application.properties配置文件中配置两个数据库连接：
#pm main
spring.datasource.primary.jdbc-url=jdbc:mysql://localhost:3306/
spring.datasource.primary.username=
spring.datasource.primary.password=
spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.primary.type=com.alibaba.druid.pool.DruidDataSource
#image
spring.datasource.secondary.jdbc-url=jdbc:mysql://localhost:3306/
spring.datasource.secondary.username=
spring.datasource.secondary.password=
spring.datasource.secondary.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.secondary.type=com.alibaba.druid.pool.DruidDataSource
创建一个配置类：
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
@Configuration
public class DataSourceConfig {
@Bean(name = "primaryDataSource")
@Qualifier("primaryDataSource")
@Primary//默认加载
@ConfigurationProperties(prefix="spring.datasource.primary")//配置文件中的前缀
public DataSource primaryDataSource() {
System.out.println("primary db built");
return DataSourceBuilder.create().build();
}
@Bean(name = "secondaryDataSource")
@Qualifier("secondaryDataSource")
@ConfigurationProperties(prefix="spring.datasource.secondary")
public DataSource secondaryDataSource() {
System.out.println("secondary db built");
return DataSourceBuilder.create().build();
}
}
两个数据库的配置文件：
主数据库：
import javax.persistence.EntityManager;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef="entityManagerFactoryPrimary",
transactionManagerRef="transactionManagerPrimary",
basePackages= { "com.qxmedical.pm.dao.system" })//对应dao层包
public class PrimaryConfig {
@Autowired
@Qualifier("primaryDataSource")
private DataSource primaryDataSource;
@Primary
@Bean(name = "entityManagerPrimary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
}
@Primary
@Bean(name = "entityManagerFactoryPrimary")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {
return builder.dataSource(primaryDataSource)
.packages("com.qxmedical.pm.entity.system")//对应实体包
.persistenceUnit("primaryPersistenceUnit")
.properties(getVendorProperties())
.build();
}
@Autowired(required=false)
private JpaProperties jpaProperties;
//spring1.5不是这样获取的
private Map getVendorProperties() {
HibernateSettings settings = new HibernateSettings();
return jpaProperties.getHibernateProperties(settings);
}
@Primary
@Bean(name = "transactionManagerPrimary")
public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
}
}
//从数据库
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef="entityManagerFactorySecondary",
transactionManagerRef="transactionManagerSecondary",
basePackages= { "com.qxmedical.pm.dao.image" })
public class SecondaryConfig {
@Autowired
@Qualifier("secondaryDataSource")
private DataSource secondaryDataSource;
@Bean(name = "entityManagerSecondary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
}
@Bean(name = "entityManagerFactorySecondary")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {
return builder.dataSource(secondaryDataSource)
.packages("com.qxmedical.pm.entity.image")
.persistenceUnit("secondaryPersistenceUnit")
.properties(getVendorProperties())
.build();
}
@Autowired(required=false)
private JpaProperties jpaProperties;
private Map getVendorProperties() {
HibernateSettings settings = new HibernateSettings();
return jpaProperties.getHibernateProperties(settings);
}
@Bean(name = "transactionManagerSecondary")
public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
}
}