SpringBoot多数据源配置详细教程(JdbcTemplate、mybatis)

多数据源配置

首先是配置文件

• 这里采用yml配置文件，其他类型配置文件同理
• 我配置了两个数据源，一个名字叫ds1数据源，一个名字叫ds2数据源,如果你想配置更多的数据源，继续加就行了

1. spring:
2. # 数据源配置
3. datasource:
4. ds1: #数据源1
5. driver-class-name: com.mysql.jdbc.Driver # mysql的驱动你可以配置别的关系型数据库
6. url: jdbc:mysql://ip:3306/db1 #数据源地址
7. username: root # 用户名
8. password: root # 密码
9. ds2: # 数据源2
10. driver-class-name: com.mysql.jdbc.Driver # mysql的驱动你可以配置别的关系型数据库
11. url: jdbc:mysql://ip:3307/db2#数据源地址
12. username: root # 用户名
13. password: root # 密码

多数据源配置

增加一个Springboot的配置类

1. /**
2. * 多数据源配置
3. */
4. @Configuration
5. public class DataSourceConfig {
6.  
7. //主数据源配置 ds1数据源
8. @Primary
9. @Bean(name = "ds1DataSourceProperties")
10. @ConfigurationProperties(prefix = "spring.datasource.ds1")
11. public DataSourceProperties ds1DataSourceProperties() {
12. return new DataSourceProperties();
13. }
14.  
15. //主数据源 ds1数据源
16. @Primary
17. @Bean(name = "ds1DataSource")
18. public DataSource ds1DataSource(@Qualifier("ds1DataSourceProperties") DataSourceProperties dataSourceProperties) {
19. return dataSourceProperties.initializeDataSourceBuilder().build();
20. }
21.  
22. //第二个ds2数据源配置
23. @Bean(name = "ds2DataSourceProperties")
24. @ConfigurationProperties(prefix = "spring.datasource.ds2")
25. public DataSourceProperties ds2DataSourceProperties() {
26. return new DataSourceProperties();
27. }
28.  
29. //第二个ds2数据源
30. @Bean("ds2DataSource")
31. public DataSource ds2DataSource(@Qualifier("ds2DataSourceProperties") DataSourceProperties dataSourceProperties) {
32. return dataSourceProperties.initializeDataSourceBuilder().build();
33. }
34. }

JdbcTemplate多数据源配置

增加一个Springboot配置类

1. /**
2. * JdbcTemplate多数据源配置
3. * 依赖于数据源配置
4. *
5. * @see DataSourceConfig
6. */
7. @Configuration
8. public class JdbcTemplateDataSourceConfig {
9.  
10. //JdbcTemplate主数据源ds1数据源
11. @Primary
12. @Bean(name = "ds1JdbcTemplate")
13. public JdbcTemplate ds1JdbcTemplate(@Qualifier("ds1DataSource") DataSource dataSource) {
14. return new JdbcTemplate(dataSource);
15. }
16.  
17. //JdbcTemplate第二个ds2数据源
18. @Bean(name = "ds2JdbcTemplate")
19. public JdbcTemplate ds2JdbcTemplate(@Qualifier("ds2DataSource") DataSource dataSource) {
20. return new JdbcTemplate(dataSource);
21. }
22. }

mybatis 多数据源配置

增加一个SpringBoot配置类

mybatis多数据源的原理是根据不同包，调用不同的数据源，你只需要把你的mapper.java和mapper.xml(我喜欢叫dao.java和dao.xml)写在某个package中，springboot自动帮你实现数据源切换
核心代码就这句

1. @MapperScan(basePackages ="com.web.ds2.**.dao", sqlSessionTemplateRef = "ds2SqlSessionTemplate")

用来指定包扫描指定sqlSessionTemplateRef
和sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath*:com/web/ds2/**/*.xml"));
用来指定mapper.xml的路径

