hibernate mysql datasource_springboot2.0.3使用jpa和hibernate的方式配置多数据源(sqlite和mysql)...

首先需要在pom.xml文件中添加以下依赖： ```xml <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.xerial</groupId> <artifactId>sqlite-jdbc</artifactId> <version>3.30.1</version> </dependency> ``` 然后配置application.yml文件，如下所示： ```yaml spring: datasource: mysql: url: jdbc:mysql://localhost:3306/mysql_db?useUnicode=true&characterEncoding=utf-8&useSSL=false driver-class-name: com.mysql.jdbc.Driver username: root password: root sqlite: url: jdbc:sqlite:/data/sqlite_db.db driver-class-name: org.sqlite.JDBC username: root password: root jpa: show-sql: true hibernate: ddl-auto: update properties: hibernate: dialect: org.hibernate.dialect.MySQL5Dialect ``` 接下来需要创建两个数据源的配置类，分别为MysqlConfig和SqliteConfig，代码如下所示： ```java @Configuration @EnableTransactionManagement @EnableJpaRepositories( entityManagerFactoryRef = "mysqlEntityManagerFactory", transactionManagerRef = "mysqlTransactionManager", basePackages = {"com.example.mysql.repository"}) public class MysqlConfig { @Primary @Bean(name = "mysqlDataSource") @ConfigurationProperties(prefix = "spring.datasource.mysql") public DataSource dataSource() { return DataSourceBuilder.create().build(); } @Primary @Bean(name = "mysqlEntityManagerFactory") public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("mysqlDataSource") DataSource dataSource) { return builder.dataSource(dataSource).packages("com.example.mysql.entity").persistenceUnit("mysql") .build(); } @Primary @Bean(name = "mysqlTransactionManager") public PlatformTransactionManager transactionManager( @Qualifier("mysqlEntityManagerFactory") EntityManagerFactory entityManagerFactory) { return new JpaTransactionManager(entityManagerFactory); } } ``` ```java @Configuration @EnableTransactionManagement @EnableJpaRepositories( entityManagerFactoryRef = "sqliteEntityManagerFactory", transactionManagerRef = "sqliteTransactionManager", basePackages = {"com.example.sqlite.repository"}) public class SqliteConfig { @Bean(name = "sqliteDataSource") @ConfigurationProperties(prefix = "spring.datasource.sqlite") public DataSource dataSource() { return DataSourceBuilder.create().build(); } @Bean(name = "sqliteEntityManagerFactory") public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("sqliteDataSource") DataSource dataSource) { return builder.dataSource(dataSource).packages("com.example.sqlite.entity").persistenceUnit("sqlite") .build(); } @Bean(name = "sqliteTransactionManager") public PlatformTransactionManager transactionManager( @Qualifier("sqliteEntityManagerFactory") EntityManagerFactory entityManagerFactory) { return new JpaTransactionManager(entityManagerFactory); } } ``` 注意事项： 1. 在MysqlConfig和SqliteConfig中需要使用`@EnableJpaRepositories`注解来指定数据源的repository所在包。 2. 在MysqlConfig和SqliteConfig中创建的EntityManagerFactory和TransactionManager需要使用`@Primary`注解来标识默认数据源。 3. application.yml中的`hibernate.dialect`需要根据不同的数据库进行修改。 4. 在repository中需要使用`@Qualifier`注解来指定使用的数据源。 使用多数据源时，需要在service或controller中使用`@Transactional("mysqlTransactionManager")`或`@Transactional("sqliteTransactionManager")`注解来指定使用的数据源。 至此，一个使用JPA和Hibernate配置多数据源的示例就完成了。