ABAP Select data from SAP table MLST_CLEAR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLST_CLEAR
*  INTO TABLE @DATA(IT_MLST_CLEAR2).
*--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_MLST_CLEAR INDEX 1 INTO DATA(WA_MLST_CLEAR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLST_CLEAR>-MLST_ZAEHL = 1.
<MLST_CLEAR>-USERH = 1.
<MLST_CLEAR>-DATEH = 1.
<MLST_CLEAR>-USERV = 1.
<MLST_CLEAR>-DATEV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLST_CLEAR-AUFPL, sy-vline,
  WA_MLST_CLEAR-APLZL, sy-vline,
  WA_MLST_CLEAR-TEDAT, sy-vline,
  WA_MLST_CLEAR-TETIM, sy-vline,
  WA_MLST_CLEAR-TPDAT, sy-vline,
  WA_MLST_CLEAR-TPTIM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLST_CLEAR 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_MLST_CLEAR 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_MLST_CLEAR INTO WA_MLST_CLEAR.


*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 AUFNR_T
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MLST_CLEAR-AUFNR_T
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLST_CLEAR-AUFNR_T.
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_MLST_CLEAR_STR, 
MLST_ZAEHL TYPE STRING,
USERH TYPE STRING,
DATEH TYPE STRING,
USERV TYPE STRING,
DATEV TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
TEDAT TYPE STRING,
TETIM TYPE STRING,
TPDAT TYPE STRING,
TPTIM TYPE STRING,
EDATU TYPE STRING,
EZEIT TYPE STRING,
PDATU TYPE STRING,
PZEIT TYPE STRING,
LST_ACTDT TYPE STRING,
LST_ACTTM TYPE STRING,
RUECK TYPE STRING,
RMZHL TYPE STRING,
MLTX_ZAEHL TYPE STRING,
FLG_SEL TYPE STRING,
AUFNR_T TYPE STRING,
VBKZ_MLST TYPE STRING,
VBKZ_MLTX TYPE STRING,
RELSU_AL TYPE STRING,
RELMS_AL TYPE STRING,
INCPN_AL TYPE STRING,
INCNW_AL TYPE STRING,
INCSN_AL TYPE STRING,
WKFLW_AL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLST_CLEAR_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_MLST_CLEAR_STR-MLST_ZAEHL sy-vline 
WA_MLST_CLEAR_STR-USERH sy-vline 
WA_MLST_CLEAR_STR-DATEH sy-vline 
WA_MLST_CLEAR_STR-USERV sy-vline 
WA_MLST_CLEAR_STR-DATEV sy-vline 
WA_MLST_CLEAR_STR-AUFPL sy-vline 
WA_MLST_CLEAR_STR-APLZL sy-vline 
WA_MLST_CLEAR_STR-TEDAT sy-vline 
WA_MLST_CLEAR_STR-TETIM sy-vline 
WA_MLST_CLEAR_STR-TPDAT sy-vline 
WA_MLST_CLEAR_STR-TPTIM sy-vline 
WA_MLST_CLEAR_STR-EDATU sy-vline 
WA_MLST_CLEAR_STR-EZEIT sy-vline 
WA_MLST_CLEAR_STR-PDATU sy-vline 
WA_MLST_CLEAR_STR-PZEIT sy-vline 
WA_MLST_CLEAR_STR-LST_ACTDT sy-vline 
WA_MLST_CLEAR_STR-LST_ACTTM sy-vline 
WA_MLST_CLEAR_STR-RUECK sy-vline 
WA_MLST_CLEAR_STR-RMZHL sy-vline 
WA_MLST_CLEAR_STR-MLTX_ZAEHL sy-vline 
WA_MLST_CLEAR_STR-FLG_SEL sy-vline 
WA_MLST_CLEAR_STR-AUFNR_T sy-vline 
WA_MLST_CLEAR_STR-VBKZ_MLST sy-vline 
WA_MLST_CLEAR_STR-VBKZ_MLTX sy-vline 
WA_MLST_CLEAR_STR-RELSU_AL sy-vline 
WA_MLST_CLEAR_STR-RELMS_AL sy-vline 
WA_MLST_CLEAR_STR-INCPN_AL sy-vline 
WA_MLST_CLEAR_STR-INCNW_AL sy-vline 
WA_MLST_CLEAR_STR-INCSN_AL sy-vline 
WA_MLST_CLEAR_STR-WKFLW_AL sy-vline      INTO ld_text SEPARATED BY SPACE.

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