Best way to write Web API
Hi,
I want to write the Web API ( say a json )in CQ so that I can consume this API to get some information about the content.
I am thinking of wiriting servlets ( OSGI components ) and expose the path with selector and extension. Is this a right approach or there are some better ways to get this implementation. I need the Caching implmented as well.
Advise on same.
Thanks.
post EXPLAIN PLAN
SELECT col1,
COUNT(*)
FROM tablea
GROUP BY col1
HAVING COUNT(*) = (SELECT MAX(vals)
FROM (SELECT col1,
COUNT(*) AS vals
FROM tablea
GROUP BY col1
HAVING COUNT(*) > 1))
Similar Messages
-
Best way to write SELECT statement
Hi,
I am selecting fields from one table, and need to use two fields on that table to look up additional fields in two other tables.
I do not want to use a VIEW to do this.
I need to keep all records in the original selection, yet I've been told that it's not good practice to use LEFT OUTER joins. What I really need to do is multiple LEFT OUTER joins.
What is the best way to write this? Please reply with actual code.
I could use 3 internal tables, where the second 2 use "FOR ALL ENTRIES" to obtain the additional data. But then how do I append the 2 internal tables back to the first? I've been told it's bad practice to use nested loops as well.
Thanks.Hi,
in your case having 2 internal table to update the one internal tables.
do the following steps:
*get the records from tables
sort: itab1 by key field, "Sorting by key is very important
itab2 by key field. "Same key which is used for where condition is used here
loop at itab1 into wa_tab1.
read itab2 into wa_tab2 " This sets the sy-tabix
with key key field = wa_tab1-key field
binary search.
if sy-subrc = 0. "Does not enter the inner loop
v_kna1_index = sy-tabix.
loop at itab2 into wa_tab2 from v_kna1_index. "Avoiding Where clause
if wa_tab2-keyfield <> wa_tab1-key field. "This checks whether to exit out of loop
exit.
endif.
****** Your Actual logic within inner loop ******
endloop. "itab2 Loop
endif.
endloop. " itab1 Loop
Refer the link also you can get idea about the Parallel Cursor - Loop Processing.
http://wiki.sdn.sap.com/wiki/display/Snippets/CopyofABAPCodeforParallelCursor-Loop+Processing
Regards,
Dhina.. -
Please let me know best way to write this SQL.
select col1, count(*)
from TableA
group by col1
having count(*) =
(select max(vals)
from
select col1, count(*) as vals
from TableA
group by col1
having count(*) > 1
)post EXPLAIN PLAN
SELECT col1,
COUNT(*)
FROM tablea
GROUP BY col1
HAVING COUNT(*) = (SELECT MAX(vals)
FROM (SELECT col1,
COUNT(*) AS vals
FROM tablea
GROUP BY col1
HAVING COUNT(*) > 1)) -
What is a best way to write SQL ?
Sample Case
drop table t;
drop table b;
create table t ( a varchar2(4), b number, c varchar2(1));
insert into t values ('A00', 10, 'R');
insert into t values ('A01', 11, 'R');
insert into t values ('A02', 12, 'R');
insert into t values ('A03', 13, 'R');
insert into t values ('A00', 10, 'P');
insert into t values ('A01', 11, 'P');
insert into t values ('A02', 12, 'P');
insert into t values ('A03', 13, 'P');
commit;
create table b ( j varchar(4), k varchar2(1), l varchar2(5), m number(3), n varchar2(5), o number(3));
insert into b values ('A00', 'P', 'FIXED', 100, 'FLOAT', 60);
insert into b values ('A01', 'P', 'FIXED', 101, 'FIXED', 30);
insert into b values ('A02', 'R', 'FLOAT', 45, 'FLOAT', 72);
insert into b values ('A03', 'R', 'FIXED', 55, 'FLOAT', 53);
commit;
10:19:13 SQL> select * from t;
A B C
A00 10 R
A01 11 R
A02 12 R
A03 13 R
A00 10 P
A01 11 P
A02 12 P
A03 13 P
8 rows selected.
