SpringBoot-------实现多数据源Demo

之前SpringBoot出来时候就看了下Springboot,感觉的确精简掉了配置文件！

还是很方便的！没办法，我只是个菜鸟！

什么怎么启动Springboot什么的就不说了，

　　　具体的Demo地址我都是放在github上面，因为只有Demo才能更直观的学习和进去！

对其中出现的注解：

这里时对jpa进行的多数据源

　　　　　　　　

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef="entityManagerFactorySecondary",
        transactionManagerRef="transactionManagerSecondary",//这些都是默认的，看源码就知道了
        basePackages= { "springboot.domain.s" }) //设置Repository所在位置

这些注解是为了注册和配置一个数据源具体操作的实体类有

代码：

 package springboot;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 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.PlatformTransactionManager;
 import org.springframework.transaction.annotation.EnableTransactionManagement;

 import javax.persistence.EntityManager;
 import javax.sql.DataSource;
 import java.util.Map;

 @Configuration
 @EnableTransactionManagement
 @EnableJpaRepositories(
         entityManagerFactoryRef="entityManagerFactorySecondary",
         transactionManagerRef="transactionManagerSecondary",
         basePackages= { "springboot.domain.s" }) //设置Repository所在位置
 public class SecondaryConfig {

     @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("springboot.domain.s") //设置实体类所在位置
                 .persistenceUnit("secondaryPersistenceUnit")
                 .build();
     }

     @Autowired
     private JpaProperties jpaProperties;

     private Map<String, String> getVendorProperties(DataSource dataSource) {
         return jpaProperties.getHibernateProperties(dataSource);
     }

     @Bean(name = "transactionManagerSecondary")
     PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
         return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
     }

 }

其实都是固定的形式，你想挖掘就自己点进去看看，

当然这是数据源中得一个，另外一个也是一样的，

说到这：我们肯定要有配置数据源的配置文件，不然讲毛用都没！

application.properties

 spring.datasource.primary.url=jdbc:mysql://localhost:3306/test1
 spring.datasource.primary.username=root
 spring.datasource.primary.password=123456
 spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver

 spring.datasource.secondary.url=jdbc:mysql://localhost:3306/test2
 spring.datasource.secondary.username=root
 spring.datasource.secondary.password=123456
 spring.datasource.secondary.driver-class-name=com.mysql.jdbc.Driver
 server.port=80
 spring.jpa.properties.hibernate.hbm2ddl.auto=create-drop

讲到配置文件中得二个数据源，那么我们怎么获取到这二个数据源呢，如何加载进数据源呢，-----------------------------

-------------------擦--------------------------擦----------------------摩擦---------------------------------

 package springboot.datasource.config;

 import javax.sql.DataSource;

 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;

 @Configuration
 public class DataSourceConfig {

     /**
      * 主数据源
      * @return
      */
     @Bean(name = "primaryDataSource")
     @Qualifier("primaryDataSource")
     @ConfigurationProperties(prefix="spring.datasource.primary")//读取配置文件中注册数据源，对@bean不熟悉的可以看我Spring文章中一个有这篇文章
     public DataSource primaryDataSource() {
         return DataSourceBuilder.create().build();
     }
     /**
      * 子数据源
      * @return
      */
     @Bean(name = "secondaryDataSource")
     @Qualifier("secondaryDataSource")
     @Primary
     @ConfigurationProperties(prefix="spring.datasource.secondary")
     public DataSource secondaryDataSource() {
         return DataSourceBuilder.create().build();
     }

 }

剩下的部分，就是你该干嘛干嘛了，该建啥建啥。。。。。

贴下pom.xml

 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>tbnb.cn</groupId>
   <artifactId>SpringBootMuchDataSource</artifactId>
   <version>0.0.1-SNAPSHOT</version>
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>1.3.2.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>

     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>1.7</java.version>
     </properties>

     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter</artifactId>
         </dependency>

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <version>5.1.21</version>
         </dependency>

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

 </project>

　　　　　　　　-----加油！Z先生