How check variable in field-symbol?

Hi
I have in my report following code:
data: l_auth_pai type zps_auth_pai,
         name(20)   type c.
   field-symbols: <rep_var> type any.
       CONCATENATE 'pai_' l_auth_pai-stru_name into name.
        assign (name) TO <rep_var>.
Could You suggest me a way, in which I can check:
1. if in report a variable with name "name' exist/is declared
2.if variable with name "name" is an internal table or a line
Thx in advance
J.S.
Edited by: John Smith on Oct 17, 2008 12:46 PM

Hi,
data: l_auth_pai type zps_auth_pai,
         name(20)   type c.
   field-symbols: <rep_var> type any.
       CONCATENATE 'pai_' l_auth_pai-stru_name into name.
        assign (name) TO <rep_var>.
assume that there is a variable pai_matnr and its value is 'TEST'
in your case I assume that l_auth_pai-stru_name contains value 'MATNR'
then statement
assign (name) TO <rep_var>
will cause field-symbol <rep_var> to reference variable pai_matnr
it could be structure or internal table depends on how it is declared.
Regards,
Vishal

Similar Messages

HOW CAN I SEND FIELD SYMBOL TO SUBROUTINE

HAI,
         HOW CAN I SEND FIELD SYMBOL TO SUBROUTINE
         HOW CAN I COME BACK FROM 5TH INTERACTIVE REROT TO 2ND
INTERACTIVE REPORT.
THANK YOU.
ASHOK

