Field symbols and data extract

hi frenz,
Can anybody please give me details about field symbols and data extracts what is the purpose of using them and regarding the performance issues for the two.....
if some one explains with an example its going to be fine......
Please don tell me to refer the 980 or help document.....
Please help me out

Field symbols offer functionlity similar to pointers in other programming languages. It does not occupy memory for the data object, it points to the object that has been assigned to the field symbol. You use the assign command to relate to the data object. After the assign operation you can work with field symbol in the same way as with the object itself.
You define the field symbol as: field-symbols <fs>.
field-symbol <fs>.
data field value 'X'.
asssign field to <fs>.
The field symbol <fs> now inherits all the properties from the assigned field, and you can work with the field symbol in the same way as with the field itself.

Similar Messages

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
regards

Hi,
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 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.

Field symbols and index

What are field symbols and field groups.? Have you used "component idx of structure" clause with field groups?

Hi
this will help you
reward if usefull
FIELD-SYMBOLS
Syntax
FIELD-SYMBOLS <fs> { typing | STRUCTURE struc DEFAULT dobj }.
Extras:
1. ... typing
2. ... STRUCTURE struc DEFAULT dobj
The FIELD-SYMBOLS statement declares a field symbol <fs>. The name conventions apply to the name fs. The angle brackets of the field symbols indicate the difference to data objects and are obligatory. You can declare field symbols in any procedure and in the global declaration section of an ABAP program, but not in the declaration section of a class or an interface. You can use a field symbol in any operand position in which it is visible and which match the typing defined using typing.
After its declaration, a field symbol is initial - that is, it does not reference a memory area. You have to assign a memory area to it (normally using the ASSIGN statement) before you can use it as an operand. Otherwise an exception will be triggered.
FIELD-GROUPS
Syntax
FIELD-GROUPS { header | field_group }.
Declaration of a field group for the extract dataset of the program. Each field group represents the name of a line structure of the extract dataset. You can create as many field groups as you wish in a program. You define the actual components of a field group with the statement INSERT.
The denominator of a field group is either the predefined name header or any name field_group. If you declare a field group header, it automatically becomes the beginning part of all remaining field groups of the program and its components constitute the standard sort key of the extract dataset for the statement SORT.
The statement FIELD-GROUPS is possible in the global declaration-part of an ABAP program, as well as in the subprograms and function modules. Field groups that are declared in procedures are visible only there.
As you can only define global data objects as components of field groups with the statement INSERT, we recommend to declare field groups only in the global declaration part as well.

Difference between Field symbols and field group

Hi experts,
Can you please advice me what is the difference between field symbols and field groups.
Thanks in advance,
Logu.

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.
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.
example :
DATA: BEGIN OF SPTAB OCCURS 0,
line(1000), " or type string
END OF SPTAB.
DATA: IDX LIKE SY-INDEX.
field-symbols <FS1>.
split tb_sip AT ';' INTO table sptab.
LOOP AT SPTAB.
IDX = IDX + 1.
ASSIGN COMPONENT IDX OF STRUCTURE tb_detsip TO <FS1>.
If sy-subrc = 0.
<FS1> = SPTAB-line.
Endif.
Endloop.
append tb_detsip.
clear idx.
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
Reward points if useful.

Difference between Field symbols and Field groups

Hi Friends,
can you tell me the differences between Field symbols and Field groups? with any examples preferably?
Regards
Dinesh

Hi Dinesh,
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
Reward points if helpful.
Regards,
Hemant

What are field symbols and field groups.? Have you used "component idx of s

What are field symbols and field groups.? Have you used "component idx of structure"

Field Symbols and field groups
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
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.
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

Difference between Field symbols and work area for Internal tables

Hi,
In ECC versions we all know that we need to declare the internal tables without headerline, and for handling the internal tables we need to use exclusive work areas.
Currently i have an issue that we have been asked to use field symbols instead of work areas...can any one help me how to use the field symbols and also let me know how it will improve the performance of the program..
Thanks and Regards,
Kathir

