Database design: field to store percent value

I need to create a table T that holds field P which is going to store percentage values.
1. Should database store in field P value "3.5" or "0.035" if user enters on web page string "3,5%"? Which is wiser design- to store as values in range 0..1, or in range 0...100 for percentages?
2. How does enterprise products solve this? For example, "Oracle E-Business Suite" is there any field that holds percentage value? How it holds?
Thanks.

1. Should database store in field P value "3.5" or "0.035" if user enters on web page string "3,5%"?
Which is wiser design- to store as values in range 0..1, or in range 0...100 for percentages?I prefer storing percentages as numbers in the range 0...1.
To constrain the values on the db filed you can create a check constraint:
SQL> create table test (pct number(4,3));
Table created.
SQL> alter table test add constraint pct_chk
2 check (pct between 0 and 1);
Table altered.
SQL> insert into test values (1.001);
insert into test values (1.001)
ERROR at line 1:
ORA-02290: check constraint (USER.PCT_CHK) violated
SQL> insert into test values (1);
1 row created.
SQL> insert into test values (0.001);
1 row created.
SQL> insert into test values (0);
1 row created.
SQL> insert into test values (-0.001);
insert into test values (-0.001)
ERROR at line 1:
ORA-02290: check constraint (USER.PCT_CHK) violated
2. How does enterprise products solve this? for example, Oracle Erp is there any field that holds percentage value?I don't know.
Max
[My Italian Oracle blog|http://oracleitalia.wordpress.com/2010/01/17/supporto-di-xml-schema-in-oracle-xmldb/]

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You are posting in the database design forum but it seems to me that you have 2 separate but highly dependent issues - neither of which is really database design related at this point. Rather you have an user interface issue and an database programmability
issue. Those I cannot really address since much of that discussion requires knowledge of your users, how they interface with the database, what they use the data for, etc. In addition, it seems that Excel is the primary interface for your users
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I would rather not have the server resolve the views for the complete data set
I don't understand the above statement but it scares me. IMO, you DO want the server to do as much work as possible since it is closest to the data and has (or should have) the resources to access and manipulate the data and generate the desired
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I considered parameterisation of views, but I dont believe views support parameters, I also considered stored procedures, but I dont believe that stored procedures allow result sets to be used as pseudo tables.
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attempting to model?

Database design and pl/sql vs external procedures

hi,
My project involves predicting arrival time of a bus at a bus-stop, given statistical data of traffic patterns on the previous n(say 3) days, as well as the current location of the bus(latitude-longitude).
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END_LATITUDE          NUMBER
END_LONGITUDE          NUMBER
END_STOP_ID          NUMBER
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STOPS_ENROOUTE          VARRAY(30) OF NUMBER
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BUS_ID           NUMBER          [PRIMARY-KEY]
ROUTE          VARCHAR2(20)
LATITUDE          NUMBER
LONGITUDE          NUMBER
TS               TIMESTAMP
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BUS_ID           NUMBER     [PRIMARY-KEY]
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On insert/update of track determine which link the us is currently on.
Invoke a procedure that calculates perpendicular distance from current location to all links en-route (cursor on LINKS).
Results are stored in a temporary table. Select the link-id of the tuple whose perpendicular distance is MINIMUM. This is the link the bus is currently on. Place link-id, start_stop_id and end_stop_id in corresponding row of TRACK.
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Determine distance until destination for each STOP, 20 stops down from stop current location.
Determine current avg. speed of the bus over a 2 hour window, by dividing total distance traveled by time taken.
Calculate time-until arrival T1=current avg. speed * distance until destination
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hello,
actually i can manage ETA without a varray, since there will b a maxximum of 3 -4 values of expected arrival times at each stop. this can b done with separate columns.
though i dont quite understand how lag() will help me...from what i understand lag() is to access values of previous rows. but in ETA table each element in the varray(if there is one) is going to be the expected arrival time of buses on a particular route at that particular stop, and is different from the arrival time at a previous stop(i.e.row).
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Thank you
Amina
As an aside, external procedures tend by their very
nature to be slow - there's an overhead incurred
each time we step outside the database. Therefore
you really ought to avoid using a C extproc unless
your calculations really cannot be done in PL/SQL or
a Java Stored Procedure.
Also, before you go down the VARRAY route you should
consider the virues of analytic functions, notably
[url=http://download-west.oracle.com/docs/cd/B1050
1_01/server.920/a96540/functions56a.htm#83619]LAG()[/u
rl]. I think you really ought to do some
benchmarking of parformance before you start afdding
denormalised columns like ETA. You may find the
overhead in maintaining those columns exceeds their
perceived benefits.
Cheers, APC

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I'm working on a Java web app that includes creating
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SIMPLE Database Design Problem !

