动态设置hibernate方言
动态设置hibernate方言
提问于 2018-05-11 20:51:45
我已经实现了Hibernate's multitenant database architecture，其中根据租户选择特定的数据库连接。我使用的是Spring 4.3和Hibernate 5.2。
当租户使用相同的RDBMS时，这一切都很好，但当它们不同时，我必须动态更改hibernate属性中的方言设置，我不知道如何更改。
我的hibernate属性在dispatcher-servlet.xml中
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="com.example"/>
<mvc:annotation-driven/>
<context:property-placeholder location="classpath:application.properties"/>
<tx:annotation-driven transaction-manager="transactionManager"/>
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean" >
<property name="packagesToScan">
<list>
<value>com.example.model</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<!--<prop key="hibernate.dialect">${hibernate.dialect}</prop>-->
<prop key="hibernate.show_sql">${hibernate.show_sql:false}</prop>
<prop key="hibernate.format_sql">${hibernate.format_sql:false}</prop>
<prop key="hibernate.multiTenancy">DATABASE</prop>
<prop key="hibernate.tenant_identifier_resolver">com.example.multitenancy.CurrentTenantIdentifierResolverImpl</prop>
<prop key="hibernate.multi_tenant_connection_provider">com.example.multitenancy.MultiTenantConnectionProviderImpl</prop>
</props>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
</beans>下面是Hibernate的CurrentTenantIdentifierResolver的实现
public class CurrentTenantIdentifierResolverImpl implements CurrentTenantIdentifierResolver {
@Override
public String resolveCurrentTenantIdentifier() {
Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
return Helper.getTenantFromAuthentication(authentication);
}
@Override
public boolean validateExistingCurrentSessions() {
return true;
}
}以及AbstractDataSourceBasedMultiTenantConnectionProviderImpl:的实现
public class MultiTenantConnectionProviderImpl extends AbstractDataSourceBasedMultiTenantConnectionProviderImpl {
@Override
protected DataSource selectAnyDataSource() {
return getDataSource("tenantId1");
}
@Override
protected DataSource selectDataSource(String tenantIdentifier) {
return getDataSource(tenantIdentifier);
}
private DataSource getDataSource(String prefix) {
Properties properties = new Properties();
try {
properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("application.properties"));
} catch (IOException e) {
throw new RuntimeException();
}
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(properties.getProperty(prefix + ".driverClassName"));
dataSource.setUrl(properties.getProperty(prefix + ".url"));
dataSource.setUsername(properties.getProperty(prefix + ".username"));
dataSource.setPassword(properties.getProperty(prefix + ".password"));
return dataSource;
}
}application.properties文件如下所示：
tenantId1.driverClassName = org.postgresql.Driver
tenantId1.url = <...>
tenantId1.username = <...>
tenantId1.password = <...>
tenantId2.driverClassName = com.mysql.jdbc.Driver
tenantId2.url = <...>
tenantId2.username = <...>
tenantId2.password = <...>有没有办法动态改变hibernate方言？
回答 2
Stack Overflow用户
发布于 2018-05-28 20:18:05
我不明白为什么您不能使用纯粹基于注释的配置来实现这一点。我这样设置我的方言：
properties.put("hibernate.dialect", "org.hibernate.dialect.SQLServerDialect");如果配置文件中的某个值设置为ON，我实际上有一些代码可以完全重建数据库以及一些测试数据。您应该能够通过切换到完全基于java的配置来执行相同的操作。
Stack Overflow用户
发布于 2021-09-22 07:59:55
如果您没有设置显式方言，hibenrate将使用DialectResolver实现类自动解析它。
您可以编写自己的autoresolver。OwnDialectResolver example
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50292775
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