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

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

多数据源配置

增加一个Springboot的配置类

/**
* 多数据源配置
*/
@Configuration
public class DataSourceConfig {

//主数据源配置 ds1数据源
 @Primary
 @Bean(name = "ds1DataSourceProperties")
 @ConfigurationProperties(prefix = "spring.datasource.ds1")
 public DataSourceProperties ds1DataSourceProperties() {
   return new DataSourceProperties();
 }

//主数据源 ds1数据源
 @Primary
 @Bean(name = "ds1DataSource")
 public DataSource ds1DataSource(@Qualifier("ds1DataSourceProperties") DataSourceProperties dataSourceProperties) {
   return dataSourceProperties.initializeDataSourceBuilder().build();
 }

//第二个ds2数据源配置
 @Bean(name = "ds2DataSourceProperties")
 @ConfigurationProperties(prefix = "spring.datasource.ds2")
 public DataSourceProperties ds2DataSourceProperties() {
   return new DataSourceProperties();
 }

//第二个ds2数据源
 @Bean("ds2DataSource")
 public DataSource ds2DataSource(@Qualifier("ds2DataSourceProperties") DataSourceProperties dataSourceProperties) {
   return dataSourceProperties.initializeDataSourceBuilder().build();
 }
}

JdbcTemplate多数据源配置

增加一个Springboot配置类

/**
* JdbcTemplate多数据源配置
* 依赖于数据源配置
*
* @see DataSourceConfig
*/
@Configuration
public class JdbcTemplateDataSourceConfig {

//JdbcTemplate主数据源ds1数据源
 @Primary
 @Bean(name = "ds1JdbcTemplate")
 public JdbcTemplate ds1JdbcTemplate(@Qualifier("ds1DataSource") DataSource dataSource) {
   return new JdbcTemplate(dataSource);
 }

//JdbcTemplate第二个ds2数据源
 @Bean(name = "ds2JdbcTemplate")
 public JdbcTemplate ds2JdbcTemplate(@Qualifier("ds2DataSource") DataSource dataSource) {
   return new JdbcTemplate(dataSource);
 }
}

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

@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

/**
* Mybatis主数据源ds1配置
* 多数据源配置依赖数据源配置
* @see DataSourceConfig
*/
@Configuration
@MapperScan(basePackages ="com.web.ds1.**.dao", sqlSessionTemplateRef = "ds1SqlSessionTemplate")
public class MybatisPlusConfig4ds1 {

//主数据源 ds1数据源
 @Primary
 @Bean("ds1SqlSessionFactory")
 public SqlSessionFactory ds1SqlSessionFactory(@Qualifier("ds1DataSource") DataSource dataSource) throws Exception {
   MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
   sqlSessionFactory.setDataSource(dataSource);
   sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
           getResources("classpath*:com/web/ds1/**/*.xml"));
   return sqlSessionFactory.getObject();
 }

@Primary
 @Bean(name = "ds1TransactionManager")
 public DataSourceTransactionManager ds1TransactionManager(@Qualifier("ds1DataSource") DataSource dataSource) {
   return new DataSourceTransactionManager(dataSource);
 }

@Primary
 @Bean(name = "ds1SqlSessionTemplate")
 public SqlSessionTemplate ds1SqlSessionTemplate(@Qualifier("ds1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
   return new SqlSessionTemplate(sqlSessionFactory);
 }
}

/**
* Mybatis 第二个ds2数据源配置
* 多数据源配置依赖数据源配置
* @see DataSourceConfig
*/
@Configuration
@MapperScan(basePackages ="com.web.ds2.**.dao", sqlSessionTemplateRef = "ds2SqlSessionTemplate")
public class MybatisPlusConfig4ds2 {

//ds2数据源
 @Bean("ds2SqlSessionFactory")
 public SqlSessionFactory ds2SqlSessionFactory(@Qualifier("ds2DataSource") DataSource dataSource) throws Exception {
   MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
   sqlSessionFactory.setDataSource(dataSource);
   sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
       getResources("classpath*:com/web/ds2/**/*.xml"));
   return sqlSessionFactory.getObject();
 }

//事务支持
 @Bean(name = "ds2TransactionManager")
 public DataSourceTransactionManager ds2TransactionManager(@Qualifier("ds2DataSource") DataSource dataSource) {
   return new DataSourceTransactionManager(dataSource);
 }

@Bean(name = "ds2SqlSessionTemplate")
 public SqlSessionTemplate ds2SqlSessionTemplate(@Qualifier("ds2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
   return new SqlSessionTemplate(sqlSessionFactory);
 }
}

