Delete Reference for field symbol
Hi
i have thes code
FUNCTION Z_DEMO.
*"*"Local Interface:
*" IMPORTING
*" REFERENCE(INCLUDE_STRUCTURE) TYPE TABNAM
*" TABLES
*" DATA_PACKAGE_TA
DATA: it_data TYPE REF TO data.
FIELD-SYMBOLS: <fs_itab> TYPE STANDARD TABLE.
CREATE DATA it_data TYPE STANDARD TABLE OF (INCLUDE_STRUCTURE).
ASSIGN it_data->* TO <fs_itab>.
assign DATA_PACKAGE_TA[] to <fs_it_dp>.
sort <fs_itab> by ('COSTCENTER') ('CALMONTH') ('CURRENCY').
delete adjacent duplicates
from <fs_itab>
comparing ('COSTCENTER') ('CALMONTH') ('CURRENCY').
(1) Its workes good but it delete lines from DATA_PACKAGE_TA also how i can delete just from
the field symbol <fs_itab> and keep the itab without change ????
(2) How I can build an another itab like DATA_PACKAGE_TA ??????
Thanks and regardes .
hi!
instead of:
assign DATA_PACKAGE_TA[] to <fs_itab>.
just do like this:
<fs_itab>[] = DATA_PACKAGE_TA[].
then you can delete from <fs_itab> without deleting the other internal table.
Bye,
Andrew83.
Hope this help you.
Similar Messages
-
Header Line Logic for Field Symbols??
Hi Experts,
I have the logic
DATA: Itab TYPE REF TO DATA.
FIELD-SYMBOLS: <itab> TYPE STANDARD TABLE.
CREATE DATA Itab TYPE STANDARD TABLE OF (TABLE_NAME).
ASSIGN Itab->* TO <itab>.
Her I had done the dynamic logic
select (LT_FIELDS)
into corresponding fields of table <itab>
from (TABLE_NAME)
up to 100 rows
WHERE (LT_WHERE).
Now I am having all information in <itab>.
Now I want to take this headerline information of <itab> and populate the same to other structure??
How to take the <itab> as header line information by looping??Hi
see this and use
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.
Regards
ANJI -
Sample program for field symbol
hi,
I am fresher. I want sample program(code) for field symbol.http://www.sts.tu-harburg.de/teaching/sap_r3/ABAP4/field_sy.htm
TYPES: BEGIN OF line,
col1 TYPE c,
col2 TYPE c,
END OF line.
DATA: wa TYPE line,
itab TYPE HASHED TABLE OF line WITH UNIQUE KEY col1,
key(4) TYPE c VALUE 'COL1'.
FIELD-SYMBOLS <fs> TYPE ANY TABLE.
ASSIGN itab TO <fs>.
READ TABLE <fs> WITH TABLE KEY (key) = 'X' INTO wa.
The internal table ITAB is assigned to the generic field symbol <FS>, after which it is possible to address the table key of the field symbol dynamically. However, the static address
READ TABLE <fs> WITH TABLE KEY col1 = 'X' INTO wa.
is not possible syntactically, since the field symbol does not adopt the key of table ITAB until runtime. In the program, the type specification ANY TABLE only indicates that <FS> is a table. If the type had been ANY (or no type had been specified at all), even the specific internal table statement READ TABLE <FS> would not have been possible.
http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb387a358411d1829f0000e829fbfe/content.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/fc/eb387a358411d1829f0000e829fbfe/content.htm -
DATA_OFFSET_TOO_LARGE dump for field symbol assignment/offset
Hi,
I am getting a DATA_OFFSET_TOO_LARGE dump for field symbol assignment/offset.
Dump says, 'In the running program "ZTEST", the field "<WA_FINAL>" of the type "u" and length 2174 was to be accessed with the offset 2204. However, subfield accesses with an offset specification that is not smaller than the field length are not permitted.'
Here <WA_FINAL> have to be 'TYPE any' to avoid assignment conflicts later in the logic.
It's basically dumping at <WA_FINAL>+V_LEN(V_OFF) = WA_DATA-FIELD1.
Here V_LEN LIKE DD03L-LENG & V_OFF LIKE DD03L-LENG.
