SpringBoot对常用的数据库支持外，对NoSQL 数据库也进行了封装自动化。
这一篇主要讲springboot与mongo多数据源相关的配置

1、mongo的介绍

MongoDB是一个高性能，开源，无模式的文档型数据库，是当前NoSql数据库中比较热门的一种。它在许多场景下可用于替代传统的关系型数据库或键/值存储方式,这里不再多做说明。详细介绍参考
mongo入门

2、项目构建

添加pom文件

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

3、在application.properties中添加配置

##start mongodb for basic
#----------------------------------------------
basic.mongodb.host= 127.0.0.1
basic.mongodb.port= 27017
basic.mongodb.database= basic
#----------------------------------------------
##end mongodb for spirit

##start mongodb for basic
#----------------------------------------------
order.mongodb.host= 127.0.0.2
order.mongodb.port= 27017
order.mongodb.database= order
#----------------------------------------------
##end mongodb for spirit

4、配置相应的数据源

这里我们采用mongoTemplate这种模式去做mongo的相关操作

先写一个基础的抽象类

public abstract class AbstractMongoConfigure {

    private String host, database;
    private int port;
    /*
       * Method that creates MongoDbFactory
       * Common to both of the MongoDb connections
       */
    public MongoDbFactory mongoDbFactory() throws Exception {

        return new SimpleMongoDbFactory(new MongoClient(host, port), database);
    }

    /*
     * Factory method to create the MongoTemplate
     */
    abstract public MongoTemplate getMongoTemplate() throws Exception;

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public String getDatabase() {
        return database;
    }

    public void setDatabase(String database) {
        this.database = database;
    }

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }
}

3.1)接下来第一个库的封装

@Configuration
@EnableMongoRepositories(basePackages = {"com.sunliangliang.service.basic"}, mongoTemplateRef = "basicMongoTemplate")
@ConfigurationProperties(prefix = "basic.mongodb")
public class BasicMongoConfigure extends AbstractMongoConfigure {
    @Override
    @Bean(name = "basicMongoTemplate")
    public MongoTemplate getMongoTemplate() throws Exception {
        return new MongoTemplate(mongoDbFactory());
    }
}

其中 basePackages 的值是该库应用于相应的基础包，prefix即为相应的applications中的配置值

3.2)接下来第两个库的封装

@Configuration
@EnableMongoRepositories(basePackages = {"com.sunliangliang.service.order"}, mongoTemplateRef = "orderMongoTemplate")
@ConfigurationProperties(prefix = "order.mongodb")
public class OrderMongoConfigure extends AbstractMongoConfigure{
    @Primary
    @Override
    @Bean(name = "orderMongoTemplate")
    public MongoTemplate getMongoTemplate() throws Exception {
        return new MongoTemplate(mongoDbFactory());
    }
}

封装完成后接下来进行相应实体的配置

4、创建数据实体

public class UserInfo implements Serializable{
    private long id;
    private String username;
    private String password;
    private String nickname;
    private int age;
    private String name;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

4、添加对实体的操作

在这里我写了一个公用的接口用于基础的增删改查

public interface BaseService<T> {
    Boolean save(T entity);

    Boolean update(T entity);

    Boolean delete(Long id);

    T getById(Long id);

    List<T> listAll();

    List<T> listAll(T entity);
}

接下来接口的实现

@Service
public class UserInfoService implements BaseService<UserInfo>{
    @Autowired
    @Qualifier("basicMongoTemplate")
    private MongoTemplate mongoTemplate;
    @Override
    public Boolean save(UserInfo entity) {
        mongoTemplate.save(entity);
        return true;
    }

    @Override
    public Boolean update(UserInfo entity) {
        return null;
    }

    @Override
    public Boolean delete(Long id) {
        return null;
    }

    @Override
    public UserInfo getById(Long id) {
        return null;
    }

    @Override
    public List<UserInfo> listAll() {
        return mongoTemplate.findAll(UserInfo.class);
    }

    @Override
    public List<UserInfo> listAll(UserInfo entity) {
        return null;
    }
}

注意此处@Qualifier(“basicMongoTemplate”)中即为相应的具体实现类。

这里只写了添加和查询列表的实现，其他的查询相应的api即可

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class UserInfoServiceTest {
    @Autowired
    private UserInfoService userInfoService;
    @Test
    public void save() throws Exception {
        UserInfo userInfo = new UserInfo();
        userInfo.setAge(23);
        userInfo.setId(1000l);
        userInfo.setName("管理员");
        userInfo.setNickname("hehe");
        userInfo.setPassword("123456");
        userInfo.setUsername("admin");
        userInfoService.save(userInfo);
    }

    @Test
    public void listAll() throws Exception {
        userInfoService.listAll();
    }
}

若库不存在，会自动生成相应的库和文档
如图：

9.png
10.png

另一个order相关库的配置就不再这里写了，相应的请参考代码

github
中lessons-5