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Thread: how to get each value in array list MVC

  1. #1
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    Question how to get each value in array list MVC

    Hi Everyone!

    the log shows the correct values to my query in SQL Script and store it to my array list.
    But when I tried to retrieve the data in the controller, only the last value repeatedly displayed.

    My SQL Query script:
    select distinct (descr) from los_mca where status='A'

    Send back to my DAO:
    public List<RepPlanSummaryVO> getListAreas(RepPlanSummaryVO vo) {
    ....
    List<RepPlanSummaryVO> lst = new ArrayList<RepPlanSummaryVO>();

    .....
    rs = stmt.executeQuery();
    RepPlanSummaryVO areavo = new RepPlanSummaryVO();
    while (rs.next()) {
    logger.info("result: "+ rs.getString("DESCR"));
    areavo.setArea_abbv(rs.getString("DESCR"));
    lst.add(areavo);
    }
    ....

    Console logs:
    result: Antelope Valley
    result: Baldwin Park
    result: Downey
    result: Kern County
    result: Los Angeles
    result: Orange County
    result: Panorama City
    result: Riverside
    result: San Bernardino County
    result: San Diego
    result: South Bay
    result: West LA
    result: Woodland Hills

    Retrieve the "lst" in the controller:
    List<RepPlanSummaryVO> list = repByPlanSER.getListAreas(planVo);
    for(int i=0;i<list.size();i++) {
    logger.info("lstHeaderAreas " +i);
    RepPlanSummaryVO lblStr = list.get(i);
    logger.info("Areas --- " + lblStr);
    }

    Console logs:
    lstHeaderAreas 0
    Areas --- Woodland Hills
    lstHeaderAreas 1
    Areas --- Woodland Hills
    lstHeaderAreas 2
    Areas --- Woodland Hills
    lstHeaderAreas 3
    Areas --- Woodland Hills
    lstHeaderAreas 4
    Areas --- Woodland Hills
    lstHeaderAreas 5
    Areas --- Woodland Hills
    lstHeaderAreas 6
    Areas --- Woodland Hills
    lstHeaderAreas 7
    Areas --- Woodland Hills
    lstHeaderAreas 8
    Areas --- Woodland Hills
    lstHeaderAreas 9
    Areas --- Woodland Hills
    lstHeaderAreas 10
    Areas --- Woodland Hills
    lstHeaderAreas 11
    Areas --- Woodland Hills
    lstHeaderAreas 12
    Areas --- Woodland Hills

    I really can not pin point my mistake so, if someone every encounter this problem of mine, please help me. :'(

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: how to get each value in array list MVC

    It looks like the list contains multiple references to the same object that contains the last value it was set to.
    The list needs to have a new object for each value added to it. Create a new areavo for each new value.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Red face Re: how to get each value in array list MVC

    hahahahaha ... thanks for the advise!
    I found the culprit

    I should have put the areavo inside the while loop.

    rs = stmt.executeQuery();
    while (rs.next()) {
    RepPlanSummaryVO areavo = new RepPlanSummaryVO();
    logger.info("result: "+ rs.getString("DESCR"));
    areavo.setArea_abbv(rs.getString("DESCR"));
    lst.add(areavo);
    }
    Thanks Norm

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: how to get each value in array list MVC

    When posting code be sure to wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: how to get each value in array list MVC

    okay thanks noted

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