Please suggest how to get rid of this dump.
Regards,
Ritesh.The dump is very clear, your field is smaller than the offset.
The problem is most likely how you are calculating v_len and v_off.
You could change that, but there is probably an easier and faster way to do what you are trying there. Is <wa_final> something like a line from a file or what? -
Hi All,
I want to apply field symbol technique in my report. actually i have one internal table say i_itab.
it contains fileds like address1 address2 address3 address4 upto address5 . insted of writting each field i want to use field symbol which will increment the counter for field durine runtime. actually i want ot apply this logic for one of my finance report for calculation of periods values hsl01 to hsl16.
can any one give me the solution for how to do this?
thanks in advance
vinod p.Hello Vinod,
If you are trying like this:
CONCATENATE 'wa_remittance_dt-suppl_addr_line' l_cnt2 into l_v_field. " --> Incorrect
ASSIGN l_v_field to <l_v_fields>. " --> Incorrect
You are not assigning the memory area of wa_remittance_dt-suppl_addr_line1 to <l_v_fields>. You are assigning the memory area of l_v_field to <l_v_fields>. Because of this you are getting the blank value.
But if you try like this:
CONCATENATE 'suppl_addr_line' l_cnt2 into l_v_field. "Add this line
ASSIGN COMPONENT l_v_field OF STRUCTURE wa_remittance_dt TO <l_v_fields>.
You are assigning memory area of wa_remittance_dt-suppl_addr_line1 to <l_v_fields>. And after
<l_v_fields> = wa_i_address-l_addr
the value in wa_remittance_dt-suppl_addr_line1 will be changed to that in wa_i_address-l_addr.
I think this should be clear to you.
BR,
Suhas -
Problem in color a cell for field symbol table.
Hi guru's
when i'm trying to color a cell based on condition, getting the following error.
ERROR: the data object <line> has no structure and therefore no component called "cell_colour" .
providing my code here:
DATA: wa_cellcolor TYPE lvc_s_scol,
lv_index TYPE sy-tabix.
break satishkumarc.
LOOP AT <table> ASSIGNING <line>.
lv_index = sy-tabix.
ASSIGN COMPONENT 'COMPLIANCE' OF STRUCTURE <line> TO <field>.
IF <field> EQ 'YES'.
wa_cellcolor-fname = 'COMPLIANCE'.
wa_cellcolor-color-col = col_positive.
wa_cellcolor-color-int = 0.
wa_cellcolor-color-inv = 0.
ELSE.
wa_cellcolor-fname = 'COMPLIANCE'.
wa_cellcolor-color-col = col_negative.
wa_cellcolor-color-int = 0.
wa_cellcolor-color-inv = 0.
ENDIF.
APPEND wa_cellcolor TO <line>-cell_colour. " error line
MODIFY <table> FROM <line> INDEX lv_index TRANSPORTING cell_colour. " error line
CLEAR: wa_cellcolor.
ENDLOOP.
actually i know that <line>-cell_colour won't work. but i don't know how to achive this functionality .
could anybody please help me out in this.
Thanks in Advance.
regards
satish
thankhi ashish,
i'm using
field-symbols: <line> type any.
CREATE DATA mydata LIKE LINE OF <table>.
ASSIGN mydata->* TO <line>.
to make the structure. so i guess i cannot give the structure name while declaring <line>.
Thanks & regards
satish -
Find table reference for field FAEDT and ZINSZ
Hi all,
can anybody tell me the table name for field FAEDT and ZINSZ
Thks
ShaileshHi,
Try in this table J_3RFTAX_EXTRD
34th FAEDT and 88th ZINSZ
Regards
Bala Krishna -
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 -
Reg: Field Symbol and Data Reference
Hi,
What is the difference Between a FieldSymbol and Data Reference.
could anyone explain with an example the difference.
The Link I am Going Through ---> [SAP HELP|http://help.sap.com/saphelp_nw04/helpdata/en/fc/eb3860358411d1829f0000e829fbfe/frameset.htm]
I couldnt get a clear idea
regardsHi,
In ABAP/4 programs, field symbols are placeholders for existing fields. A field symbol does not physically reserve space for a field, but points to a field, which is not known until runtime of the program. Field symbols are comparable to the concept of pointers as used in the programming language C. In ABAP/4, however, there is no real equivalent to pointers in the sense of variables, which contain a memory address and can be used without the content operator. You can only work with the data object to which a field symbol points.
uF076 Concept of Field Symbols
Sometimes you only know which field you want to process, and how you want to process it, at runtime.
For this purpose, you can create field symbols in your program. At runtime, you can assign real fields to such field symbols. All operations, which you have programmed with the field symbol, are then carried out with the assigned field. After successful assignment, there is no difference in ABAP/4 whether you reference the field symbol or the field itself.
Field symbols can point to any data object in ABAP/4 and to structures defined in the ABAP/4 Dictionary.
You can create field symbols either without or with type specifications. In the first case, the field symbol adopts all the attributes of the assigned field. In the second case, the system checks during the assignment process whether the assigned field matches the type of the field symbol. Whichever applies, you must first assign a field to your field symbol before you can work with it in your program.
Field symbols provide some features that make them very flexible:
uF071 You can specify the offset and length of the assigned field as variables.
uF071 You can assign field symbols to other field symbols and even specify offset and length there.
uF071 Assignments to field symbols may extend beyond field boundaries. This allows effective access to regularly stored data.
uF071 You can force a field symbol to be of a different type and to have a different number of decimal places than the assigned field.
uF071 Field symbols may have a structure that you can use to point to individual components of structures.
Since you can assign data objects to field symbols which may not be known 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. Therefore, you should use field symbols only in cases where you are absolutely sure of what you are doing, or if there are no other ABAP/4 statements you can use to solve your problem. The advantage of field symbols is that they can improve response times in some cases.
uF076 Defining Field Symbols
uF0D8 Defining Field Symbols for Internal Fields
To define a field symbol for an internal data object, use the FIELD-SYMBOLS statement as follows:
Syntax-
FIELD-SYMBOLS <FS> [<type>].
This statement defines a field symbol <FS>.
for data reference follow this link
http://help.sap.com/saphelp_nw04s/helpdata/en/14/11e70b0c5c11d3b9350000e8353423/frameset.htm
Regards,
Flavya -
Field symbols as Table name and in where condition in a select statement
Hello All,
I have a scenario where I need to get user input on table name and old field value and new field value. Then based on user input, I need to select the record from the database. The column name for all the tables in question is different in the database, however there data type is the same and have same values.
I am not able to use a field symbol for comparing the old field value to fetch the relevant record in my where clause.
I cannnot loop through the entire table as it has 10 millilon records, please advice on how to add the where clause as field symbol as the table name is also dynamically assigned.
Here is my code:
DATA: TAB LIKE SY-TNAME,
TAB_COMP1 LIKE X031L-FIELDNAME,
TAB_COMP2 LIKE X031L-FIELDNAME,
NO_OF_FLD TYPE N.
DATA: BEGIN OF BUFFER,
ALIGNMENT TYPE F,
C(8000) TYPE C,
END OF BUFFER.
FIELD-SYMBOLS: <WA> TYPE ANY,
<COMP1> TYPE ANY,
<COMP2> TYPE ANY.
GET TABLE NAME GIVEN BY USER IN LOCAL VARIABLE
TAB = TAB_NAME.
CREATE FIELD NAME BASED ON THE TABLE NAME ENTERED.
CASE TAB_NAME.
WHEN 'OIUH_RV_GL'.
KEY FIELD
TAB_COMP1 = 'GL_GL_SYS_NO'.
NO_OF_FLD = 1.
WHEN 'OIUH_RV_OPSL'.
KEY FIELD
TAB_COMP1 = 'OPSL_GL_SYS_NO'.
NO_OF_FLD = 1.
WHEN 'OIUH_RV_OTAX'.
NOT THE ONLY KEY FIELD
TAB_COMP1 = 'OTAX_GL_SYS_NO'.
TAB_COMP2 = 'OTAX_TAX_POS_NO'.
NO_OF_FLD = 2.
WHEN 'OIUH_RV_GTAX'.
NOT THE ONLY KEY FIELD
TAB_COMP1 = 'GTAX_GL_SYS_NO'.
