How do you append to a "string" type field?

ABAPers,
I am trying to understand how to append values to a "string" data type in an efficient way. One way to append to a string is using "concatenate" feature.
data: myRetVal type string.
DO
CONCATENATE myRetVal ',' myNewData INTO myRetVal.
ENDDO.
However, CONCATENMATE is not efficient in this scenario. Each time you call it, myRetVal gets copied into myRetVal all over. As the string grows, this statement will execute slower and slower.
The other option I thought is to use offset mechanism.
MOVE myNewData to myRetVal+myRetValLen.
However, it appears "string" and "xstring" type fields do not support offset and length operations.
Is there a third choice that I am missing?
Thank you in advance for your help.
Pradeep

There is no such operator.
But if just using literals, you can use the &, like this.
data: string type string.
string = 'This is the first part ' & 'This is the second part'.
Again, this will not work with variables.
Regards,
Rich Heilman

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Re: How do you create and use "common" type classes?

Hi,
You have 2 potential solutions in your case :
1- Sub-class TextNullable class of Framework and add your methods in the
sub-class.
This is the way Domain class work. Only Nullable classes are sub-classable.
This is usefull for Data Dictionary.
The code will be located in any partition that uses or references the supplier
plan.
2- Put your add on code on a specific class and instanciate it in your user
classes (client or server).
You could also use interface for a better conception if needed. The code will
also be in any partition that uses or references the supplier plan where your
add on class is located.
If you don't want that code to be on each partition, you could use libraries :
configure as library the utility plan where is your add-on class.
You can find an example of the second case (using a QuickSort class,
GenericArray add-on) with the "QuickSort & List" sample on my personal site
http://perso.club-internet.fr/dnguyen/
Hope this helps,
Daniel Nguyen
Freelance Forte Consultant
http://perso.club-internet.fr/dnguyen/
Robinson, Richard a écrit:
I'm relatively new to forte and I'd like to know how can you handle utility
type classes that you want to use through out your application? Ideally
what I want is a static class with static methods.
Let's say that I have a StringUtil class that has a bunch of methods for
manipulating strings.
My problem is that we have code that runs on the client and code that runs
on the server. Both areas could use the StringUtil class, but from what I
understand, I have to create StringUtil in a plan and then create a server
object of type StringUtil. The server object will eventually get assigned
to a partition. That's not good since I really want the server object to
physically reside at the server end and at the client end. (Actually, I
don't want a server object, I just want to invoke a static method of a
static class).
Any clues on how to solve this problem would be appreciated.
Also, what is the url at Sage-it that has a summary of all emails that have
been posted to [email protected]? Perhaps this question has been
answered previously.
Thanks in advance
To unsubscribe, email '[email protected]' with
'unsubscribe forte-users' as the body of the message.
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Hi Richard,
Your question about "utility classes" brings up a number of issues, all of
which are important to long-term success with Forte.
There is no such thing as a static method (method that is associated with a
class but without an implicit object reference - this/self/me "pointer") in
TOOL, nor is there such thing as a global method (method not associated
with a class at all). This is in contrast to C++, which has both, and
Java, which has static methods, but not global classes. Frequently, Forte
developers will write code like this:
result, num : double;
// get initial value for num....
tmpDoubleData : DoubleData = new;
tmpDoubleData.DoubleValue = num;
result = tmpDoubleData.Sqrt().DoubleValue;
tmpDoubleData = NIL; // send a hint to the garbage collector
in places where a C++ programmer would write:
double result, num;
// get initial value for num....
result = Math::Sqrt(num);
or a Java programmer would write:
double result, num;
// get initial value for num....
result = Math.sqrt(num);
The result of this is that you end up allocating an extra object now and
then. In practice, this is not a big deal memory-wise. If you have a
server that is getting a lot of hits, or if you are doing some intense
processing, then you could pre-allocate and reuse the data object. Note
that optimization has its own issues, so you should start by allocating
only when you need the object.
If you are looking for a StringUtil class, then you will want to use an
instance of TextData or TextNullable. If you are looking to add methods,
you could subclass from TextNullable, and add methods. Note that you will
still have to instantiate an object and call methods on that object.
The next issue you raise is where the object resides. As long as you do
not have an anchored object, you will always have a copy of an object on a
partition. If you do not pass the object in a call to another partition,
the object never leaves. If you pass the object to another partition, then
the other partition will have its own copy of the object. This means that
the client and the server will have their own copies, which is the effect
you are looking for.
Some developers new to Forte will try to get around the lack of global
methods in TOOL by creating a user-visible service object and then calling
methods on it. If you have a general utility, like string handling, this
is a bad idea, since a service object can reside only on a single
partition.
Summary:
* You may find everything you want in TextData.
* Unless you anchor the object, the instance will reside where you
intuitively expect it.
* To patch over the lack of static methods in TOOL, simply allocate an
instance when required.
Feel free to email me if you have more questions on this.
At the bottom of each message that goes through the mailing list server,
the address for the list archive is printed:
http://pinehurst.sageit.com/listarchive/.
Good Luck,
CSB
-----Original Message-----
From: Robinson, Richard
Sent: Tuesday, March 02, 1999 5:44 PM
To: '[email protected]'
Subject: How do you create and use "common" type classes?
I'm relatively new to forte and I'd like to know how can you handle utility
type classes that you want to use through out your application? Ideally
what I want is a static class with static methods.
Let's say that I have a StringUtil class that has a bunch of methods for
manipulating strings.
My problem is that we have code that runs on the client and code that runs
on the server. Both areas could use the StringUtil class, but from what I
understand, I have to create StringUtil in a plan and then create a server
object of type StringUtil. The server object will eventually get assigned
to a partition. That's not good since I really want the server object to
physically reside at the server end and at the client end. (Actually, I
don't want a server object, I just want to invoke a static method of a
static class).
Any clues on how to solve this problem would be appreciated.
Also, what is the url at Sage-it that has a summary of all emails that have
been posted to [email protected]? Perhaps this question has been
answered previously.
Thanks in advance

