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POExtract and Insert concurrently into database using JdbcTemplate and BlockingQueue
 

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    <p>I am extracting thousands of rows from one database table and inserting into another database table. I don't want to load all the records into memory and then insert into the other database. </p> <p>Because of that, I am trying to use a BlockingQueue to load a the extractor results using one thread and insert into another database concurrently using another thread. I am using Spring JdbcTemplate to access my database.</p> <p>Here is my plan</p> <pre><code> public void performExtractionInsertion(JdbcTemplate inboundJdbcTemplate, JdbcTemplate outboundJdbcTemplate){ final BlockingQueue queue = new LinkedBlockingQueue&lt;Transaction&gt;(50); ExecutorService executor = Executors.newFixedThreadPool(2); final String SELECT_QUERY = "SELECT acc_number, date, type FROM transactions"; final String INSERT_QUERY = "INSERT INTO analysis(col1, col2, col3) VALUES(?,?,?)"; executor.execute(new Runnable() { @Override public void run() { queue.put(/*IMPLEMENTATION OF EXTRACTOR USING inboundJdbcTemplate*/); } }); executor.execute(new Runnable() { @Override public void run() { queue.take(/*IMPLEMENTATION OF INSERTER USING outboundJdbcTemplate*/) } }); } </code></pre> <p>Could someone give me an idea of how to implement the EXTRACTOR and INSERTER so that they use the same BlockingQueue to limit the number of rows in memory?</p> <p>Is this the right approach? Can I still use jdbcTemplate? What is the most intelligent and convenient way to do this?</p> <p>Thanks guys</p> <p>BTW, Transaction is the class of the object that is going to hold the extracted elements to be inserted.</p>
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