ABAP Select data from SAP table QAMS_PD_HEAD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QAMS_PD_HEAD
*  INTO TABLE @DATA(IT_QAMS_PD_HEAD2).
*--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_QAMS_PD_HEAD INDEX 1 INTO DATA(WA_QAMS_PD_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QAMS_PD_HEAD>-NEW_PAGE = 1.
<QAMS_PD_HEAD>-COUNTRY = 1.
<QAMS_PD_HEAD>-LOGO = 1.
<QAMS_PD_HEAD>-TYPE_DESCR = 1.
<QAMS_PD_HEAD>-ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QAMS_PD_HEAD-REFNO, sy-vline,
  WA_QAMS_PD_HEAD-TITLE_8D, sy-vline,
  WA_QAMS_PD_HEAD-CRE_START_DATE, sy-vline,
  WA_QAMS_PD_HEAD-REP_START_DATE, sy-vline,
  WA_QAMS_PD_HEAD-PHASE_TXT_HEAD, sy-vline,
  WA_QAMS_PD_HEAD-PHASE_TXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QAMS_PD_HEAD 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_QAMS_PD_HEAD 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_QAMS_PD_HEAD INTO WA_QAMS_PD_HEAD.


*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 ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QAMS_PD_HEAD-ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QAMS_PD_HEAD-ID.
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_QAMS_PD_HEAD_STR, 
NEW_PAGE TYPE STRING,
COUNTRY TYPE STRING,
LOGO TYPE STRING,
TYPE_DESCR TYPE STRING,
ID TYPE STRING,
REFNO TYPE STRING,
TITLE_8D TYPE STRING,
CRE_START_DATE TYPE STRING,
REP_START_DATE TYPE STRING,
PHASE_TXT_HEAD TYPE STRING,
PHASE_TXT TYPE STRING,
D1 TYPE STRING,
D2 TYPE STRING,
D3 TYPE STRING,
D4 TYPE STRING,
D5 TYPE STRING,
D6 TYPE STRING,
D7 TYPE STRING,
D8 TYPE STRING,
PHASE_ACTIVE TYPE STRING,
D1 TYPE STRING,
D2 TYPE STRING,
D3 TYPE STRING,
D4 TYPE STRING,
D5 TYPE STRING,
D6 TYPE STRING,
D7 TYPE STRING,
D8 TYPE STRING,
STATUS TYPE STRING,
D1 TYPE STRING,
D2 TYPE STRING,
D3 TYPE STRING,
D4 TYPE STRING,
D5 TYPE STRING,
D6 TYPE STRING,
D7 TYPE STRING,
D8 TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
REF_OBJ_NAME_TXT TYPE STRING,
REF_OBJ_ID TYPE STRING,
REF_OBJ_NAME TYPE STRING,
CONTACT_NAME TYPE STRING,
CONTACT_ADR TYPE STRING,
CONTACT_TEL TYPE STRING,
CONTACT_FAX TYPE STRING,
CONTACT_EMAIL TYPE STRING,
ATT_NO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QAMS_PD_HEAD_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_QAMS_PD_HEAD_STR-NEW_PAGE sy-vline 
WA_QAMS_PD_HEAD_STR-COUNTRY sy-vline 
WA_QAMS_PD_HEAD_STR-LOGO sy-vline 
WA_QAMS_PD_HEAD_STR-TYPE_DESCR sy-vline 
WA_QAMS_PD_HEAD_STR-ID sy-vline 
WA_QAMS_PD_HEAD_STR-REFNO sy-vline 
WA_QAMS_PD_HEAD_STR-TITLE_8D sy-vline 
WA_QAMS_PD_HEAD_STR-CRE_START_DATE sy-vline 
WA_QAMS_PD_HEAD_STR-REP_START_DATE sy-vline 
WA_QAMS_PD_HEAD_STR-PHASE_TXT_HEAD sy-vline 
WA_QAMS_PD_HEAD_STR-PHASE_TXT sy-vline 
WA_QAMS_PD_HEAD_STR-D1 sy-vline 
WA_QAMS_PD_HEAD_STR-D2 sy-vline 
WA_QAMS_PD_HEAD_STR-D3 sy-vline 
WA_QAMS_PD_HEAD_STR-D4 sy-vline 
WA_QAMS_PD_HEAD_STR-D5 sy-vline 
WA_QAMS_PD_HEAD_STR-D6 sy-vline 
WA_QAMS_PD_HEAD_STR-D7 sy-vline 
WA_QAMS_PD_HEAD_STR-D8 sy-vline 
WA_QAMS_PD_HEAD_STR-PHASE_ACTIVE sy-vline 
WA_QAMS_PD_HEAD_STR-D1 sy-vline 
WA_QAMS_PD_HEAD_STR-D2 sy-vline 
WA_QAMS_PD_HEAD_STR-D3 sy-vline 
WA_QAMS_PD_HEAD_STR-D4 sy-vline 
WA_QAMS_PD_HEAD_STR-D5 sy-vline 
WA_QAMS_PD_HEAD_STR-D6 sy-vline 
WA_QAMS_PD_HEAD_STR-D7 sy-vline 
WA_QAMS_PD_HEAD_STR-D8 sy-vline 
WA_QAMS_PD_HEAD_STR-STATUS sy-vline 
WA_QAMS_PD_HEAD_STR-D1 sy-vline 
WA_QAMS_PD_HEAD_STR-D2 sy-vline 
WA_QAMS_PD_HEAD_STR-D3 sy-vline 
WA_QAMS_PD_HEAD_STR-D4 sy-vline 
WA_QAMS_PD_HEAD_STR-D5 sy-vline 
WA_QAMS_PD_HEAD_STR-D6 sy-vline 
WA_QAMS_PD_HEAD_STR-D7 sy-vline 
WA_QAMS_PD_HEAD_STR-D8 sy-vline 
WA_QAMS_PD_HEAD_STR-MATNR sy-vline 
WA_QAMS_PD_HEAD_STR-MAKTX sy-vline 
WA_QAMS_PD_HEAD_STR-REF_OBJ_NAME_TXT sy-vline 
WA_QAMS_PD_HEAD_STR-REF_OBJ_ID sy-vline 
WA_QAMS_PD_HEAD_STR-REF_OBJ_NAME sy-vline 
WA_QAMS_PD_HEAD_STR-CONTACT_NAME sy-vline 
WA_QAMS_PD_HEAD_STR-CONTACT_ADR sy-vline 
WA_QAMS_PD_HEAD_STR-CONTACT_TEL sy-vline 
WA_QAMS_PD_HEAD_STR-CONTACT_FAX sy-vline 
WA_QAMS_PD_HEAD_STR-CONTACT_EMAIL sy-vline 
WA_QAMS_PD_HEAD_STR-ATT_NO sy-vline      INTO ld_text SEPARATED BY SPACE.

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