ABAP Select data from SAP table MEREQ_SOURCE_DATA into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MEREQ_SOURCE_DATA 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_SOURCE_DATA. 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_SOURCE_DATA 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_SOURCE_DATA TYPE STANDARD TABLE OF MEREQ_SOURCE_DATA,
      WA_MEREQ_SOURCE_DATA TYPE MEREQ_SOURCE_DATA,
      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_SOURCE_DATA> TYPE MEREQ_SOURCE_DATA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEREQ_SOURCE_DATA
*  INTO TABLE @DATA(IT_MEREQ_SOURCE_DATA2).
*--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_SOURCE_DATA INDEX 1 INTO DATA(WA_MEREQ_SOURCE_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEREQ_SOURCE_DATA>-BANFN = 1.
<MEREQ_SOURCE_DATA>-BNFPO = 1.
<MEREQ_SOURCE_DATA>-MATNR = 1.
<MEREQ_SOURCE_DATA>-WERKS = 1.
<MEREQ_SOURCE_DATA>-MATKL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEREQ_SOURCE_DATA-LFDAT, sy-vline,
  WA_MEREQ_SOURCE_DATA-MENGE, sy-vline,
  WA_MEREQ_SOURCE_DATA-BSMNG, sy-vline,
  WA_MEREQ_SOURCE_DATA-BSART, sy-vline,
  WA_MEREQ_SOURCE_DATA-BSTYP, sy-vline,
  WA_MEREQ_SOURCE_DATA-PSTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEREQ_SOURCE_DATA 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_SOURCE_DATA 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_SOURCE_DATA INTO WA_MEREQ_SOURCE_DATA.


*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 BANFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-BANFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-BANFN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-SATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field EMATN
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-EMATN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-EMATN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field REVLV
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-REVLV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-REVLV.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field ADRN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-ADRN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-ADRN2.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field BMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-BMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-BMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERKZ, internal->external for field IPRKZ
CALL FUNCTION 'CONVERSION_EXIT_PERKZ_OUTPUT'
  EXPORTING
    input =                      WA_MEREQ_SOURCE_DATA-IPRKZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREQ_SOURCE_DATA-IPRKZ.
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_MEREQ_SOURCE_DATA_STR, 
BANFN TYPE STRING,
BNFPO TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
MATKL TYPE STRING,
LFDAT TYPE STRING,
MENGE TYPE STRING,
BSMNG TYPE STRING,
BSART TYPE STRING,
BSTYP TYPE STRING,