详细配置代码如下

1. /**
2. * Mybatis主数据源ds1配置
3. * 多数据源配置依赖数据源配置
4. * @see DataSourceConfig
5. */
6. @Configuration
7. @MapperScan(basePackages ="com.web.ds1.**.dao", sqlSessionTemplateRef = "ds1SqlSessionTemplate")
8. public class MybatisPlusConfig4ds1 {
9.  
10. //主数据源 ds1数据源
11. @Primary
12. @Bean("ds1SqlSessionFactory")
13. public SqlSessionFactory ds1SqlSessionFactory(@Qualifier("ds1DataSource") DataSource dataSource) throws Exception {
14. MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
15. sqlSessionFactory.setDataSource(dataSource);
16. sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
17. getResources("classpath*:com/web/ds1/**/*.xml"));
18. return sqlSessionFactory.getObject();
19. }
20.  
21. @Primary
22. @Bean(name = "ds1TransactionManager")
23. public DataSourceTransactionManager ds1TransactionManager(@Qualifier("ds1DataSource") DataSource dataSource) {
24. return new DataSourceTransactionManager(dataSource);
25. }
26.  
27. @Primary
28. @Bean(name = "ds1SqlSessionTemplate")
29. public SqlSessionTemplate ds1SqlSessionTemplate(@Qualifier("ds1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
30. return new SqlSessionTemplate(sqlSessionFactory);
31. }
32. }

1. /**
2. * Mybatis 第二个ds2数据源配置
3. * 多数据源配置依赖数据源配置
4. * @see DataSourceConfig
5. */
6. @Configuration
7. @MapperScan(basePackages ="com.web.ds2.**.dao", sqlSessionTemplateRef = "ds2SqlSessionTemplate")
8. public class MybatisPlusConfig4ds2 {
9.  
10. //ds2数据源
11. @Bean("ds2SqlSessionFactory")
12. public SqlSessionFactory ds2SqlSessionFactory(@Qualifier("ds2DataSource") DataSource dataSource) throws Exception {
13. MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
14. sqlSessionFactory.setDataSource(dataSource);
15. sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
16. getResources("classpath*:com/web/ds2/**/*.xml"));
17. return sqlSessionFactory.getObject();
18. }
19.  
20. //事务支持
21. @Bean(name = "ds2TransactionManager")
22. public DataSourceTransactionManager ds2TransactionManager(@Qualifier("ds2DataSource") DataSource dataSource) {
23. return new DataSourceTransactionManager(dataSource);
24. }
25.  
26. @Bean(name = "ds2SqlSessionTemplate")
27. public SqlSessionTemplate ds2SqlSessionTemplate(@Qualifier("ds2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
28. return new SqlSessionTemplate(sqlSessionFactory);
29. }
30. }

mybatis-plus 多数据源配置

mybatis-plus是mybatis的增强版，只增加，不影响。也就是说使用mybatis-plus兼容原来所有的mybatis代码和配置。然后又做了很多增加和简化使用，具体看官网教程https://mybatis.plus/

相对于mybatis的多数据源配置就是改了下 SqlSessionFactory
核心代码就是修改mybatis为mybatis-plus，如下

1. @Bean("ds2SqlSessionFactory")
2. public SqlSessionFactory ds2SqlSessionFactory(@Qualifier("ds2DataSource") DataSource dataSource) throws Exception {
3. MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
4. sqlSessionFactory.setDataSource(dataSource);
5. MybatisConfiguration configuration = new MybatisConfiguration();
6. configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
7. configuration.setJdbcTypeForNull(JdbcType.NULL);
8. sqlSessionFactory.setConfiguration(configuration);
9. sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
10. getResources("classpath*:com/web/ds2/**/*.xml"));
11. sqlSessionFactory.setPlugins(new Interceptor[]{
12. new PaginationInterceptor(),
13. new PerformanceInterceptor()
14. // .setFormat(true),
15. });
16. sqlSessionFactory.setGlobalConfig(new GlobalConfig().setBanner(false));
17. return sqlSessionFactory.getObject();
18. }

