I will organize the implementation method when using multi-data source with Spring boot.
Since Autoconfig is used, DB connection information is described in application.properties.
application.properties
#Primary DB
spring.datasource.url=jdbc:mysql://localhost:3306/primary_db?useSSL=false
spring.datasource.username=demo
spring.datasource.password=demo
spring.datasource.driverClassName=com.mysql.jdbc.Driver
#Secondary DB
secondary.datasource.url=jdbc:mysql://localhost:3306/secondary_db?useSSL=false
secondary.datasource.username=demo
secondary.datasource.password=demo
secondary.datasource.driverClassName=com.mysql.jdbc.Driver
Create the main class of Spring boot as usual.
DemoApplication
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args).close();
}
}
Define the primary dataSource and sqlSession. -Basepackage of repository class -SQLMap storage folder
PrimaryDbConfig
@Configuration
@MapperScan(basePackages = PrimaryDbConfig.BASE_PACKAGES
, sqlSessionTemplateRef = "primarySqlSessionTemplate")
public class PrimaryDbConfig {
public static final String BASE_PACKAGES = "com.example.demo.primary";
public static final String MAPPER_XML_PATH = "classpath:com/example/demo/primary/*.xml";
@Primary
@Bean(name = "primaryDataSource")
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource dataSource() {
return new DataSource();
}
@Primary
@Bean(name = "primarySqlSessionFactory")
public SqlSessionFactory sqlSessionFactory(@Qualifier("primaryDataSource") DataSource primaryDataSource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(primaryDataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MAPPER_XML_PATH));
return bean.getObject();
}
@Bean(name = "primarySqlSessionTemplate")
public SqlSessionTemplate sqlSessionTemplate(
@Qualifier("primarySqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
Define a secondary dataSource and sqlSession as above.
SecondaryDbConfig
@Configuration
@MapperScan(basePackages = SecondaryDbConfig.BASE_PACKAGES
, sqlSessionTemplateRef = "secondarySqlSessionTemplate")
public class SecondaryDbConfig {
public static final String BASE_PACKAGES = "com.example.demo.secondary";
public static final String MAPPER_XML_PATH = "classpath:com/example/demo/secondary/*.xml";
@Bean(name = "secondaryDataSource")
@ConfigurationProperties(prefix = "secondary.datasource")
public DataSource dataSource() {
return new DataSource();
}
@Bean(name = "secondarySqlSessionFactory")
public SqlSessionFactory sqlSessionFactory(@Qualifier("secondaryDataSource") DataSource secondaryDataSource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(secondaryDataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources(MAPPER_XML_PATH));
return bean.getObject();
}
@Bean(name = "secondarySqlSessionTemplate")
public SqlSessionTemplate sqlSessionTemplate(
@Qualifier("secondarySqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
Create each repository class.
PrimaryRepository
@Mapper
public interface PrimaryRepository {
public long selectCountFromPrimary();
}
SecondaryRepository
@Mapper
public interface SecondaryRepository {
public long selectCountFromSecondary();
}
Define the primary SqlMap in the following resource folder.
com
|-example
|-demo
|-primary
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.primary.PrimaryRepository">
<select id="selectCountFromPrimary" resultType="long">
select count(*) from emp;
</select>
</mapper>
Define a secondary SqlMap in the following resource folder.
com
|-example
|-demo
|-secondary
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.secondary.SecondaryRepository">
<select id="selectCountFromSecondary" resultType="long">
select count(*) from emp2;
</select>
</mapper>
Call the above repository and execute SQL.
@Autowired
private PrimaryRepository primaryRepository;
@Autowired
private SecondaryRepository secondaryRepository;
...
long countPrimary = primaryRepository.selectCountFromPrimary();
long countSecondary = secondaryRepository.selectCountFromSecondary();
As with Mybatis, describe the DB connection information in application.properties.
application.properties
#Primary DB
spring.datasource.url=jdbc:mysql://localhost:3306/primary_db?useSSL=false
spring.datasource.username=demo
spring.datasource.password=demo
spring.datasource.driverClassName=com.mysql.jdbc.Driver
#Secondary DB
secondary.datasource.url=jdbc:mysql://localhost:3306/secondary_db?useSSL=false
secondary.datasource.username=demo
secondary.datasource.password=demo
secondary.datasource.driverClassName=com.mysql.jdbc.Driver
spring.jpa.database=default
Create the main class of Spring boot as usual.
DemoApplication
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
Define the primary dataSource, entityManager and transactionManager. -Basepackage of repository class -Domain class basepackage
PrimaryDbConfig
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "entityManagerFactory"
, transactionManagerRef = "transactionManager"
, basePackages = { "com.example.demo.primary" })
public class PrimaryDbConfig {
@Primary
@Bean(name = "dataSource")
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource dataSource() {
return DataSourceBuilder.create().build();
}
@Primary
@Bean(name = "entityManagerFactory")
public LocalContainerEntityManagerFactoryBean entityManagerFactory(
EntityManagerFactoryBuilder builder,
@Qualifier("dataSource") DataSource dataSource) {
return builder.dataSource(dataSource).packages("com.example.demo.primary.domain").build();
}
@Primary
@Bean(name = "transactionManager")
public PlatformTransactionManager transactionManager(
@Qualifier("entityManagerFactory") EntityManagerFactory entityManagerFactory) {
return new JpaTransactionManager(entityManagerFactory);
}
}
Define the secondary dataSource, entityManager and transactionManager as above.
SecondaryDbConfig
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "secondaryEntityManagerFactory"
, transactionManagerRef = "secondaryTransactionManager"
, basePackages = {"com.example.demo.secondary" })
public class SecondaryDbConfig {
@Bean(name = "secondaryDataSource")
@ConfigurationProperties(prefix = "secondary.datasource")
public DataSource dataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "secondaryEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean secondaryEntityManagerFactory(
EntityManagerFactoryBuilder builder,
@Qualifier("secondaryDataSource") DataSource dataSource) {
return builder.dataSource(dataSource).packages("com.example.demo.secondary.domain").build();
}
@Bean(name = "secondaryTransactionManager")
public PlatformTransactionManager secondaryTransactionManager(
@Qualifier("secondaryEntityManagerFactory") EntityManagerFactory secondaryEntityManagerFactory) {
return new JpaTransactionManager(secondaryEntityManagerFactory);
}
}
Create each repository class and domain class.
PrimaryRepository
@Repository
public interface PrimaryRepository extends CrudRepository<Emp, String> {
public long count();
}
SecondaryRepository
@Repository
public interface SecondaryRepository extends CrudRepository<Emp2, String> {
public long count();
}
EmpDomain
@Entity
@Table(name="emp")
public class Emp {
@Id
@Column(name="emp_id")
private String empId;
@Column(name="dept_id")
private String deptId;
...
}
EmpDomain2
@Entity
@Table(name="emp2")
public class Emp2 {
@Id
@Column(name="emp_id")
private String empId;
@Column(name="dept_id")
private String deptId;
...
Call the repository class with the same feeling as Mybatis.
@Autowired
private PrimaryRepository primaryRepository;
@Autowired
private SecondaryRepository secondaryRepository;
...
long countPrimary = primaryRepository.selectCountFromPrimary();
long countSecondary = secondaryRepository.selectCountFromSecondary();
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