firebird
org.hibernate.dialect.FirebirdDialect

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