ABAP Select data from SAP table DDMSCHK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DDMSCHK
*  INTO TABLE @DATA(IT_DDMSCHK2).
*--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_DDMSCHK INDEX 1 INTO DATA(WA_DDMSCHK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DDMSCHK>-CHK_DD_DB = 1.
<DDMSCHK>-DB_NODD = 1.
<DDMSCHK>-CHK_DD_NT = 1.
<DDMSCHK>-NT_NODD = 1.
<DDMSCHK>-ACT_DD_NT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DDMSCHK-CHK_DEP, sy-vline,
  WA_DDMSCHK-ACT_DEP, sy-vline,
  WA_DDMSCHK-CHK_NEW, sy-vline,
  WA_DDMSCHK-ACT_NEW, sy-vline,
  WA_DDMSCHK-CHK_ACT, sy-vline,
  WA_DDMSCHK-CHK_COM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DDMSCHK 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_DDMSCHK 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_DDMSCHK INTO WA_DDMSCHK.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DDMSCHK_STR, 
CHK_DD_DB TYPE STRING,
DB_NODD TYPE STRING,
CHK_DD_NT TYPE STRING,
NT_NODD TYPE STRING,
ACT_DD_NT TYPE STRING,
CHK_DEP TYPE STRING,
ACT_DEP TYPE STRING,
CHK_NEW TYPE STRING,
ACT_NEW TYPE STRING,
CHK_ACT TYPE STRING,
CHK_COM TYPE STRING,
NOTESTDEVC TYPE STRING,
APPL TYPE STRING,
WEEKEND TYPE STRING,
WKREFDAY TYPE STRING,
WKREFTIME TYPE STRING,
MISSING TYPE STRING,
EXTERNAL TYPE STRING,
RESPERC TYPE STRING,
MAXTASKS TYPE STRING,
JOB_DIFF TYPE STRING,
JOB_DATE TYPE STRING,
JOB_TIME TYPE STRING,
IMMEDIATE TYPE STRING,
RES_TODO TYPE STRING,
RES_MLP TYPE STRING,
RES_MLPUSR TYPE STRING,
TRKORR TYPE STRING,
PURIFY1 TYPE STRING,
PURIFY2 TYPE STRING,
PURIFY3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DDMSCHK_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_DDMSCHK_STR-CHK_DD_DB sy-vline 
WA_DDMSCHK_STR-DB_NODD sy-vline 
WA_DDMSCHK_STR-CHK_DD_NT sy-vline 
WA_DDMSCHK_STR-NT_NODD sy-vline 
WA_DDMSCHK_STR-ACT_DD_NT sy-vline 
WA_DDMSCHK_STR-CHK_DEP sy-vline 
WA_DDMSCHK_STR-ACT_DEP sy-vline 
WA_DDMSCHK_STR-CHK_NEW sy-vline 
WA_DDMSCHK_STR-ACT_NEW sy-vline 
WA_DDMSCHK_STR-CHK_ACT sy-vline 
WA_DDMSCHK_STR-CHK_COM sy-vline 
WA_DDMSCHK_STR-NOTESTDEVC sy-vline 
WA_DDMSCHK_STR-APPL sy-vline 
WA_DDMSCHK_STR-WEEKEND sy-vline 
WA_DDMSCHK_STR-WKREFDAY sy-vline 
WA_DDMSCHK_STR-WKREFTIME sy-vline 
WA_DDMSCHK_STR-MISSING sy-vline 
WA_DDMSCHK_STR-EXTERNAL sy-vline 
WA_DDMSCHK_STR-RESPERC sy-vline 
WA_DDMSCHK_STR-MAXTASKS sy-vline 
WA_DDMSCHK_STR-JOB_DIFF sy-vline 
WA_DDMSCHK_STR-JOB_DATE sy-vline 
WA_DDMSCHK_STR-JOB_TIME sy-vline 
WA_DDMSCHK_STR-IMMEDIATE sy-vline 
WA_DDMSCHK_STR-RES_TODO sy-vline 
WA_DDMSCHK_STR-RES_MLP sy-vline 
WA_DDMSCHK_STR-RES_MLPUSR sy-vline 
WA_DDMSCHK_STR-TRKORR sy-vline 
WA_DDMSCHK_STR-PURIFY1 sy-vline 
WA_DDMSCHK_STR-PURIFY2 sy-vline 
WA_DDMSCHK_STR-PURIFY3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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