ABAP Select data from SAP table GTCUSTOMER_TYPE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GTCUSTOMER_TYPE
*  INTO TABLE @DATA(IT_GTCUSTOMER_TYPE2).
*--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_GTCUSTOMER_TYPE INDEX 1 INTO DATA(WA_GTCUSTOMER_TYPE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GTCUSTOMER_TYPE>-CONTROLLER = 1.
<GTCUSTOMER_TYPE>-PERSON_NAME = 1.
<GTCUSTOMER_TYPE>-CONTROLLER = 1.
<GTCUSTOMER_TYPE>-NAME_PREFIX = 1.
<GTCUSTOMER_TYPE>-GIVEN_NAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GTCUSTOMER_TYPE-MIDDLE_NAME, sy-vline,
  WA_GTCUSTOMER_TYPE-SUR_NAME, sy-vline,
  WA_GTCUSTOMER_TYPE-NAME_SUFFIX, sy-vline,
  WA_GTCUSTOMER_TYPE-PREFERRED_FIRST_NAME, sy-vline,
  WA_GTCUSTOMER_TYPE-PREFERRED_SURNAME, sy-vline,
  WA_GTCUSTOMER_TYPE-DATA_SOURCE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GTCUSTOMER_TYPE 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_GTCUSTOMER_TYPE 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_GTCUSTOMER_TYPE INTO WA_GTCUSTOMER_TYPE.


*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_GTCUSTOMER_TYPE_STR, 
CONTROLLER TYPE STRING,
PERSON_NAME TYPE STRING,
CONTROLLER TYPE STRING,
NAME_PREFIX TYPE STRING,
GIVEN_NAME TYPE STRING,
MIDDLE_NAME TYPE STRING,
SUR_NAME TYPE STRING,
NAME_SUFFIX TYPE STRING,
PREFERRED_FIRST_NAME TYPE STRING,
PREFERRED_SURNAME TYPE STRING,
DATA_SOURCE TYPE STRING,
CONTROLLER TYPE STRING,
PRIMARY_DS TYPE STRING,
TRANSACTIONAL_DATA TYPE STRING,
CONTROLLER TYPE STRING,
TEMPLATE_GROUP_NAME TYPE STRING,
LANGUAGE_ID TYPE STRING,
TEMPLATE_SUBJECT_AREA_COUNT TYPE STRING,
TELEPHONE TYPE STRING,
EMAIL TYPE STRING,
ADDRESS TYPE STRING,
PAYMENT_FORM TYPE STRING,
RELATED_INDIVIDUAL TYPE STRING,
EMERGENCY_CONTACT_PERSON TYPE STRING,
DOCUMENT TYPE STRING,
CUST_LOYALTY TYPE STRING,
EMPLOYMENT_INFO TYPE STRING,
BIRTH_DATE TYPE STRING,
MARITAL_STATUS_CODE TYPE STRING,
GENDER_CODE TYPE STRING,
AGE_RANGE TYPE STRING,
SFP_BIRTH_MONTH TYPE STRING,
SFP_BIRTH_DAY TYPE STRING,
SFP_BIRTH_YEAR TYPE STRING,
SFP_REDRESS_NUMBER TYPE STRING,
SFP_KNOWN_TRAVELER_NUMBER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GTCUSTOMER_TYPE_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_GTCUSTOMER_TYPE_STR-CONTROLLER sy-vline 
WA_GTCUSTOMER_TYPE_STR-PERSON_NAME sy-vline 
WA_GTCUSTOMER_TYPE_STR-CONTROLLER sy-vline 
WA_GTCUSTOMER_TYPE_STR-NAME_PREFIX sy-vline 
WA_GTCUSTOMER_TYPE_STR-GIVEN_NAME sy-vline 
WA_GTCUSTOMER_TYPE_STR-MIDDLE_NAME sy-vline 
WA_GTCUSTOMER_TYPE_STR-SUR_NAME sy-vline 
WA_GTCUSTOMER_TYPE_STR-NAME_SUFFIX sy-vline 
WA_GTCUSTOMER_TYPE_STR-PREFERRED_FIRST_NAME sy-vline 
WA_GTCUSTOMER_TYPE_STR-PREFERRED_SURNAME sy-vline 
WA_GTCUSTOMER_TYPE_STR-DATA_SOURCE sy-vline 
WA_GTCUSTOMER_TYPE_STR-CONTROLLER sy-vline 
WA_GTCUSTOMER_TYPE_STR-PRIMARY_DS sy-vline 
WA_GTCUSTOMER_TYPE_STR-TRANSACTIONAL_DATA sy-vline 
WA_GTCUSTOMER_TYPE_STR-CONTROLLER sy-vline 
WA_GTCUSTOMER_TYPE_STR-TEMPLATE_GROUP_NAME sy-vline 
WA_GTCUSTOMER_TYPE_STR-LANGUAGE_ID sy-vline 
WA_GTCUSTOMER_TYPE_STR-TEMPLATE_SUBJECT_AREA_COUNT sy-vline 
WA_GTCUSTOMER_TYPE_STR-TELEPHONE sy-vline 
WA_GTCUSTOMER_TYPE_STR-EMAIL sy-vline 
WA_GTCUSTOMER_TYPE_STR-ADDRESS sy-vline 
WA_GTCUSTOMER_TYPE_STR-PAYMENT_FORM sy-vline 
WA_GTCUSTOMER_TYPE_STR-RELATED_INDIVIDUAL sy-vline 
WA_GTCUSTOMER_TYPE_STR-EMERGENCY_CONTACT_PERSON sy-vline 
WA_GTCUSTOMER_TYPE_STR-DOCUMENT sy-vline 
WA_GTCUSTOMER_TYPE_STR-CUST_LOYALTY sy-vline 
WA_GTCUSTOMER_TYPE_STR-EMPLOYMENT_INFO sy-vline 
WA_GTCUSTOMER_TYPE_STR-BIRTH_DATE sy-vline 
WA_GTCUSTOMER_TYPE_STR-MARITAL_STATUS_CODE sy-vline 
WA_GTCUSTOMER_TYPE_STR-GENDER_CODE sy-vline 
WA_GTCUSTOMER_TYPE_STR-AGE_RANGE sy-vline 
WA_GTCUSTOMER_TYPE_STR-SFP_BIRTH_MONTH sy-vline 
WA_GTCUSTOMER_TYPE_STR-SFP_BIRTH_DAY sy-vline 
WA_GTCUSTOMER_TYPE_STR-SFP_BIRTH_YEAR sy-vline 
WA_GTCUSTOMER_TYPE_STR-SFP_REDRESS_NUMBER sy-vline 
WA_GTCUSTOMER_TYPE_STR-SFP_KNOWN_TRAVELER_NUMBER sy-vline      INTO ld_text SEPARATED BY SPACE.

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