Hi
Write some code in the program to come to 2nd list from 5th list
if sy-lsind = 5.
   sy-lsind = 2.
endif.
for field symbols see the doc
Field Symbols
Field symbols are placeholders or symbolic names for other fields. They do not physically reserve space for a field, but point to its contents. A field symbol cam point to any data object. The data object to which a field symbol points is assigned to it after it has been declared in the program.
Whenever you address a field symbol in a program, you are addressing the field that is assigned to the field symbol. After successful assignment, there is no difference in ABAP whether you reference the field symbol or the field itself. You must assign a field to each field symbol before you can address the latter in programs.
Field symbols are similar to dereferenced pointers in C (that is, pointers to which the content operator * is applied). However, the only real equivalent of pointers in ABAP, that is, variables that contain a memory address (reference) and that can be used without the contents operator, are reference variables in ABAP Objects.
All operations programmed with field symbols are applied to the field assigned to it. For example, a MOVE statement between two field symbols moves the contents of the field assigned to the first field symbol to the field assigned to the second field symbol. The field symbols themselves point to the same fields after the MOVE statement as they did before.
You can create field symbols either without or with type specifications. If you do not specify a type, the field symbol inherits all of the technical attributes of the field assigned to it. If you do specify a type, the system checks the compatibility of the field symbol and the field you are assigning to it during the ASSIGN statement.
Field symbols provide greater flexibility when you address data objects:
If you want to process sections of fields, you can specify the offset and length of the field dynamically.
You can assign one field symbol to another, which allows you to address parts of fields.
Assignments to field symbols may extend beyond field boundaries. This allows you to address regular sequences of fields in memory efficiently.
You can also force a field symbol to take different technical attributes from those of the field assigned to it.
The flexibility of field symbols provides elegant solutions to certain problems. On the other hand, it does mean that errors can easily occur. Since fields are not assigned to field symbols until runtime, the effectiveness of syntax and security checks is very limited for operations involving field symbols. This can lead to runtime errors or incorrect data assignments.
While runtime errors indicate an obvious problem, incorrect data assignments are dangerous because they can be very difficult to detect. For this reason, you should only use field symbols if you cannot achieve the same result using other ABAP statements.
For example, you may want to process part of a string where the offset and length depend on the contents of the field. You could use field symbols in this case. However, since the MOVE statement also supports variable offset and length specifications, you should use it instead. The MOVE statement (with your own auxiliary variables if required) is much safer than using field symbols, since it cannot address memory beyond the boundary of a field. However, field symbols may improve performance in some cases.
check the below links u will get the answers for your questions
http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb3860358411d1829f0000e829fbfe/content.htm
http://www.sts.tu-harburg.de/teaching/sap_r3/ABAP4/field_sy.htm
http://searchsap.techtarget.com/tip/1,289483,sid21_gci920484,00.html
Syntax Diagram
FIELD-SYMBOLS
Basic form
FIELD-SYMBOLS <fs>.
Extras:
1. ... TYPE type
2. ... TYPE REF TO cif
3. ... TYPE REF TO DATA
4. ... TYPE LINE OF type
5. ... LIKE s
6. ... LIKE LINE OF s
7. ... TYPE tabkind
8. ... STRUCTURE s DEFAULT wa
The syntax check performed in an ABAP Objects context is stricter than in other ABAP areas. See Cannot Use Untyped Field Symbols ad Cannot Use Field Symbols as Components of Classes.
Effect
This statement declares a symbolic field called <fs>. At runtime, you can assign a concrete field to the field symbol using ASSIGN. All operations performed with the field symbol then directly affect the field assigned to it.
You can only use one of the additions.
Example
Output aircraft type from the table SFLIGHT using a field symbol:
FIELD-SYMBOLS <PT> TYPE ANY.
DATA SFLIGHT_WA TYPE SFLIGHT.
ASSIGN SFLIGHT_WA-PLANETYPE TO <PT>.
WRITE <PT>.
Addition 1
... TYPE type
Addition 2
... TYPE REF TO cif
Addition 3
... TYPE REF TO DATA
Addition 4
... TYPE LINE OF type
Addition 5
... LIKE s
Addition 6
... LIKE LINE OF s
Addition 7
... TYPE tabkind
Effect
You can define the type of the field symbol using additions 2 to 7 (just as you can for FORM parameters (compare Defining the Type of Subroutine Parameters). When you use the ASSIGN statement, the system carries out the same type checks as for USING parameters of FORMs.
This addition is not allowed in an ABAP Objects context. See Cannot Use Obsolete Casting for FIELD SYMBOLS.
In some cases, the syntax rules that apply to Unicode programs are different than those for non-Unicode programs. See Defining Types Using STRUCTURE.
Effect
Assigns any (internal) field string or structure to the field symbol from the ABAP Dictionary (s). All fields of the structure can be addressed by name: <fs>-fieldname. The structured field symbol points initially to the work area wa specified after DEFAULT.
The work area wa must be at least as long as the structure s. If s contains fields of the type I or F, wa should have the structure s or at least begin in that way, since otherwise alignment problems may occur.
Example
Address components of the flight bookings table SBOOK using a field symbol:
DATA SBOOK_WA LIKE SBOOK.
FIELD-SYMBOLS <SB> STRUCTURE SBOOK
DEFAULT SBOOK_WA.
WRITE: <SB>-BOOKID, <SB>-FLDATE.
Related
ASSIGN, DATA
Additional help
Declaring Field Symbols
Reward points if useful
Regards
Anji

Accessing the variable in field symbol of nested internal table

Hi,
I am unable to access the variable in field symbol.
The data in field symbol has nested structure. We need to access a variable in nested structure.
Please find the code below:
      LOOP AT <i_fincorp> into <fs_fincorp>.
        l_madefor = <FS_FINCORP>-data_UI-ZZ0010.
      ENDLOOP.
datatype of <i_fincorp> is type any table and <fs_fincorp> is type any.
there is a structure 'data_ui' in <i_fincorp> and we need value of field 'ZZ0010' in data_ui structure.
But, we are getting syntax error for statement in loop stating "There is no component like 'data_ui' in <fs_fincorp>".
Can anyone please help me solving this issue.
Regards,
Santosh

So simply access it dynamically
data: nested_field type c length 50.
field-symbols <nested_field> type any.
"build the nested field name dynamically
concatenate
       'DATA_UI'    "first give structure name
       'ZZ0010' "then give field name (all in uppercase!)
into nested_field
separated by '-'. "now you have DATA_UI-ZZ0010
"so assing this nested field
LOOP AT <i_fincorp> into <fs_fincorp>.
   assign component (nested_field) of structure <fs_fincorp> into <nested_field>.
ENDLOOP.
Regards
Marcin

How to change the Field Symbol, so Adobe Forms takes it as a Table?

