目前业界操作数据库的框架一般是 Mybatis,但在很多业务场景下,我们需要在一个工程里配置多个数据源来实现业务逻辑。在SpringBoot中也可以实现多数据源并配合Mybatis框架编写xml文件来执行SQL。在SpringBoot中,配置多数据源的方式十分便捷,
下面开始上代码:
在pom.xml文件中需要添加一些依赖
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
<!-- Spring Boot Mybatis 依赖 --> < dependency > < groupId >org.mybatis.spring.boot</ groupId > < artifactId >mybatis-spring-boot-starter</ artifactId > < version >1.2.0</ version > </ dependency > <!-- MySQL 连接驱动依赖 --> < dependency > < groupId >mysql</ groupId > < artifactId >mysql-connector-java</ artifactId > < version >5.1.39</ version > </ dependency > <!-- Druid 数据连接池依赖 --> < dependency > < groupId >com.alibaba</ groupId > < artifactId >druid</ artifactId > < version >1.0.18</ version > </ dependency > |
application.properties 配置两个数据源配置
1
2
3
4
5
6
7
8
9
10
11
|
# master 数据源配置 master.datasource.url=jdbc:mysql://localhost:3306/springbootdb?useUnicode=true&characterEncoding=utf8 master.datasource.username=root master.datasource.password=xieshuai6666 master.datasource.driverClassName=com.mysql.jdbc.Driver # second 数据源配置 second.datasource.url=jdbc:mysql://localhost:3306/springbootdb_second?useUnicode=true&characterEncoding=utf8 second.datasource.username=root second.datasource.password=xieshuai6666 second.datasource.driverClassName=com.mysql.jdbc.Driver |
数据源配置
多数据源配置的时候注意,必须要有一个主数据源,即 MasterDataSourceConfig 配置
- @Primary 标志这个 Bean 如果在多个同类 Bean 候选时,该 Bean 优先被考虑。「多数据源配置的时候注意,必须要有一个主数据源,用 @Primary 标志该 Bean
- @MapperScan 扫描 Mapper 接口并容器管理,包路径精确到 master,为了和下面 cluster 数据源做到精确区分
- @Value 获取全局配置文件 application.properties 的 kv 配置,并自动装配sqlSessionFactoryRef 表示定义了 key ,表示一个唯一 SqlSessionFactory 实例
MasterDataSourceConfig的代码:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
@Configuration // 扫描 Mapper 接口并容器管理 @MapperScan (basePackages = MasterDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "masterSqlSessionFactory" ) public class MasterDataSourceConfig { // 精确到 master 目录,以便跟其他数据源隔离 static final String PACKAGE = "org.spring.springboot.dao.master" ; static final String MAPPER_LOCATION = "classpath:mapper/master/*.xml" ; @Value ( "${master.datasource.url}" ) private String url; @Value ( "${master.datasource.username}" ) private String user; @Value ( "${master.datasource.password}" ) private String password; @Value ( "${master.datasource.driverClassName}" ) private String driverClass; @Bean (name = "masterDataSource" ) @Primary public DataSource masterDataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(driverClass); dataSource.setUrl(url); dataSource.setUsername(user); dataSource.setPassword(password); return dataSource; } @Bean (name = "masterTransactionManager" ) @Primary public DataSourceTransactionManager masterTransactionManager() { return new DataSourceTransactionManager(masterDataSource()); } @Bean (name = "masterSqlSessionFactory" ) @Primary public SqlSessionFactory masterSqlSessionFactory( @Qualifier ( "masterDataSource" ) DataSource masterDataSource) throws Exception { final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean(); sessionFactory.setDataSource(masterDataSource); sessionFactory.setMapperLocations( new PathMatchingResourcePatternResolver() .getResources(MasterDataSourceConfig.MAPPER_LOCATION)); return sessionFactory.getObject(); } } |
第二个数据源SecondDataSourceConfig
的配置如下:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
@Configuration // 扫描 Mapper 接口并容器管理 @MapperScan (basePackages = ClusterDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "clusterSqlSessionFactory" ) public class ClusterDataSourceConfig { // 精确到 cluster 目录,以便跟其他数据源隔离 static final String PACKAGE = "org.spring.springboot.dao.cluster" ; static final String MAPPER_LOCATION = "classpath:mapper/cluster/*.xml" ; @Value ( "${cluster.datasource.url}" ) private String url; @Value ( "${cluster.datasource.username}" ) private String user; @Value ( "${cluster.datasource.password}" ) private String password; @Value ( "${cluster.datasource.driverClassName}" ) private String driverClass; @Bean (name = "clusterDataSource" ) public DataSource clusterDataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(driverClass); dataSource.setUrl(url); dataSource.setUsername(user); dataSource.setPassword(password); return dataSource; } @Bean (name = "clusterTransactionManager" ) public DataSourceTransactionManager clusterTransactionManager() { return new DataSourceTransactionManager(clusterDataSource()); } @Bean (name = "clusterSqlSessionFactory" ) public SqlSessionFactory clusterSqlSessionFactory( @Qualifier ( "clusterDataSource" ) DataSource clusterDataSource) throws Exception { final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean(); sessionFactory.setDataSource(clusterDataSource); sessionFactory.setMapperLocations( new PathMatchingResourcePatternResolver() .getResources(ClusterDataSourceConfig.MAPPER_LOCATION)); return sessionFactory.getObject(); } } |
到此,不同的数据源配置就已经完成,剩下的只需要将将Mybatis的xml文件和DAO层的接口写好,并在Service层注入,直接使用就行。
Service层的代码:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
|
@Service public class UserAndCityServiceImpl implements UserAndCityService{ @Autowired private UserDao userDao; @Autowired private CityDao cityDao; @Override public UserVo getUser(String userName) { UserVo userVo = userDao.selectByUserName(userName); CityVo cityVo = cityDao.selectByCityName( "北京市" ); userVo.setDescription(cityVo.getCityName()); return userVo; } } |
Mybatis的xml文件UserDao.xml和CityDao.xml的内容,就不一一展示了。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.jianshu.com/p/735852145580#