compositeitemwriter | 易学教程

Writing List of Items using JdbcBatchItemWriter

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问题 Currently i am using JpaItemWriter to write the list of objects as below which is working fine. Now i want to change the JpaItemWriter to JdbcBatchItemWriter due to performance issue. public class MyItemWriter implements ItemWriter<List<MyDomainObject>> { @Override public void write(List<? extends Lists<MyDomainObject>> items) { JpaItemWriter<MyDomainObject> writer = new JpaItemWriter<>(); for(List<MyDomainObject> o : items) { writer.write(o); } } } Suggest a sample snippets which uses the

Error with Spring batch Classifier Composite Item Writer

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问题 I have to basically produce multiple xml files for each file_id per currency ( ie. usd,zar ect) these transactions are all in 1 DB table. Do I create a composite writer for each currency and on my Item Processor I filter for each different currency that I read from the DB. or Can I use multiple steps for each currency per file_id ? I have been struggling to find a Springbatch solution around this. The filename resource will be different for each file and currency. For example I can recieve

Error with Spring batch Classifier Composite Item Writer

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Error with Spring batch Classifier Composite Item Writer

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CompositeItemWriter by using delegates insert(JdbcBatchItemWriter) into 2 tables with FK relation

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问题 I'm using spring batch with java annotation. This batch is required read file, process and insert into table. Basically I have done itemReader , itemProcessor and userItemWriter with commit-interval equal to 1. My question is: How to insert PK of User table to UserDetail table? @Bean public UserItemWriter userItemWriter() { UserItemWriter itemWriter = new UserItemWriter(); List<ItemWriter<? super UserBO>> delegates = new ArrayList<>(); delegates.add( userDelegates() ); delegates.add(

Spring Batch: How to create a Composite Item Writer?

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问题 I am using Spring Batch in Spring Boot application. The Spring Boot version is 1.3.5.RELEASE . I am trying to use CompositeItemWriter so that the list of items will first be compressed/zipped by WriterOne and then be passed to WriterTwo where they will be written in the database. Here is my writer 1: @Component public class Writer1 implements org.springframework.batch.item.ItemWriter<SimpleObject> { @Override public void write(List<? extends SimpleObject> list) throws Exception { for

How does Spring Batch CompositeItemWriter manage transaction for delegate writers?

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In the batch job step configuration, I plan to execute 2 queries in the writer, the 1st query is to update records in table A, then the 2nd query is to insert new records in table A again. So far I think CompositeItemWriter can achieve my goal above, i.e., I need to create 2 JdbcBatchItemWriters, one is for update, and the other one is for insert. My first question is if CompositeItemWriter is a fit for the requirement above? If yes, that lead to the second question about transaction. For example, if the first update is successful, and the second insert fails. Will the 1st update transaction

How does Spring Batch CompositeItemWriter manage transaction for delegate writers?

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问题 In the batch job step configuration, I plan to execute 2 queries in the writer, the 1st query is to update records in table A, then the 2nd query is to insert new records in table A again. So far I think CompositeItemWriter can achieve my goal above, i.e., I need to create 2 JdbcBatchItemWriters, one is for update, and the other one is for insert. My first question is if CompositeItemWriter is a fit for the requirement above? If yes, that lead to the second question about transaction. For