ABAP Select data from SAP table MDEZ_DB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDEZ_DB
*  INTO TABLE @DATA(IT_MDEZ_DB2).
*--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_MDEZ_DB INDEX 1 INTO DATA(WA_MDEZ_DB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDEZ_DB>-MANDT = 1.
<MDEZ_DB>-MATNR = 1.
<MDEZ_DB>-PLANT = 1.
<MDEZ_DB>-LINE = 1.
<MDEZ_DB>-PLAAB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDEZ_DB-PLANR, sy-vline,
  WA_MDEZ_DB-SORT0, sy-vline,
  WA_MDEZ_DB-TAG00, sy-vline,
  WA_MDEZ_DB-SORT1, sy-vline,
  WA_MDEZ_DB-SORT2, sy-vline,
  WA_MDEZ_DB-DELKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDEZ_DB 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_MDEZ_DB 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_MDEZ_DB INTO WA_MDEZ_DB.


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

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

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

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

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

*Conversion exit MATN1, internal->external for field MPNMT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MDEZ_DB-MPNMT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDEZ_DB-MPNMT.
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_MDEZ_DB_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
PLANT TYPE STRING,
LINE TYPE STRING,
PLAAB TYPE STRING,
PLANR TYPE STRING,
SORT0 TYPE STRING,
TAG00 TYPE STRING,
SORT1 TYPE STRING,
SORT2 TYPE STRING,
DELKZ TYPE STRING,
PLUMI TYPE STRING,
VRFKZ TYPE STRING,
DAT00 TYPE STRING,
DAT01 TYPE STRING,
DELB0 TYPE STRING,
EXTRA TYPE STRING,
AUSSL TYPE STRING,
AUSKT TYPE STRING,
MNG01 TYPE STRING,
MNG02 TYPE STRING,
MNG03 TYPE STRING,
MNG04 TYPE STRING,
FBYTE TYPE STRING,
ALINE TYPE STRING,
ZLINE TYPE STRING,
SELKZ TYPE STRING,
ABEKZ TYPE STRING,
VERID TYPE STRING,
SERNR TYPE STRING,
REVLV TYPE STRING,
MNAUS TYPE STRING,
DAT02 TYPE STRING,
DAT03 TYPE STRING,
SOBES TYPE STRING,
ESOBS TYPE STRING,
WRK01 TYPE STRING,
WRK02 TYPE STRING,
SLOC2 TYPE STRING,
LGORT TYPE STRING,
UMDAT TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,
MD4KD TYPE STRING,
MD4LI TYPE STRING,
LLMSG TYPE STRING,
LLDLY TYPE STRING,
TRAMG TYPE STRING,
USEX1 TYPE STRING,
USEX2 TYPE STRING,
USEX3 TYPE STRING,
SORT3 TYPE STRING,
UNIV1 TYPE STRING,
UNIV2 TYPE STRING,
UNIV3 TYPE STRING,
DETAIL_ICON TYPE STRING,