10:19:19 SQL> select * from b;
J K L M N O
A00 P FIXED 100 FLOAT 60
A01 P FIXED 101 FIXED 30
A02 R FLOAT 45 FLOAT 72
A03 R FIXED 55 FLOAT 53
1/ In table t each reference having 2 records one with P another is with R
2/ In table b each refrence merged into single record and there are many records which are not existing in table t
3/ both t and j tables can be joined using a = j
4/ If from table t for a reference indicator is 'P' then if have to pick up l and m columns, if it is 'R' then I have to pick up n and o columns
5/ I want output in following format
A00 P FIXED 100
A00 R FLOAT 60
A01 P FIXED 101
A01 R FIXED 30
A02 P FLOAT 72
A02 R FLOAT 45
A03 P FLOAT 53
A03 R FIXED 55
6/ Above example is a sample ouput, In above example I have picked up only l,m,n,o columns, but in real example there are many columns ( around 40 ) to be selected. ( using "case when" may not be practical )
Kindly suggest me what is a best way to write SQL ?
thanks & regards
pjpIs this?
select b.j,t.c as k,decode(t.c,'P',l,n) as l,decode(t.c,'P',m,o) as m
from t,b
where t.a=b.j
order by j,k
J K L M
A00 P FIXED 100
A00 R FLOAT 60
A01 P FIXED 101
A01 R FIXED 30
A02 P FLOAT 45
A02 R FLOAT 72
A03 P FIXED 55
A03 R FLOAT 53
8 rows selected.
or is this?
select b.j,t.c as k,decode(t.c,b.k,l,n) as l,decode(t.c,b.k,m,o) as m
from t,b
where t.a=b.j
order by j,k
J K L M
A00 P FIXED 100
A00 R FLOAT 60
A01 P FIXED 101
A01 R FIXED 30
A02 P FLOAT 72
A02 R FLOAT 45
A03 P FLOAT 53
A03 R FIXED 55
8 rows selected. -
Dear all,
Can someone say the best way writing below stored proc:
procedure missing_authorized_services is
v_truncate_sql varchar2(200);
v_sql varchar2(2000);
BEGIN
v_truncate_sql := 'truncate table missing_authorized_services';
execute immediate v_truncate_sql;
commit;
v_sql := 'INSERT into missing_authorized_services select distinct trim(service_group_Cd) as service_group_Cd, trim(service_cd) as service_cd from stage_1_mg_service_request
where (service_group_cd, service_cd) not in (
select distinct service_group_cd, service_cd from stage_3_servcd_servgrp_dim)';
execute immediate v_sql;
commit;
END missing_authorized_services;
/* I am doing select from table and then try to Insert into a different table the result set */
Please guide,
Thanks
JHi,
The best way to write PL/SQL (or any code) is in very small increments.
Start with a very simple procedure that does something (anything), just enough to test that it's working.
Add lots of ouput statments so you can see what the procedure is doing. Remember to remove them after testing is finished.
For example:
CREATE OR REPLACE procedure missing_authorized_services IS
v_truncate_sql VARCHAR2 (200);
BEGIN
v_truncate_sql := 'truncate table missing_authorized_services';
dbms_output.put_line ( v_truncate_sql
|| ' = v_truncate_sql inside missing_authorized_services'
END missing_authorized_services;If you get any errors (for example, ORA-00955, becuase you're trying to give the same name to a procedure that you're already using for a table), then fix the error and try again.
When it worls perfectly, then add another baby step. For example, you might add the one line
EXECUTE IMMEDIATE v_truncate_sql;and test again.
Don't use dynamic SQL (EXECUTE IMMEDIATE) unless you have to.
Is there any reason to use dynamic SQL for the INSERT? -
Best way to write an Wrapper class around a POJO
Hi guys,
What is the best way to write an Wrapper around a Hibernate POJO, given the latest 2.2 possibilities? The goal is, of course, to map 'regular' Java Bean properties to JavaFX 2 Properties, so that they can be used in GUI.