Hi guys,
I created an Field Symbol, in a Interface which I use for Adobe Forms. The type of the Field Symbol is STANDARD TABLE, and this field symbol I fill with data from another program.
But the problem is that in adobe forms, this Field Symbol is taken as TEXT FIELD and not as Table... and this shows me a Dump because it can't convert Internal Table to type C (the dump is like that).
What I need, is how to change the Field Symbol, so Adobe Forms takes it as a Table?
I looked at Adobe Form, and found this:
The Type Category of the Field Symbol is DICTIONARY TYPE and I think I need to change it to Internal Table as shown in the right picture.
Does someone have any idea?

Hello Taly,
To what i understand your requirement, you need to pass data from Field symbol to internal table in Adobe form.
You have done it correct partially. I have replicated your scenario and steps are below -
1) Create a Z structure
2) Create Z Table Type
3) Create Adobe Interface with Table & Field Symbol. Also do coding as shown to assign the internal table populated in driver program to filed symbol.
4) Design Form as -
5) Code driver as -
*& Report ZR_AF_FS_1
REPORT zr_af_fs_1.
DATA: fm_name           TYPE rs38l_fnam,
       fp_docparams      TYPE sfpdocparams,
       fp_outputparams   TYPE sfpoutputparams,
       it_kna1           TYPE ztt_fs_1.
* Sets the output parameters and opens the spool job
CALL FUNCTION 'FP_JOB_OPEN'                   "& Form Processing: Call Form
   CHANGING
     ie_outputparams = fp_outputparams
   EXCEPTIONS
     cancel          = 1
     usage_error     = 2
     system_error    = 3
     internal_error = 4
     OTHERS          = 5.
IF sy-subrc <> 0.
*            <error handling>
ENDIF.
*&---- Get the name of the generated function module
CALL FUNCTION 'FP_FUNCTION_MODULE_NAME'           "& Form Processing Generation
   EXPORTING
     i_name     = 'ZAF_FS_1'
   IMPORTING
     e_funcname = fm_name.
IF sy-subrc <> 0.
* <error handling>
ENDIF.
*-- Fetch the Data and store it in the Internal Table
SELECT kunnr name1 name2 adrnr FROM kna1 INTO TABLE it_kna1 UP TO 15 ROWS.
* Language and country setting (here US as an example)
fp_docparams-langu   = 'E'.
fp_docparams-country = 'US'.
*&--- Call the generated function module
CALL FUNCTION fm_name
   EXPORTING
     /1bcdwb/docparams        = fp_docparams
      it_data                   = it_kna1
*    IMPORTING
*     /1BCDWB/FORMOUTPUT       =
   EXCEPTIONS
     usage_error           = 1
     system_error          = 2
     internal_error           = 3.
IF sy-subrc <> 0.
* <error handling>
ENDIF.
*&---- Close the spool job
CALL FUNCTION 'FP_JOB_CLOSE'
*    IMPORTING
*     E_RESULT             =
   EXCEPTIONS
     usage_error           = 1
     system_error          = 2
     internal_error        = 3
     OTHERS               = 4.
IF sy-subrc <> 0.
*            <error handling>
ENDIF.
6) Output -
BR.

How to read dynamic field symbol

hi all,
ASSIGN (tabname) TO <fs_tab>.
in above code i am passing dynamic table to fs_tab
can anyone tell me how can i read this field symbol........
in other words i want to read dynamic field symbols

Hi,
you could do without the field-symbols:
select from variable table
grtz,
Koen

How to initialize a field-symbols?

I have field-symbols structure <wa1>, <wa2>.
1. Supposed <wa1> has been assined value already, how can I copy content of <wa1> to <wa2>?
2. How to initialize <wa2>?
Thanks!

