I have a table called Employees with Employee_id and Employee_Name columns. Now i want to create a page with Checkbox in-front of every Employee Name, select the ones that are needed, store them into a temporary table and use them for further operations. The problem i am facing is to how to create that multi select list and store the select values in thee table. Is there an Item for multi select? If not, how should i do it?
There's the Shuttle item. On the left side, you'd display list of all employees. Item buttons allow you to move all (or only some of them) to the right side of the item. Once you submit the page, list of employee IDs is stored into a table column in a form of colon-separated values, for example
6547:8879:5587:9987
This is a simple way of doing that. However, once you have to actually do something with those values, you have to split them to rows. Not a problem, though. Here's a query:
SQL> with emps (shuttle_item) as
2 (select '6547:8879:5587:9987' from dual)
3 select regexp_substr(shuttle_item, '[^:]+', 1, level) one_item
4 from emps
5 connect by level <= regexp_count(shuttle_item, ':') + 1;
ONE_ITEM
---------------------------------------------------------------------
6547
8879
5587
9987
SQL>
Or, you could create a tabular form which also displays all employees and has checkboxes at the beginning of every line. You'd then create a process which - in a loop - stores selected values into a temporary table you mentioned. For example:
-- F01 = row selector. If you check 1st and 3rd row, f01.count = 2 (2 rows checked)
-- f01(1) = 1 (row #1), f01(2) = 3 (row #3)
-- F02 = EMP_ID. f02(1) = EMP_ID that belongs to employee in 1st row,
-- f02(3) = EMP_ID that belongs to emplyee in 3rd row
declare
l_id number;
begin
for j in 1 .. apex_application.g_f01.count
loop
l_id := apex_application.g_f02(apex_application.g_f01(j));
insert into temp_table (emp_id) values (l_id);
end loop;
end;
There is an option for creating multi select list in oracle apex 5.1.
Create a pageItem of type: 'select list'.
Make the 'Allow multi
selection' to 'Yes'.
Write the SQL query for your select list under
the 'List of Values' attribute.
Then the select list will be
displayed based on our query.
Query format is:
select [displayValue],
[returnValue]
from ...
where ...
order by ...
Now once you select multiple value from select list(using ctrl+click), these are stored as ':' separated values in the select list page item.
I've created a video some times ago that covers your problem. It's a step by step tutorial how to create checkboxes and process them.
Video is available here:
https://www.youtube.com/watch?v=T-LXRMWQbPk
Regards
If the list is too big, I recommend to use the Popup LOV item with the Multiple Values switch activated instead the Select list or the Shuttle, because it has an internal search field for the objects list, doing way easier for the user to find the target values. Also, just as the Select List or Shuttle item, you can set a Separator character for the selected fields.
Related
My requirement is that users must be able to select from a shuttle page item the employee numbers that they need to delete from a table. In the back end I have a plsql code that is supposed to delete the selected employee numbers as follows:
BEGIN
delete from employees where empno in (:P7_EMPLOYEE_NUMBER);
END;
Additionally I will have more logic in the code to do other stuff, however I am not able to delete multiple rows, if I select 1 employee number in the shuttle item, I am able to delete the record successfully, when I try to delete more than one record I keep getting the following error:
Ajax call returned server error ORA-01722: invalid number for Execute Server-Side Code
I changed the code to:
BEGIN
delete from employees where empno in (to_number(:P7_EMPLOYEE_NUMBER));
END;
and I keep getting the same error message.
How can I make this work?
The API APEX_STRING has a number of utility functions to deal with multi-value page items (select lists, checkbox, shuttles). To convert a colon separated list to an array, use APEX_STRING.SPLIT.
DELETE
FROM
employees
WHERE empno IN
(SELECT column_value
FROM table(apex_string.split(: P7_EMPLOYEE_NUMBER,':'))
);
A shuttle item contains colon-separated values, which means that you have to split it to rows, e.g.
delete from employees
where empno in (select regexp_substr(:P7_EMPLOYEE_NUMBER, '[^:]+', 1, level)
from dual
connect by level <= regexp_count(:P7_EMPLOYEE_NUMBER, ':') + 1
);
The APEX engine will always submit multi-values items as a single colon-delimited string, for example: 1:2:3:4
You need to split the string into multiple values so that you can process them.
There are multiple ways to do this:
Using an the APEX_STRING.SPLIT or the APEX_STRING.SPLIT_NUMBERS API in a subquery
delete from employees
where empno in (select column_value
from apex_string.split_numbers(:P7_EMPLOYEE_NUMBER, ':'));
Using the APEX_STRING API with the MEMBER OF function
delete from employees
where empno member of apex_string.split_numbers(:P7_EMPLOYEE_NUMBER, ':');
Note that the member of needs to have the same type. In this case empno is a number so you must use the split_numbers API.
Using a regular expression to split the values
delete from employees
where empno in (select regexp_substr(:P7_EMPLOYEE_NUMBER, '[^:]+', 1, level)
from dual
connect by level <= regexp_count(:P7_EMPLOYEE_NUMBER, ':') + 1
);
I prefer using option 2 as it's less code and easier to read.
As the question states, I'm trying to save calculated data, that is the result of a select statement, to another table. In this Image, the column with green outline is a database column and the columns with red outline are calculated based on that column, I want to save the Red outlined columns to another table where the column names would be same.
