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Thread: Cannot run query without RowMapper

  1. #1
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    Default Cannot run query without RowMapper

    Hi,
    I ran to this problem while trying to use JDBCtemplate queryForList(String query) method. This should return List<Map<String, Obkect>>.
    At first my query is simple :
    select * from employee where group_id in (1)
    And it ran perfect.

    After that, I try this :
    select * from employee where group_id in (1,2,3,4,..., 124)
    And it's stuck (It stopped, no error, no exception, even if I debug, it just stopped at queryForList and cannot move down to the code below). However, as I added in to queryForList a RowMapper<Employee>, everything ran smoothly.

    So I have a question, what's wrong with mapping data retrieved manually without RowMapper ?


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    Think of me.... Mr.777's Avatar
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    Default Re: Cannot run query without RowMapper

    How do you retrieve the data from your query before applying RowMapper?
    Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.

    - Henry Ford

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    Default Re: Cannot run query without RowMapper

    I do this :

    String query = select * from employee where group_id in (1,2,3,4,..., 124);
    List<Map<String, Object>> rows = getJdbcTemplate().queryForList(query);
     
    for (Map<String, Object> row : rows) {
    			Employee empl = new Employee();
    			empl.setId(Long.parseLong(row.get("ID").toString()));
    			empl.setGroupId(Long.parseLong(row.get("GROUP_ID").toString()));
    			empl.setVisa((String) row.get("VISA"));
     
    			list.add(empl);
    		}

    and it stuck at queryForList.

    However it ran perfectly for
    query = select * from employee where group_id in (1);

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    Default Re: Cannot run query without RowMapper

    Well, i will suggest you to look at this. Spring JdbcTemplate Querying examples
    Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.

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