ABAP Select data from SAP table AGRDISTC_LGSYS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AGRDISTC_LGSYS
*  INTO TABLE @DATA(IT_AGRDISTC_LGSYS2).
*--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_AGRDISTC_LGSYS INDEX 1 INTO DATA(WA_AGRDISTC_LGSYS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AGRDISTC_LGSYS>-MANDT = 1.
<AGRDISTC_LGSYS>-RCVSYSTEM = 1.
<AGRDISTC_LGSYS>-SYSNAME = 1.
<AGRDISTC_LGSYS>-SYSCLIENT = 1.
<AGRDISTC_LGSYS>-CCCATEGORY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AGRDISTC_LGSYS-CCCORACTIV, sy-vline,
  WA_AGRDISTC_LGSYS-BASIS_PATCH, sy-vline,
  WA_AGRDISTC_LGSYS-ACTIVE, sy-vline,
  WA_AGRDISTC_LGSYS-RESPONSIBLE, sy-vline,
  WA_AGRDISTC_LGSYS-DESCRIPTION, sy-vline,
  WA_AGRDISTC_LGSYS-RFCDEST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AGRDISTC_LGSYS 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_AGRDISTC_LGSYS 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_AGRDISTC_LGSYS INTO WA_AGRDISTC_LGSYS.


*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 RCVSYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_AGRDISTC_LGSYS-RCVSYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AGRDISTC_LGSYS-RCVSYSTEM.
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_AGRDISTC_LGSYS_STR, 
MANDT TYPE STRING,
RCVSYSTEM TYPE STRING,
SYSNAME TYPE STRING,
SYSCLIENT TYPE STRING,
CCCATEGORY TYPE STRING,
CCCORACTIV TYPE STRING,
BASIS_PATCH TYPE STRING,
ACTIVE TYPE STRING,
RESPONSIBLE TYPE STRING,
DESCRIPTION TYPE STRING,
RFCDEST TYPE STRING,
SU2XCLIENT TYPE STRING,
SYSTEMATTR1 TYPE STRING,
SYSTEMATTR2 TYPE STRING,
SYSTEMATTR3 TYPE STRING,
SYSTEMATTR4 TYPE STRING,
SYSTEMATTR5 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AGRDISTC_LGSYS_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_AGRDISTC_LGSYS_STR-MANDT sy-vline 
WA_AGRDISTC_LGSYS_STR-RCVSYSTEM sy-vline 
WA_AGRDISTC_LGSYS_STR-SYSNAME sy-vline 
WA_AGRDISTC_LGSYS_STR-SYSCLIENT sy-vline 
WA_AGRDISTC_LGSYS_STR-CCCATEGORY sy-vline 
WA_AGRDISTC_LGSYS_STR-CCCORACTIV sy-vline 
WA_AGRDISTC_LGSYS_STR-BASIS_PATCH sy-vline 
WA_AGRDISTC_LGSYS_STR-ACTIVE sy-vline 
WA_AGRDISTC_LGSYS_STR-RESPONSIBLE sy-vline 
WA_AGRDISTC_LGSYS_STR-DESCRIPTION sy-vline 
WA_AGRDISTC_LGSYS_STR-RFCDEST sy-vline 
WA_AGRDISTC_LGSYS_STR-SU2XCLIENT sy-vline 
WA_AGRDISTC_LGSYS_STR-SYSTEMATTR1 sy-vline 
WA_AGRDISTC_LGSYS_STR-SYSTEMATTR2 sy-vline 
WA_AGRDISTC_LGSYS_STR-SYSTEMATTR3 sy-vline 
WA_AGRDISTC_LGSYS_STR-SYSTEMATTR4 sy-vline 
WA_AGRDISTC_LGSYS_STR-SYSTEMATTR5 sy-vline      INTO ld_text SEPARATED BY SPACE.

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