ABAP Select data from SAP table TN1MECHARTGRP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TN1MECHARTGRP 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 TN1MECHARTGRP. 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 TN1MECHARTGRP 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_TN1MECHARTGRP TYPE STANDARD TABLE OF TN1MECHARTGRP,
      WA_TN1MECHARTGRP TYPE TN1MECHARTGRP,
      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: <TN1MECHARTGRP> TYPE TN1MECHARTGRP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TN1MECHARTGRP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TN1MECHARTGRP
  INTO TABLE IT_TN1MECHARTGRP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TN1MECHARTGRP
*  INTO TABLE @DATA(IT_TN1MECHARTGRP2).
*--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_TN1MECHARTGRP INDEX 1 INTO DATA(WA_TN1MECHARTGRP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TN1MECHARTGRP ASSIGNING <TN1MECHARTGRP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TN1MECHARTGRP>-MANDT = 1.
<TN1MECHARTGRP>-GROUPINGID = 1.
<TN1MECHARTGRP>-GROUPINGTYPE = 1.
<TN1MECHARTGRP>-INCL_PRN = 1.
<TN1MECHARTGRP>-ERDAT = 1.

ENDLOOP.

LOOP AT IT_TN1MECHARTGRP INTO WA_TN1MECHARTGRP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TN1MECHARTGRP-ERTIM, sy-vline,
  WA_TN1MECHARTGRP-ERUSR, sy-vline,
  WA_TN1MECHARTGRP-UPDAT, sy-vline,
  WA_TN1MECHARTGRP-UPTIM, sy-vline,
  WA_TN1MECHARTGRP-UPUSR, sy-vline,
  WA_TN1MECHARTGRP-LOEKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TN1MECHARTGRP 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_TN1MECHARTGRP 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_TN1MECHARTGRP INTO WA_TN1MECHARTGRP.


*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_TN1MECHARTGRP_STR, 
MANDT TYPE STRING,
GROUPINGID TYPE STRING,
GROUPINGTYPE TYPE STRING,
INCL_PRN TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPTIM TYPE STRING,
UPUSR TYPE STRING,
LOEKZ TYPE STRING,
LOUSR TYPE STRING,
LODAT TYPE STRING,
LOTIM TYPE STRING,
SUBGRPID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TN1MECHARTGRP_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_TN1MECHARTGRP_STR-MANDT sy-vline 
WA_TN1MECHARTGRP_STR-GROUPINGID sy-vline 
WA_TN1MECHARTGRP_STR-GROUPINGTYPE sy-vline 
WA_TN1MECHARTGRP_STR-INCL_PRN sy-vline 
WA_TN1MECHARTGRP_STR-ERDAT sy-vline 
WA_TN1MECHARTGRP_STR-ERTIM sy-vline 
WA_TN1MECHARTGRP_STR-ERUSR sy-vline 
WA_TN1MECHARTGRP_STR-UPDAT sy-vline 
WA_TN1MECHARTGRP_STR-UPTIM sy-vline 
WA_TN1MECHARTGRP_STR-UPUSR sy-vline 
WA_TN1MECHARTGRP_STR-LOEKZ sy-vline 
WA_TN1MECHARTGRP_STR-LOUSR sy-vline 
WA_TN1MECHARTGRP_STR-LODAT sy-vline 
WA_TN1MECHARTGRP_STR-LOTIM sy-vline 
WA_TN1MECHARTGRP_STR-SUBGRPID sy-vline      INTO ld_text SEPARATED BY SPACE.

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