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

 @Bean("ds2SqlSessionFactory")
 public SqlSessionFactory ds2SqlSessionFactory(@Qualifier("ds2DataSource") DataSource dataSource) throws Exception {
   MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
   sqlSessionFactory.setDataSource(dataSource);
   MybatisConfiguration configuration = new MybatisConfiguration();
   configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
   configuration.setJdbcTypeForNull(JdbcType.NULL);
   sqlSessionFactory.setConfiguration(configuration);
   sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
       getResources("classpath*:com/web/ds2/**/*.xml"));
   sqlSessionFactory.setPlugins(new Interceptor[]{
       new PaginationInterceptor(),
       new PerformanceInterceptor()
//            .setFormat(true),
   });
   sqlSessionFactory.setGlobalConfig(new GlobalConfig().setBanner(false));
   return sqlSessionFactory.getObject();
 }

全部配置代码如下

/**
* Mybatis-plus ds2数据源配置
* 多数据源配置依赖数据源配置
* @see DataSourceConfig
*/
@Configuration
@MapperScan(basePackages ="com.web.ds2.**.dao", sqlSessionTemplateRef = "ds2SqlSessionTemplate")
public class MybatisPlusConfig4ds2{

//ds2数据源
 @Bean("ds2SqlSessionFactory")
 public SqlSessionFactory ds2SqlSessionFactory(@Qualifier("ds2DataSource") DataSource dataSource) throws Exception {
   MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
   sqlSessionFactory.setDataSource(dataSource);
   MybatisConfiguration configuration = new MybatisConfiguration();
   configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
   configuration.setJdbcTypeForNull(JdbcType.NULL);
   sqlSessionFactory.setConfiguration(configuration);
   sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
       getResources("classpath*:com/web/ds2/**/*.xml"));
   sqlSessionFactory.setPlugins(new Interceptor[]{
       new PaginationInterceptor(),
       new PerformanceInterceptor()
//            .setFormat(true),
   });
   sqlSessionFactory.setGlobalConfig(new GlobalConfig().setBanner(false));
   return sqlSessionFactory.getObject();
 }

@Bean(name = "ds2TransactionManager")
 public DataSourceTransactionManager ds2TransactionManager(@Qualifier("ds2DataSource") DataSource dataSource) {
   return new DataSourceTransactionManager(dataSource);
 }

@Bean(name = "ds2SqlSessionTemplate")
 public SqlSessionTemplate ds2SqlSessionTemplate(@Qualifier("ds2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
   return new SqlSessionTemplate(sqlSessionFactory);
 }
}

/**
* Mybatis-plus 主数据源ds1配置
* 多数据源配置依赖数据源配置
* @see DataSourceConfig
*/
@Configuration
@MapperScan(basePackages ="com.web.ds1.**.dao", sqlSessionTemplateRef = "ds1SqlSessionTemplate")
public class MybatisPlusConfig4ds1 {

//主数据源 ds1数据源
 @Primary
 @Bean("ds1SqlSessionFactory")
 public SqlSessionFactory ds1SqlSessionFactory(@Qualifier("ds1DataSource") DataSource dataSource) throws Exception {
   MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();
   sqlSessionFactory.setDataSource(dataSource);
   MybatisConfiguration configuration = new MybatisConfiguration();
   configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
   configuration.setJdbcTypeForNull(JdbcType.NULL);
   sqlSessionFactory.setConfiguration(configuration);
   sqlSessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().
           getResources("classpath*:com/ds1/web/ds1/**/*.xml"));
   sqlSessionFactory.setPlugins(new Interceptor[]{
       new PaginationInterceptor(),
       new PerformanceInterceptor()
//            .setFormat(true),
   });
   sqlSessionFactory.setGlobalConfig(new GlobalConfig().setBanner(false));
   return sqlSessionFactory.getObject();
 }

@Primary
 @Bean(name = "ds1TransactionManager")
 public DataSourceTransactionManager ds1TransactionManager(@Qualifier("ds1DataSource") DataSource dataSource) {
   return new DataSourceTransactionManager(dataSource);
 }

@Primary
 @Bean(name = "ds1SqlSessionTemplate")
 public SqlSessionTemplate ds1SqlSessionTemplate(@Qualifier("ds1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) {
   return new SqlSessionTemplate(sqlSessionFactory);
 }
}

来源：https://www.jianshu.com/p/dfd5ae340011