ABAP Select data from SAP table CUST1000 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CUST1000 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 CUST1000. 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 CUST1000 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_CUST1000 TYPE STANDARD TABLE OF CUST1000,
      WA_CUST1000 TYPE CUST1000,
      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: <CUST1000> TYPE CUST1000.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CUST1000.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CUST1000
  INTO TABLE IT_CUST1000.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CUST1000
*  INTO TABLE @DATA(IT_CUST10002).
*--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_CUST1000 INDEX 1 INTO DATA(WA_CUST10002).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CUST1000 ASSIGNING <CUST1000>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CUST1000>-SETNAME = 1.
<CUST1000>-CUSTCLASS = 1.
<CUST1000>-CUSTGROUP = 1.
<CUST1000>-CUSTTID = 1.
<CUST1000>-TOOLCLASS = 1.

ENDLOOP.

LOOP AT IT_CUST1000 INTO WA_CUST1000.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CUST1000-TOOLMT, sy-vline,
  WA_CUST1000-TOOLDEFINE, sy-vline,
  WA_CUST1000-TOOLRELE, sy-vline,
  WA_CUST1000-VARILIST, sy-vline,
  WA_CUST1000-SEGMENTS, sy-vline,
  WA_CUST1000-CONTEXTS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CUST1000 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_CUST1000 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_CUST1000 INTO WA_CUST1000.


*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_CUST1000_STR, 
SETNAME TYPE STRING,
CUSTCLASS TYPE STRING,
CUSTGROUP TYPE STRING,
CUSTTID TYPE STRING,
TOOLCLASS TYPE STRING,
TOOLMT TYPE STRING,
TOOLDEFINE TYPE STRING,
TOOLRELE TYPE STRING,
VARILIST TYPE STRING,
SEGMENTS TYPE STRING,
CONTEXTS TYPE STRING,
SYSTEMS TYPE STRING,
SEGMENT TYPE STRING,
CONTEXT TYPE STRING,
SR_AGENT TYPE STRING,
4X_AGENT TYPE STRING,
3X_AGENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CUST1000_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_CUST1000_STR-SETNAME sy-vline 
WA_CUST1000_STR-CUSTCLASS sy-vline 
WA_CUST1000_STR-CUSTGROUP sy-vline 
WA_CUST1000_STR-CUSTTID sy-vline 
WA_CUST1000_STR-TOOLCLASS sy-vline 
WA_CUST1000_STR-TOOLMT sy-vline 
WA_CUST1000_STR-TOOLDEFINE sy-vline 
WA_CUST1000_STR-TOOLRELE sy-vline 
WA_CUST1000_STR-VARILIST sy-vline 
WA_CUST1000_STR-SEGMENTS sy-vline 
WA_CUST1000_STR-CONTEXTS sy-vline 
WA_CUST1000_STR-SYSTEMS sy-vline 
WA_CUST1000_STR-SEGMENT sy-vline 
WA_CUST1000_STR-CONTEXT sy-vline 
WA_CUST1000_STR-SR_AGENT sy-vline 
WA_CUST1000_STR-4X_AGENT sy-vline 
WA_CUST1000_STR-3X_AGENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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