ABAP Select data from SAP table MAEQ_HELD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MAEQ_HELD
*  INTO TABLE @DATA(IT_MAEQ_HELD2).
*--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_MAEQ_HELD INDEX 1 INTO DATA(WA_MAEQ_HELD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MAEQ_HELD>-MA1 = 1.
<MAEQ_HELD>-MA2 = 1.
<MAEQ_HELD>-MA3 = 1.
<MAEQ_HELD>-MA4 = 1.
<MAEQ_HELD>-MA5 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MAEQ_HELD-MA6, sy-vline,
  WA_MAEQ_HELD-MA7, sy-vline,
  WA_MAEQ_HELD-MA8, sy-vline,
  WA_MAEQ_HELD-MA9, sy-vline,
  WA_MAEQ_HELD-MA10, sy-vline,
  WA_MAEQ_HELD-MA11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MAEQ_HELD 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_MAEQ_HELD 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_MAEQ_HELD INTO WA_MAEQ_HELD.


*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_MAEQ_HELD_STR, 
MA1 TYPE STRING,
MA2 TYPE STRING,
MA3 TYPE STRING,
MA4 TYPE STRING,
MA5 TYPE STRING,
MA6 TYPE STRING,
MA7 TYPE STRING,
MA8 TYPE STRING,
MA9 TYPE STRING,
MA10 TYPE STRING,
MA11 TYPE STRING,
MA12 TYPE STRING,
MA13 TYPE STRING,
MA14 TYPE STRING,
MA15 TYPE STRING,
MA16 TYPE STRING,
MA17 TYPE STRING,
MA18 TYPE STRING,
MA19 TYPE STRING,
MA20 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MAEQ_HELD_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_MAEQ_HELD_STR-MA1 sy-vline 
WA_MAEQ_HELD_STR-MA2 sy-vline 
WA_MAEQ_HELD_STR-MA3 sy-vline 
WA_MAEQ_HELD_STR-MA4 sy-vline 
WA_MAEQ_HELD_STR-MA5 sy-vline 
WA_MAEQ_HELD_STR-MA6 sy-vline 
WA_MAEQ_HELD_STR-MA7 sy-vline 
WA_MAEQ_HELD_STR-MA8 sy-vline 
WA_MAEQ_HELD_STR-MA9 sy-vline 
WA_MAEQ_HELD_STR-MA10 sy-vline 
WA_MAEQ_HELD_STR-MA11 sy-vline 
WA_MAEQ_HELD_STR-MA12 sy-vline 
WA_MAEQ_HELD_STR-MA13 sy-vline 
WA_MAEQ_HELD_STR-MA14 sy-vline 
WA_MAEQ_HELD_STR-MA15 sy-vline 
WA_MAEQ_HELD_STR-MA16 sy-vline 
WA_MAEQ_HELD_STR-MA17 sy-vline 
WA_MAEQ_HELD_STR-MA18 sy-vline 
WA_MAEQ_HELD_STR-MA19 sy-vline 
WA_MAEQ_HELD_STR-MA20 sy-vline      INTO ld_text SEPARATED BY SPACE.

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