ABAP Select data from SAP table CSMGENCUST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSMGENCUST
*  INTO TABLE @DATA(IT_CSMGENCUST2).
*--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_CSMGENCUST INDEX 1 INTO DATA(WA_CSMGENCUST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSMGENCUST>-MTSYSID = 1.
<CSMGENCUST>-MTMCNAME = 1.
<CSMGENCUST>-MTNUMRANGE = 1.
<CSMGENCUST>-MTUID = 1.
<CSMGENCUST>-MTCLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSMGENCUST-MTINDEX, sy-vline,
  WA_CSMGENCUST-EXTINDEX, sy-vline,
  WA_CSMGENCUST-CUSTSTATUS, sy-vline,
  WA_CSMGENCUST-USECLASS, sy-vline,
  WA_CSMGENCUST-SEVERITY, sy-vline,
  WA_CSMGENCUST-STATISTREC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSMGENCUST 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_CSMGENCUST 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_CSMGENCUST INTO WA_CSMGENCUST.


*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_CSMGENCUST_STR, 
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
MTINDEX TYPE STRING,
EXTINDEX TYPE STRING,
CUSTSTATUS TYPE STRING,
USECLASS TYPE STRING,
SEVERITY TYPE STRING,
STATISTREC TYPE STRING,
VISUSERLEV TYPE STRING,
KEEPALTYPE TYPE STRING,
KEEPALMAX TYPE STRING,
SECTRGTOOL TYPE STRING,
SECINACTIV TYPE STRING,
WARMUPTIME TYPE STRING,
DTEXTCLASS TYPE STRING,
DTEXTID TYPE STRING,
CUSGRPNAME TYPE STRING,
DESCRTEXT TYPE STRING,
TRGTDEFNAM TYPE STRING,
TRGTDEFDSP TYPE STRING,
TRGTDEFSTA TYPE STRING,
TRGTDEFCOS TYPE STRING,
ANATDEFNAM TYPE STRING,
ANATDEFDSP TYPE STRING,
ANATDEFSTA TYPE STRING,
ANATDEFCOS TYPE STRING,
ONATDEFNAM TYPE STRING,
ONATDEFDSP TYPE STRING,
ONATDEFSTA TYPE STRING,
ONATDEFCOS TYPE STRING,
RC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSMGENCUST_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_CSMGENCUST_STR-MTSYSID sy-vline 
WA_CSMGENCUST_STR-MTMCNAME sy-vline 
WA_CSMGENCUST_STR-MTNUMRANGE sy-vline 
WA_CSMGENCUST_STR-MTUID sy-vline 
WA_CSMGENCUST_STR-MTCLASS sy-vline 
WA_CSMGENCUST_STR-MTINDEX sy-vline 
WA_CSMGENCUST_STR-EXTINDEX sy-vline 
WA_CSMGENCUST_STR-CUSTSTATUS sy-vline 
WA_CSMGENCUST_STR-USECLASS sy-vline 
WA_CSMGENCUST_STR-SEVERITY sy-vline 
WA_CSMGENCUST_STR-STATISTREC sy-vline 
WA_CSMGENCUST_STR-VISUSERLEV sy-vline 
WA_CSMGENCUST_STR-KEEPALTYPE sy-vline 
WA_CSMGENCUST_STR-KEEPALMAX sy-vline 
WA_CSMGENCUST_STR-SECTRGTOOL sy-vline 
WA_CSMGENCUST_STR-SECINACTIV sy-vline 
WA_CSMGENCUST_STR-WARMUPTIME sy-vline 
WA_CSMGENCUST_STR-DTEXTCLASS sy-vline 
WA_CSMGENCUST_STR-DTEXTID sy-vline 
WA_CSMGENCUST_STR-CUSGRPNAME sy-vline 
WA_CSMGENCUST_STR-DESCRTEXT sy-vline 
WA_CSMGENCUST_STR-TRGTDEFNAM sy-vline 
WA_CSMGENCUST_STR-TRGTDEFDSP sy-vline 
WA_CSMGENCUST_STR-TRGTDEFSTA sy-vline 
WA_CSMGENCUST_STR-TRGTDEFCOS sy-vline 
WA_CSMGENCUST_STR-ANATDEFNAM sy-vline 
WA_CSMGENCUST_STR-ANATDEFDSP sy-vline 
WA_CSMGENCUST_STR-ANATDEFSTA sy-vline 
WA_CSMGENCUST_STR-ANATDEFCOS sy-vline 
WA_CSMGENCUST_STR-ONATDEFNAM sy-vline 
WA_CSMGENCUST_STR-ONATDEFDSP sy-vline 
WA_CSMGENCUST_STR-ONATDEFSTA sy-vline 
WA_CSMGENCUST_STR-ONATDEFCOS sy-vline 
WA_CSMGENCUST_STR-RC sy-vline      INTO ld_text SEPARATED BY SPACE.

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