topic Re: Field symbol problem in Application Development and Automation Discussions

Field symbol problem

rahul2000 — Wed, 05 Dec 2007 05:56:50 GMT

Dear all,

I am facing a problem wherein i want to modify <FS_DYN_TABLE> from <FS_DYN_TABLE_TEMP>.It is getting modified,i.e the column for which i want it modified is getting modified but remaining values of that corresponding row are not being displayed.

my declaration for above two are as follows:-

FIELD-SYMBOLS: <FS_DYN_TABLE> TYPE STANDARD TABLE,"Dynamic table

<FS_DYN_TABLE_TEMP> TYPE ANY ,.Temporary Dynamic table

My syntax was

MODIFY <FS_DYN_TABLE> FROM <FS_DYN_TABLE_TEMP> INDEX W_INDEX TRANSPORTING PERCN.

If i give

MODIFY <FS_DYN_TABLE> FROM <FS_DYN_TABLE_TEMP> TRANSPORTING PERCN ,it gives an error saying :-

"The specified type has no structure and therefore no component called

"PERCN". component called "PERCN".

How to resolve this problem?

Re: Field symbol problem

Former Member — Wed, 05 Dec 2007 10:45:01 GMT

I'm not sure how to "untangle" your code, but here's a snippet using dynamic tables as an example.

1) define your itab structure e.g

TYPES: BEGIN OF s_elements,

tabname TYPE dd02l-tabname,

tabclass TYPE dd02l-tabclass,

as4user TYPE dd02l-as4user,

as4date TYPE dd02l-as4date,

as4time TYPE dd02l-as4time,

viewed(1) TYPE c.

TYPES: END OF s_elements.

data: my_line type s_elements.

2) some data for getting the structure

DATA: LR_RTTI_STRUC type ref to CL_ABAP_STRUCTDESCR,

zog LIKE LINE OF lr_rtti_struc->components,

zogt LIKE TABLE OF zog .

3) get the structure as follows

lr_rtti_struc ?= cl_abap_structdescr=>describe_by_data( my_line ).

zogt[] = lr_rtti_struc->components.

4) Create the field catalog for your dynamic table - you need this so we can reference the individual fields by name

data WA_IT_FLDCAT type LVC_S_FCAT ,

IT_FLDCAT type LVC_T_FCAT .

LOOP AT zogt INTO zog.

CLEAR wa_it_fldcat.

wa_it_fldcat-fieldname = zog-name .

wa_it_fldcat-datatype = zog-type_kind.

wa_it_fldcat-inttype = zog-type_kind.

wa_it_fldcat-intlen = zog-length.

wa_it_fldcat-decimals = zog-decimals.

wa_it_fldcat-coltext = zog-name.

wa_it_fldcat-lowercase = 'X'.

APPEND wa_it_fldcat TO it_fldcat .

ENDLOOP.

5) now we can create a dynamic table based on our data structure

data: dy_table type ref to DATA;

CALL METHOD cl_alv_table_create=>create_dynamic_table

EXPORTING

it_fieldcatalog = it_fldcat

IMPORTING

ep_table = dy_table.

5) let's now populate this table

data: dy_line TYPE REF TO data.

field-symbols:

<dyn_table> TYPE STANDARD TABLE,

<dyn_wa>.

ASSIGN dy_table->* TO <dyn_table>.

CREATE DATA dy_line LIKE LINE OF <dyn_table>.

ASSIGN dy_line->* TO <dyn_wa>.

SELECT *

FROM dd02l

INTO CORRESPONDING FIELDS OF TABLE <dyn_table>

WHERE tabname LIKE 'ZHR%'.

you will now find <dyn_table> contains all the fields by name as defined in your original structure (s_elements in the above example).

Read the table into a work area having the same structure as your dynamic itab e.g READ TABLE <dyn_table> INDEX e_row INTO wa_elements.

You can then refer to individual elements such as wa_elements-tabname.

To update the dynamic table for example simply update the work area and then modify the table from the work area.

For example

wa_elements-viewed = 'V'.

MODIFY <dyn_table> FROM wa_elements INDEX e_row.

Cheers

jimbo

Re: Field symbol problem

former_member784222 — Wed, 05 Dec 2007 10:48:05 GMT

Hi,

I think you need to deference <FS_DYN_TABLE_TEMP>, <FS_DYN_TABLE> as follows:

FIELD-SYMBOLS: <FS_DYN_TABLE> TYPE STANDARD TABLE,"Dynamic table

<FS_DYN_TABLE_TEMP> TYPE ANY ,.Temporary Dynamic table

DATA: dref TYPE REF TO DATA.

Create data dref type (your table structure).

Assign dref->* to <FS_DYN_TABLE_TEMP>.

Similarly you need to deference(assign structure) for <FS_DYN_TABLE>.

Thanks and regards,

S. Chandra Mouli.

Re: Field symbol problem

Former Member — Wed, 05 Dec 2007 11:27:46 GMT

What you need to do actually is having got your structure

then ASSIGN COMPONENT 'XXXXX' of structure <dyn_wa> to <fs1>.

then fill <fs1> with your value

repeat for all components of the structure you want to modify.

then modify <dyn_table> from <dyn_wa> index nnn where nnn is the line you want to modify.

Another easier way of course is to have a work area defined as your structure

in my example above I have wa_elements type s_elements.

now I can easily modify the dynamic itab as follows

READ TABLE <dyn_table> INDEX e_row INTO wa_elements..

wa_elements-viewed = 'V'.

MODIFY <dyn_table> FROM wa_elements INDEX e_row.

cheers

jimbo

Re: Field symbol problem

former_member199581 — Wed, 05 Dec 2007 13:00:36 GMT

You cannot use this syntax, since <FS_DYN_TABLE> is dynamic and the system doesn't know it's structure before runtime.

You should assign the component you need to an another field symbol, using:


ASSIGN COMPONENT 'PERCN' OF STRUCTURE <FS_DYN_TABLE_TEMP> TO <FS_PERCN>.

Now you have the value in the new FS, and can check the value.

When modifyng the table, you can use dynamic component specification using a character-type variable (such as comp_name TYPE C LENGTH 20), which should contain the name of the component, like this:


comp_name = 'PERCN'.
MODIFY <FS_DYN_TABLE> FROM <FS_DYN_TABLE_TEMP> TRANSPORTING (comp_name).

Note that modify, if a runtime error occurs, triggers a non-catchable exceptions, so do your tries!

Hope this helps,

Roby.