Several if-clauses in an expression-box
Hello,
i've added a new column (expression-box | type: text) to a table-view.
But the following expression does not work (syntax-error). Is there a possibility to have serveral if-clauses in an expression box.
IF(@INITIATIVE != '',@INITIATIVE,'')
OR
IF(@MEASURE != '',@MEASURE,'')
OR
IF(@OBJECTIVE != '',@OBJECTIVE,'')
OR
IF(@PERSPECTIVE != '',@PERSPECTIVE,')
OR
IF(@STRATEGY != '',@STRATEGY,'')
Thank you for your help!
Tobias
Message was edited by: Tobias Gronbach
You can use the '? :' operators in EL
e.g.. following code is genered by JHS for tables:
emptyText="#{bindings.MyVOTable.viewable ? 'No rows yet.' : 'Access Denied.'}"
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Introduction
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Let's check for all rows where column col1 does NOT include an unsigned integer. I'll use this SELECT for demonstrating different values and search patterns:
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Now looking for integers is nice, but what about decimal numbers? Those may be a bit more complicated, but all I have to do is again to think in (meta) characters. I'll just use an example where the decimal point is represented by ".", which again needs escaping, since it's also the place holder in regular expressions for "any character".
Valid decimals in my example would be ".0", "0.0", "0.", "0" (integer of course) but not ".". If you want, you can test it with the TO_NUMBER function. Finding such an unsigned decimal number could then be formulated like this: from the beginning of a string we will either allow a decimal point plus any number of digits OR at least one digits plus an optional decimal point followed by optional any number of digits. Think about it for a minute, how would you formulate such a search pattern?
Compare your solution to this one:
'^(\.[0-9]+|[0-9]+(\.[0-9]*)?)$'
Addendum: Here I have to use both "?" and "*" to make sure, that I can have 0 to many digits after the decimal point, but only 0 to 1 occurrence of this substrings. Otherwise, strings like "1.9.9.9" would be possible, if I would write it like this:
'^(\.[0-9]+|[0-9]+(\.[0-9]*)*)$'Some of you now might say: Hey, what about signed decimal numbers? You could of course combine all the ideas so far and you will end up with a very long and almost unreadable search pattern, or you start combining several regular expression functions. Think about it: Why put all the search patterns into one function? Why not split those into several steps like "check for a valid decimal" and "check for sign".
I'll just use another SELECT to show what I want to do:
WITH t AS (SELECT '0' col1
FROM dual
UNION
SELECT '0.'
FROM dual
UNION
SELECT '.0'
FROM dual
UNION
SELECT '0.0'
FROM dual
UNION
SELECT '-1.0'
FROM dual
UNION
SELECT '.1-'
FROM dual
UNION
SELECT '.'
FROM dual
UNION
SELECT '-1.1-'
FROM dual
SELECT t.*
FROM t
;From this select, the only rows I need to find are those with the column values "." and "-1.1-". I'll start this with a check for valid signs. Since I want to combine this with the check for valid decimals, I'll first try to extract a substring with valid signs through the REGEXP_SUBSTR function:
NVL(REGEXP_SUBSTR(t.col1, '^([+-]?[^+-]+|[^+-]+[+-]?)$'), ' ')Remember the OR operator and the matching character collections? But several "^"? Some of the meta characters inside a search pattern can have different meanings, depending on their positions and combination with other meta characters. In this case, the pattern translates into: from the beginning of the string search for "+" or "-" followed by at least another character that is not "+" or "-". The second pattern after the "|" OR operator does the same for a sign at the end of the string.
This only checks for a sign but not if there also only digits and a decimal point inside the string. If the search string fails, for example when we have more than one sign like in the "-1.1-", the function returns NULL. NULL and LIKE don't go together very well, so we'll just add NVL with a default value that tells the LIKE to ignore this string, in this case a space.
All we have to do now is to combine the check for the sign and the check for a valid decimal number, but don't forget an option for the signs at the beginning or end of the string, otherwise your second check will fail on the signed decimals. Are you ready?
Does your solution look a bit like this?
WHERE NOT REGEXP_LIKE(NVL(REGEXP_SUBSTR(t.col1,
'^([+-]?[^+-]+|[^+-]+[+-]?)$'),
'^[+-]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)[+-]?$'
)Now the optional sign checks in the REGEXP_LIKE argument can be added to both ends, since the SUBSTR won't allow any string with signs on both ends. Thinking in regular expression again.
Continued in Introduction to regular expressions ... continued.
C.
Fixed some embarrassing typos ... and mistakes.
cdExcellent write up CD. Very nice indeed. Hopefully you'll be completing parts 2 and 3 some time soon. And with any luck, your article will encourage others to do the same....I know there's a few I'd like to see and a few I'd like to have a go at writing too :-)
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I am attempting to add text to my pdf using the add or edit text tool in Acrobat Pro X. However, the dialog box that allows me to change fonts, size, color, etc. has disappeared. Does anyone know how to make the dialog box come back?
Hi,
This is a new problem. It started about 2 days before I posted the question. I have not updated my Acrobat recently and I was previously able to use the dialog box with no problem. I have tried in several different documents and the dialog box is not showing up.
Thanks for your assistance.
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