百木园关于springboot配置多数据源，整理了这篇笔记，分享给有需要的小伙伴们，视频看的动力节点王鹤老师讲的springboot
视频资源：
一、目录结构
目录结构
二、依赖包（pom.xml）
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.2</version>
</dependency>
</dependencies>三、配置文件
server:
port: 8080
spring:
datasource:
first:
driver-class-name: com.mysql.jdbc.Driver
jdbc-url: jdbc:mysql://localhost:3306/first?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: root
second:
driver-class-name: com.mysql.jdbc.Driver
jdbc-url: jdbc:mysql://localhost:3306/second?useUnicode=true&characterEncoding=utf8&allowMultiQueries=true
username: root
password: root
jpa:
hibernate:
ddl-auto: update
naming:
physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy
implicit-strategy: org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy
show-sql: true
database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
database: mysql四、多数据源配置（jpa）
1. DataSourceConfiguration
package com.cetc.config;
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;
import javax.sql.DataSource;
/**
* 数据库配置
*/
@Configuration
public class DataSourceConfiguration {
/**
* 第一个数据连接，默认优先级最高
* @return
*/
@Bean(name = \"dataSourceFirst\")
@Primary
@ConfigurationProperties(prefix = \"spring.datasource.first\")
public DataSource dataSourceFirst() {
//这种方式的配置默认只满足spring的配置方式，如果使用其他数据连接（druid）,需要自己独立获取配置
return DataSourceBuilder.create().build();
}
/**
* 第二个数据源
* @return
*/
@Bean(name = \"dataSourceSecond\")
@ConfigurationProperties(prefix = \"spring.datasource.second\")
public DataSource dataSourceSecond() {
return DataSourceBuilder.create().build();
}
}说明：其实这里配置已经完成了，这里就配置了两个数据源了。可以加入对应的JdbcTemplate,这里不做介绍，比较简单
2. JpaFirstConfiguration
package com.cetc.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.domain.EntityScan;
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.annotation.EnableTransactionManagement;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
/**
* 第一个数据源，jpa的相关配置
*/
@Configuration
@EntityScan(basePackages = \"com.cetc.domain.first\")
//1、实体扫描
//2、实体管理ref
//3、事务管理
@EnableJpaRepositories(
basePackages = \"com.cetc.repository.first\",
entityManagerFactoryRef = \"firstEntityManagerFactoryBean\",
transactionManagerRef = \"firstTransactionManager\")
@EnableTransactionManagement
public class JpaFirstConfiguration {
//第一个数据源，可以不加Qualifier
@Autowired
@Qualifier(\"dataSourceFirst\")
private DataSource dataSource;
//jpa其他参数配置
@Autowired
private JpaProperties jpaProperties;
//实体管理工厂builder
@Autowired
private EntityManagerFactoryBuilder factoryBuilder;
/**
* 配置第一个实体管理工厂的bean
* @return
*/
@Bean(name = \"firstEntityManagerFactoryBean\")
@Primary
public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {
return factoryBuilder.dataSource(dataSource)
//这一行的目的是加入jpa的其他配置参数比如（ddl-auto: update等）
//当然这个参数配置可以在事务配置的时候也可以
.properties(jpaProperties.getHibernateProperties(new HibernateSettings()))
.packages(\"com.cetc.domain.first\")
.persistenceUnit(\"firstPersistenceUnit\")
.build();
}
/**
* EntityManager不过解释，用过jpa的应该都了解
* @return
*/
@Bean(name = \"firstEntityManager\")
@Primary
public EntityManager entityManager() {
return entityManagerFactoryBean().getObject().createEntityManager();
}
/**
* jpa事务管理
* @return
*/
@Bean(name = \"firstTransactionManager\")
@Primary
public JpaTransactionManager transactionManager() {
JpaTransactionManager jpaTransactionManager = new JpaTransactionManager();
jpaTransactionManager.setEntityManagerFactory(entityManagerFactoryBean().getObject());
return jpaTransactionManager;
}
}3. JpaSecondConfiguration
package com.cetc.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.domain.EntityScan;
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.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.persistence.EntityManager;
import javax.sql.DataSource;
/**
* 第二个数据源，jpa的相关配置
*/
@Configuration
@EntityScan(basePackages = \"com.cetc.domain.second\")
//1、实体扫描
//2、实体管理ref
//3、事务管理
@EnableJpaRepositories(
basePackages = \"com.cetc.repository.second\",
entityManagerFactoryRef = \"secondEntityManagerFactoryBean\",
transactionManagerRef = \"secondTransactionManager\")
@EnableTransactionManagement
public class JpaSecondConfiguration {
//第二个数据源，必须加Qualifier
@Autowired
@Qualifier(\"dataSourceSecond\")
private DataSource dataSource;
//jpa其他参数配置
@Autowired
private JpaProperties jpaProperties;
//实体管理工厂builder
@Autowired
private EntityManagerFactoryBuilder factoryBuilder;
/**
* 配置第二个实体管理工厂的bean
* @return
*/
@Bean(name = \"secondEntityManagerFactoryBean\")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean() {
return factoryBuilder.dataSource(dataSource)
.properties(jpaProperties.getHibernateProperties(new HibernateSettings()))
.packages(\"com.cetc.domain.second\")
.persistenceUnit(\"secondPersistenceUnit\")
.build();
}
/**
* EntityManager不过解释，用过jpa的应该都了解
* @return
*/
@Bean(name = \"secondEntityManager\")
public EntityManager entityManager() {
return entityManagerFactoryBean().getObject().createEntityManager();
}
/**
* jpa事务管理
* @return
*/
@Bean(name = \"secondTransactionManager\")
public JpaTransactionManager transactionManager() {
JpaTransactionManager jpaTransactionManager = new JpaTransactionManager();
jpaTransactionManager.setEntityManagerFactory(entityManagerFactoryBean().getObject());
return jpaTransactionManager;
}
}
来源：https://www.cnblogs.com/linkeke/p/16035595.html
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