Deleting a single row from a dataTable / database
Hi,
I am fairly new to JSF so please bear with me if the answer is obvious :D. I'm using a dataTable component to display data from a database and would like to add a commandLink component to every row in the table that deletes that row from the database. What is the most effective way of doing this?
I'm thinking of using a ListDataModel with some function that removes the correct row (though I'm not sure how it will tie in with a commandLink and exactly where the database will be updated). I'll appreciate any pointers or perhaps even an online example of something similar.
Alternatively I suppose you could pass an "id" parameter on with the commandLink that somehow gets read in the request and the appropriate row is removed accordingly. This solution seems cumbersome however.
jabalsad wrote:
Hi,
I am fairly new to JSF so please bear with me if the answer is obvious :D. I'm using a dataTable component to display data from a database and would like to add a commandLink component to every row in the table that deletes that row from the database. What is the most effective way of doing this?
I'm thinking of using a ListDataModel with some function that removes the correct row (though I'm not sure how it will tie in with a commandLink and exactly where the database will be updated). I'll appreciate any pointers or perhaps even an online example of something similar.
Alternatively I suppose you could pass an "id" parameter on with the commandLink that somehow gets read in the request and the appropriate row is removed accordingly. This solution seems cumbersome however.Yes, your instincts are correct there. Binding the data model to a backing bean to get the UIData instance for the table. Then use UIData.getRowData() to get the object corresponding to the row containing the link/button. Then execute your business logic to delete the row from the database. Then you need to ensure the data model is updated to reflect the new state of the database.
Similar Messages
-
Deleting single row from Special Price for Business Partners
Hi Experts,
How would I go about about deleting a single row from Special Prices for Business Partners across all BPs when for most of my BPs this is the only special price they have. I have tried using Copy Discounts function but once you are down to 0 rows the record has effectively gone from the table so there is nothing to copy.
Hopefully I won't have to go thorugh 5000 records and delete each one idividually.
Thanks
JonHi Jon,
You may try a tool called B1TCH:
/people/community.user/blog/2007/08/19/get-your-kicks-with-di-commander
Thanks,
Gordon -
Hi Experts,
I want to delete a single row from DBTAB ( KLAH )
WHERE KLAHKLART = '2' and KLAHCLINT = '241'.
Please advice
KarthikHi ,
Try this code To delete single record from DB table- -
DATA : t_klah LIKE TABLE OF klah,
fs_klah LIKE klah.
SELECT * FROM klah INTO TABLE t_klah
WHERE klart = '2' AND
clint = '241'.
LOOP AT t_klah INTO fs_klah.
DELETE klah FROM fs_klah .
EXIT.
ENDLOOP.
Regards
Pinaki -
How to delete a single data from table using control file
I want delete a single row data from table using sql loder control file
Edited by: 977940 on Dec 19, 2012 9:00 PM977940 wrote:
I want delete a single row data from table using sql loder control file
Edited by: 977940 on Dec 19, 2012 9:00 PMWhy?
And how do you imagine this happening with sqlloader?
The entire purpose of sqlloader is to load data (hence, the name sql*loader*) into a table from an external source. If you want to delete rows from a table, you use the sql DELETE statement.
What is the business problem you are trying to solve? -
Retrieve a single row from Oracle function
Hi!
I have an Oracle function created as follow:
CREATE OR REPLACE FUNCTION user_data(userId IN users.user_id%TYPE)
RETURN users%ROWTYPE AS
userData users%ROWTYPE;
BEGIN
SELECT * INTO userData
FROM users
WHERE user_id = userId;
RETURN userData;
END user_data;
This function returns a single row from 'users' table.
I tried to retrieve that single row by mean of:
CallableStatement statement = connection
prepareCall("{ call ? := get_data(?) }");
statement.*registerOutParameter(1, OracleTypes.OTHER)*;
statement.setInt(2, 103);
statement.execute();
ResultSet rs = (ResultSet) statement.getObject(1);*
String value = rs.getString(2);
System.out.println(value);
But this code doesn't work.
