Examples of jdbm.RecordManager.fetch()

jdbm.RecordManager.fetch()
Fetches a record using standard java object serialization. @param recid the recid for the record that must be fetched. @return the object contained in the record. @throws IOException when one of the underlying I/O operations fails.


        // insert a 1500 byte record.
        byte[] data = UtilTT.makeRecord(1500, (byte) 1);
        long rowid = recman.insert(data);
        assertTrue("check data1",
               UtilTT.checkRecord((byte[]) recman.fetch(rowid), 1500, (byte) 1) );




        // delete the record
        recman.delete(rowid);

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        // insert a 0 byte record. Should have the same rowid.
        data = UtilTT.makeRecord(0, (byte) 2);
        long rowid2 = recman.insert(data);
        assertEquals("old and new rowid", rowid, rowid2);
        assertTrue("check data2",
               UtilTT.checkRecord((byte[]) recman.fetch(rowid2), 0, (byte) 2) );


        // now make the record a bit bigger
        data = UtilTT.makeRecord(10000, (byte) 3);
        recman.update(rowid, data);
        assertTrue("check data3",

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        // now make the record a bit bigger
        data = UtilTT.makeRecord(10000, (byte) 3);
        recman.update(rowid, data);
        assertTrue("check data3",
               UtilTT.checkRecord((byte[]) recman.fetch(rowid), 10000, (byte) 3) );


        // .. and again
        data = UtilTT.makeRecord(30000, (byte) 4);
        recman.update(rowid, data);
        assertTrue("check data3",

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        // .. and again
        data = UtilTT.makeRecord(30000, (byte) 4);
        recman.update(rowid, data);
        assertTrue("check data3",
               UtilTT.checkRecord((byte[]) recman.fetch(rowid), 30000, (byte) 4) );


        // close the file
        recman.close();
    }

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        // insert a 150000 byte record.
        byte[] data1 = UtilTT.makeRecord(150000, (byte) 1);
        long rowid1 = recman.insert(data1);
        assertTrue("check data1",
               UtilTT.checkRecord((byte[]) recman.fetch(rowid1), 150000, (byte) 1) );


        // rollback transaction, should revert to previous state
        recman.rollback();


        // insert same 150000 byte record.

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        // insert same 150000 byte record.
        byte[] data2 = UtilTT.makeRecord(150000, (byte) 1);
        long rowid2 = recman.insert(data2);
        assertTrue("check data2",
               UtilTT.checkRecord((byte[]) recman.fetch(rowid2), 150000, (byte) 1) );


        assertEquals("old and new rowid", rowid1, rowid2);


        recman.commit();

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        // insert a 150000 byte record.
        data1 = UtilTT.makeRecord(150000, (byte) 2);
        rowid1 = recman.insert(data1);
        assertTrue("check data1",
               UtilTT.checkRecord((byte[]) recman.fetch(rowid1), 150000, (byte) 2) );


        // rollback transaction, should revert to previous state
        recman.rollback();


        // insert same 150000 byte record.

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        // insert same 150000 byte record.
        data2 = UtilTT.makeRecord(150000, (byte) 2);
        rowid2 = recman.insert(data2);
        assertTrue("check data2",
               UtilTT.checkRecord((byte[]) recman.fetch(rowid2), 150000, (byte) 2) );


        assertEquals("old and new rowid", rowid1, rowid2);


        // close the file
        recman.close();

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    public void testNonExistingRecid() throws IOException{
      RecordManager recman = newRecordManager();
      
      Object obj = recman.fetch(6666666);
      assertTrue(obj == null);
      
      try{
        recman.update(6666666, obj);
        recman.commit();

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    RecordManager recman = new BaseRecordManager(newTestFile());
    
    byte[] data = UtilTT.makeRecord(1000000, (byte) 12);
    final long id = recman.insert(data);    
    data = (byte[]) recman.fetch(id);
    UtilTT.checkRecord(data, 1000000, (byte) 12);
    recman.commit();


    data = UtilTT.makeRecord(2000000, (byte) 13);
    recman.update(id, data);

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