Hi,
Check this example..
field-symbols: <fs1>, <fs2>.
data: v_var1(10), v_var2(10).
v_var1 = 'ABC'.
v_var2 = 'DEF'.
assign v_var1 to <fs1>.
assign v_var2 to <fs2>.
write: / 'BEFORE...'.
write: / '<FS1> - ', <FS1>.
write: / '<FS2> - ', <FS2>.
<FS1> = <FS2>.
write: / 'AFTER...'.
write: / '<FS1> - ', <FS1>.
write: / '<FS2> - ', <FS2>.
CLEAR: <FS2>.
write: / 'AFTER CLEAR...'.
write: / '<FS1> - ', <FS1>.
write: / '<FS2> - ', <FS2>.
Thanks,
Naren

How to modify the field symbol

Hello Every1,
I have a internal table and field symbol with the below structure.
Data : begin of itab occurs 0,
           matnr like mara-matnr,
           ersda like mara-ersda,
       End   of itab.
FIELD-SYMBOLS: <Matnr>    TYPE STANDARD TABLE.
I have the field symbol with 10 records similar to the structure of itab. (Only matnr is populated and date as initial). Now I need to transfer the date value from itab to the field symbol for the matching matnr.
Please let me know how to do it.
Thanks,
Siva.

Sivaprakash,
To my knowledge, a field-symbol cannot hold values on its own. It refers to a field or a table and work directly with the values.
Your scenario cannot be achieved unless there is another internal table besides itab.
Create a field-symbol of type itab2 and compare matnr with itab-matnr.
If a record is found then move the date field to <fs>.
Your code may look like this.
loop at itab2 assigning <fs>.
   read table itab into wa_itab with key matnr = <fs>-matnr.
if sy-subrc = 0.
<fs>-date = wa_itab-date.
endif.
endloop
Thanks,

How to use different field symbols to append data in a loop

Hi experts!
I have to loop over a itab and I want to save different into one table.
See my code below:
DATA: l_hours        TYPE i,
      grfk_ok_code    TYPE sy-ucomm,
      grfk_values     TYPE TABLE OF GPRVAL WITH HEADER LINE,
      grfk_coltxt     TYPE TABLE OF GPRTXT WITH HEADER LINE,
      wa_ztab         TYPE zqm_chq_prueflos,
      l_index      TYPE n,
      l_field      TYPE string,
      l_line_check TYPE string
FIELD-SYMBOLS:
      <fs_0102>   TYPE ANY,
      <fs_0304>   TYPE ANY,
      <fs_0506>   TYPE ANY,
      <fs_grenze> TYPE ANY
REFRESH: grfk_values.
CLEAR:   l_hours.
LOOP AT ztab INTO wa_ztab.
AT NEW qase_serialnr.
    CLEAR: l_line_check.
    IF wa_ztab-qase_serialnr CS '-01'
    OR wa_ztab-qase_serialnr CS '-02'.
        grfk_values-rowtxt = 'gelötet'.
        l_line_check = '0102'.
    ELSEIF wa_ztab-qase_serialnr CS '-03'
    OR     wa_ztab-qase_serialnr CS '-04'.
        grfk_values-rowtxt = 'geglüht'.
        l_line_check = '0304'.
    ELSEIF wa_ztab-qase_serialnr CS '-05'
    OR     wa_ztab-qase_serialnr CS '-06'.
        grfk_values-rowtxt = 'unbehandelt'.
        l_line_check = '0506'.
    ELSE.
      grfk_values-rowtxt = 'serialnr_wrong'.
    ENDIF.
ENDAT.
***---------------------------------------------------->
AT NEW qapp_usern1.
*   X-axis: values are:0,50,100,...,400
    grfk_coltxt-coltxt = wa_ztab-qapp_usern1.
    SHIFT grfk_coltxt-coltxt LEFT DELETING LEADING '0'.
    APPEND grfk_coltxt.
    UNASSIGN <fs_grenze>.
    CLEAR: l_index, l_field.
    l_index = sy-tabix.
    CONCATENATE 'grfk_values-val' l_index INTO l_field.
    ASSIGN (l_field) TO <fs_grenze>.
    IF sy-subrc <> 0.
      EXIT.
    ENDIF.
    <fs_grenze> = 10.
    APPEND grfk_values.
ENDAT.
IF l_line_check = '0102'.
      UNASSIGN <fs_0102>.
      CLEAR: l_index, l_field.
      l_index = sy-tabix.
      CONCATENATE 'grfk_values-val' l_index INTO l_field.
      ASSIGN (l_field) TO <fs_0102>.
      IF sy-subrc <> 0.
        EXIT.
      ENDIF.
      <fs_0102> = wa_ztab-cf_dgp.
ELSEIF l_line_check = '0304'.
      UNASSIGN <fs_0304>.
      CLEAR: l_index, l_field.
      l_index = sy-tabix.
      CONCATENATE 'grfk_values-val' l_index INTO l_field.
      ASSIGN (l_field) TO <fs_0304>.
      IF sy-subrc <> 0.
        EXIT.
      ENDIF.
      <fs_0304> = wa_ztab-cf_dgp.
ELSEIF l_line_check = '0506'.
      UNASSIGN <fs_0506>.
      CLEAR: l_index, l_field.
      l_index = sy-tabix.
      CONCATENATE 'grfk_values-val' l_index INTO l_field.
      ASSIGN (l_field) TO <fs_0506>.
      IF sy-subrc <> 0.
        EXIT.
      ENDIF.
      <fs_0506> = wa_ztab-cf_dgp.
ENDIF.
ENDLOOP.
My goal should be to fill the graphic with 4 Lines:
1 is boarderline.
2-3 are the lines with the looped values in "ztab"
Do I have to use references to write the values in into different rows of internal table "grfk_values"????
With this code I want to fill the itab which I need for the GFW_PRES_SHOW function.
The table I have to commit has the following structure:
-rowtxt
-val1
-val2
-val31
EDIT:
My current output are 2 lines the first has value 0 for each point and the second shows the correct values... The boarder which always should have value 10 is completly not shown.