I tried other OracleTypes, also. (I don't know what OracleType I receive when the Oracle function return a ROWTYPE.)
Can somebody tell me how to retrieve that single row?
What is the type of out parameter (registerOutParameter()) when the Oracle function return a ROWTYPE?
Notes: No cursor can be added. No database change is allowed.
Thank you in advance.
[Adrián E. Córdoba]
Edited by: aecordoba on Mar 18, 2011 3:58 PMaecordoba wrote:
I beg your pardon for my bad English. (It isn't my original language.)
It's not a language problem. It's that you didn't provide any details about what went wrong.
That just is my problem:
I know the retrieved result is not a result set: It's a single row.Doesn't matter if it's a single row. You have a ResultSet object. You have to call ResultSet's next() method to get to the first row, even if it's the only row.
1- Which is the Oracle type I receive in Java when the Oracle function returns a ROWTYPE?I don't know.
2- How can I get each column value when I receive a single row in Java?The same way as when there are multiple rows: For each row, call ResultSet.next() to advance to the next row, then call the appropriate ResultSet.getXxx() methods to get each column's value. Again: If you have a ResultSet, you must call next() to get to the first row, even if there is only one row. "First row out of 1 total row" is no different than "first row out of 100 total rows."
EDIT: Okay, I didn't notice before that you're using a CallableStatement with "out" parameters. I've never used one of those before, so I'm not familiar with the details. I really don't know if casting to a ResultSet is appropriate here. Do you actually have documentation that says you can do that, or are you just guessing and trying to find something that works.
Edited by: jverd on Mar 18, 2011 11:26 AM -
How to delete a single request from DSO in BI 7.0
Dear Experts,
Could you please tell me how to delete a single request from DSO?
I mean, in DSO if we delete one request it also delete the requests which are above it. But i don't to delete the above it.
Please suggest me this issue.
Regards,
PrathapIN DSO--its a very basic thing....
ACTIVE TABLE and CHANGELOG tables are overwritten after activation of each request.
So ,each new request has a realationsip with the older request.
So in the cases:
1.If you activate the older request it will delete the new one ,because changelog entries have been written from the data of new request on the basis of the older one.
e.g older request entries:
a x 1
new request
a x 2
change log
a x 1
a x -1
a x 2
so its quite obvious you can't have a x 2 directly (because in the infocube you will be sending wrong entries by deleting the just the older request and loadning new request).
2.If you have activate new and old request toghterh then also system will not allow you to delete the newer request alone and you will have to delete both the requests.
I guess already someone proposed correct solution to you ...thats selective deletion...but rahter than doing selective deletion there is a better way if you want to cancel out a particular request:
thats request reverst posting
IN the process monitor of any particular request you can find out the option for request reverse posting..Its good for individual request cancellation(keyfig values will become 0 for that particular request)
regards,
rk -
How can I delete a single song from my iPad?
How can I delete a single song from my iPad?
Hi lizdance40,
The first part of your answer worked great, thanks for that! However, since doing that, there are still songs on the iPad that I want to delete. I place my finger on the song, swipe to the left....and nothing. No red "delete" appears at the right. That used to work on my full size iPad, but not on this mini. I just purchased it last Friday...maybe it's defective?
Thanks again,
Sirsheila -
Deleting a single field from existing Layout - Update
Hi,
We need to amend our custom integrator's layout by removing a field from the layout.
However, in Desktop Integration - "Define Layout" - we do not have any option to delete a field (options are - Move Up/down, Read only, width,Frozen pane)
(Making width - 0 is not solving the purpose since only the field is not visible in layout but mappings remain as is)
Is there any option to remove a single field from integrator layout?
Thanks much in advance,
Rgds,
SumanthDuplicate post - Deleting a single field from existing Layout - Update
Srini -
Deleting a single field from existing WebADI Layout (Update)
Hi,
We need to amend our custom WebADI integrator's layout by removing a field from the layout.
