1. Spring Batch Read From File And Write To Database From Format
2. Python Create File And Write To It

I'm new to Spring Batch and trying to implement a batch job where I

Using Spring Batch Flat file reader to read CSV file and Jdbc Batch Item Writer to write MySQL Database. In this tutorial, we show you how to read information from a CSV file and write to MySQL Database using Spring Batch Boot and Spring tools Eclipse. Using Spring Batch Flat file reader to read CSV file and Jdbc Batch Item Writer to write. Spring Batch Boot to read from MySQL database using JdbcCursorItemReader and write to a Flat file using FlatFileItemWriter. In this tutorial, we show you how to configure Spring Batch Boot Job to read information from a CSV file and write to MySQL Database using Eclipse Oxygen Java. Spring Batch Boot to read from MySQL database using. A typical batch program generally reads a large number of records from a database, file, or queue, processes the data in some fashion, and then writes back data in a modified form to database,file-system, mailer etc.

1. Read from a MySQL database
2. Write the results to a CSV file
3. Do some processing of MySQL result set and write to another database.

I've looked through this question on StackOverflow, but the main accepted answer was essentially to implement two steps that read twice from the database:

Isn't there a more efficient way of doing this than reading twice from the MySQL database? For example, what if you query is quite large and drags system performance?

2 Answers

What you need is a chunk strategy instead of tasklet. The ItemReader will read chunks from your database, the processor will process you data and then you can for each item send them to the ItemWriter that can write to database and file. This is one of many possible strategies, I don't know the details on your business logic, but I think this is information enough to get you going on your own ideas.

This is the JSR-352 XML type, for Spring you have corresponding approach.

I'll go ahead and answer my own question. There's multiple ways to do this, but I found that saving properties and objects first to the StepExecutionContext, then promoting them to the JobExecutionContext after the Step completes works well. It is also documented pretty thoroughly here.

Step 1:

In your Writer / Reader declare a private StepExecution. Then, inside your read/write method create the step context, and put your data in as a key/value pair:

Step 2: Add an ExecutionContextPromotionListener to your step's bean configuration. The ExecutionContextPromotionListener must include a String[] property called Keys that includes the keys you wish to promote to Job scope beyond your step, similar to this implementation from a LinkedIn article:

Step 3: You also need to add the StepExecution into your Writer before your step executes:

Step 4: This will give your write() method access to the stepExecution instance, where it can access stepContext for you to save your data. For instance, you can write

Finally, in your next step, you can retrieve this data (example coming directly from the Spring Batch documentation:

This time, however, notice that it's being accessed from the jobContext as opposed to the stepContext- it's been promoted!

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I am new to Spring batch and trying to write multiple XML files for each record that I am going to read from database table. Suppose if I read 10 records, I need to create 10 XML files. One for each record.The name for each XML file should be unique. For that, I am planning to use 'column_name1' value but I am not sure how to achieve that. If anyone can help me in this then that would be a great help.

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Spring Batch Read From File And Write To Database From Format

Added the #{formsPMVRowMapper.id} to resource property which can point to DefaultOutboundIFMRowMapper(Custom implementation of RowMapper) where I created a class level variable to set the row id. but still it's not working since it tries to call getter of ID even before getting into mapRow method which I think correct behviour but I am not sure how to get hold of that ID which I can use as resource name for my file in multiXmlFileItemWriter. Could someone please let me know what could be the possibly correct way to do this?

Below is my Spring batch configuration file.

I understand that above 'resource' property can only write files with same name but I am not sure how to use 'resource' property well in co-ordination with 'resourceSuffixCreator' property.

Python Create File And Write To It

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