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POJava JDBC - prepared statement for bulk insertion using merge sort
 

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  1. POJava JDBC - prepared statement for bulk insertion using merge sort
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    <p>I am using JDBC prepared statement for bulk insertion. I am calling <code>ps.execute()</code> method. If it fails then i am calling a method where i am passing the list of parameters and the prepared statement. I am using <code>merge sort technique to divide the list</code> and then trying to insert the records, but not successfull. </p> <p>Here is my code;</p> <p>from executePrepareStatement method i am calling </p> <pre><code>this.executeInsertStatement(query, myCollection, 0, myCollection.size()); </code></pre> <p>// executeInsertStatement method</p> <pre><code>public void executeInsertStatement1(String query, List myCollection, int sIndx, int eIndx) throws DBException,SQLException { int startIndx = sIndx, endIndx = eIndx, mid = 0; try { try{ if(conn.isClosed()) new DataService(CoreConstants.TARGET); } catch (Exception e) { } if(startIndx &gt;= endIndx) { return; } conn.setAutoCommit(false); if (query != null) { mid = (startIndx + endIndx) / 2; ps = conn.prepareStatement(query); executeInsertStatement(query, myCollection, startIndx, mid); executeInsertStatement(query, myCollection, mid+1, endIndx); //int end_low = mid; //int start_high = mid + 1; if(mid &lt; endIndx) endIndx = mid; for (int i = 0; i &lt; endIndx; i++) { List list = (List) myCollection.get(i); int count = 1; for (int j = 0; j &lt; list.size(); j++) { if(list.get(j) instanceof Timestamp) { ps.setTimestamp(count, (Timestamp) list.get(j)); } else if(list.get(j) instanceof java.lang.Character) { ps.setString(count, String.valueOf(list.get(j))); } else { ps.setObject(count, list.get(j)); } count++; } try { ps.execute(); } catch (Exception e) { rollback(); } } } } catch (Exception e) { rollback(); } finally{ try { if (ps != null) { ps.close(); ps = null; } } catch (Exception ex) { } } } </code></pre> <p>Thanks</p>
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    1. USSrikanth Sridhar
    1. USSrikanth Sridhar
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    1. COCan you post an exception stacktrace please?
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      1. POJava JDBC - prepared statement for bulk insertion using merge sort
      1. USMark Bramnik
    2. COHave you debugged your code? I see a couple catch blocks with no code to handle the exception. This is a really bad practice which you should avoid at all cost. Can you elaborate on what you are trying to do? What exception do you get and where do you get it? Do you get a stackoverflow exception? For me it look like you call your executeInsertStatement1(...) method forever as I don't see a condition where you stop the recursion.
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      1. POJava JDBC - prepared statement for bulk insertion using merge sort
      1. USTimo Hahn
    3. COthanks for the reply, the recursion should end when startIndx >= endIndx. What I am trying to implement merge sort technique when the preparestatement fails. The mycollectionlist is a collection of list which contains the values to be inserted. I will not be knowing the position where the prepared statement execution fails, so i am trying to divide the list and trying to insert the records. say i have 1000 records and execution failed at 400. Iam passing the entire list dividing it using merge sort technique and inserting it.
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      1. POJava JDBC - prepared statement for bulk insertion using merge sort
      1. USSrikanth Sridhar
 

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