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：

 1 package springboot;
 2 import org.springframework.beans.factory.annotation.Autowired;
 3 import org.springframework.beans.factory.annotation.Qualifier;
 4 import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
 5 import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
 6 import org.springframework.context.annotation.Bean;
 7 import org.springframework.context.annotation.Configuration;
 8 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
 9 import org.springframework.orm.jpa.JpaTransactionManager;
10 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
11 import org.springframework.transaction.PlatformTransactionManager;
12 import org.springframework.transaction.annotation.EnableTransactionManagement;
13 
14 import javax.persistence.EntityManager;
15 import javax.sql.DataSource;
16 import java.util.Map;
17 
18 @Configuration
19 @EnableTransactionManagement
20 @EnableJpaRepositories(
21         entityManagerFactoryRef="entityManagerFactorySecondary",
22         transactionManagerRef="transactionManagerSecondary",
23         basePackages= { "springboot.domain.s" }) //设置Repository所在位置
24 public class SecondaryConfig {
25 
26     @Autowired @Qualifier("secondaryDataSource")
27     private DataSource secondaryDataSource;
28 
29     @Bean(name = "entityManagerSecondary")
30     public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
31         return entityManagerFactorySecondary(builder).getObject().createEntityManager();
32     }
33 
34     @Bean(name = "entityManagerFactorySecondary")
35     public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary (EntityManagerFactoryBuilder builder) {
36         return builder
37                 .dataSource(secondaryDataSource)
38                 .properties(getVendorProperties(secondaryDataSource))
39                 .packages("springboot.domain.s") //设置实体类所在位置
40                 .persistenceUnit("secondaryPersistenceUnit")
41                 .build();
42     }
43 
44     @Autowired
45     private JpaProperties jpaProperties;
46 
47     private Map<String, String> getVendorProperties(DataSource dataSource) {
48         return jpaProperties.getHibernateProperties(dataSource);
49     }
50 
51     @Bean(name = "transactionManagerSecondary")
52     PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
53         return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
54     }
55 
56 }

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

 1 spring.datasource.primary.url=jdbc:mysql://localhost:3306/test1
 2 spring.datasource.primary.username=root
 3 spring.datasource.primary.password=123456
 4 spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver
 5 
 6 spring.datasource.secondary.url=jdbc:mysql://localhost:3306/test2
 7 spring.datasource.secondary.username=root
 8 spring.datasource.secondary.password=123456
 9 spring.datasource.secondary.driver-class-name=com.mysql.jdbc.Driver
10 server.port=80
11 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---------------------------------

 1 package springboot.datasource.config;
 2 
 3 import javax.sql.DataSource;
 4 
 5 import org.springframework.beans.factory.annotation.Qualifier;
 6 import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
 7 import org.springframework.boot.context.properties.ConfigurationProperties;
 8 import org.springframework.context.annotation.Bean;
 9 import org.springframework.context.annotation.Configuration;
10 import org.springframework.context.annotation.Primary;
11 
12 @Configuration
13 public class DataSourceConfig {
14 
15     
16     /**
17      * 主数据源
18      * @return
19      */
20     @Bean(name = "primaryDataSource")
21     @Qualifier("primaryDataSource")
22     @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
23     public DataSource primaryDataSource() {
24         return DataSourceBuilder.create().build();
25     }
26     /**
27      * 子数据源
28      * @return
29      */
30     @Bean(name = "secondaryDataSource")
31     @Qualifier("secondaryDataSource")
32     @Primary
33     @ConfigurationProperties(prefix="spring.datasource.secondary")
34     public DataSource secondaryDataSource() {
35         return DataSourceBuilder.create().build();
36     }
37     
38     
39 }

剩下的部分，就是你该干嘛干嘛了，该建啥建啥。。。。。

贴下pom.xml

 1 <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">
 2   <modelVersion>4.0.0</modelVersion>
 3   <groupId>tbnb.cn</groupId>
 4   <artifactId>SpringBootMuchDataSource</artifactId>
 5   <version>0.0.1-SNAPSHOT</version>
 6     <parent>
 7         <groupId>org.springframework.boot</groupId>
 8         <artifactId>spring-boot-starter-parent</artifactId>
 9         <version>1.3.2.RELEASE</version>
10         <relativePath/> <!-- lookup parent from repository -->
11     </parent>
12 
13     <properties>
14         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
15         <java.version>1.7</java.version>
16     </properties>
17 
18     <dependencies>
19         <dependency>
20             <groupId>org.springframework.boot</groupId>
21             <artifactId>spring-boot-starter</artifactId>
22         </dependency>
23 
24         <dependency>
25             <groupId>org.springframework.boot</groupId>
26             <artifactId>spring-boot-starter-test</artifactId>
27             <scope>test</scope>
28         </dependency>
29 
30         <dependency>
31             <groupId>org.springframework.boot</groupId>
32             <artifactId>spring-boot-starter-web</artifactId>
33         </dependency>
34         <dependency>
35             <groupId>mysql</groupId>
36             <artifactId>mysql-connector-java</artifactId>
37             <version>5.1.21</version>
38         </dependency>
39 
40         <dependency>
41             <groupId>org.springframework.boot</groupId>
42             <artifactId>spring-boot-starter-data-jpa</artifactId>
43         </dependency>
44     </dependencies>
45     
46     <build>
47         <plugins>
48             <plugin>
49                 <groupId>org.springframework.boot</groupId>
50                 <artifactId>spring-boot-maven-plugin</artifactId>
51             </plugin>
52         </plugins>
53     </build>
54   
55 </project>

　　　　　　　　-----加油！Z先生

梦想一定要有，万一实现了！