hopen this will help
report zrich_0001 .
data: begin of itab1 occurs 0,
      fld1(10) type c,
      fld2(10) type c,
      fld3(10) type c,
      end of itab1.
data: begin of itab2 occurs 0,
    flda(10) type c,
    fldb(10) type c,
    fldc(10) type c,
    end of itab2.
field-symbols: <fs_table> type table,
               <fs_wa>,
               <fs>.
data: mod_field(10) type c.
itab1-fld1 = '1'. itab1-fld2 = '2'. itab1-fld3 = '3'. append itab1.
itab1-fld1 = '4'. itab1-fld2 = '5'. itab1-fld3 = '6'. append itab1.
itab2-flda = 'A'. itab2-fldb = 'B'. itab2-fldc = 'C'. append itab2.
itab2-flda = 'D'. itab2-fldb = 'E'. itab2-fldc = 'F'. append itab2.
assign itab1[] to <fs_table>.
assign itab1 to <fs_wa>.
mod_field = 'FLD2'.
perform modify_table.
perform write_table.
assign itab2[] to <fs_table>.
assign itab2 to <fs_wa>.
mod_field = 'FLDC'.
perform modify_table.
perform write_table.
      FORM modify_table                                             *
form modify_table.
loop at <fs_table> into <fs_wa>.
    assign component mod_field of structure <fs_wa> to <fs>.
    <fs> = 'Modified'.
    modify <fs_table> from <fs_wa>.
endloop.
endform.
      FORM write_table                                             *
form write_table.
loop at <fs_table> into <fs_wa>.
    do.
      assign component sy-index of structure <fs_wa> to <fs>.
      if sy-subrc <> 0.
        exit.
      endif.
      if sy-index = 1.
        write:/ <fs>.
      else.
        write: <fs>.
      endif.
    enddo.
endloop.
endform.
regards
navjot
reward points if helpfull

How to move field symbol internal table to internal table with header line?

Dear all,
hi...hereby i would like to ask how i can move field symbol internal table to a internal table?
as i know field symbol internal table is without header line..
so, may i know how to do this....to move field symbol internal table to internal table which consist of header line and field and record will same as field symbol internal table...in additional, my field symbol internal table is dynamic table mean everytime will have flexible columns..?
Please advise...
Thanks
Regard,
ToToRo.
Edited by: @ToToRo@ on Aug 20, 2009 6:16 AM

Hello,
Try this way:
If both the type of internal tables are same then you can directly assign dynamic internal table to static internal table.
itab = <itab>.
Suppose you have field symbol internal table <itab> which is different in structure from ITAB.
Now, you can create <wa> as follow:
FIELD-SYMBOLS <wa>.
DATA wa TYPE REF TO DATA.
CREATE DATA wa TYPE LINE OF <itab>.
ASSIGN wa->* to <wa>.
This way your work area is read.
Using [ASSIGN COMPONENT|http://help.sap.com/saphelp_nw04/helpdata/EN/fc/eb3923358411d1829f0000e829fbfe/content.htm] syntax you can read required component of <wa>.
Finally you can use that value to load static internal table.
You can also refer to my thread on [Dynamic table|Re: Creating Dynamic table].
Hope this helps!
Thanks,
Augustin.
Edited by: Augustarian on Aug 20, 2009 10:06 AM