However, in Desktop Integration - "Define Layout" - we do not have any option to delete a field (options are - Move Up/down, Read only, width,Frozen pane)
(Making width - 0 is not solving the purpose since only the field is not visible in layout but mappings remain as is)
Is there any option to remove a single field from integrator layout?
Thanks much in advance,
Rgds,
SumanthDuplicate post - Deleting a single field from existing Layout - Update
Srini -
Deleting a single item from the trash.
Hello
Is there a way to delete a single item from the trash, while leaving all other items in the trash?I don't believe so and I'm not sure why you would want to.
Items should not be placed in the Trash unless you intend to delete the items. The Trash is not designed for and should not be used as a temporary storage location. -
How to update single row of ms access database
Hi All,
can somebody tell me how can i edit/update a single row of ms access database?
let say i want to edit the first row of the figure in the left. What i want is when i click in the row, it will pop up a window where i can edit the fields content. or may be is it possible to add a column with "edit" text which link to the appropriate row. so when i click the "edit" it will open the edit window.
Thank youIf you use a multi-column listbox indicator there is a "double-click" event that you can capture with an event structure. The event, when fired, returns the row that the user double-clicked. Use that parameter to fetch/modify the data as needed. Remember that to update the data in the database the table containing the data must have a primary key - or at lease something you can use to uniquely identify the rows.
Remember that in a database, there is no such thing as "the first row"; you have to explicitly identify which row you wish to modify.
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps -
I want to delete a single contact from history.
Hi!! I want to delete a single contact from history. I have read that few users have asked similar questions in the past as well and also I have found some of them answering or rather questioning why one will like to delete a single log from the history. ???
The answer is simple. For me, I may not want my friends/parents or any other know whom I was talking with. This feature is very much there in Nokia and it is very usefull as well.
So in case, any body find the solution, please reply.In the present iOS, it's all or nothing. You can suggest Apple add the ability to edit the call history log here:
http://www.apple.com/feedback/iphone.html -
Single row from this query without create a group by
Can I have a single row from this query without create a group by on tipo (TIPO can have only 2 value (A,D)
SELECT
CASE TIPO
WHEN 'D' THEN SUM(IMPORTO) ELSE 0 END DIMPORTO,
CASE TIPO
WHEN 'A' THEN SUM(IMPORTO) ELSE 0 END AIMPORTO
FROM MGIORNALE
WHERE K_CONTO = '100001' --CONTO
AND DECODE(T_MOVIM,'MRAP',TO_DATE('31/12/'||to_char(a_competenza),'DD/MM/YYYY'),DATA_RG)
-- BETWEEN DATAA AND DATAB
BETWEEN '01/01/2006' AND '31/12/2006'
--GROUP BY TIPO
--AND TIPO = COL_conto
Thanks in advanceIs like this?
sum (CASE TIPO
WHEN 'D' THEN IMPORTO ELSE 0 END) DIMPORTO, -
I am having trouble with a query, I need a single row from a 1-to-many relationship that is prioritized by certain ID's.
Department Table - dept_id,dept_name
Employee Table - emp_id, emp_name
D-E-Lookup Table - dept_id,emp_id
Employee ID priority are 5,8,9,21,33,78
I need each department name with the associated employee name.
There should be only one row per department.
