Exception in using Hibernate-优快云博客

本文详细解析了Hibernate在使用过程中的两种常见配置问题：UnsupportedOperationException异常出现的原因及其解决办法；HibernateException异常中关于Dialect未明确指定的问题及正确配置方式。

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1, java.lang.UnsupportedOperationException: The user must supply a JDBC connection

hibernate.properties vs. hibernate.cfg.xml is this:

if you use :
SessionFactory sf=new Configuration().buildSessionFactory();
then this will use the hibernate.properties

if you use:
SessionFactory sf=new Configuration().configure().buildSessionFactory();
Then this will use the hibernate.cfg.xml

another reason:hibernate.cfg.xml is in wrong configer,like this:

<property name="driver_class">oracle.jdbc.OracleDriver</property>
<property name="url">url</property>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="username">username</property>
<property name="password">password</property>

2, org.hibernate.HibernateException: Hibernate Dialect must be explicitly set

reason:hibernate.cfg.xml is in wrong configer,like this:

<property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="connection.url">url</property>
<property name="connection.dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="connection.username">username</property>
<property name="connection.password">password</property>

or this:

<property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="connection.url">url</property>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="connection.username">username</property>
<property name="connection.password">password</property>