Mapping is a big problem for many complex applications.
So what happens if we put all the tables into one table called ENTITY?
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>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
check the coloumn with WHERE _entityType='PERSON'
as there is is clustered index on entityType...there
is NO performance decrease.
there is also a clustered index on RELATION table on
relationType
when we say WHERE _entityType ='PERSON' or
WHERE relationType='CONTACTMECHANISM'.
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>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Have you ever thought of using constraints in your
modell? How would you realize those?
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model in an object database.The knowledge information
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But the data schema is held in the RDBMS with code
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But in able to have a efficent mapping and a good
performance we have thought about building only one
table.The problem is we know we are losing some space
but the thing is harddisk is much cheaper than RAM
and CPU.So our trade off concerated on the storage
cost.But I still wonder if there is a point that I
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PS: it is not wise effective using generic object
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PS2: RDBMS is a value based system where object
databases are identity based.we are trying to be in
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C.

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The way our database is designed, this involves 3 different tables:
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The other problem, which I used a workaround on, dealt with a similar yet different situation.
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Hi,
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Anyway you can call a PLSQL API (to create a row in the Custom Table and store the value and also to make a foreign key join therein). This PLSQL can be called from the Controller (extend the standard Controller).
Now when you come to the Page, either you substitute the standard VO, or easier still (since I assume checkbox is on the Page and not in the table), you can call a PLSQL function and get the value of the checkbox. May be you can also create a dymanic VO and get the value from the Custom table for the current standard table row.
Please do a compete thinking on the idea above and do let me know where you forsee issues. The above solution focusses more on PLSQL API invocations and thus decreases the need for Substitutions.
Thanks
Sumit

What is the datatype to store the value of variable of UTL_HTTP.resp

Hello,
I am using Oracle 11g R2 SOE.
I have table Called SMS consists of two columns (TEXT , RESPONSE) to store the value of variable of type UTL_HTTP.resp
the datatype of TEXT column is varchar2.
What should be the datatype of the column RESPONSE that is supposed to store the value of a variable of type UTL_HTTP.resp ????
Please see the following example if it was not clear;
Declare
l_url2 SMS.RESPONSE%TYPE;
l_http_request2   UTL_HTTP.req;
l_http_response2 UTL_HTTP.resp;
begin
l_http_request2 := UTL_HTTP.begin_request(l_url2);
l_http_response2 := UTL_HTTP.get_response(l_http_request2);
insert into SMS (text,response) values (l_url2,l_http_response2);
UTL_HTTP.end_response(l_http_response2);
end;Regards,
Fateh

Fateh wrote:
Hello,
I am using Oracle 11g R2 SOE.
I have table Called SMS consists of two columns (TEXT , RESPONSE) to store the value of variable of type UTL_HTTP.resp
the datatype of TEXT column is varchar2.
What should be the datatype of the column RESPONSE that is supposed to store the value of a variable of type UTL_HTTP.resp ????
Please see the following example if it was not clear;
Declare
l_url2 SMS.RESPONSE%TYPE;
l_http_request2   UTL_HTTP.req;
l_http_response2 UTL_HTTP.resp;
begin
l_http_request2 := UTL_HTTP.begin_request(l_url2);
l_http_response2 := UTL_HTTP.get_response(l_http_request2);
insert into SMS (text,response) values (l_url2,l_http_response2);
UTL_HTTP.end_response(l_http_response2);
end;Regards,
Fatehutl_http.resp is a record type Its defined like this
TYPE resp IS RECORD (
   status_code    PLS_INTEGER,
   reason_phrase VARCHAR2(256),
   http_version   VARCHAR2(64));http://docs.oracle.com/cd/B19306_01/appdev.102/b14258/u_http.htm#i1012713
I would suggest in your table you split the RESPONSE column into 3 different column and store the fields STATUS_CODE, REASON_PHARSE and HTTP_VERSION accordingly.