TAB_COMP2 = 'GTAX_TAX_POS_NO'.
NO_OF_FLD = 2.
WHEN OTHERS.
EXIT.
ENDCASE.
SET FIELD SYMBOL WITH APPROPRIATE TYPE TO BUFFER AREA.
ASSIGN BUFFER TO <WA> CASTING TYPE (TAB).
How to add where clause and remove the if condition in the select -- endselect
SELECT * FROM (TAB) INTO <WA>.
ASSIGN COMPONENT TAB_COMP1 OF STRUCTURE <WA> TO <COMP1>.
IF NO_OF_FLD = 2.
ASSIGN COMPONENT TAB_COMP2 OF STRUCTURE <WA> TO <COMP2>.
ENDIF.
IF <COMP1> = OLD_SYS_NO.
code for updating table would come here
WRITE: 'MATCH FOUND'.
EXIT.
ENDIF.
ENDSELECT.
Please advice. Thanks much.
Edited by: Shipra Jhunjhunwala on Jul 22, 2009 1:33 PM
Edited by: Shipra Jhunjhunwala on Jul 22, 2009 1:34 PM
Edited by: Shipra Jhunjhunwala on Jul 22, 2009 1:35 PM1. Create single column table for holding field name depending on the table entered.
2. Take input from user: for e.g. table_name
3. Using case load single column table with required fields
for e.g.
CASE TAB_NAME.
WHEN 'OIUH_RV_GL'.
Append 'GL_GL_SYS_NO' to KEY_FIELD --> KEY_FIELD is the single line internal table as mentioned in step 1.
WHEN 'OIUH_RV_OPSL'.
Append 'OPSL_GL_SYS_NO'.
WHEN 'OIUH_RV_OTAX'.
Append 'OTAX_GL_SYS_NO' to KEY_FIELD.
APPEND 'OTAX_TAX_POS_NO' to KEY_FIELD.
WHEN 'OIUH_RV_GTAX'.
Append 'GTAX_GL_SYS_NO' to KEY_FIELD.
APPEND 'OTAX_TAX_POS_NO' to KEY_FIELD.
WHEN OTHERS.
EXIT.
ENDCASE.
Now depending on the table name you have required column ready
4. Create dynamic internal table using following sudo code
Fill the fieldcatlog using the single column field table and DD03L table, See what all columns from DD03L you want to fill in field catlog table
loop at internal table with all the fields.
move it to field catalog.
append field catalog.
endloop.
5. Pass this field catalog table to static method create_dynamic_table method
DATA table TYPE REF TO DATA. --> data object for holding handle to dynamic internal table.
call method cl_alv_table_create=>create_dynamic_table
exporting
it_fieldcatalog = fieldcatalog_tab
importing
ep_table = table.
6. Now assign table reference to field symbol of type table.
ASSIGN table->* to <field-tab>.
7. Also create work area <field-wa> using refrence of table.
create data object wa LIKE LINE OF <field-tab>.
ASSIGN wa->* to <field-wa>.
8. Also define field symbol for field name.
for e.g. <field_name>
4. Dynamic internal table is ready
5. Now execute the select statement as follows:
SELECT (KEY_FIELD)
INTO <ITAB> --> created dynamically above
FROM (TABLE_NAME)
WHERE (WHERE). --> WHERE is single line internal table having line type of CHAR72. So for every old value there will be one line
Where condition is same as like we give in static way only difference in this case it will stored in internal table line wise.
In this case you need to append all your where condition line by line in to WHERE.
5. To fill this dynamic internal table using ASSIGN COMPONENT <Comp_number> OF STRUCTURE <field-wa> TO <field-name>
So in this case if first field of structure STRUCT1 is user_id then sudo-code will be
loop at internal table containing list of fields into field_wa --> single column field table
ASSIGN COMPONENT field_wa OF STRUCTURE <field-wa> TO <field>. "Here field_wa is wa area for single column internal table holding all the fieldnames.
Now <field-name> points to user_id field. Move some value into it as nornally we do with variables.
Move <your_new_value> to <field-name>. --> Assign new value
or
<field-name> = <your_new_value>.
Endloop.
