ABAP Select data from SAP table CKML_MANCHANG_TREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CKML_MANCHANG_TREE
*  INTO TABLE @DATA(IT_CKML_MANCHANG_TREE2).
*--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_CKML_MANCHANG_TREE INDEX 1 INTO DATA(WA_CKML_MANCHANG_TREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CKML_MANCHANG_TREE>-LEVEL = 1.
<CKML_MANCHANG_TREE>-NODE_KEY = 1.
<CKML_MANCHANG_TREE>-NTEXT = 1.
<CKML_MANCHANG_TREE>-SORT_ID = 1.
<CKML_MANCHANG_TREE>-CCS_CHANGEABLE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CKML_MANCHANG_TREE-NODE_STYLE, sy-vline,
  WA_CKML_MANCHANG_TREE-MANDT, sy-vline,
  WA_CKML_MANCHANG_TREE-KALNR, sy-vline,
  WA_CKML_MANCHANG_TREE-BDATJ, sy-vline,
  WA_CKML_MANCHANG_TREE-POPER, sy-vline,
  WA_CKML_MANCHANG_TREE-UNTPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CKML_MANCHANG_TREE 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_CKML_MANCHANG_TREE 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_CKML_MANCHANG_TREE INTO WA_CKML_MANCHANG_TREE.


*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 GJAHR, internal->external for field BDATJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CKML_MANCHANG_TREE-BDATJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CKML_MANCHANG_TREE-BDATJ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CKML_MANCHANG_TREE-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CKML_MANCHANG_TREE-MEINS.
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_CKML_MANCHANG_TREE_STR, 
LEVEL TYPE STRING,
NODE_KEY TYPE STRING,
NTEXT TYPE STRING,
SORT_ID TYPE STRING,
CCS_CHANGEABLE TYPE STRING,
NODE_STYLE TYPE STRING,
MANDT TYPE STRING,
KALNR TYPE STRING,
BDATJ TYPE STRING,
POPER TYPE STRING,
UNTPER TYPE STRING,
CATEG TYPE STRING,
PTYP TYPE STRING,
BVALT TYPE STRING,
CURTP TYPE STRING,
LBKUM TYPE STRING,
MEINS TYPE STRING,
SALK3 TYPE STRING,
ESTPRD TYPE STRING,
ESTKDM TYPE STRING,
MSTPRD TYPE STRING,
MSTKDM TYPE STRING,
WAERS TYPE STRING,
TPPRD TYPE STRING,
ESTKDM_ST TYPE STRING,
SALK3_2 TYPE STRING,
SALK3_3 TYPE STRING,
WAERS_2 TYPE STRING,
WAERS_3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CKML_MANCHANG_TREE_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_CKML_MANCHANG_TREE_STR-LEVEL sy-vline 
WA_CKML_MANCHANG_TREE_STR-NODE_KEY sy-vline 
WA_CKML_MANCHANG_TREE_STR-NTEXT sy-vline 
WA_CKML_MANCHANG_TREE_STR-SORT_ID sy-vline 
WA_CKML_MANCHANG_TREE_STR-CCS_CHANGEABLE sy-vline 
WA_CKML_MANCHANG_TREE_STR-NODE_STYLE sy-vline 
WA_CKML_MANCHANG_TREE_STR-MANDT sy-vline 
WA_CKML_MANCHANG_TREE_STR-KALNR sy-vline 
WA_CKML_MANCHANG_TREE_STR-BDATJ sy-vline 
WA_CKML_MANCHANG_TREE_STR-POPER sy-vline 
WA_CKML_MANCHANG_TREE_STR-UNTPER sy-vline 
WA_CKML_MANCHANG_TREE_STR-CATEG sy-vline 
WA_CKML_MANCHANG_TREE_STR-PTYP sy-vline 
WA_CKML_MANCHANG_TREE_STR-BVALT sy-vline 
WA_CKML_MANCHANG_TREE_STR-CURTP sy-vline 
WA_CKML_MANCHANG_TREE_STR-LBKUM sy-vline 
WA_CKML_MANCHANG_TREE_STR-MEINS sy-vline 
WA_CKML_MANCHANG_TREE_STR-SALK3 sy-vline 
WA_CKML_MANCHANG_TREE_STR-ESTPRD sy-vline 
WA_CKML_MANCHANG_TREE_STR-ESTKDM sy-vline 
WA_CKML_MANCHANG_TREE_STR-MSTPRD sy-vline 
WA_CKML_MANCHANG_TREE_STR-MSTKDM sy-vline 
WA_CKML_MANCHANG_TREE_STR-WAERS sy-vline 
WA_CKML_MANCHANG_TREE_STR-TPPRD sy-vline 
WA_CKML_MANCHANG_TREE_STR-ESTKDM_ST sy-vline 
WA_CKML_MANCHANG_TREE_STR-SALK3_2 sy-vline 
WA_CKML_MANCHANG_TREE_STR-SALK3_3 sy-vline 
WA_CKML_MANCHANG_TREE_STR-WAERS_2 sy-vline 
WA_CKML_MANCHANG_TREE_STR-WAERS_3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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