ABAP Select data from SAP table MEKET into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEKET
*  INTO TABLE @DATA(IT_MEKET2).
*--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_MEKET INDEX 1 INTO DATA(WA_MEKET2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEKET>-EBELN = 1.
<MEKET>-EBELP = 1.
<MEKET>-ETENR = 1.
<MEKET>-EINDT = 1.
<MEKET>-LPEIN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEKET-MENGE, sy-vline,
  WA_MEKET-UZEIT, sy-vline,
  WA_MEKET-BANFN, sy-vline,
  WA_MEKET-BNFPO, sy-vline,
  WA_MEKET-ESTKZ, sy-vline,
  WA_MEKET-BEDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEKET 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_MEKET 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_MEKET INTO WA_MEKET.


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

*Conversion exit ALPHA, internal->external for field BANFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEKET-BANFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEKET-BANFN.
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_MEKET_STR, 
EBELN TYPE STRING,
EBELP TYPE STRING,
ETENR TYPE STRING,
EINDT TYPE STRING,
LPEIN TYPE STRING,
MENGE TYPE STRING,
UZEIT TYPE STRING,
BANFN TYPE STRING,
BNFPO TYPE STRING,
ESTKZ TYPE STRING,
BEDAT TYPE STRING,
FIXKZ TYPE STRING,
MNG02 TYPE STRING,
DAT01 TYPE STRING,
AULWE TYPE STRING,
MBDAT TYPE STRING,
MBUHR TYPE STRING,
LDDAT TYPE STRING,
LDUHR TYPE STRING,
TDDAT TYPE STRING,
TDUHR TYPE STRING,
WADAT TYPE STRING,
WAUHR TYPE STRING,
RSNUM TYPE STRING,
ELDAT TYPE STRING,
ELUHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEKET_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_MEKET_STR-EBELN sy-vline 
WA_MEKET_STR-EBELP sy-vline 
WA_MEKET_STR-ETENR sy-vline 
WA_MEKET_STR-EINDT sy-vline 
WA_MEKET_STR-LPEIN sy-vline 
WA_MEKET_STR-MENGE sy-vline 
WA_MEKET_STR-UZEIT sy-vline 
WA_MEKET_STR-BANFN sy-vline 
WA_MEKET_STR-BNFPO sy-vline 
WA_MEKET_STR-ESTKZ sy-vline 
WA_MEKET_STR-BEDAT sy-vline 
WA_MEKET_STR-FIXKZ sy-vline 
WA_MEKET_STR-MNG02 sy-vline 
WA_MEKET_STR-DAT01 sy-vline 
WA_MEKET_STR-AULWE sy-vline 
WA_MEKET_STR-MBDAT sy-vline 
WA_MEKET_STR-MBUHR sy-vline 
WA_MEKET_STR-LDDAT sy-vline 
WA_MEKET_STR-LDUHR sy-vline 
WA_MEKET_STR-TDDAT sy-vline 
WA_MEKET_STR-TDUHR sy-vline 
WA_MEKET_STR-WADAT sy-vline 
WA_MEKET_STR-WAUHR sy-vline 
WA_MEKET_STR-RSNUM sy-vline 
WA_MEKET_STR-ELDAT sy-vline 
WA_MEKET_STR-ELUHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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