Thanks!what about this:
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
public class PersonPropertyWrapper {
private StringProperty firstName;
private StringProperty lastName;
private Person _person;
public PersonPropertyWrapper(Person person) {
super();
this._person = person;
firstName = new SimpleStringProperty(_person.getFirstName()) {
@Override
protected void invalidated() {
_person.setFirstName(getValue());
lastName = new SimpleStringProperty(_person.getLastName()) {
@Override
protected void invalidated() {
_person.setLastName(getValue());
public StringProperty firstNameProperty() {
return firstName;
public StringProperty lastNameProperty() {
return lastName;
public static class Person {
private String firstName;
private String lastName;
public String getFirstName() {
return firstName;
public void setFirstName(String firstName) {
this.firstName = firstName;
public String getLastName() {
return lastName;
public void setLastName(String lastName) {
this.lastName = lastName;
public static void main(String[] args) {
Person p = new Person();
p.setFirstName("Jim");
p.setLastName("Green");
PersonPropertyWrapper wrapper = new PersonPropertyWrapper(p);
wrapper.firstNameProperty().setValue("Jerry");
System.out.println(p.getFirstName());
}Edited by: 906680 on 2012-7-27 上午10:56 -
What is the best way to write 10 channels of data each sampled at 4kHz to file?
Hi everyone,
I have developed a vi with about 8 AI channels and 2 AO channels... The vi uses a number of parallel while loops to acquire, process, and display continous data.. All data are read at 400 points per loop interation and all synchronously sampled at 4kHz...
My questions is: Which is the best way of writing the data to file? The "Write Measurement To File.vi" or low-level "open/create file" and "close file" functions? From my understanding there are limitations with both approaches, which I have outlines below..
The "Write Measurement To File.vi" is simple to use and closes the file after each interation so if the program crashes not all data would necessary be lost; however, the fact it closes and opens the file after each iteration consumes the processor and takes time... This may cause lags or data to be lost, which I absolutely do not want..
The low-level "open/create file" and "close file" functions involves a bit more coding, but does not require the file to be closed/opened after each iteration; so processor consumption is reduced and associated lag due to continuous open/close operations will not occur.. However, if the program crashes while data is being acquired ALL data in the buffer yet to be written will be lost... This is risky to me...
Does anyone have any comments or suggestions about which way I should go?... At the end of the day, I want to be able to start/stop the write to file process within a running while loop... To do this can the opn/create file and close file functions even be used (as they will need to be inside a while loop)?
I think I am ok with the coding... Just the some help to clarify which direction I should go and the pros and cons for each...
Regards,
Jack
Attachments:
TMS [PXI] FINAL DONE.vi 338 KBOne thing you have not mentioned is how you are consuming the data after you save it. Your solution should be compatible with whatever software you are using at both ends.
Your data rate (40kS/s) is relatively slow. You can achieve it using just about any format from ASCII, to raw binary and TDMS, provided you keep your file open and close operations out of the write loop. I would recommend a producer/consumer architecture to decouple the data collection from the data writing. This may not be necessary at the low rates you are using, but it is good practice and would enable you to scale to hardware limited speeds.
TDMS was designed for logging and is a safe format (<fullDisclosure> I am a National Instruments employee </fullDisclosure> ). If you are worried about power failures, you should flush it after every write operation, since TDMS can buffer data and write it in larger chunks to give better performance and smaller file sizes. This will make it slower, but should not be an issue at your write speeds. Make sure you read up on the use of TDMS and how and when it buffers data so you can make sure your implementation does what you would like it to do.
If you have further questions, let us know.
This account is no longer active. Contact ShadesOfGray for current posts and information. -
What's the best way for a web app to handle logins and sessions?
I'm deploying in JBoss, using JSF. As is often the case, I keep User information in an entity bean. My question is, what's the best way to handle this bean?
