ABAP Select data from SAP table T7KRST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T7KRST table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to T7KRST. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the T7KRST table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_T7KRST TYPE STANDARD TABLE OF T7KRST,
      WA_T7KRST TYPE T7KRST,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <T7KRST> TYPE T7KRST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T7KRST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T7KRST
  INTO TABLE IT_T7KRST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T7KRST
*  INTO TABLE @DATA(IT_T7KRST2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_T7KRST INDEX 1 INTO DATA(WA_T7KRST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T7KRST ASSIGNING <T7KRST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T7KRST>-MANDT = 1.
<T7KRST>-TAXGR = 1.
<T7KRST>-ENDDA = 1.
<T7KRST>-BEGDA = 1.
<T7KRST>-LWLMT = 1.

ENDLOOP.

LOOP AT IT_T7KRST INTO WA_T7KRST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T7KRST-UPLMT, sy-vline,
  WA_T7KRST-DEP01, sy-vline,
  WA_T7KRST-NOR01, sy-vline,
  WA_T7KRST-MAN01, sy-vline,
  WA_T7KRST-DEP02, sy-vline,
  WA_T7KRST-NOR02, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T7KRST you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_T7KRST TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_T7KRST INTO WA_T7KRST.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_T7KRST_STR, 
MANDT TYPE STRING,
TAXGR TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
LWLMT TYPE STRING,
UPLMT TYPE STRING,
DEP01 TYPE STRING,
NOR01 TYPE STRING,
MAN01 TYPE STRING,
DEP02 TYPE STRING,
NOR02 TYPE STRING,
MAN02 TYPE STRING,
DEP03 TYPE STRING,
NOR03 TYPE STRING,
MAN03 TYPE STRING,
DEP04 TYPE STRING,
NOR04 TYPE STRING,
MAN04 TYPE STRING,
DEP05 TYPE STRING,
NOR05 TYPE STRING,
MAN05 TYPE STRING,
DEP06 TYPE STRING,
NOR06 TYPE STRING,
MAN06 TYPE STRING,
DEP07 TYPE STRING,
NOR07 TYPE STRING,
MAN07 TYPE STRING,
DEP08 TYPE STRING,
NOR08 TYPE STRING,
MAN08 TYPE STRING,
DEP09 TYPE STRING,
NOR09 TYPE STRING,
MAN09 TYPE STRING,
DEP10 TYPE STRING,
NOR10 TYPE STRING,
MAN10 TYPE STRING,
DEP11 TYPE STRING,
NOR11 TYPE STRING,
MAN11 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T7KRST_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_T7KRST_STR-MANDT sy-vline 
WA_T7KRST_STR-TAXGR sy-vline 
WA_T7KRST_STR-ENDDA sy-vline 
WA_T7KRST_STR-BEGDA sy-vline 
WA_T7KRST_STR-LWLMT sy-vline 
WA_T7KRST_STR-UPLMT sy-vline 
WA_T7KRST_STR-DEP01 sy-vline 
WA_T7KRST_STR-NOR01 sy-vline 
WA_T7KRST_STR-MAN01 sy-vline 
WA_T7KRST_STR-DEP02 sy-vline 
WA_T7KRST_STR-NOR02 sy-vline 
WA_T7KRST_STR-MAN02 sy-vline 
WA_T7KRST_STR-DEP03 sy-vline 
WA_T7KRST_STR-NOR03 sy-vline 
WA_T7KRST_STR-MAN03 sy-vline 
WA_T7KRST_STR-DEP04 sy-vline 
WA_T7KRST_STR-NOR04 sy-vline 
WA_T7KRST_STR-MAN04 sy-vline 
WA_T7KRST_STR-DEP05 sy-vline 
WA_T7KRST_STR-NOR05 sy-vline 
WA_T7KRST_STR-MAN05 sy-vline 
WA_T7KRST_STR-DEP06 sy-vline 
WA_T7KRST_STR-NOR06 sy-vline 
WA_T7KRST_STR-MAN06 sy-vline 
WA_T7KRST_STR-DEP07 sy-vline 
WA_T7KRST_STR-NOR07 sy-vline 
WA_T7KRST_STR-MAN07 sy-vline 
WA_T7KRST_STR-DEP08 sy-vline 
WA_T7KRST_STR-NOR08 sy-vline 
WA_T7KRST_STR-MAN08 sy-vline 
WA_T7KRST_STR-DEP09 sy-vline 
WA_T7KRST_STR-NOR09 sy-vline 
WA_T7KRST_STR-MAN09 sy-vline 
WA_T7KRST_STR-DEP10 sy-vline 
WA_T7KRST_STR-NOR10 sy-vline 
WA_T7KRST_STR-MAN10 sy-vline 
WA_T7KRST_STR-DEP11 sy-vline 
WA_T7KRST_STR-NOR11 sy-vline 
WA_T7KRST_STR-MAN11 sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.