Question

问题很简单：我可以在Cassandra数据库中为Spring Batch创建元数据模式吗？如果是的话我怎么能这样做？我已经读过Spring Batch需要RDBMS数据库并且不支持No-SQL数据库。这仍然是Spring Batch的限制，我最终如何覆盖该问题？

Answer 1

由于Casandra不支持密钥的简单序列，因此Spring Batch不支持将其用于作业存储库。

Answer 2

通过自定义ItemReader和ItemWriter，可以扩展Spring Batch以支持Cassandra。

阅读器：

@Override
public Company read() throws Exception, UnexpectedInputException, ParseException, NonTransientResourceException {
    final List<Company> companies = cassandraOperations.selectAll(aClass);

    log.debug("Read operations is performing, the object size is  {}", companies.size());

    if (index < companies.size()) {
        final Company company = companies.get(index);
        index++;
        return company;
    }

    return null;
}

作家：

@Override
public void write(final List<? extends Company> items) throws Exception {
    logger.debug("Write operations is performing, the size is {}" + items.size());
    if (!items.isEmpty()) {
        logger.info("Deleting in a batch performing...");
        cassandraTemplate.deleteAll(aClass);
        logger.info("Inserting in a batch performing...");
        cassandraTemplate.insert(items);
    }

    logger.debug("Items is null...");
}

@Beans：

@Bean
public ItemReader<Company> reader(final DataSource dataSource) {
    final CassandraBatchItemReader<Company> reader = new CassandraBatchItemReader<Company>(Company.class);
    return reader;
}

@Bean
public ItemWriter<Company> writer(final DataSource dataSource) {
    final CassandraBatchItemWriter<Company> writer = new CassandraBatchItemWriter<Company>(Company.class);
    return writer;
}

完整的源代码可以在Github Spring-Batch-with-Cassandra

中找到

cassandra数据库中的spring批处理元数据

2 个答案: