本资源提供了一个基于Spring Boot框架实现双数据源连接的例子，同时支持Oracle与MySQL数据库的访问和操作。下载后可直接运行示例代码进行学习研究。
使用Spring Boot连接多个数据源，并且不同的DAO层对应不同的数据库（例如Oracle、MySQL）。以下是相关的源代码示例：
1. 配置文件中定义多个数据源：
```yaml
spring:
datasource:
primary-datasource: # 主数据源配置，如mysql
url: jdbc:mysql://localhost:3306/dbname?useSSL=false&serverTimezone=UTC
username: root
password: password
secondary-datasource: # 备用数据源配置，如oracle
url: jdbc:oracle:thin:@localhost:1521/orclpdb
username: scott
password: tiger
```
2. 创建DataSourceConfig类：
```java
@Configuration
public class DataSourceConfig {
@Bean(name = primaryDatasource)
@ConfigurationProperties(prefix = spring.datasource.primary-datasource)
public DataSource primaryDatasource() {
return DataSourceBuilder.create().build();
}
@Bean(name = secondaryDatasource)
@ConfigurationProperties(prefix = spring.datasource.secondary-datasource)
public DataSource secondaryDatasource() {
return DataSourceBuilder.create().build();
}
}
```
3. 配置多数据源的Jpa配置：
```java
@Configuration
public class JpaConfig {
@Autowired
private EntityManagerFactoryBuilder builder;
@Bean(name = primaryEntityManager)
public LocalContainerEntityManagerFactoryBean primaryEntityManager(@Qualifier(primaryDatasource) DataSource dataSource) {
return builder.dataSource(dataSource).packages(com.example.primary).persistenceUnit(primaryPersistenceUnit).build();
}
@Bean(name = secondaryEntityManager)
public LocalContainerEntityManagerFactoryBean secondaryEntityManager(@Qualifier(secondaryDatasource) DataSource dataSource) {
return builder.dataSource(dataSource).packages(com.example.secondary).persistenceUnit(secondaryPersistenceUnit).build();
}
}
```
4. 配置数据源的事务管理器：
```java
@Configuration
public class TransactionConfig {
@Autowired
private PlatformTransactionManager primaryPlatformTransactionManager;
@Bean(name = primaryTransactionManager)
public DataSourceTransactionManager primaryDataSourceTransactionManager(@Qualifier(primaryDatasource) DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = secondaryTransactionManager)
public DataSourceTransactionManager secondaryDataSourceTransactionManager(@Qualifier(secondaryDatasource) DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
}
```
5. 创建Repository接口：
```java
public interface PrimaryDao extends JpaRepository {}
public interface SecondaryDao extends JpaRepository {}
```
以上步骤帮助您配置了Spring Boot项目中连接多个数据源，并且通过不同的DAO层映射到对应的数据库。
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