【方言】Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set

Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set

几种 方言配置差异

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
    <persistence-unit name="userPU" transaction-type="RESOURCE_LOCAL">
        <!--jpa的提供者-->
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <!--声明数据库连接的驱动-->
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>
            <!--jdbc数据库的连接地址-->
            <property name="hibernate.connection.url" value="jdbc:mysql://10.32.11.74:3306/jparest"/>
            <property name="hibernate.connection.username" value="root"/>
            <property name="hibernate.connection.password" value="123456"/>
            <!--配置方言-->
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>
            <!--激活查询日志功能-->
            <property name="hibernate.show_sql" value="true"/>
            <!--优雅地输出Sql-->
            <property name="hibernate.format_sql" value="true"/>
            <!--添加一条解释型标注-->
            <property name="hibernate.use_sql_comments" value="false"/>
            <!--配置如何根据java模型生成数据库表结构,常用update,validate-->
            <property name="hibernate.hbm2ddl.auto" value="update"/>
        </properties>
    </persistence-unit>
</persistence>

 <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="${hibernate.showSql}" />
                <property name="generateDdl" value="true" />

                <property name="databasePlatform"
                          value="org.hibernate.dialect.MySQL5Dialect">
                </property>
            </bean>
        </property>

<beans>
<bean id="entityManagerFactory"class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="generateDdl" value="true"/>
<property name="database" value="HSQL"/>
</bean>
</property>
<property name="persistenceUnitName" value="jpa.sample"/>
</bean>
<bean id="transactionManager"class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
<jdbc:embedded-database id="dataSource" type="HSQL"/>
<jpa:repositories base-package="org.springframework.data.jpa.example.repository.simple"/>
</beans>

 RDBMS 方言

DB2	org.hibernate.dialect.DB2Dialect
DB2 AS/400	org.hibernate.dialect.DB2400Dialect
DB2 OS390	org.hibernate.dialect.DB2390Dialect
PostgreSQL	org.hibernate.dialect.PostgreSQLDialect
MySQL	org.hibernate.dialect.MySQLDialect
MySQL with InnoDB	org.hibernate.dialect.MySQLInnoDBDialect
MySQL with MyISAM	org.hibernate.dialect.MySQLMyISAMDialect
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 DB	org.hibernate.dialect.SAPDBDialect
Informix	org.hibernate.dialect.InformixDialect
HypersonicSQL	org.hibernate.dialect.HSQLDialect
Ingres	org.hibernate.dialect.IngresDialect
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
Firebird	org.hibernate.dialect.FirebirdDialect