This looks like a classic report. Is it? If so, it is result of a select statement. As it calculates all values you're interested in, you'd use it in an insert statement. For example, you could create a button and create a process that fires when that button is pressed. It would then
insert into target_table (emp_id, salary, house_rent, ...)
select emp_id, ... whatever you select in report's query
from ...
However: data changes. What will you do when something - that is used to calculate those values - is changed? Will you delete those rows and insert new ones? Update existing values? Add yet another row?
If you'd update existing values, consider using merge as it is capable of inserting rows (in when not matched clause, in your case) , as well as updating rows (in when matched). That would look like this:
merge into target_table t
using (select emp_id, ... whatever you select in report's query
from ...
) x
on (t.emp_id = x.emp_id)
when matched then update set
t.salary = x.salary,
t.house_rent = x.house_rent,
...
when not matched then insert (emp_id, salary, house_rent, ...)
values (x.emp_id, x.salary, x.house_rent, ...);
You can use the INSERT INTO SELECT statement - plenty of examples available on google
INSERT INTO another_table (
emp_id,
col1,
col2
)
SELECT emp_id,
calculated_col1,
calculated_col2
FROM first_table
I am working on Oracle APEX 5 and wanted to transfer values added into List manager (in page 2) to display them on Page 3 as read-only. How can we do that?
What type of item to choose to display values in page 3? and how to get these values from list manager?
please help.Thanks in advance.
The List Manager item type can hold multiple values, which are delimited by a colon e.g. '7782:7902:7788:7698'. If you pass this item value to a hidden item in the target page then you can call apex_string.split to convert it to an array of values, which you can then process as you wish. For example, if the values are EMPNOs and you want to display all the names in a display only item you can write code like:
declare
empno_array wwv_flow_t_varchar2;
begin
empno_array := apex_string.split (:P3_HIDDEN_ITEM, ':');
select listagg (ename, ', ') within group (order by ename)
into :P3_DISPLAY_ITEM
from emp
where empno in (select column_value
from table(empno_array));
end;
I have a source table, and a history table. They are identical, except the history table has a notes column as the last column.
The table is large, 55 columns, which I do not want to list all the columns. We do not want to use a trigger on this, but just create the history entry in the code itself.
If I simply do an INSERT INTO <history> SELECT * FROM <source> WHERE...... I will get "not enough values".
I'm hoping to do something of this nature: (Note this is just an anonymous block)
DECLARE
v_old_rec company_table%ROWTYPE;
BEGIN
SELECT * INTO v_old_rec
FROM company_table
WHERE company_id = 32789;
INSERT INTO company_table_hist
VALUES v_old_rec || ',MONTHLY UPDATE';
END;
Anything like this possible, so I do not have to list 55 columns?
Thank you.
It's quite simple actually:
INSERT INTO company_table_hist
(SELECT t.*, MONTHLY_UPD
FROM company_table t
WHERE company_id = 32789);
Of course monthly_upd must be bound somehow
I have to create a trigger for a table with many columns and I want to now if is any possibility to avoid using the name of the column after :new and :old. Instead of specifically use the column name I want to use the element from collection with column names of target table (the table on which the trigger is set).
The line 25 is that with the binding error:
DBMS_OUTPUT.PUT_LINE('Updating customer id'||col_name(i)||to_char(:new.col_name(i)));
Bellow you can see my trigger:
CREATE OR REPLACE TRIGGER TEST_TRG BEFORE
INSERT OR
UPDATE ON ITEMS REFERENCING OLD AS OLD NEW AS NEW FOR EACH ROW DECLARE TYPE col_list IS TABLE OF VARCHAR2(60);
col_name col_list := col_list();
total INTEGER;
counter INTEGER :=0;
BEGIN
SELECT COUNT(*)
INTO total
FROM user_tab_columns
WHERE table_name = 'ITEMS';
FOR rec IN
(SELECT column_name FROM user_tab_columns WHERE table_name = 'ITEMS'
)
LOOP
col_name.extend;
counter :=counter+1;
col_name(counter) := rec.column_name;
dbms_output.put_line(col_name(counter));
END LOOP;
dbms_output.put_line(TO_CHAR(total));
FOR i IN 1 .. col_name.count
LOOP
IF UPDATING(col_name(i)) THEN
DBMS_OUTPUT.PUT_LINE('Updating customer id'||col_name(i)||to_char(:new.col_name(i)));
END IF;
END LOOP;
END;
Sincerely,
After digging more I have found that is not possible to dynamically reference the :new.column_name or :old.column_name values in a trigger. Due to this I will use my code only to INSERT (it does not have an old value :-() and I will do some code in java to generate UPDATE statements.
I must refine my previous answer based on what has been said by Justin Cave and also my findings. We can create a dynamic list of values triggered by INSERTING and UPDATING, based on referencing clause (old and new). For example I have created 2 collections of type nested table with varchars. One collection will contain all column tabs, as strings, that I will use for auditing and another collection will contains values for that columns with binding reference (ex. :new.). After INSERTING predicate I have created a index by collection (an associative array) of strings with ID taken from list of strings with column tab name and the value taken from the list of values for that columns referenced by new. Due to the index by collection you have a full working dynamic list at your disposal. Good luck :-)