ABAP Select data from SAP table CSL_MTLK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSL_MTLK
*  INTO TABLE @DATA(IT_CSL_MTLK2).
*--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_CSL_MTLK INDEX 1 INTO DATA(WA_CSL_MTLK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSL_MTLK>-MSY = 1.
<CSL_MTLK>-MNU = 1.
<CSL_MTLK>-T = 1.
<CSL_MTLK>-MTLKST = 1.
<CSL_MTLK>-MVINU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSL_MTLK-MVITS, sy-vline,
  WA_CSL_MTLK-MVISRSY, sy-vline,
  WA_CSL_MTLK-MVISRNU, sy-vline,
  WA_CSL_MTLK-MVICSH, sy-vline,
  WA_CSL_MTLK-MVICST, sy-vline,
  WA_CSL_MTLK-MVONU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSL_MTLK 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_CSL_MTLK 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_CSL_MTLK INTO WA_CSL_MTLK.


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

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

*Conversion exit ALPHA, internal->external for field MVODSSY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CSL_MTLK-MVODSSY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CSL_MTLK-MVODSSY.
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_CSL_MTLK_STR, 
MSY TYPE STRING,
MNU TYPE STRING,
T TYPE STRING,
MTLKST TYPE STRING,
MVINU TYPE STRING,
MVITS TYPE STRING,
MVISRSY TYPE STRING,
MVISRNU TYPE STRING,
MVICSH TYPE STRING,
MVICST TYPE STRING,
MVONU TYPE STRING,
MVOTS TYPE STRING,
MVODSSY TYPE STRING,
MVODSNU TYPE STRING,
MVOCSH TYPE STRING,
MVOCST TYPE STRING,
LLUW TYPE STRING,
LNU TYPE STRING,
LTS TYPE STRING,
LUS TYPE STRING,
LMI TYPE STRING,
LRCNT TYPE STRING,
TWRKY TYPE STRING,
TWRTS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSL_MTLK_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_CSL_MTLK_STR-MSY sy-vline 
WA_CSL_MTLK_STR-MNU sy-vline 
WA_CSL_MTLK_STR-T sy-vline 
WA_CSL_MTLK_STR-MTLKST sy-vline 
WA_CSL_MTLK_STR-MVINU sy-vline 
WA_CSL_MTLK_STR-MVITS sy-vline 
WA_CSL_MTLK_STR-MVISRSY sy-vline 
WA_CSL_MTLK_STR-MVISRNU sy-vline 
WA_CSL_MTLK_STR-MVICSH sy-vline 
WA_CSL_MTLK_STR-MVICST sy-vline 
WA_CSL_MTLK_STR-MVONU sy-vline 
WA_CSL_MTLK_STR-MVOTS sy-vline 
WA_CSL_MTLK_STR-MVODSSY sy-vline 
WA_CSL_MTLK_STR-MVODSNU sy-vline 
WA_CSL_MTLK_STR-MVOCSH sy-vline 
WA_CSL_MTLK_STR-MVOCST sy-vline 
WA_CSL_MTLK_STR-LLUW sy-vline 
WA_CSL_MTLK_STR-LNU sy-vline 
WA_CSL_MTLK_STR-LTS sy-vline 
WA_CSL_MTLK_STR-LUS sy-vline 
WA_CSL_MTLK_STR-LMI sy-vline 
WA_CSL_MTLK_STR-LRCNT sy-vline 
WA_CSL_MTLK_STR-TWRKY sy-vline 
WA_CSL_MTLK_STR-TWRTS sy-vline      INTO ld_text SEPARATED BY SPACE.

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