My inclination is to create a login page with a LoginBackingBean atached to it. When the user attempts to log in, it will see if there is a User entity bean that corresponds to the given name and password. If there is no User bean that matches, obviously we show an informative error screen.
But what happens if there is a valid user?
In the plain old Servlet world (without EJB / J2EE) I would just put the User object (it's an object, not an EJB) into the HttpSession, and I would create a Filter that would check for the presence of that User object, and I would map the filter to something like /members/*, and that would be it. I would use Hibernate to persist the User object, and there would also be a filter that creates a Hibernate session and stores it in the Request so that the User object would work and persist.
How do I do this within the J2EE / EJB world?
My first thought would be to just do the same thing. Install the User bean into the HttpSession, and create a filter and do all the same stuff. Is that the right way to do it? It would work pretty well with JSF because I could just access things in the normal JSF way: #{user.firstName} would find the "user" object in the HttpSession scope. So that's good.
One question that comes up from that is if the user makes some change to the User object that is in the Session scope, will the EJB automatically do the right thing and make those changes persistent? Is there anything else I need to do?
I'm new to the EJB world, but from what I can see so far, it seems like it's the best way to think about a web application.
Thankshi ,
i think the best way is to create java beans ,in that bean call your EJB ,
and check the validation over there.
and make that bean scope to session.
in each and everypage try to check the session ,if it is not valid then forward to your login page...
otherwise continue to give access to him like guest
Regards,
AfTaB -
Best way to write readable code?
So I'm waist deep in building my GUI by hand and it occurs to me that I'm probably not doing this the best way possible. What I have now is listed below and I was thinking that other possibilities would be to write other methods like initMainFrame() and initSearchPanel() and such that would be called from initComponents() (though I would have to either put the objects outside of those methods, probably declared immediately above the method declaration for readability, or somehow make them class scope that're declared within a method which I think I've seen somewhere, but have been unable to reproduce) or to make new class files that handle this.
So any comments on my ideas (good/bad/etc) or insight on how you structure your code when making a GUI would be much appreciated.
public static void initComponents() {
// main frame
JFrame mainFrame = new JFrame("CookBook");
Dimension d1 = new Dimension(255, 255);
//mainFrame.setSize(d1);
BorderLayout mainLayout = new BorderLayout();
mainFrame.setLayout(mainLayout);
mainFrame.setPreferredSize(d1);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// end main frame
// menu
JMenuBar menuBar = new JMenuBar();
JMenu file = new JMenu("File") ;
JMenuItem exit = new JMenuItem("Exit");
file.add(exit);
menuBar.add(file);
mainFrame.setJMenuBar(menuBar);
// end menu
// start search bar
JPanel search = new JPanel();
SpringLayout searchLayout = new SpringLayout();
search.setLayout(searchLayout);
JLabel nameLabel = new JLabel("Name: ");
JTextField name = new JTextField(10);
searchLayout.putConstraint(SpringLayout.SOUTH, nameLabel, 0, SpringLayout.SOUTH, name);
searchLayout.putConstraint(SpringLayout.WEST, nameLabel, PADDING, SpringLayout.WEST, search);
searchLayout.putConstraint(SpringLayout.WEST, name, PADDING, SpringLayout.EAST, nameLabel);
searchLayout.putConstraint(SpringLayout.NORTH, name, PADDING, SpringLayout.NORTH, search);
search.add(nameLabel);
search.add(name);
Vector<String> initCatValue = new Vector<String>(1);
initCatValue.add("Category");
JComboBox category = new JComboBox(initCatValue);
category.setEditable(true);
searchLayout.putConstraint(SpringLayout.WEST, category, PADDING, SpringLayout.WEST, search);
