ABAP Select data from SAP table MEREQ_HEADERX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEREQ_HEADERX
*  INTO TABLE @DATA(IT_MEREQ_HEADERX2).
*--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_MEREQ_HEADERX INDEX 1 INTO DATA(WA_MEREQ_HEADERX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEREQ_HEADERX>-BANFN = 1.
<MEREQ_HEADERX>-BANFN_EXT = 1.
<MEREQ_HEADERX>-BSART = 1.
<MEREQ_HEADERX>-BSAKZ = 1.
<MEREQ_HEADERX>-BSTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEREQ_HEADERX-GSFRG, sy-vline,
  WA_MEREQ_HEADERX-ESTKZ, sy-vline,
  WA_MEREQ_HEADERX-PINCR, sy-vline,
  WA_MEREQ_HEADERX-LPONR, sy-vline,
  WA_MEREQ_HEADERX-KZZUO, sy-vline,
  WA_MEREQ_HEADERX-MEMORY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEREQ_HEADERX 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_MEREQ_HEADERX 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_MEREQ_HEADERX INTO WA_MEREQ_HEADERX.


*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_MEREQ_HEADERX_STR, 
BANFN TYPE STRING,
BANFN_EXT TYPE STRING,
BSART TYPE STRING,
BSAKZ TYPE STRING,
BSTYP TYPE STRING,
GSFRG TYPE STRING,
ESTKZ TYPE STRING,
PINCR TYPE STRING,
LPONR TYPE STRING,
KZZUO TYPE STRING,
MEMORY TYPE STRING,
MEMORYTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEREQ_HEADERX_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_MEREQ_HEADERX_STR-BANFN sy-vline 
WA_MEREQ_HEADERX_STR-BANFN_EXT sy-vline 
WA_MEREQ_HEADERX_STR-BSART sy-vline 
WA_MEREQ_HEADERX_STR-BSAKZ sy-vline 
WA_MEREQ_HEADERX_STR-BSTYP sy-vline 
WA_MEREQ_HEADERX_STR-GSFRG sy-vline 
WA_MEREQ_HEADERX_STR-ESTKZ sy-vline 
WA_MEREQ_HEADERX_STR-PINCR sy-vline 
WA_MEREQ_HEADERX_STR-LPONR sy-vline 
WA_MEREQ_HEADERX_STR-KZZUO sy-vline 
WA_MEREQ_HEADERX_STR-MEMORY sy-vline 
WA_MEREQ_HEADERX_STR-MEMORYTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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