Hi
DATA: WA TYPE ITAB.
LOOP AT ITAB INTO WA.
IF WA-FIELD = .....
ENDIF.
ENDLOOP.[(code]
FIELD-SYMBOLS <WA> TYPE ANY.
LOOP AT ITAB ASSIGNING <WA>.
ENDLOOP.
Now the problem is you can't know the name of the fields of the table at runtime, so you can't write:
IF <WA>-FIELD = .....
ENDIF.
Anyway you can create a field-symbols strcturated like the table:
[code]FIELD-SYMBOLS <WA> TYPE ITAB.
LOOP AT ITAB ASSIGNING <WA>.
IF <WA>-FIELD = .....
ENDIF.
ENDLOOP.
I don't know which are the differences for the performance between to use a field-symbol and to use a structure as work-area.
The differnce between the field-symbols and work-area is the field-symbol is assigned directly to the record, so u don't need to do a MODIFY statament to change something:
LOOP AT ITAB INTO WA.
WA-FIELD =
MODIFY ITAB FROM WA.
ENDLOOP.
LOOP AT ITAB ASSIGNING <WA>.
<WA>-FIELD =
ENDLOOP.
These two pieces of abap code do the same action, so probably the field-symbol improve the performance because it do an access directly to the record without to use an external structure as workarea.
Max

FieldStrings, field-symbols and matchcode objects

Hi,
Can u explain and give 1 example of each....
1. fieldstring
2. fieldsymbol
3. matchcode object.
Thanks,
Nidhi

FIELD-SYMBOLS . Its first component is assigned to the field symbol. GET REFERENCE is then used to get a reference to the second component not the structured data object in dref2. It is dereferenced without casting.
Ref link:
http://help.sap.com/saphelp_nw2004s/helpdata/en/43/41341147041806e10000000a1553f6/frameset.htm
https://forums.sdn.sap.com/click.jspa?searchID=-1&messageID=3068811
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
Matchcodes are defined in two stages in Abap/4 Dictionary:
1) The revelant table and fields are stipulated in matchcode object. A matchcode object describes the set of all possible search paths for a search item.
2) One or more matchcode ID can be defined for a matchcode object. A matchcode ID describes a special search path for a search term.The fields or combination of fields via which the search is to take place is defined in the matchcode ID.
Matchcodes are replaced by SEARCH HELPs in latest versions
see the doc
1) Elementary search helps describe a search path. The elementary search help must define where the data of the hit list should be read from (selection method), how the exchange of values between the screen template and selection method is implemented (interface of the search help) and how the online input help should be defined (online behavior of the search help).
2) Collective search helps combine several elementary search helps. A collective search help thus can offer several alternative search paths.
3)An elementary search help defines the standard flow of an input help.
4) A collective search help combines several elementary search helps. The user can thus choose one of several alternative search paths with a collective search help.
5)A collective search help comprises several elementary search helps. It combines all the search paths that are meaningful for a field.
6)Both elementary search helps and other search helps can be included in a collective search help. If other collective search helps are contained in a collective search help, they are expanded to the level of the elementary search helps when the input help is called.
CREATION:
Go to SE11 Tcode
select search help
give the 'z' search help name and create
select the selection method ur table name eg : 'mara'
dialog module 'display value immediately'.
add the field whatever u want and lpos = 1 and spos = 1 and check import and export parameter.
where left position when displaying and spos = search position
and then save and activate ..
See the links:
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ee38446011d189700000e8322d00/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ee45446011d189700000e8322d00/content.htm
https://forums.sdn.sap.com/click.jspa?searchID=3173469&messageID=2176485
https://forums.sdn.sap.com/click.jspa?searchID=3173469&messageID=3601619
pls go through this for search help creation
http://help.sap.com/saphelp_nw2004s/helpdata/en/41/f6b237fec48c67e10000009b38f8cf/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ee2b446011d189700000e8322d00/content.htm
Search Help Exits:
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ee52446011d189700000e8322d00/content.htm
http://www.sapdevelopment.co.uk/dictionary/shelp/shelp_exit.htm
https://forums.sdn.sap.com/click.jspa?searchID=4390517&messageID=1712818
Collective search help Combine several elementary search helps. A collective search help thus can offer several alternative search paths.
A Collective search help provides alternative search
Paths by combining elementary search helps.
Only one search help can be attached to a field, table or data element. Several search paths are therefore attached with a collective search help.
A collective search help also has interface parameters like
an elementary search help.
Like an elementary search help, a collective search help has an interface of IMPORT and EXPORT parameters with which the search help exchanges data. Using this interface, the collective search help can be attached to fields, tables and data elements exactly like an elementary search help.
Parameter assignment needs to be done for each of the
Included search helps.
When you define a collective search help, there are no components for describing the dialog behavior and data selection; instead the included search helps are listed here. You must assign the parameters of the collective search help to the interface parameters of the included search help for each inclusion.
User may choose the tab and thus the elementary
search maethod.
When we execute the search help SCUSTOM, we are confronted with a dialog which gives us an option of either restricting
By 1)Search for customer according to booking
2)Search for customer according to name.
These are effectively the elementary search helps (SCUSTOM_BOOK and SCUSTOM_NAME) which have been included in the collective search help SCUSTOM.
HOT KEY
The hot key is used to select the elementary search help from the collective search help and to enter the restrictions in the dialog box for restricting values directly from the entry field. If the user often searches for values using the same search help, this procedure can save time.
Steps to create a Collective Search Help
1)Enter the search help name and click on create.
2)Choose Collective search help radio button option as the search help type.
3)Enter the search help parameters.
4)Instead of the selection method, we enter the included
search helps for the collective search help.
5)We need to assign parameters for each of the included
search helps.
6)Complete the parameter assignment by clicking on the push button
7)Collective search help offers the user to obtain F4 help
using any of the included search helps.
Field string is nothing but the group of fields
You can call it as Structure also
example:
types: begin of x_str
kunnr type kunnr,
lifnr type lifnr,
name1 type name1,
land1 type land1,
end of x_str.
this stores one record at run time.
Reward points,
shakir