searchLayout.putConstraint(SpringLayout.NORTH, category, PADDING, SpringLayout.SOUTH, name);
search.add(category);
mainFrame.add(search);
// end search bar
// status bar
JPanel status = new JPanel();
FlowLayout statusLayout = new FlowLayout(FlowLayout.RIGHT);
status.setLayout(statusLayout);
JProgressBar progressBar = new JProgressBar();
status.add(progressBar);
mainFrame.add(BorderLayout.SOUTH, status);
// end status bar
mainFrame.pack();
mainFrame.setVisible(true);
}or somehow make them class scope that're declared within a method which I think I've seen somewhere, but have been unable to reproduceIf this is your problem then here is one method:
public class GUI{
JFrame mainFrame;
public static void initComponents() {
initMainFrame();
initMenu();
initSearchPanel();
initStatusBar();
mainFrame.pack();
mainFrame.setVisible(true);
private void initMainFrame(){
// main frame
JFrame mainFrame = new JFrame("CookBook");
Dimension d1 = new Dimension(255, 255);
//mainFrame.setSize(d1);
BorderLayout mainLayout = new BorderLayout();
mainFrame.setLayout(mainLayout);
mainFrame.setPreferredSize(d1);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// end main frame
private void initMenu(){
// menu
JMenuBar menuBar = new JMenuBar();
JMenu file = new JMenu("File") ;
JMenuItem exit = new JMenuItem("Exit");
file.add(exit);
menuBar.add(file);
mainFrame.setJMenuBar(menuBar);
// end menu
private void initSearchPanel(){
// start search bar
JPanel search = new JPanel();
SpringLayout searchLayout = new SpringLayout();
search.setLayout(searchLayout);
JLabel nameLabel = new JLabel("Name: ");
JTextField name = new JTextField(10);
searchLayout.putConstraint(SpringLayout.SOUTH, nameLabel, 0, SpringLayout.SOUTH, name);
searchLayout.putConstraint(SpringLayout.WEST, nameLabel, PADDING, SpringLayout.WEST, search);
searchLayout.putConstraint(SpringLayout.WEST, name, PADDING, SpringLayout.EAST, nameLabel);
searchLayout.putConstraint(SpringLayout.NORTH, name, PADDING, SpringLayout.NORTH, search);
search.add(nameLabel);
search.add(name);
Vector<String> initCatValue = new Vector<String>(1);
initCatValue.add("Category");
JComboBox category = new JComboBox(initCatValue);
category.setEditable(true);
searchLayout.putConstraint(SpringLayout.WEST, category, PADDING, SpringLayout.WEST, search);
searchLayout.putConstraint(SpringLayout.NORTH, category, PADDING, SpringLayout.SOUTH, name);
search.add(category);
mainFrame.add(search);
// end search bar
private void initStatusBar(){
// status bar
JPanel status = new JPanel();
FlowLayout statusLayout = new FlowLayout(FlowLayout.RIGHT);
status.setLayout(statusLayout);
JProgressBar progressBar = new JProgressBar();
status.add(progressBar);
mainFrame.add(BorderLayout.SOUTH, status);
// end status bar
}There can many other methods to solve this same problem... choose anyone which suits you.
Thanks! -
Best way to write stream to OutputStream?
Hi, I need to write a string into an OutputStream (socket). I am a little confused how is the best way (most elegant, efficient) to do it.
Should I use a OutputStreamWriter? Sometimes, I also need to write raw bytes directly.
Currently, I am using:
ByteArrayOutputStream output = new ByteArrayOutputStream();
PrintStream printStream = new PrintStream(output);
socket.write(output.toByteArray(), 0 , output.size());
I would appreciate some oppinions.
ThanksHi, I need to write a string into an OutputStream
(socket). I am a little confused how is the best way
(most elegant, efficient) to do it.
Should I use a OutputStreamWriter?Yes.
Sometimes, I also need to write raw bytes directly.But does it happen in the same method? If so, you might need to re-design.
Currently, I am using:
ByteArrayOutputStream output = new
ByteArrayOutputStream();
PrintStream printStream = new PrintStream(output);
socket.write(output.toByteArray(), 0 ,
output.size());What's the BAOS good for? Why not String.getBytes(), if you have to use the bytes? -
Best way to write specific information to a file
Hi there,
I'm looking to write specific information from my program to 2 separate files.