If that department does not have empID 5, than 8, if not 8 then 9, if not 9 than 21, etc
Any help would be greatly appreciated.How about this:
WITH departments AS
( SELECT ROWNUM AS deptno, COLUMN_VALUE AS dname
FROM TABLE(sys.dbms_debug_vc2coll('Sales','IT','Research')) )
, employees AS
( SELECT ROWNUM AS empno, COLUMN_VALUE AS ename
FROM TABLE(sys.dbms_debug_vc2coll('Bennett','Parkman','Nakamura')) )
, department_assignments AS
( SELECT 1 AS deptno, 1 AS empno, 5 AS priority FROM dual UNION ALL
SELECT 1 AS deptno, 2 AS empno, 8 AS priority FROM dual UNION ALL
SELECT 1 AS deptno, 3 AS empno, 9 AS priority FROM dual UNION ALL
SELECT 2 AS deptno, 2 AS empno, 8 AS priority FROM dual UNION ALL
SELECT 2 AS deptno, 3 AS empno, 9 AS priority FROM dual UNION ALL
SELECT 3 AS deptno, 1 AS empno, 9 AS priority FROM dual UNION ALL
SELECT 3 AS deptno, 3 AS empno, 21 AS priority FROM dual )
SELECT dname, ename, priority
FROM ( SELECT d.dname
, e.ename
, dp.priority
, DENSE_RANK() OVER (PARTITION BY d.deptno ORDER BY dp.priority) AS ranking
FROM departments d
LEFT JOIN department_assignments dp ON dp.deptno = d.deptno
LEFT JOIN employees e ON e.empno = dp.empno )
WHERE ranking = 1;
DNAME ENAME PRIORITY
Sales Bennett 5
IT Parkman 8
Research Bennett 9
3 rows selectedThe <tt>WITH</tt> clause is just to define test data inline rather than creating tables, in case that's not clear. -
Select a single row from a billion row table
This is a fictitious scenario, how would you write a select statement on a table with a billion rows. It never returns anything,right? Somebody was suggesting a stored procedure.
As an example : Assuming a Table with columns Account(int), TransDate(DateTime), TransNum(int) and few other columns. I need a transaction that happened on 03-05-2014 8:15PM. Clustered index on Account. Non- clustered on TransDate.
I was suggested to create a stored procedure, inside the SP you have 3 parameters: min_date, max_date, avg= min_date+max_date/2. You create a loop and feed the avg value to the max_date or min_date depending on where the row is. This is a suggestion
that I am not clear my-self but wanted to see if you guys can help me develop this idea.
Also please suggest how you would do it in your world. You guys could have much better ideas probably much simpler one's. Thanks in advance.
svkI basically just need transaction for one particular datetime. Not any span. One of our senior developers suggested that a simple select statement takes for ever to return a single row from a billion rows and suggested a vague idea as above.
Either there is a suitable index on the column, and the SELECT will be fast.
Or there is no index on the column, and in that case it will take quite some time to find the row. The only reason to loop is that you don't want to take out a table lock, but in that case you would do something like looping one account at a time. Looping
over different time values will only mean that you will scan the table multiple times.
Erland Sommarskog, SQL Server MVP, [email protected]
Maybe you are looking for
-
The message I receive is "The version of this file is not compatible with the version of Windows you're running. Check your computer's system info to see whether you need an x86 (32-bit) or x64 (64 bit) version of the program, and the contact the sof
-
Hi, The scenario is there is an sales invoice of 5000 and i want to settle that ,but customer has paid me 10000 and want to adjust 5000 against the invoice and another 5000 as advance .how it can be done thanks & regards, Santosh kumar
-
Using CopyIntoItems from Copy.asmx from a remote soap client
Hello, I have been working on a soap client that runs on a remote client (not on the SharePoint server) and is platform-independent so that it cannot use the SP Object Model. I have managed to get most of the functionality working using SharePoint we
-
Timecard details in approval notification
Hi All, My query is related to entering timecard in OTL for projects. I am entering time against 2 projects in a timecard and timecard is being sent for approval to 2 different approvers having details of time entered against their respective project
-
WPF: How to know the selection is come from datagrid or from ListBox?
Our application has a page which includes DataGrid and ListBox. Both ItemSource are binding to PlateCells. public ObservableCollection<CellVM> PlateCells public class CellVM : BaseViewModel public CellVM(int wellNumber) WellNumber = wellNumber; Row =