Spring batch read from file and write to database from form

#Spring batch read from file and write to database from form driver

mongo, db and collection determine the MongoDB connection and what collection to write to.

If you want to use another representation of your data in the item processor, you can write a custom converter вЂ¦ These objects are basically ordered hashmaps.

#Spring batch read from file and write to database from form driver

sort, batchSize, limit, skip and snapshot are parameters of the cursor that is used to iterate over the result set.Д«y default, the item reader emits DBObject instances that come from the MongoDB driver API.If you donвЂ™t set a query string, all documents from the collection are read. The first one is the query itself, the second one selects the field to read. query and keys are making up the MongoDB query.These parameters are required, all other are optional. mongo, db and collection determine the MongoDB connection and what collection to read from.It was merely a matter of passing parameters to the underlying MongoDB driver API. Implementing the item reader was straightforward.

Since I am a big fan of MongoDB on the one hand and introducing the Spring Batch framework at one of my customers on the other hand, why not implement a Spring Batch item reader and writer for MongoDB and publish it on github so that everybody can use it: /ttrelle/spring-batch-mongodb-support. MongoDB is optimized for heavy write throughput and horizontal scaling. It stores so called documents (basically an ordered set of key/value pairs where a value can be a simple data type like String or integer but also an array of values or a sub document). If the resource of your choice is not supported of of the box, it is easy to implement your own reader and writer as we will see in a minute. There are a lot of existing item readers and writers for a wide range of resources like JDBC databases, JMS messaging systems, flat file etc. An important aspect of Spring Batch is the separation between reading from and writing to resources and the processing of a single record, called item in the Spring Batch lingo. Spring Batch is a Spring-based framework for enterprise Java batch processing. #springbatch #mongodb #nosql Spring Batch