6. After completing all the fields one row will be ready in <field_wa>.
APPEND <field_wa> to <field_tab>.
Hope this helps you.
Thanks,
Augustin. -
How to use field symbol in select
Hi,
CONCATENATE 'WTG0' LV_MON INTO LV_FNAME.
ASSIGN (LV_FNAME) TO <FS>.
SELECT SINGLE <FS> FROM COSP INTO LV_SAPRST
WHERE OBJNR = LV_OBJ AND GJAHR = LV_YEAR AND WRTTP = '4' AND KSTAR = GT_INOUT-SAKNR
Error message : Unknown column name "<FS>" . field list. . field list. field list.
actually , if i use if command, i can do, but i want to use simple code by fieldsymbol.
is it possible in select command?
Thanks in advance
BenjaminHi
Hope it will help you.
reward if help.
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 -
How to use field symbols in program
how to use field symbols can any one explain with example please..
Regards,
venki...Hi
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.
<b>Reward points for useful Answers</b>
Regards
Anji -
Field symbols and field groups
Hi friends plz send me the answer for this query:
What are field symbols and field groups.? what is the"component idx of structure" clause with field groups?Hi,
A field group combines several existing fields together under one name
like
FIELD-GROUPS: fg.
then you can use one insert statement to insert values in fields of field-group.
INSERT f1 f2 ... INTO fg.
Field symbols
If u have experience with 'C', then understand this to be similar to a pointer.
It is used to reference another variable dynamically. So this field symbol will simply point to some other variable. and this pointer can be changed at runtime.
FIELD-SYMBOLS <FS>.
DATA FIELD VALUE 'X'.
ASSIGN FIELD TO <FS>.
WRITE <FS>.
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 Groups:
A field group is a user-defined grouping of characteristics and basic key figures from the EC-EIS or EC-BP field catalog.
Use
The field catalog contains the fields that are used in the aspects. As the number of fields grows, the field catalog becomes very large and unclear. To simplify maintenance of the aspects, you can group fields in a field group. You can group the fields as you wish, for example, by subject area or responsibility area. A field may be included in several field groups.
When maintaining the data structure of an aspect, you can select the field group that contains the relevant characteristics and basic key figures. This way you limit the number of fields offered.
Field Groups / Extracts
http://help.sap.com/saphelp_46c/helpdata/EN/9f/db9ede35c111d1829f0000e829fbfe/frameset.htm
Field Symbols
http://help.sap.com/saphelp_46c/helpdata/EN/fc/eb387a358411d1829f0000e829fbfe/frameset.htm
Regards,
Priyanka. -
Hi,
Can any one give me clear idea of field symbols and their use in the programing?
i read some help docs but could not get it what exactly it means
Thanks,
RaviHi
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.
Regards
Anji -
Field Symbols, Field String, and Field Group.
Hi,
Can you differentiate between filed symbols, field strings and field groups,
With regards,
Bharath Mohan BHi,
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
FIELD GROUPS
are used to hold/handle large amount of data when the internal table are not useful
we use EXTRACT statement, HEADER structure in them
see the example
REPORT demo_extract.
NODES: spfli, sflight.
FIELD-GROUPS: header, flight_info, flight_date.
START-OF-SELECTION.
INSERT: spfli-carrid spfli-connid sflight-fldate
INTO header,
spfli-cityfrom spfli-cityto
INTO flight_info.
GET spfli.
EXTRACT flight_info.
GET sflight.
EXTRACT flight_date.
END-OF-SELECTION.
SORT STABLE.
LOOP.
AT FIRST.
WRITE / 'Flight list'.
ULINE.
ENDAT.
AT flight_info WITH flight_date.
WRITE: / spfli-carrid , spfli-connid, sflight-fldate,
spfli-cityfrom, spfli-cityto.
ENDAT.
AT flight_date.
WRITE: / spfli-carrid , spfli-connid, sflight-fldate.
ENDAT.
AT LAST.
ULINE.
WRITE: cnt(spfli-carrid), 'Airlines'.
ULINE.
ENDAT.
ENDLOOP.
FIELD STRING is nothing but a string with one row of records.
Reward points if useful
regards
Anji
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