How long charactors can stored in 'STRING' type?

HI
I'm just curious how long charactors can stored in 'string' type.
and if there is limit number to store what kind of type is unlimited length type?
and is it possible send a parameter page to page with 'form' 'post' way unlimited length of string?
and is there any type of DB field which is save last number of records automatically when one record is inserted like MANDT?
MANDT is client number though.
Regards.

Here is what ABAP key word documentation says about string
The elementary data type STRING is similar to data type C and refers to a variable-length string. Accordingly, the elementary data type XSTRING is similar to data type X and refers to a variable-length byte sequence.
In contrast to a C or X field, the length of a string is not static but variable and adjusts itself to the current field content at runtime. Dynamic memory management is used internally. Strings can have any length.
The initial value of a string is an empty string with length 0. A structure containing a string is seen as deep. A deep structure cannot be used like a C field. Strings can be displayed in the ABAP Debugger and used in the ABAP Dictionary.
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As far as I know the limit is 4 Giga Byte which equals more or less no limit. I donnot expect that you will meet this limit in practice. Its very likely that will run out of memory before you reach this limit.
In short there is no limit to the data stored in STRING var but the system memory has a limit....
This can be proved with the below program:
For the program system dumps with mess.
"Unable to fulfil request for 127683972 bytes of memory space. "
here's the test prog.:
TABLES ekko.
DATA testmax TYPE string.
DATA z(16) TYPE i.
SELECT * FROM ekko.
CONCATENATE testmax ekko INTO testmax.
z = strlen( testmax ).
IF z = 63841496.
BREAK-POINT.
ENDIF.
ENDSELECT.

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Good afternoon everyone...
THE PROBLEM: Why doesn’t a line with multiple fields WRAP?
HYPOTHETICAL EXAMPLE/WHAT I”D LIKE TO SEE
If I have 2 fields on a line (this is now a hypothetical example and nothing to do with my actual report)….let’s call them field A and field B. And if field A has values of all ‘X’ and field B has values of all ‘Y’…then….the normal case would be (ignore dots – only for spacing):
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And similarly….if B is extra long, can the line print as:
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XXXXXXXXXXXXXXXXXXX YYYYYYYYYYYYYYYYYYYYYYYYYYY
YYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
I don’t want the case where B is long and I get:
A………………… …B…
XXXXXXXXXXXXXXXXX YYYYYYYYYYYYYYYYYYYYYY
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I can see how you can wrap an individual field like that…but how can you WRAP a line of[b] fields within the frame so it wraps to the BEGINNING of the frame on next line?
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Tony Calabrese.

Steve,
you gain 1 thing, but you lose something else!
This thing is SO frustrating!
Hey Steve! Good afternoon.
I've done as you suggested....I have a long text boilerplate item - the only 1 on the line...and it has all the column in it.
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&col1 &col2 &col3 &col4 &col5 etc etc etc
And the line expands nicely to each field's requirements.
And when it gets to the right page boundary...it WRAPS to the next line! Beautiful!!!
The only thing is that...when I had individual fields across the line I was able to create format triggers for those fields. And in doing so I was able to reduce the font and change the justification. I had to do that because some of the fields had to appear superscripted.
So I wanted something like (ignore the dots):
...................................ppppp
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I can't see how I can do this with a single TEXT field containing all the &COL values.
Have you ever come across anything like this?
Thankyou again,
Tony Calabrese 12/4/2007

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