Before the program runs, it asks the operator for their info (name, password, run ID #, a couple safety checkboxes).
So, I would like the first file to record log-in information (i.e. The operator's name, the date and time they accessed the program, and the Run ID #) all in a spreadsheet.
I would like the second file to record data from the different components of the program ( 2 tank levels, a flow meter, and run ID #) in another spreadsheet.
Any thoughts on the best way to do this? I've looked at using arrays to organize the info/data, and then write to spreadsheet, but I haven't quite figured it out...
Thanks,
DarynFor the first, you could convert everything to strings, then send an array of strings. For the second, just send an array of numbers.
Cameron
To err is human, but to really foul it up requires a computer.
The optimist believes we are in the best of all possible worlds - the pessimist fears this is true.
Profanity is the one language all programmers know best.
An expert is someone who has made all the possible mistakes.
To learn something about LabVIEW at no extra cost, work the online LabVIEW tutorial(s):
LabVIEW Unit 1 - Getting Started
Learn to Use LabVIEW with MyDAQ -
What the best ways to save web pages on the cloud ? Using an iPhone ?
Dear folks
I read a lot of web pages on iPhone that I need to refer to / come back to later
I have limited space on my iPhone and do not want to clutter the phone saving all these pages
What are the best options to
a) save these web pages on the cloud ?
B) Or mail them to myself ( again store on some specific gmail or so account ? )
Or
C) It would also be great to convert them to PDF and mail them to myself or save them on box dot net or Dropbox
Or
d) save them initially on the phone but , eventually move them in batches to my hard drive thru backups
What is the best option ? And What are the best ways to do this
Free apps / solutions preferred
If not so paid ones are okay
TIA
Regards
SubuImport photos to your computer, then delete the copies that reside on the phone. Also remove apps you no longer use.
-
What's the best way to write freehand with InDesign?
I have a Wacom and want to place some handwriting on my document - what's the best way to do this?
Try the pen or pencil tools or do it in Photoshop and place it.
Bob -
Best way to write entire DVD-R?
It's come to my attention that certain set top DVD players (Phillips in particular) won't play recordable media with a small amount of information written to the disc. But if you burn more than 4GB to the disc, the player reads the disc just fine. I'm working with a 15-minute program, so I'm obviously not near the 4GB. I'm interested in maximizing functionality and playability on all machines, so I'm wondering if there's a way within DVDSP, Disk Utility or Toast to write the entire disc. I've tested this by inserting video tracks that the user cannot reach from the menus, but the user could easily use the 'chapter forward' function and get lost in the dummy tracks. Thanks in advance for any thoughts.
Yes, TY media are good, but Memorex? This forum is littered with references to the coasters that they make.
The media in question here are TY, Verbatim and some leftover Apple brand discs from the old days. DVD-R manufacturer definitely has nothing to do with this. It's definitely an idiosyncrasy of the Phillips player in question. I've never had it happen with any of the other dozen or so players we have around here.
We maintain many different brands of DVD player in our studios to be able to simulate any situation our products may find themselves in. Our goal is to be able to reach the largest audience possible for our clients, no matter their technological limitations. That is not always easy or even possible, given the amount of old, poor, and poorly maintained computers and DVD players out there. But we try to reach as many as possible. As tempting as it might be to always blame the user's equipment, we have to try to find novel ways of making every project as accessible as possible.
I'll mark this question as answered, because I've discovered that there is no way to write to the edge of a DVD-R without the requisite amount of QT tracks within the DVDSP project. If anyone ever has any other ideas, please offer them. Thanks to all for contributing. -
Best way to write NotInFilter ?
What's the best way to accomplish a NotInFilter? I want to accomplish something like:
Filter includeThesePeople = new NotInFilter("getName", setOfExcludedPeople);Thanks,
AndrewHi Andrew
Yes, you need to chain two filters together
Set setResults = cache.entrySet(new NotFilter(
new InFilter("getName", setOfExcludedPeople)));
Thanks
/Charlie
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