The main Moto is need to transfer the data from one data base to another date bade for that am going to write a batch program but spring batch is creating tables in both the data bases how to stop that
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I have 2 different file with different data. The file contains 10K record per day.
Ex:
Productname price date
T shirt,500,051221
Pant,1000,051221
Productname price date
T shirt,800,061221
Pant,1800,061221
I want to create final output file by checking price difference by todays and yesterdays file.
Ex:
Productname price
T shirt,300
Pant,800
By using spring batch I have to do this.
I have tried with batch configuration by creating two different step. but its only able to read the data. but unable to
do the processing. because here I need the data of both file for processing. but in my case its reading one step after another.
Could anyone help me on this with some sample code.
I would suggest to save FlatFile data into the database for yesterday's and today's date (may be two separate tables or in a same table if you can identify difference two records easily). Read this stored data using JdbcCursorItemReader or PagingItemReader and perform calculation/logic/massaging of data at the processor level and create a new FlatFile or save into DB as per convenience. OOTB Spring Batch does not provide facility to read data and perform calculation.
Suggestion - Read data from both the FlatFile keep it in cache and read from the cache and do the further processing.
I have about 20 csv files each of them representing one DB table. I tried to use Spring Batch as example to load one table and it was fine. One single job, with one single step composed by: a reader, a processor and a writer. Anyway each bean in the definition is casted to the Entity representing the table. So using this approach, I think it is not feasible to load 20 tables. Is there a way to have a generic reader (with associated mapper), processor and writer (with the corresponding list of columns)? Or is there a smarter way to load such files in the database? Thanks for the helps
I read everywhere how to read data in spring batch itemReader and write in database using itemWriter, but I wanted to just read data using spring batch then somehow I wanted to access this list of items outside the job. I need to perform remaining processing after job finished.
The reason I wanted to do this is because I need to perform a lot of validations on every item. I have to validate each item's variable xyz if it exists in list(which is not available within job). After performing a lot of processing I have to insert information in different tables using JPA. Please help me out!
We have a use case where we receive data in flat files which we load into an Oracle DB using Spring Batch. Post data load in Oracle, we have to distribute the data in form of flat files to several consumers. The data selection criteria depends on some pre-decided values in some fields of the data.
We have a design in place which generates a list which contains objects that can be passed to a Spring Batch job as job parameter to generate the flat files needed to be sent to the data consumers.
Using a Splitter component, I can put the individual objects into a channel and plug a JobLaunchingGateway to launch a batch job to generate the flat file.
Need help on how I can launch multiple batch jobs in parallel using JobLaunchingGateway so that I can generate files in parallel.
A setup is already in place to FTP the files to consumers. We do not need to worry about that.
Use an ExecutorChannel with a task executor before the JobLaunchingGateway.
I have a requirement to write multiple files using Spring Batch. The first file will be written based on the data from the database table. The second file will contain just the number of records written to the first file. How can I create the second file? I am not sure whether org.springframework.batch.item.file.MultiResourceItemWriter is an option for me as I think it will write multiple files based on the data it will write chunks of data in the multiple files. Correct me if I am wrong here.
Please do suggest some options with sample code if possible.
You have couple of options:
You can use CompositeItemWriter which calls collection of item writers in defined order so you can define one item writer which will write records based on data from DB and second will count records and write that to another file.
You can write data to a file in first step, finish whole file and save it somewhere, you can save counter of records if that is all you need to StepContext (common batch patterns and scroll to 11.8 Passing Data to Future Steps) and read in new Taskletcounter and save to new file.
If you want to go with option 1 which I think is right choice you can check this example of batch job configuration with CompositeItemWriter