Downloading a file from Database [Blob field]

I am trying to write an application which can upload and download files [Excel, Word etc.] to/from an Oracle 9i database Blob field. I am using Java/JSP for the same.
The upload part works just fine. However, when I try to download the file that I uploaded, I get an error.
A dialog box comes up asking me to Open/Save the file. However, when I try to save it, it says
�Internet Explorer cannot download �..tion=download&planId= testplan from localhost
Internet Explorer was not able to open this Internet Site. The requested site is either unavailable or cannot be found. Please try again later.�
I am using IE 6.0. I tested the same with Firefox browser and was able to download the file.
Can anyone help?
Code:
Following is the code I am using for the same.
/* Code to retrieve from Blob field */
String sqlString = "SELECT PLAN_DOCUMENT_NAME,PLAN_DOCUMENT FROM BRS_PLAN_DESCRIPTION WHERE PLAN_ID = ?";
ps = con.prepareStatement(sqlString);
ps.setString (1,planId);
rs = ps.executeQuery();
while (rs.next()) {
     fileBytes = rs.getBytes("PLAN_DOCUMENT");
     fileName = rs.getString("PLAN_DOCUMENT_NAME");
brsPlanDocument.setPlanId(planId);
brsPlanDocument.setFileName(fileName);
brsPlanDocument.setFileBytes(fileBytes);
/* Code for download */
String fileName = brsPlanDocument.getFileName();
String fileType = fileName.substring(fileName.indexOf(".")+1,fileName.length());
if (fileType.trim().equalsIgnoreCase("txt"))
     response.setContentType( "text/plain" );
else if (fileType.trim().equalsIgnoreCase("doc"))
     response.setContentType( "application/msword" );
else if (fileType.trim().equalsIgnoreCase("xls"))
     response.setContentType( "application/vnd.ms-excel" );
else if (fileType.trim().equalsIgnoreCase("pdf"))
     response.setContentType( "application/pdf" );
else if (fileType.trim().equalsIgnoreCase("ppt"))
     response.setContentType( "application/ppt" );
else
     response.setContentType( "application/octet-stream" );
response.setHeader("Content-Disposition","attachment; filename=\""+fileName+"\"");
response.setHeader("cache-control", "no-cache");
byte[] fileBytes=brsPlanDocument.getFileBytes();
ServletOutputStream outs = response.getOutputStream();
outs.write(fileBytes);
outs.flush();
outs.close();

Hi,
is this problem solved for you, I am also writing the java code to store different files in blob fields in database(db2udb) and allow users to open them through jsp pages. Upload seems to be working fine.....My big problem is only excel files are opened properly in both IE and Firefox. Word files, image files are not getting opened. Any suggestion as what I could be doing wrong....my jsp is kind of similar to the above one...
thanks in advace, please guide me
long pmsId = new Long(request.getParameter("pmsId")).longValue();
String fileName = request.getParameter("fileName");
int fileSeq = new Integer(request.getParameter("fileSeq")).intValue();
if(fileName.endsWith("txt")) {
response.setContentType("text/plain");
log.debug(" this is a text file");
} else if(fileName.endsWith("xls")) {
response.setContentType("application/vnd.ms-excel");
log.debug(" this is a excel file");
} else if(fileName.endsWith("gif")) {
response.setContentType("image/gif");
log.debug(" this is a image file");
} else if(fileName.endsWith("doc")) {
response.setContentType("application/msword");
log.debug(" this is a doc file");
} else if(fileName.endsWith("pdf")) {
response.setContentType("application/pdf");
log.debug(" this is a pdf file");
} else if(fileName.endsWith("ppt")) {
response.setContentType("application/ppt");
log.debug(" this is a ppt file");
} else {
response.setContentType("application/everythingelse");
log.debug(" this is a unknown ile");
response.setHeader("Content-Disposition", "attachment;filename="+fileName);
OutputStream out1 = response.getOutputStream();
Class.forName("com.ibm.db2.jcc.DB2Driver");
db2Conn = DriverManager.getConnection("jdbc:db2:TESTDB","db2admin","db2fv1000");
//log.debug("connection obtained");
pstmt = db2Conn.prepareStatement(" SELECT * FROM UPLOADDOCS WHERE PMSID = ? AND DOCSEQ = ? ");
//log.debug("statemenmt prepared");
pstmt.setLong(1, pmsId);
pstmt.setInt(2, fileSeq);
rs = pstmt.executeQuery();
int count = 0;
if(rs.next()){
InputStream is = rs.getBinaryStream("DOCUMENT"); //"is" is
//now the binary data
//of the file
byte[] buf = new byte[4096];
int len;
while ((len = is.read(buf)) > 0)
     out1.write(buf, 0, len);
out1.close();
out1.flush();

Database design: field to store percent value

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