Switching Datasource with an AOP Aspect

Custom aspects are supported since 3.4.0.

1. With this approach the original annotation style still works — the DS annotation is also implemented with AOP.
2. Caution: do not use the annotation and a custom aspect on the same join point at the same time.

@Configuration
public class MyConfig {

    @Bean
    public DynamicDatasourceNamedInterceptor dsAdvice(DsProcessor dsProcessor) {
        DynamicDatasourceNamedInterceptor interceptor = new DynamicDatasourceNamedInterceptor(dsProcessor);
        Map<String, String> patternMap = new HashMap<>();
        patternMap.put("select*", "slave");
        patternMap.put("add*", "master");
        patternMap.put("update*", "master");
        patternMap.put("delete*", "master");
        interceptor.addPatternMap(patternMap);
        return interceptor;
    }

    @Bean
    public Advisor dsAdviceAdvisor(DynamicDatasourceNamedInterceptor dsAdvice) {
        AspectJExpressionPointcut pointcut = new AspectJExpressionPointcut();
        pointcut.setExpression("execution (* com.baomidou.samples.pattern..service.*.*(..))");
        return new DefaultPointcutAdvisor(pointcut, dsAdvice);
    }
}

The snippet above makes every method of every class under the com.baomidou.samples.pattern service package whose name starts with add, update or delete use the master datasource, while select uses the slave datasource.

More complex pointcut expression syntax is something you need to learn on your own.

Sample project: https://github.com/dynamic-datasource/dynamic-datasource-samples/tree/master/spring-boot-4/name-pattern-sample