Data passed from Java to a PL/SQL function
OK, I am at the beginner-to-intermediate level when it comes to PL/SQL...and a virtual novice when it comes to Java, so please forgive me if my question seems strange or naive.
We are developing a Java-based web app. Some of the screens are reminiscent of a spreadsheet-type layout--potentially LOTS of rows and LOTS of columns (actually, an open-ended # of rows/columns--the rows represent a particular 'thing' and the columns represent the dates on which that 'thing' occurred), where the user can check off any and all the cells that apply. We are also 'auditing' all database activity (who did what to the data, and when). The approach we have chosen is as follows: When the user clicks save, the first thing we do is 'inactivate' all of the existing active rows in the db for that screen, whether or not they have changed(i.e., there is an 'active' flag that we set to false & we also save the user id of the person making the change and the date time of the change). Then the Java code calls the database once per row/contiguous column unit. For instance, on a single row, if the user checks off columns 1-4 and 7-15 and column 21 the Java code will send three calls to the database for that row with info about the start/stop column for each unit.
OK--here is my concern...the majority of the time there will be a reasonably small #of 'units'. Occasionally there will be a moderate, and once in awhile a LARGE # of 'units'. So, let's take an extreme case and say that currently the db has 200 such row/contiguous column units for a given screen. The user goes into that screen and adds the 201st unit, then clicks Save. Java calls the db to first inactivate the 200 rows. Then one by one Java calls the db to add the rows back in, only on row #40, the internet connection is lost. The only way the user can tell what happened is to look at the entire screen and reverify ALL the data in order to tell what got saved/resaved and what didn't. Obviously this is a bad situation that we want to avoid.
I should add that the reason this approach was chosen is that the Java developers thought it would be way too complex in this situation to track the changes the user made on the screen, sort out what has been added/modified/deleted, and only call the db for changes.
So given this background, can anyone offer any suggestions/ideas on how we can prevent unintended data loss given the auditing constraints and concern about minimizing complexity on the Java side (redesigning the GUI screen is NOT an option, as the users are very attached to this design)?
Is there a way for Java to pass a multidimensional (& variable-sized) array to a PL/SQL function? Can Oracle's complex (row, table) data types be used in a function's parameter string, and if so...how?...Or else is there some way we can send a single call to the db on a screen like this one? We thought of calling the db once and sending one very large string packed with all the data (could get very big, not sure of Oracle's limatations on passed data--is it 32K for varchar2? )
Advice, ideas, even random thoughts would be greatly appreciated!
Tracy,
<quote>⦠only on row #40, the internet connection is lost. The only way the user can tell what happened is to look at the entire screen and reverify ALL the data in order to tell what got saved/resaved and what didn't</quote>
That would be "the only way" if the Java programmers had decided to totally bury the error ⦠what should happen here is the end-user should get a proper error message ⦠no need to re-verify at this point since all bets are off (in fact, nothing shouldâve been changed in the database).
Nonetheless, your concerns regarding the chosen approach are valid ⦠making multiple calls to the database after a Save makes controlling a business transaction rather complex (in an n-tier system) ⦠they should make one call only to the database passing in all the data to be saved ⦠one database transaction ⦠either all changes get applied or none.
The fact that lots of data may need to be passed in for one Save is of no relevance ⦠if you have to carry 500Kb of data for that screen then, well, you have to do it ⦠1 bucket of 500Kb or 50 buckets of 10Kb? ⦠it doesnât really matter as far as the actual transport part is concerned.
As already answered, one can pass complex types in pl/sql ⦠so one database call per Save would be my first random thought. There are lots of suspect things in here ⦠some things you didnât mentioned at all ⦠like how is concurrency addressed? ⦠have you/they implemented some sort of optimistic locking mechanism? Of course the architecture of your system wonât be solved in a forum ⦠so, finding a good system/data/Oracle architect on site for the project would be my second random thought.
PS. One last random thought ⦠fight off that idea of packing and sending large strings (XML or not) ⦠if the data is structured then contemplate XML for no more than few seconds.
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<quote>⦠only on row #40, the internet connection is lost. The only way the user can tell what happened is to look at the entire screen and reverify ALL the data in order to tell what got saved/resaved and what didn't</quote>
That would be "the only way" if the Java programmers had decided to totally bury the error ⦠what should happen here is the end-user should get a proper error message ⦠no need to re-verify at this point since all bets are off (in fact, nothing shouldâve been changed in the database).
Nonetheless, your concerns regarding the chosen approach are valid ⦠making multiple calls to the database after a Save makes controlling a business transaction rather complex (in an n-tier system) ⦠they should make one call only to the database passing in all the data to be saved ⦠one database transaction ⦠either all changes get applied or none.
The fact that lots of data may need to be passed in for one Save is of no relevance ⦠if you have to carry 500Kb of data for that screen then, well, you have to do it ⦠1 bucket of 500Kb or 50 buckets of 10Kb? ⦠it doesnât really matter as far as the actual transport part is concerned.