PSTYP TYPE STRING,
BSAKZ TYPE STRING,
KZVBR TYPE STRING,
KNTTP TYPE STRING,
MEINS TYPE STRING,
RESWK TYPE STRING,
FRGDT TYPE STRING,
PACKNO TYPE STRING,
VERID TYPE STRING,
TXZ01 TYPE STRING,
WAERS TYPE STRING,
SATNR TYPE STRING,
ATTYP TYPE STRING,
SOBKZ TYPE STRING,
UMSOK TYPE STRING,
KZFME TYPE STRING,
EMATN TYPE STRING,
MPROF TYPE STRING,
REVLV TYPE STRING,
MFRNR TYPE STRING,
MFRPN TYPE STRING,
EMNFR TYPE STRING,
BPUEB TYPE STRING,
CUOBJ TYPE STRING,
PLIFZ TYPE STRING,
LBLKZ TYPE STRING,
EMLIF TYPE STRING,
ADRNR TYPE STRING,
ADRN2 TYPE STRING,
KUNNR TYPE STRING,
BMEIN TYPE STRING,
PREIS TYPE STRING,
PEINH TYPE STRING,
LOEKZ TYPE STRING,
RESLO TYPE STRING,
LGORT TYPE STRING,
ESTKZ TYPE STRING,
MHDRZ TYPE STRING,
IPRKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEREQ_SOURCE_DATA_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_SOURCE_DATA_STR-BANFN sy-vline 
WA_MEREQ_SOURCE_DATA_STR-BNFPO sy-vline 
WA_MEREQ_SOURCE_DATA_STR-MATNR sy-vline 
WA_MEREQ_SOURCE_DATA_STR-WERKS sy-vline 
WA_MEREQ_SOURCE_DATA_STR-MATKL sy-vline 
WA_MEREQ_SOURCE_DATA_STR-LFDAT sy-vline 
WA_MEREQ_SOURCE_DATA_STR-MENGE sy-vline 
WA_MEREQ_SOURCE_DATA_STR-BSMNG sy-vline 
WA_MEREQ_SOURCE_DATA_STR-BSART sy-vline 
WA_MEREQ_SOURCE_DATA_STR-BSTYP sy-vline 
WA_MEREQ_SOURCE_DATA_STR-PSTYP sy-vline 
WA_MEREQ_SOURCE_DATA_STR-BSAKZ sy-vline 
WA_MEREQ_SOURCE_DATA_STR-KZVBR sy-vline 
WA_MEREQ_SOURCE_DATA_STR-KNTTP sy-vline 
WA_MEREQ_SOURCE_DATA_STR-MEINS sy-vline 
WA_MEREQ_SOURCE_DATA_STR-RESWK sy-vline 
WA_MEREQ_SOURCE_DATA_STR-FRGDT sy-vline 
WA_MEREQ_SOURCE_DATA_STR-PACKNO sy-vline 
WA_MEREQ_SOURCE_DATA_STR-VERID sy-vline 
WA_MEREQ_SOURCE_DATA_STR-TXZ01 sy-vline 
WA_MEREQ_SOURCE_DATA_STR-WAERS sy-vline 
WA_MEREQ_SOURCE_DATA_STR-SATNR sy-vline 
WA_MEREQ_SOURCE_DATA_STR-ATTYP sy-vline 
WA_MEREQ_SOURCE_DATA_STR-SOBKZ sy-vline 
WA_MEREQ_SOURCE_DATA_STR-UMSOK sy-vline 
WA_MEREQ_SOURCE_DATA_STR-KZFME sy-vline 
WA_MEREQ_SOURCE_DATA_STR-EMATN sy-vline 
WA_MEREQ_SOURCE_DATA_STR-MPROF sy-vline 
WA_MEREQ_SOURCE_DATA_STR-REVLV sy-vline 
WA_MEREQ_SOURCE_DATA_STR-MFRNR sy-vline 
WA_MEREQ_SOURCE_DATA_STR-MFRPN sy-vline 
WA_MEREQ_SOURCE_DATA_STR-EMNFR sy-vline 
WA_MEREQ_SOURCE_DATA_STR-BPUEB sy-vline 
WA_MEREQ_SOURCE_DATA_STR-CUOBJ sy-vline 
WA_MEREQ_SOURCE_DATA_STR-PLIFZ sy-vline 
WA_MEREQ_SOURCE_DATA_STR-LBLKZ sy-vline 
WA_MEREQ_SOURCE_DATA_STR-EMLIF sy-vline 
WA_MEREQ_SOURCE_DATA_STR-ADRNR sy-vline 
WA_MEREQ_SOURCE_DATA_STR-ADRN2 sy-vline 
WA_MEREQ_SOURCE_DATA_STR-KUNNR sy-vline 
WA_MEREQ_SOURCE_DATA_STR-BMEIN sy-vline 
WA_MEREQ_SOURCE_DATA_STR-PREIS sy-vline 
WA_MEREQ_SOURCE_DATA_STR-PEINH sy-vline 
WA_MEREQ_SOURCE_DATA_STR-LOEKZ sy-vline 
WA_MEREQ_SOURCE_DATA_STR-RESLO sy-vline 
WA_MEREQ_SOURCE_DATA_STR-LGORT sy-vline 
WA_MEREQ_SOURCE_DATA_STR-ESTKZ sy-vline 
WA_MEREQ_SOURCE_DATA_STR-MHDRZ sy-vline 
WA_MEREQ_SOURCE_DATA_STR-IPRKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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