Better alternative to header lines, use of logical database, field-symbols

Hello experts,
I am wondering if theres a better and faster alternative than declaring a header line for an itab. are work areas faster?
What is the use of logical database? can you please give me an example on how to use it in reports.
how do I use field-symbols? I am confused on how it works.
P.S. I recently installed SAP netweaver preview abap edition
in my home PC and I am wondering if I could practice BDC, user exits, etc. If so, how?
Again, thanks for all your help since I'm kinda new to ABAP.

I always use this...It uses header lines, but at least is smaller -:)
<b>DATA: BEGIN OF MY_TAB TYPE STANDARD TABLE OF BKPF WITH HEADER LINE.</b>
For logical databases, you can check my blog...I always use LDB for HR programs -:)
<a href="/people/alvaro.tejadagalindo/blog/2006/02/19/how-to-deal-with-hr-payroll-reports:///people/alvaro.tejadagalindo/blog/2006/02/19/how-to-deal-with-hr-payroll-reports
LDB's provides a lot of information, because they gather it from a lot of different tables...
A Field-Symbols is like a pointer in C++, like an alias for a variable...Here's a small example...
REPORT Z_ATG_DUMMY.
FIELD-SYMBOLS: <F1>, <F2> TYPE I.
DATA: TEXT(20) TYPE C VALUE 'Hello, how are you?',
      NUM TYPE I VALUE 5,
      BEGIN OF LINE1,
      COL1 TYPE F VALUE '1.1e+10',
      COL2 TYPE I VALUE '1234',
      END OF LINE1,
      LINE2 LIKE LINE1.
ASSIGN TEXT TO <F1>.
ASSIGN NUM TO <F2>.
DESCRIBE FIELD <F1> LENGTH <F2>.
TEXT = 'CHAU'.
WRITE: / <F1>, 'has length', NUM.
WRITE: / TEXT, 'has length', NUM.
ASSIGN LINE1 TO <F1>.
ASSIGN LINE2-COL2 TO <F2>.
MOVE <F1> TO LINE2.
ASSIGN 'LINE2-COL2 =' TO <F1>.
I just can't install SAPNWSP...I only got MiniSap...But I got all the development enviorment...Don't know about the User-Exits...Actually I don't think so...Because those "mini" systems doesn't come with any functional module.
Greetings,
Blag.

Error in drill down of RRI- Field Symbol not assigned

Dear all,
I am trying to call a SAP transaction on click of the jump target. I have created the jump target in the following way ..let me know if I am wrong ..
Goto RBBS transaction . Specifed the sender report as 0SD_C01/0SD_C01_Q025 (Sales Volume Analysis) and target as r/3 client 210 and specifed the transaction Va01 as target.
But when I executed the report and did a right click ..on the context menu I coudl see the desription of the Jump target I have created and upon clicking I received a error ..field symbol not assigned ..
Can any let me know the cause of the error ..and how to resolve.. do i need to give any extra parameters while creating jump target..
Thanks,
Gupta

Hello Gayathri,
One you got the dump you can select debugger button in top-left corner screen.
That will take you to the execution snap shot where you can check all the field symbols and find out which one is not
assigned. accordingly you can find out what is missing on input side to avoid this dump.
Hope this helps!
Thanks,
Augustin.

Field-symbol not assigned

Hello,
I speak only a bit so I wait that you can understandme.
I have a field-symbol that is assigned to a component of a structure but when I use the field-symbol I recived a error message that say me "field-symbol is not assigned".
field-symbols <ubi> type any.
campo = 'UBIORI'.
assign component campo of structure
t_cuantos to <ubi>.
Thank you very much.

