ABAP Select data from SAP table CRM_KNA1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CRM_KNA1 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 CRM_KNA1. 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 CRM_KNA1 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_CRM_KNA1 TYPE STANDARD TABLE OF CRM_KNA1,
      WA_CRM_KNA1 TYPE CRM_KNA1,
      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: <CRM_KNA1> TYPE CRM_KNA1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CRM_KNA1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CRM_KNA1
  INTO TABLE IT_CRM_KNA1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CRM_KNA1
*  INTO TABLE @DATA(IT_CRM_KNA12).
*--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_CRM_KNA1 INDEX 1 INTO DATA(WA_CRM_KNA12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CRM_KNA1 ASSIGNING <CRM_KNA1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CRM_KNA1>-BUPA_GUID = 1.
<CRM_KNA1>-KUNNR = 1.
<CRM_KNA1>-TASK = 1.
<CRM_KNA1>-NIELS = 1.
<CRM_KNA1>-KUKLA = 1.

ENDLOOP.

LOOP AT IT_CRM_KNA1 INTO WA_CRM_KNA1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CRM_KNA1-UMSA1, sy-vline,
  WA_CRM_KNA1-UMJAH, sy-vline,
  WA_CRM_KNA1-UWAER, sy-vline,
  WA_CRM_KNA1-JMZAH, sy-vline,
  WA_CRM_KNA1-JMJAH, sy-vline,
  WA_CRM_KNA1-SPERZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CRM_KNA1 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_CRM_KNA1 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_CRM_KNA1 INTO WA_CRM_KNA1.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CRM_KNA1-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CRM_KNA1-KUNNR.
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_CRM_KNA1_STR, 
BUPA_GUID TYPE STRING,
KUNNR TYPE STRING,
TASK TYPE STRING,
NIELS TYPE STRING,
KUKLA TYPE STRING,
UMSA1 TYPE STRING,
UMJAH TYPE STRING,
UWAER TYPE STRING,
JMZAH TYPE STRING,
JMJAH TYPE STRING,
SPERZ TYPE STRING,
SPERR TYPE STRING,
KATR1 TYPE STRING,
KATR2 TYPE STRING,
KATR3 TYPE STRING,
KATR4 TYPE STRING,
KATR5 TYPE STRING,
KATR6 TYPE STRING,
KATR7 TYPE STRING,
KATR8 TYPE STRING,
KATR9 TYPE STRING,
KATR10 TYPE STRING,
WERKS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CRM_KNA1_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_CRM_KNA1_STR-BUPA_GUID sy-vline 
WA_CRM_KNA1_STR-KUNNR sy-vline 
WA_CRM_KNA1_STR-TASK sy-vline 
WA_CRM_KNA1_STR-NIELS sy-vline 
WA_CRM_KNA1_STR-KUKLA sy-vline 
WA_CRM_KNA1_STR-UMSA1 sy-vline 
WA_CRM_KNA1_STR-UMJAH sy-vline 
WA_CRM_KNA1_STR-UWAER sy-vline 
WA_CRM_KNA1_STR-JMZAH sy-vline 
WA_CRM_KNA1_STR-JMJAH sy-vline 
WA_CRM_KNA1_STR-SPERZ sy-vline 
WA_CRM_KNA1_STR-SPERR sy-vline 
WA_CRM_KNA1_STR-KATR1 sy-vline 
WA_CRM_KNA1_STR-KATR2 sy-vline 
WA_CRM_KNA1_STR-KATR3 sy-vline 
WA_CRM_KNA1_STR-KATR4 sy-vline 
WA_CRM_KNA1_STR-KATR5 sy-vline 
WA_CRM_KNA1_STR-KATR6 sy-vline 
WA_CRM_KNA1_STR-KATR7 sy-vline 
WA_CRM_KNA1_STR-KATR8 sy-vline 
WA_CRM_KNA1_STR-KATR9 sy-vline 
WA_CRM_KNA1_STR-KATR10 sy-vline 
WA_CRM_KNA1_STR-WERKS sy-vline      INTO ld_text SEPARATED BY SPACE.

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