Java SpringBoot 动态数据源

在Spring Boot中配置动态数据源可以通过编程方式在运行时切换数据源。以下是一个简化的例子，展示了如何在Spring Boot应用程序中配置和切换动态数据源：

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
import javax.sql.DataSource;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
 
public class DynamicDataSource extends AbstractRoutingDataSource {
    private final Map<Object, Object> dynamicTargetDataSources = new ConcurrentHashMap<>();
 
    public void addDataSource(String key, DataSource dataSource) {
        this.dynamicTargetDataSources.put(key, dataSource);
        this.setTargetDataSources(dynamicTargetDataSources);
        this.afterPropertiesSet();
    }
 
    public void removeDataSource(String key) {
        this.dynamicTargetDataSources.remove(key);
        this.setTargetDataSources(dynamicTargetDataSources);
        this.afterPropertiesSet();
    }
 
    @Override
    protected Object determineCurrentLookupKey() {
        // 返回当前线程使用的数据源标识
        return DataSourceContextHolder.getDataSourceType();
    }
}
 
public class DataSourceContextHolder {
    private static final ThreadLocal<String> contextHolder = new ThreadLocal<>();
 
    public static void setDataSourceType(String dataSourceType) {
        contextHolder.set(dataSourceType);
    }
 
    public static String getDataSourceType() {
        return contextHolder.get();
    }
 
    public static void clearDataSourceType() {
        contextHolder.remove();
    }
}
 
// 在配置类中配置动态数据源
@Configuration
public class DataSourceConfig {
 
    @Bean
    public DataSource dataSource() {
        DynamicDataSource dynamicDataSource = new DynamicDataSource();
        // 配置默认数据源
        dynamicDataSource.setDefaultTargetDataSource(primaryDataSource());
        // 初始化时添加其他数据源
        dynamicDataSource.addDataSource("secondary", secondaryDataSource());
        return dynamicDataSource;
    }
 
    @Bean
    public DataSource primaryDataSource() {
        // 配置主数据源
        return ...;
    }
 
    @Bean
    public DataSource secondaryDataSource() {
        // 配置第二数据源
        return ...;
    }
 
    // 切换数据源的方法
    public void switchDataSource(String dataSourceType) {
        DataSourceContextHolder.setDataSourceType(dataSourceType);
    }
}
 
// 使用动态数据源执行操作
public class SomeService {
    @Autowired
    private JdbcTemplate jdbcTemplate;
 
    public void doSomething() {