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Here is my regexpr for oracle and below the Java version
Oracle version:
^([A-Z0-9]{3})(\d{4,6})([A-Z]{2})(\d{2})\-(\d{2})([A-Z]{2})(?:\-(GA|CA|DEC|INFR|INF|CAC|DECC)?(\d{1,3})?)?(?:\-(\d{2})?((?:C|A|R|FIN|PC|APC|APCFIN|DEF|VO)+[0-9]*)?)?(?:\-(AV|CP|D|LP|NI|OJ|PF|PV|RA|RAS))?(?:\-(\d{1,}))?(?:\-([^\s]{1,}))?\-(OR|ORAN|RELU|TR|TRAN)(\.\w*)?$Java version
^([A-Z0-9]{3})(\\d{4,6})([A-Z]{2})(\\d{2})\\-(\\d{2})([A-Z]{2})(?:\\-(GA|CA|DEC|INFR|INF|CAC|DECC)?(\\d{1,3})?)?(?:\\-(\\d{2})?((?:C|A|R|FIN|PC|APC|APCFIN|DEF|VO)+[0-9]*)?)?(?:\\-(AV|CP|D|LP|NI|OJ|PF|PV|RA|RAS))?(?:\\-(\\d{1,}))?(?:\\-([^\\s]{1,}))?\\-(OR|ORAN|RELU|TR|TRAN)(\\.\\w*)?$I simply changed double backslashing \\ to simple backslashing \
Is my conversion wrong ?
Here are some test values
Value JAVA ORACLE
FG1000054EL01-06PP-OR.pdf OK OK
SGL005738FR01-09PP-DEC127-09-OR.doc OK NOK
FED004721EN08-09PP-DEC115-09APCFINC1-RA-Word2007_docx_renamed_back-OR.doc OK NOK
FG1000054EL01-06PP-RELU.pdf OK NOK
toto NOK NOKThanks for help
Edited by: Liandra Flaris on Oct 14, 2009 3:35 PMHi,
Sorry, I can't understand your message.
Whenever you post code or formatted text on this sit, type
{code}
(small letters only, inside curly brackets) before and after sections of formatted text, to preserve spacing, and to keep brackets (which are common in regular expressions) from being treated as markup.
Format and coimmnet your code. For example:
SELECT REGEXP_REPLACE ( '&txt'
, '(^|[^t[:blank:]|[:space:]])' || -- \1 = Begining or some character other than t or space
'([[:blank:][:space:]]*)' || -- \2 = optional space
'(create)' || -- \3 = 'create'
'[[:blank:][:space:]]+' || -- at least 1 space
'(materialized)' -- \4 = 'materialized'
, '\1\2\3 OR REPLACE /*ADDED*/ \4'
, 1
, 0
, 'i'
FROM dual;Not everyone is familiar with regular expressions in Java. Can you explain what you code is supposed to do?
Why did you double the \ characters?
Use {code} tags around the output, too, so that people can tell what's in each column.
Are the results in the Java column correct? -
Passing #COLUMN_VALUE# as parameter to pl/sql function in column template
Hi all,
I want to color negative amounts in red in sql report using column template.
I created a pl/sql function"isNegativeNum" which returns 1 or -1.
create or replace function isNegativeNum(p_column_value varchar2) return number
as
l_dummy number;
begin
l_dummy := to_number(p_column_value,'999G999G990D00PR');
IF l_dummy < 0
THEN
RETURN 1;
else
return -1;
END IF;
exception
when others then
RETURN -1;
end;Below is column template.
Column Template 1
<td class="t3dataalt" #ALIGNMENT#><p color=red>#COLUMN_VALUE#</p></td>Column Template 1 Condition
isNegativeNum('#COLUMN_VALUE#') = -1The issue is #COLUMN_VALUE# value is not being passed to the function, Insert statement in function reveals p_column_value as a string "#COLUMN_VALUE#". When I try without quotes like isNegativeNum(#COLUMN_VALUE#) = -1, I get below error.
ORA-06550: line 1, column 48: PLS-00103: Encountered the symbol "#" when expecting one of the following: ( ) - + case mod new not null others select table avg count current exists max min prior sql stddev sum variance execute multiset the both leading trailing forall merge year month DAY_ hour minute second timezone_hour timezone_minute timezone_region timezone_abbr time timestamp interval date
Error ERR-1025 Error processing PLSQL expression. isNegativeNum(#COLUMN_VALUE#) = 1
Any help is appreciated.
KishoreHi Kishore,
using #COLUMN_VALUE# would probably not make much sense, because normally a report has multiple columns and not just the numeric column which you want to verify if it's negative. But APEX will fire the template condition for each column, because the report template is a column cell template.
What you can do to make it more generic is to use for example
#CHECK_AMOUNT#
in the template and provide a not displayed column in your SQL statement which contains your value which is named CHECK_AMOUNT. For example:
SELECT NAME
, BALANCE
, BALANCE AS CHECK_AMOUNT
FROM XXX;Because this CHECK_AMOUNT column would be a generic name, you can use this template in all your reports as long as you provide this column.
Thope that helps
Patrick
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