ABAP Select data from SAP table PPMGAG_T_APPMSG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PPMGAG_T_APPMSG
*  INTO TABLE @DATA(IT_PPMGAG_T_APPMSG2).
*--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_PPMGAG_T_APPMSG INDEX 1 INTO DATA(WA_PPMGAG_T_APPMSG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PPMGAG_T_APPMSG>-MANDT = 1.
<PPMGAG_T_APPMSG>-PREPAYMENTPOSTINGMESSAGEUUID = 1.
<PPMGAG_T_APPMSG>-PREPAYMENTAPPROVALUUID = 1.
<PPMGAG_T_APPMSG>-PREPAYMENTAGREEMENT = 1.
<PPMGAG_T_APPMSG>-SYSTEMMESSAGETYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PPMGAG_T_APPMSG-SYSTEMMESSAGEIDENTIFICATION, sy-vline,
  WA_PPMGAG_T_APPMSG-SYSTEMMESSAGENUMBER, sy-vline,
  WA_PPMGAG_T_APPMSG-SYSTEMMESSAGETEXT, sy-vline,
  WA_PPMGAG_T_APPMSG-SYSTEMMESSAGEVARIABLE1, sy-vline,
  WA_PPMGAG_T_APPMSG-SYSTEMMESSAGEVARIABLE2, sy-vline,
  WA_PPMGAG_T_APPMSG-SYSTEMMESSAGEVARIABLE3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PPMGAG_T_APPMSG 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_PPMGAG_T_APPMSG 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_PPMGAG_T_APPMSG INTO WA_PPMGAG_T_APPMSG.


*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_PPMGAG_T_APPMSG_STR, 
MANDT TYPE STRING,
PREPAYMENTPOSTINGMESSAGEUUID TYPE STRING,
PREPAYMENTAPPROVALUUID TYPE STRING,
PREPAYMENTAGREEMENT TYPE STRING,
SYSTEMMESSAGETYPE TYPE STRING,
SYSTEMMESSAGEIDENTIFICATION TYPE STRING,
SYSTEMMESSAGENUMBER TYPE STRING,
SYSTEMMESSAGETEXT TYPE STRING,
SYSTEMMESSAGEVARIABLE1 TYPE STRING,
SYSTEMMESSAGEVARIABLE2 TYPE STRING,
SYSTEMMESSAGEVARIABLE3 TYPE STRING,
SYSTEMMESSAGEVARIABLE4 TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATETIME TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
PPMGAC_APPMSG_DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PPMGAG_T_APPMSG_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_PPMGAG_T_APPMSG_STR-MANDT sy-vline 
WA_PPMGAG_T_APPMSG_STR-PREPAYMENTPOSTINGMESSAGEUUID sy-vline 
WA_PPMGAG_T_APPMSG_STR-PREPAYMENTAPPROVALUUID sy-vline 
WA_PPMGAG_T_APPMSG_STR-PREPAYMENTAGREEMENT sy-vline 
WA_PPMGAG_T_APPMSG_STR-SYSTEMMESSAGETYPE sy-vline 
WA_PPMGAG_T_APPMSG_STR-SYSTEMMESSAGEIDENTIFICATION sy-vline 
WA_PPMGAG_T_APPMSG_STR-SYSTEMMESSAGENUMBER sy-vline 
WA_PPMGAG_T_APPMSG_STR-SYSTEMMESSAGETEXT sy-vline 
WA_PPMGAG_T_APPMSG_STR-SYSTEMMESSAGEVARIABLE1 sy-vline 
WA_PPMGAG_T_APPMSG_STR-SYSTEMMESSAGEVARIABLE2 sy-vline 
WA_PPMGAG_T_APPMSG_STR-SYSTEMMESSAGEVARIABLE3 sy-vline 
WA_PPMGAG_T_APPMSG_STR-SYSTEMMESSAGEVARIABLE4 sy-vline 
WA_PPMGAG_T_APPMSG_STR-CREATEDBYUSER sy-vline 
WA_PPMGAG_T_APPMSG_STR-CREATIONDATETIME sy-vline 
WA_PPMGAG_T_APPMSG_STR-LASTCHANGEDBYUSER sy-vline 
WA_PPMGAG_T_APPMSG_STR-LASTCHANGEDATETIME sy-vline 
WA_PPMGAG_T_APPMSG_STR-PPMGAC_APPMSG_DUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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