JTable and SQL select

Hi,
I'm displaying a record set in a JTable component. I would like to call this class from my main application with:
menuItem4.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent evt) {
              java.awt.EventQueue.invokeLater(new Runnable() {
                  public void run() {
                      new MyCalls().setVisible(true);
                                   }});}});My JTable code starts like this:
public classMyCalls extends JPanel{
   static Connection Con;
   static Statement Stmt;
   static ResultSet rs;
   static JTable myTable;
public void MyCalls (){
   myTable = new JTable(25,9);
   JScrollPane myPane = new JScrollPane(myTable,
   JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
   JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
   add(myPane);
   myTable.setPreferredScrollableViewportSize(new Dimension(700, 300));
// The code below here sets the database stuff and fills the table etcWhen I open the JTable from my main app nothing happens, but if I start it from the CommandLine (java MyCalls)it works.
Is there somethig wrong with the way I'm calling the JTable?
Thanks Charl

Hi, thanks for your reply
The getSelectedIndex() is used with JTabbedPane to deceide on which tabbedPane the actionEvent shall occur. So, when I press the insertButton and the getSelectedIndex() == 0 it will call an insert-method on one particular class:
btnInsert.addActionListener(           
new ActionListener(){               
public void actionPerformed(ActionEvent event){                   
if(tabbedPane.getSelectedIndex() == 0)
sqlCon.getTextFieldValue) ;
else if(tabbedPane.getSelectedIndex() == 1)
sqlCon.insertValueFromAnotherClass() ;
);   The first tabbedPane has the indexValue of 0. Second 1 and so on. The button class instance is created on several tabbedPane's.
Hope I made this understandable.
gmtongar

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    If we look back at the steps of a cursor we see again that the description and projection of what columns are returned by a query happens before any data is fetched back.
    Because of this, it's not possible to have the query return back a number of columns that are based on the data itself, as no data has been fetched at the point the projection is required.
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    2) The other answer is to write dynamic SQL. Because you're not going to know the number of columns, this isn't just a simple case of building up a SQL query as a string and passing it to the EXECUTE IMMEDIATE command within PL/SQL, because you won't have a suitable structure to read the results back into as those structures must have a known number of variables for each of the columns at design time, before the data is know. As such, inside PL/SQL code, you would have to use the DBMS_SQL package, just like in the code above that showed the workings of a cursor, as the columns there are referenced by position rather than name, and you have to deal with each column seperately. What you do with each column is up to you... store them in an array/collection, process them as you get them, or whatever. They key thing though with doing this is that, just like the reporting tools, you would need to process the data first to determine what your SQL projection is, before you execute the query to fetch the data in the format you want e.g.
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      v_sql varchar2(32767);
      -- cursor to find out the maximum number of projected columns required
      -- by looking at the data
      cursor cur_proj_test is
        select distinct rn
        from   proj_test
        order by rn;
    begin
      v_sql := 'select id';
      for i in cur_proj_test
      loop
        -- dynamically add to the projection for the query
        v_sql := v_sql||',max(decode(rn,'||i.rn||',nm)) as nm_'||i.rn;
      end loop;
      v_sql := v_sql||' from proj_test group by id order by id';
      dbms_output.put_line('Dynamic SQL Statement:-'||chr(10)||v_sql||chr(10)||chr(10));
      -- call our DBMS_SQL procedure to process the query with it's dynamic projection
      process_cursor(v_sql);
    end;
    SQL> exec dyn_pivot;
    Dynamic SQL Statement:-
    select id,max(decode(rn,1,nm)) as nm_1,max(decode(rn,2,nm)) as nm_2,max(decode(rn,3,nm)) as nm_3 from proj_test group by id order by id
    1 - Opening Cursor
    2 - Parsing the query
    3 - Describing the query
    3a - SQL Projection:-
    Column Name: ID                             Datatype: Number
    Column Name: NM_1                           Datatype: Varchar2
    Column Name: NM_2                           Datatype: Varchar2
    Column Name: NM_3                           Datatype: Varchar2
    4 - Binding in values
    5 - Executing the query
    6,7 and 8 Fetching Data:-
    1     ,Fred                ,Bloggs              ,Freddy
    2     ,Scott               ,Smith               ,
    3     ,Jim                 ,Jones               ,
    9 - Closing the cursor
    PL/SQL procedure successfully completed.
    ... and if more data is added ...
    SQL> insert into proj_test (id, rn, nm) values (1,4,'Fud');
    1 row created.
    SQL> exec dyn_pivot;
    Dynamic SQL Statement:-
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    1 - Opening Cursor
    2 - Parsing the query
    3 - Describing the query
    3a - SQL Projection:-
    Column Name: ID                             Datatype: Number
    Column Name: NM_1                           Datatype: Varchar2
    Column Name: NM_2                           Datatype: Varchar2
    Column Name: NM_3                           Datatype: Varchar2
    Column Name: NM_4                           Datatype: Varchar2
    4 - Binding in values
    5 - Executing the query
    6,7 and 8 Fetching Data:-
    1     ,Fred                ,Bloggs              ,Freddy              ,Fud
    2     ,Scott               ,Smith               ,                    ,
    3     ,Jim                 ,Jones               ,                    ,
    9 - Closing the cursor
    PL/SQL procedure successfully completed.
    Of course there are other methods, using dynamically generated scripts etc. (see Re: 4. How do I convert rows to columns?), but the above simply demonstrates that:-
    a) having a dynamic projection requires two passes of the data; one to dynamically generate the query and another to actually query the data,
    b) it is not a good idea in most cases as it requires code to handle the results dynamically rather than being able to simply query directly into a known structure or variables, and
    c) a simple SQL statement cannot have a dynamic projection.
    Most importantly, dynamic queries prevent validation of your queries at the time your code is compiled, so the compiler can't check that the column names are correct or the tables names, or that the actual syntax of the generated query is correct. This only happens at run-time, and depending upon the complexity of your dynamic query, some problems may only be experienced under certain conditions. In effect you are writing queries that are harder to validate and could potentially have bugs in them that would are not apparent until they get to a run time environment. Dynamic queries can also introduce the possibility of SQL injection (a potential security risk), especially if a user is supplying a string value into the query from an interface.
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    PL/SQL 101 : Understanding Ref Cursors
    PL/SQL 101 : Exception Handling