Re: field symbols and interna table

hi,
here is field symbol which is table type
FIELD-SYMBOLS: <gt_pos_data> TYPE table.
there is one internal table it_data.
how can move <gt_pos_data> to it_data.
please help me.
rgds

Hi
You can assign field wise:
like
<gt_pos_data>- field to to it_data-field.
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

How to add new fields to a data extract

The following data extract program generates an output file which is displayed using a publisher template as a check format report.
Oracle Payments Funds Disbursement Payment Instruction Extract 1.0
How would I add new fields to the generated file? In other words what is the procedure to add new fields to the data extract?
Thanks

Do anyone pls advise how to customize the payment extraction program? We also have the similar requirement to extract extra fields to format a payment file.

What are field symbols and field groups.?

hi,
What are field symbols and field groups.? what is the usage of "component idx of structure" clause with field groups?
regards

sorry, question resolved.

ABAP field symbols and PERL reference variables to unnamed arrays.

Rob -
Please do NOT delete this post even though it contains this link:
ABAP field symbols and PERL reference variables to unnamed arrays.
to a question I posted in the Scripting Languages forum.
It's a question that should be of interest to ABAP programmers, and they may miss if they don't frequent the SL forum ...
Thanks for your forbearance here (in advance, of course) ...
Best
djh
Edited by: Rob Burbank on Jul 11, 2011 1:26 PM

If interested, please reply in the original thread. We don't want multiple conversations at cross purposes do we?
Rob

Are field symbols and Dynamic internal tables consistant?

Hi,
Are field symbols and Dynamic internal tables
always consistent?
In my program I m creating a dynamic itab and assignig values to it using <FS>, sometimes the program fails to execute assign <Fs> statement...
this happens once in 3 to 4 runs
any solution...
I have proper clear and refresh statements in program.
Thanks,
Hardik

Anurag,
Thanks for a quick reply. Here I am sending a small piece of my code.
MOVE-CORRESPONDING OUTTAB TO DYNTAB.
 CLEAR IT_UDATE.
 CLEAR : T_KBETR .
 READ TABLE IT_UDATE WITH KEY UDATE = OUTTAB-UDATE.
 CONCATENATE 'DYNTAB-KBETR' IT_UDATE-CO_POS INTO T_KBETR.
 ASSIGN (T_KBETR) TO <FS> .
 SUBRC5 = SY-SUBRC .
 IF SUBRC5 = 0 .
 <FS> = OUTTAB-KBETR .
 ENDIF .
read statement will always return CO_POS .
while debuging this code a few times
ASSIGN (T_KBETR) TO <FS> .
returns sy-subrc = 4
and that was leading the program to short dump earlier.
now, as I have a check DYNTAB-KBETR holds no value on display.
this happens very few times. (most of the times report is displaying desired output)
Thanks,
Hardik

Need material on business content and data extraction

hi
friends
iam new to BW i Need material on business content and data extraction , plzz send me without help.sap material to my mail id [email protected]

Hi,
Pls check ur inbox....
Also go thru this link....
http://help.sap.com/saphelp_nw2004s/helpdata/en/37/5fb13cd0500255e10000000a114084/frameset.htm
Hope it helps,
Thanks,
Happy Life,
Aravind

Field symbols and data extract

Similar Messages

Maybe you are looking for