文章概要

• 简单多数据配置
• JdbcTemplate 多数据源配置
• mybatis多数据源配置
• mybatis-plus多数据源配置

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);
    }

}

其他的多数据配置请看官你自己举一反三

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