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PORemoving duplicate Java code
 

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  1. PORemoving duplicate Java code
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    <p>I have a class written in ~1000 lines of Java code that migrates one database over to another. It has 19 methods for each table being copied over, and 1 which load's the special JDBC driver for Filemaker.</p> <p>I'm looking at this and can't help thinking I've been really stupid here, and just let my urge to call a few methods from a onActionPerformed govern the 'design'. I trimmed out what I could, but it still looks a lot for what it's essentially doing.</p> <p>So here's the gist:</p> <pre><code>public static void companyInsert() throws SQLException{ // This loads the JDBC drivers, gets the connections, turns off auto commit and returns a createStatement() query = classname.Connect(); try { results = query.executeQuery("SELECT * from table"); // Iterate through the results and print them to standard output System.out.println("Starting Customers"); stmt = con.prepareStatement("INSERT ignore INTO table (idone, idtwo) values (?, ?)"); while (results.next()) { String fname = results.getString("field 1"); String lname = results.getString("field 2"); // System.out.println("Found user \"" + fname + " " + lname + "\""); stmt.setString(1, fname); stmt.setString(2, lname); stmt.addBatch(); } // submit the batch for execution int[] updateCounts = stmt.executeBatch(); System.out.println("Update count: " + updateCounts); con.commit(); stmt.close(); System.out.println("Completed Customers"); } catch (BatchUpdateException be) { //handle batch update exception int[] counts = be.getUpdateCounts(); for (int i = 0; i &lt; counts.length; i++) { System.out.println("Statement["+i+"] :"+counts[i]); } con.rollback(); }catch (SQLException e) { //handle SQL exception con.rollback(); } } </code></pre> <p>There's 19 of these methods, with only the sql parts changing (there are also more fields being set for other records, with some also being retrieved as dates). Hope someone has some great idea - if I could just tear out that catch section (this is always the same) then that would be enough!</p>
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    1. USWilli Mentzel
    1. USPaul Sellars
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    1. COIs this throwaway code?
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      1. USAugusto
    2. COHave you ever heard of an ORM and/or Hibernate and/or JPA? It does among others exactly that (removing the JDBC boilerplate).
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      1. USBalusC
    3. COAgree with BalusC. JPA is now a standard way to work with database in Java. I use JDBC occasionaly only for hardcore legacy sql selects. Using JPA will incredibly reduce your current code.
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      1. USjirka.pinkas
 

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