ABAP Select data from SAP table TCGREL02 into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP TCGREL02 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 TCGREL02. 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 TCGREL02 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_TCGREL02 TYPE STANDARD TABLE OF TCGREL02,
      WA_TCGREL02 TYPE TCGREL02,
      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: <TCGREL02> TYPE TCGREL02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TCGREL02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TCGREL02
  INTO TABLE IT_TCGREL02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TCGREL02
*  INTO TABLE @DATA(IT_TCGREL022).
*--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_TCGREL02 INDEX 1 INTO DATA(WA_TCGREL022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TCGREL02 ASSIGNING <TCGREL02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TCGREL02>-RECN = 1.
<TCGREL02>-AENNR = 1.
<TCGREL02>-NAMEMST = 1.
<TCGREL02>-RECNROOT = 1.
<TCGREL02>-FLG_EXCL = 1.

ENDLOOP.

LOOP AT IT_TCGREL02 INTO WA_TCGREL02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TCGREL02-FLG_OVRTMP, sy-vline,
  WA_TCGREL02-FLG_DEACT, sy-vline,
  WA_TCGREL02-RECN_TPLH, sy-vline,
  WA_TCGREL02-TPL_ORD, sy-vline,
  WA_TCGREL02-RECN_SRC, sy-vline,
  WA_TCGREL02-RECN_ORIG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TCGREL02 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_TCGREL02 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_TCGREL02 INTO WA_TCGREL02.


*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.

*Conversion exit ALPHA, internal->external for field RECN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCGREL02-RECN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCGREL02-RECN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCGREL02-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCGREL02-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNROOT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCGREL02-RECNROOT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCGREL02-RECNROOT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECN_TPLH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCGREL02-RECN_TPLH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCGREL02-RECN_TPLH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECN_SRC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCGREL02-RECN_SRC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCGREL02-RECN_SRC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECN_ORIG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCGREL02-RECN_ORIG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCGREL02-RECN_ORIG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNROOT_ORIG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCGREL02-RECNROOT_ORIG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCGREL02-RECNROOT_ORIG.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_TCGREL02_STR, 
RECN TYPE STRING,
AENNR TYPE STRING,
NAMEMST TYPE STRING,
RECNROOT TYPE STRING,
FLG_EXCL TYPE STRING,
FLG_OVRTMP TYPE STRING,
FLG_DEACT TYPE STRING,
RECN_TPLH TYPE STRING,
TPL_ORD TYPE STRING,
RECN_SRC TYPE STRING,
RECN_ORIG TYPE STRING,
RECNROOT_ORIG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TCGREL02_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_TCGREL02_STR-RECN sy-vline 
WA_TCGREL02_STR-AENNR sy-vline 
WA_TCGREL02_STR-NAMEMST sy-vline 
WA_TCGREL02_STR-RECNROOT sy-vline 
WA_TCGREL02_STR-FLG_EXCL sy-vline 
WA_TCGREL02_STR-FLG_OVRTMP sy-vline 
WA_TCGREL02_STR-FLG_DEACT sy-vline 
WA_TCGREL02_STR-RECN_TPLH sy-vline 
WA_TCGREL02_STR-TPL_ORD sy-vline 
WA_TCGREL02_STR-RECN_SRC sy-vline 
WA_TCGREL02_STR-RECN_ORIG sy-vline 
WA_TCGREL02_STR-RECNROOT_ORIG sy-vline      INTO ld_text SEPARATED BY SPACE.

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