PRIO_URG TYPE STRING,
PRIO_REQ TYPE STRING,
MDMAT TYPE STRING,
MDLOC TYPE STRING,
MDWRK TYPE STRING,
MDBER TYPE STRING,
SGT_RCAT TYPE STRING,
SGT_SCAT TYPE STRING,
MPNMT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDEZ_DB_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_MDEZ_DB_STR-MANDT sy-vline 
WA_MDEZ_DB_STR-MATNR sy-vline 
WA_MDEZ_DB_STR-PLANT sy-vline 
WA_MDEZ_DB_STR-LINE sy-vline 
WA_MDEZ_DB_STR-PLAAB sy-vline 
WA_MDEZ_DB_STR-PLANR sy-vline 
WA_MDEZ_DB_STR-SORT0 sy-vline 
WA_MDEZ_DB_STR-TAG00 sy-vline 
WA_MDEZ_DB_STR-SORT1 sy-vline 
WA_MDEZ_DB_STR-SORT2 sy-vline 
WA_MDEZ_DB_STR-DELKZ sy-vline 
WA_MDEZ_DB_STR-PLUMI sy-vline 
WA_MDEZ_DB_STR-VRFKZ sy-vline 
WA_MDEZ_DB_STR-DAT00 sy-vline 
WA_MDEZ_DB_STR-DAT01 sy-vline 
WA_MDEZ_DB_STR-DELB0 sy-vline 
WA_MDEZ_DB_STR-EXTRA sy-vline 
WA_MDEZ_DB_STR-AUSSL sy-vline 
WA_MDEZ_DB_STR-AUSKT sy-vline 
WA_MDEZ_DB_STR-MNG01 sy-vline 
WA_MDEZ_DB_STR-MNG02 sy-vline 
WA_MDEZ_DB_STR-MNG03 sy-vline 
WA_MDEZ_DB_STR-MNG04 sy-vline 
WA_MDEZ_DB_STR-FBYTE sy-vline 
WA_MDEZ_DB_STR-ALINE sy-vline 
WA_MDEZ_DB_STR-ZLINE sy-vline 
WA_MDEZ_DB_STR-SELKZ sy-vline 
WA_MDEZ_DB_STR-ABEKZ sy-vline 
WA_MDEZ_DB_STR-VERID sy-vline 
WA_MDEZ_DB_STR-SERNR sy-vline 
WA_MDEZ_DB_STR-REVLV sy-vline 
WA_MDEZ_DB_STR-MNAUS sy-vline 
WA_MDEZ_DB_STR-DAT02 sy-vline 
WA_MDEZ_DB_STR-DAT03 sy-vline 
WA_MDEZ_DB_STR-SOBES sy-vline 
WA_MDEZ_DB_STR-ESOBS sy-vline 
WA_MDEZ_DB_STR-WRK01 sy-vline 
WA_MDEZ_DB_STR-WRK02 sy-vline 
WA_MDEZ_DB_STR-SLOC2 sy-vline 
WA_MDEZ_DB_STR-LGORT sy-vline 
WA_MDEZ_DB_STR-UMDAT sy-vline 
WA_MDEZ_DB_STR-LIFNR sy-vline 
WA_MDEZ_DB_STR-KUNNR sy-vline 
WA_MDEZ_DB_STR-MD4KD sy-vline 
WA_MDEZ_DB_STR-MD4LI sy-vline 
WA_MDEZ_DB_STR-LLMSG sy-vline 
WA_MDEZ_DB_STR-LLDLY sy-vline 
WA_MDEZ_DB_STR-TRAMG sy-vline 
WA_MDEZ_DB_STR-USEX1 sy-vline 
WA_MDEZ_DB_STR-USEX2 sy-vline 
WA_MDEZ_DB_STR-USEX3 sy-vline 
WA_MDEZ_DB_STR-SORT3 sy-vline 
WA_MDEZ_DB_STR-UNIV1 sy-vline 
WA_MDEZ_DB_STR-UNIV2 sy-vline 
WA_MDEZ_DB_STR-UNIV3 sy-vline 
WA_MDEZ_DB_STR-DETAIL_ICON sy-vline 
WA_MDEZ_DB_STR-PRIO_URG sy-vline 
WA_MDEZ_DB_STR-PRIO_REQ sy-vline 
WA_MDEZ_DB_STR-MDMAT sy-vline 
WA_MDEZ_DB_STR-MDLOC sy-vline 
WA_MDEZ_DB_STR-MDWRK sy-vline 
WA_MDEZ_DB_STR-MDBER sy-vline 
WA_MDEZ_DB_STR-SGT_RCAT sy-vline 
WA_MDEZ_DB_STR-SGT_SCAT sy-vline 
WA_MDEZ_DB_STR-MPNMT sy-vline      INTO ld_text SEPARATED BY SPACE.

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