Validating Tabular Form Column Against Value From Another Table

Hi,
I am brand new to this forum, so please bear with me a little! I only have a small amount of experience writing PL/SQL, and I've never written Javascript or JQuery before. I am an Oracle DBA, and I have coding experience in C and PERL, so I do have a solid technical background. But, I need some advice on the best way to approach a problem.
I have a database application in Oracle Apex (version 4.2) with a tabular form against a table: let's say Table #1 with cols 1A, 1B, and1C. I need to ensure that the value entered into col B isn't greater than the value of a column in another table (let's say Table #2 col 2A). Conceptually, the amount of money available is in Table #2, and the rows of my tabular form are an act of spending money (like orders or invoices), so I need to make sure we don't spend more than we have. Does that make sense?
Does anyone have any advice for the best way to do this? I'm figuring the biggest issue here might be that we have to account for people entering mutliple rows in the tabular form at one time, right? So, if a person entered 3 orders/invoices, I need a total to make sure they didn't spend more than we have in Table #2.
I greatly appreciate your help!
Best Regards,
Laurie Baublitz

Hi!
You need one process of type ajax callbacks like:
DECLARE
   l_limit nubmer;
   l_number1 number := apex_application.g_x02;
   l_returnValue VARCHAR2(200);
BEGIN
   select A2 into l_limit from table2;
   if l_number1 > l_limit then
      l_returnValue := 'LIMIT IS NOT SO BIG';
      if l_returnValue is not null then
         --this will write l_returnValue to the buffer, and the ajax callback will receive this
        htp.p(l_returnValue);
      end if;
end if;
END;
Then you need one javascript on page, code is something like:
$('input[name=your column in tabular which is change]').live('change', function(){
   //if value of changed field differs from an empty string
   if($(this).val()!=''){
      //put target element in a var to reference it in the ajax success callback
      var num = $('input[name=your column in tabular with value]');
      $.post('wwv_flow.show',
             {"p_request"      : "APPLICATION_PROCESS=your ajax callback function",
              "p_flow_id"      : $v('pFlowId'),
              "p_flow_step_id" : $v('pFlowStepId'),
              "p_instance"     : $v('pInstance'),
              "x01"            : $(this).val(),
              "x02"            : $(num).val()
              function(data){
                 if(data !=''){
                 alert(data);
I can not guarante that code is 100% working, if not you need to do some changes or make an example on apex.oracle.com and provide credentials here.
Regards,
drama9346

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From two given tables, how do you fetch the values from two columns using values from one column(get values from col.A if col.A is not null and get values from col.B if col.A is null)?

Hi,
Use NVL or COALESCE:
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Returns col_a if col_a is not NULL; otherwise, it returns col_b.
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Edited by: user6715237 on 2013-4-19 下午9:29

Hi,CM,
I'm really very appreciated for your quick reply! You know, today is Saturday, it's not a day for everyone at work.
My principal requirement is as follows:
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--so it's better to implement it in UI rather than in EO.
2.it's better to implement this function with declarative way as in Frank Nimphius' blog.
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In order to get full information for the requirements of my use case, can take a check at:
How to set default value for a VO query bind variable in a jspx page?
(the end half of the thread: I have a more realworld requirement similar to the above requirement is:
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Regards
bao
Edited by: user6715237 on 2013-4-19 下午11:18
JAVE->JAVA

Column names from another table

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for eg,
Table EMP
EmpNo EmpName EmpContact EmpPhone
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The column names of this table can be configurable from some other place and its value is stored in another table like
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EmpName First name
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Now i want to fetch the values from Emp table but with column headers that are changed and have a value in Config table.
If a column name is not there in config table then the original column name should come.
As shown below
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1 xyz [email protected] 345
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Another eg, If EmpName is not changed and entered in second table , then i want to have the same name as the original EMP table has as shown below.
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Edited by: 941386 on May 30, 2013 6:20 AM

Unfortunately, I think this is a job for dynamic sql ...
Build your "query" first:
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lv_str := 'select empno,
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EmpContact as ' || (select value from config where column_name=Empcontact) || ',
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execute immediate lv_str;Not sure if there's a better way or not.
Only other way I can think of is to leverage the way UNION [ALL] works.
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[edit]
another thought is create a view over top of the table, query that view, then drop the view :P
that would work nicely - avoid the dynamic SQL. shrug
[edit]
Edited by: Greg.Spall on May 30, 2013 9:37 AM

Validating Tabular Form Column Against Value From Another Table

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