目录
简述
有时候,项目中会有需要用到多个数据源,本篇总结,使用JPA连接多个数据源,并在项目里面使用不同的数据源,后续再加上spring boot+mybatis配置多数据源,以及使用druid配置多数据源。
快速上手
(一) 配置两个数据源
spring:
primary:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/soil
username: lxtest
password: admin
secondary:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/soil2
username: lxtest
password: admin
读取两个配置源,构建两个数据源
新建配置类:DataSourceConfig
@Configuration
public class DataSourceConfig {
@Bean(name = "primaryDataSource")
@Qualifier("primaryDataSource")
@ConfigurationProperties(prefix="spring.primary.datasource")
public DataSource primaryDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "secondaryDataSource")
@Qualifier("secondaryDataSource")
@Primary
@ConfigurationProperties(prefix="spring.secondary.datasource")
public DataSource secondaryDataSource() {
return DataSourceBuilder.create().build();
}
}
配置
将数据源注入到 Factory,配置 repository、实体类的位置,两个数据源配置两个类。
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef="entityManagerFactoryPrimary",
transactionManagerRef="transactionManagerPrimary",
basePackages= { "com.lx.repository.soil1" })//设置dao(repo)所在位置
public class PrimaryConfig {
@Autowired
private JpaProperties jpaProperties;
@Autowired
@Qualifier("primaryDataSource")
private DataSource primaryDataSource;
@Bean(name = "entityManagerPrimary")
@Primary
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
}
@Bean(name = "entityManagerFactoryPrimary")
@Primary
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary (EntityManagerFactoryBuilder builder) {
return builder
.dataSource(primaryDataSource)
.properties(getVendorProperties(primaryDataSource))
.packages("com.lx.dto") //设置实体类所在位置
.persistenceUnit("primaryPersistenceUnit")
.build();
}
private Map<String, String> getVendorProperties(DataSource dataSource) {
return jpaProperties.getHibernateProperties(dataSource);
}
@Bean(name = "transactionManagerPrimary")
@Primary
PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
}
}
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef="entityManagerFactorySecondary",
transactionManagerRef="transactionManagerSecondary",
basePackages= { "com.lx.repository.soil2" })
public class SecondaryConfig {
@Autowired
private JpaProperties jpaProperties;
@Autowired
@Qualifier("secondaryDataSource")
private DataSource secondaryDataSource;
@Bean(name = "entityManagerSecondary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactorySecondary(builder).getObject().createEntityManager();
}
@Bean(name = "entityManagerFactorySecondary")
public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary (EntityManagerFactoryBuilder builder) {
return builder
.dataSource(secondaryDataSource)
.properties(getVendorProperties(secondaryDataSource))
.packages("com.lx.domain")
.persistenceUnit("secondaryPersistenceUnit")
.build();
}
private Map<String, String> getVendorProperties(DataSource dataSource) {
return jpaProperties.getHibernateProperties(dataSource);
}
@Bean(name = "transactionManagerSecondary")
PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
}
}
搞定!