    excellent article. However there is one thing which is slightly erroneous. You don't need a type to be declared in the database to fetch the data, but you do need to declare a type;
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    type getcardapplattrval_recordtype
    Is record
    (cardappl_id ci_cardapplattrvalue.cardappl_ID%TYPE,
    tag ci_cardapplattrvalue.tag%TYPE,
    value ci_cardapplattrvalue.value%TYPE
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    Welcome to the forum.
    First read this:
    Urgency in online postings
    Secondly, it's always helpful to provide the following:
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    2. Sample data in the form of CREATE / INSERT statements.
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    4. Explanation of expected output (A.K.A. "business logic")
    5. Use \ tags for #2 and #3. See FAQ (Link on top right side) for details.
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  • APEX,PDF's, BI Publisher and SQL Query returning SQL code..

    I don't know if I should be posting this in this Forum or the BI Publisher forum, so I am posting in BOTH forums..
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    Title adjusted to allow people to know what I am talking about...
    Message was edited by:
    Tony Miller

    Tony,
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    Thanks for looking at this issue. Below find my remarks to your questions..
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  • APEX, BI Publisher and SQL Query (PL/SQL Function returning SQL Query)..

    I don't know if I should be posting this in this Forum or the BI Publisher forum, so I am posting in BOTH forums..
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    Message was edited by:
    Tony Miller

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  • Need help for SQL SELECT query to fetch XML records from Oracle tables having CLOB field

    Hello,
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    GM_DESC                                       VARCHAR2(40)
    OP_NBR               NOT NULL          NUMBER(4)    (Foreign Key)
    GM_PAYLOD_XML                          CLOB   
    DM:
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    DM_NBR                  NOT NULL         NUMBER(4)    (Primary Key)
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    DM_PAYLOD_XML                            CLOB       
    DE:
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    DE_NBR                     NOT NULL           NUMBER(4)    (Primary Key)
    DE_DESC                   NOT NULL           VARCHAR2(40)
    DM_NBR                    NOT NULL           NUMBER(4)    (Foreign Key)
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              <GM_PAYLOD_XML1'>
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              <GM_PAYLOD_XMLN'>
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              <DE_PAYLOD_XML1'>
              <DE_PAYLOD_XML2'> .......
              <DE_PAYLOD_XMLN'>
         </Record>
    <resultSet>
    Appreciate your help in this regard!

    Hi,
    A few questions :
    How's your first query supposed to give you an XML output like you show ?
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    What's the content of, for example, <OP_PAYLOD_XML1> ?
    I don't think it's a good idea to embed the node level in the tag name, it would make much sense to expose that as an attribute.
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