全部配置代码如下

1. /**
2. * Mybatis-plus ds2数据源配置
3. * 多数据源配置依赖数据源配置
4. * @see DataSourceConfig
5. */
6. @Configuration
7. @MapperScan(basePackages ="com.web.ds2.**.dao", sqlSessionTemplateRef = "ds2SqlSessionTemplate")
8. public class MybatisPlusConfig4ds2{
9.  
10. //ds2数据源
11. @Bean("ds2SqlSessionFactory")
12. public SqlSessionFactory ds2SqlSessionFactory(@Qualifier("ds2DataSource") DataSource dataSource) throws Exception {
13. MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
14. sqlSessionFactory.setDataSource(dataSource);
15. MybatisConfiguration configuration = new MybatisConfiguration();
16. configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
17. configuration.setJdbcTypeForNull(JdbcType.NULL);
18. sqlSessionFactory.setConfiguration(configuration);
19. sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
20. getResources("classpath*:com/web/ds2/**/*.xml"));
21. sqlSessionFactory.setPlugins(new Interceptor[]{
22. new PaginationInterceptor(),
23. new PerformanceInterceptor()
24. // .setFormat(true),
25. });
26. sqlSessionFactory.setGlobalConfig(new GlobalConfig().setBanner(false));
27. return sqlSessionFactory.getObject();
28. }
29.  
30. @Bean(name = "ds2TransactionManager")
31. public DataSourceTransactionManager ds2TransactionManager(@Qualifier("ds2DataSource") DataSource dataSource) {
32. return new DataSourceTransactionManager(dataSource);
33. }
34.  
35. @Bean(name = "ds2SqlSessionTemplate")
36. public SqlSessionTemplate ds2SqlSessionTemplate(@Qualifier("ds2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
37. return new SqlSessionTemplate(sqlSessionFactory);
38. }
39. }

1. /**
2. * Mybatis-plus 主数据源ds1配置
3. * 多数据源配置依赖数据源配置
4. * @see DataSourceConfig
5. */
6. @Configuration
7. @MapperScan(basePackages ="com.web.ds1.**.dao", sqlSessionTemplateRef = "ds1SqlSessionTemplate")
8. public class MybatisPlusConfig4ds1 {
9.  
10. //主数据源 ds1数据源
11. @Primary
12. @Bean("ds1SqlSessionFactory")
13. public SqlSessionFactory ds1SqlSessionFactory(@Qualifier("ds1DataSource") DataSource dataSource) throws Exception {
14. MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
15. sqlSessionFactory.setDataSource(dataSource);
16. MybatisConfiguration configuration = new MybatisConfiguration();
17. configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
18. configuration.setJdbcTypeForNull(JdbcType.NULL);
19. sqlSessionFactory.setConfiguration(configuration);
20. sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
21. getResources("classpath*:com/ds1/web/ds1/**/*.xml"));
22. sqlSessionFactory.setPlugins(new Interceptor[]{
23. new PaginationInterceptor(),
24. new PerformanceInterceptor()
25. // .setFormat(true),
26. });
27. sqlSessionFactory.setGlobalConfig(new GlobalConfig().setBanner(false));
28. return sqlSessionFactory.getObject();
29. }
30.  
31. @Primary
32. @Bean(name = "ds1TransactionManager")
33. public DataSourceTransactionManager ds1TransactionManager(@Qualifier("ds1DataSource") DataSource dataSource) {
34. return new DataSourceTransactionManager(dataSource);
35. }
36.  
37. @Primary
38. @Bean(name = "ds1SqlSessionTemplate")
39. public SqlSessionTemplate ds1SqlSessionTemplate(@Qualifier("ds1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
40. return new SqlSessionTemplate(sqlSessionFactory);
41. }
42. }

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原文链接：https://www.jianshu.com/p/dfd5ae340011