H,
Put a check as follows:-
field-symbols <ubi> type any.
campo = 'UBIORI'.
assign component campo of structure
t_cuantos to <ubi>.
if <ubi> is assigned.
* do further processing here
endif.
How is the structure t_cuantos defined?
Is it having a field named UBIORI?
t_cuantos should be a workarea(structure) and not an internal table.
Check the points and reply.
Regards,
Ankur Parab

"Read table" and field symbols

Hello all,
I have a (hopefully simple) question. Let's suppose I want to do the following:
loop at itab1 assigning <fs1>.
read table itab2 assigning <fs2> with table key <fs1>-field1.
if sy-subrc eq 0.
    move <fs2>-field1 to ls_out-field1.
endif.
read table itab3 assigning <fs3> with table key <fs1>-field2.
if sy-subrc eq 0.
    move <fs3>-field1 to ls_out-field2.
endif.
endloop.
It's also possible to do the following instead:
loop at itab1 assigning <fs1>.
unassign: <fs2>,
            <fs3>.
read table itab2 assigning <fs2> with table key <fs1>-field1.
read table itab3 assigning <fs3> with table key <fs1>-field2.
if <fs2> is assigned.
    move <fs2>-field1 to ls_out-field1.
endif.
if <fs3> is assigned.
    move <fs3>-field1 to ls_out-field2.
endif.
endloop.
My question is: is it "better" to check sy-subrc after each read, and then do a move statement within that if statement, or is it better to check whether the field symbol is assigned each time I want to fill in a field and read everything at the same time?
I'm only really concerned about the case where you don't want to drop out of the loop after the read (so if the read fails you just don't fill any data in). I'm also discounting potential human error (otherwise the sy-subrc method wins hands-down).

Just to close this one (albeit somewhat belatedly). I asked Harry Dietz (the ABAP Performance blogging fella) what he would suggest, and he says sy-subrc all the way. Checking that an integer is zero is considerably faster than checking for the assignment, or otherwise, of a field symbol. Furthermore, whilst the field symbol method has the potential to be faster than the sy-subrc method given some compiler optimizations, unfortunately these optimizations don't exist in the ABAP compiler - they're there in the Java compiler though! Shame really. Apparently the ABAP compiler is a pretty simple beast.
Anyway - thanks Harry for clearing this one up!

Field-symbols v/s Object references in OO-ABAP

Hi,
can anyone please tell me what is the difference between using field-symbols and object references in OO ABAP? Is there a specific need for field-symbols now that we have references?
Thanks.
Shakul.

Hi ,
Please note that both Field symbols & Object References are different .
You can use Field symbols during the following situations
1) When you want to modify the value of internal table, the field symbol would be useful since you do not have to use any Modify statement as in case of work area. The Field symbol works as a pointer and any changes to the field symbol will directly affect the value of the internal table
2) Make sure that you do not reassign the field symbol within a Loop iteration
3) Field symbols are useful when you work with dynamic internal tables ( tables whose structure is determined during run time)
4) After Read an internal table ( Read itab...) into a Field symbol, make sure you do a Sy-subrc check or check if the field symbol is assigned.IF not this will give you a run time error
You can use Object References while creating an object to a class. They are instances of a class.
Thanks,
Chakram Govindarajan

Can I verify a field-symbol using its component name?

Hello experts,
I am looping at my field-symbol and I need to know what are its component name.
I need to create an IF or CASE statement checking whether the field-symbol's
component name is equal to that of the value that I declared. I want to do
something like this:
LOOP AT <fs_dyntable> ASSIGNING <wa_dyntable>.
ASSIGN COMPONENT sy-index OF STRUCTURE <wa_dyntable>
        TO <component>.
        IF sy-subrc <> 0.
          EXIT.
        ENDIF.
if component name = '2000'.
    condition...
elseif component name = '1999'.
    condition...
elseif component name = '1998'.
    condition...
endif.
endloop.
Again, thank you guys and take care!

Hi,
I am not clear on your doubt , but you can use field-symbol fields like below:
* if <component>-fld1 = '2000'.
condition...
elseif <component>-fld1 = '1999'.
condition...
elseif <component>-fld1 = '1998'.
condition...
endif.
endloop.
LOOP AT x_table ASSIGNING <wa_table>.
IF <wa_table>-fld1 EQ 100.
-----your code
ENDIF.
ENDLOOP.
Regards
Appana

How check variable in field-symbol?

Similar Messages

Maybe you are looking for