ABAP Select data from SAP table LAGP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LAGP
*  INTO TABLE @DATA(IT_LAGP2).
*--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_LAGP INDEX 1 INTO DATA(WA_LAGP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LAGP>-MANDT = 1.
<LAGP>-LGNUM = 1.
<LAGP>-LGTYP = 1.
<LAGP>-LGPLA = 1.
<LAGP>-LGBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LAGP-LPTYP, sy-vline,
  WA_LAGP-PLAUF, sy-vline,
  WA_LAGP-SKZUA, sy-vline,
  WA_LAGP-SKZUE, sy-vline,
  WA_LAGP-SKZSA, sy-vline,
  WA_LAGP-SKZSE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LAGP 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_LAGP 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_LAGP INTO WA_LAGP.


*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 CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LAGP-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LAGP-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field IVNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LAGP-IVNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LAGP-IVNUM.
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_LAGP_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
LGPLA TYPE STRING,
LGBER TYPE STRING,
LPTYP TYPE STRING,
PLAUF TYPE STRING,
SKZUA TYPE STRING,
SKZUE TYPE STRING,
SKZSA TYPE STRING,
SKZSE TYPE STRING,
SKZSI TYPE STRING,
SPGRU TYPE STRING,
ANZQU TYPE STRING,
MAXQU TYPE STRING,
ANZLE TYPE STRING,
MAXLE TYPE STRING,
KZDYN TYPE STRING,
LGEWI TYPE STRING,
GEWEI TYPE STRING,
MGEWI TYPE STRING,
BDATU TYPE STRING,
BZEIT TYPE STRING,
BTANR TYPE STRING,
BTAPS TYPE STRING,
RDATU TYPE STRING,
RZEIT TYPE STRING,
KZINV TYPE STRING,
IDATU TYPE STRING,
IVNUM TYPE STRING,
IVPOS TYPE STRING,
IVIVO TYPE STRING,
KZLER TYPE STRING,
KZVOL TYPE STRING,
SORLP TYPE STRING,
BRAND TYPE STRING,
UNAME TYPE STRING,
LAEDT TYPE STRING,
LKAPV TYPE STRING,
RKAPV TYPE STRING,
KOBER TYPE STRING,
REIHF TYPE STRING,
VERIF TYPE STRING,
LZONE TYPE STRING,
XCORD TYPE STRING,
YCORD TYPE STRING,
ZCORD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LAGP_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_LAGP_STR-MANDT sy-vline 
WA_LAGP_STR-LGNUM sy-vline 
WA_LAGP_STR-LGTYP sy-vline 
WA_LAGP_STR-LGPLA sy-vline 
WA_LAGP_STR-LGBER sy-vline 
WA_LAGP_STR-LPTYP sy-vline 
WA_LAGP_STR-PLAUF sy-vline 
WA_LAGP_STR-SKZUA sy-vline 
WA_LAGP_STR-SKZUE sy-vline 
WA_LAGP_STR-SKZSA sy-vline 
WA_LAGP_STR-SKZSE sy-vline 
WA_LAGP_STR-SKZSI sy-vline 
WA_LAGP_STR-SPGRU sy-vline 
WA_LAGP_STR-ANZQU sy-vline 
WA_LAGP_STR-MAXQU sy-vline 
WA_LAGP_STR-ANZLE sy-vline 
WA_LAGP_STR-MAXLE sy-vline 
WA_LAGP_STR-KZDYN sy-vline 
WA_LAGP_STR-LGEWI sy-vline 
WA_LAGP_STR-GEWEI sy-vline 
WA_LAGP_STR-MGEWI sy-vline 
WA_LAGP_STR-BDATU sy-vline 
WA_LAGP_STR-BZEIT sy-vline 
WA_LAGP_STR-BTANR sy-vline 
WA_LAGP_STR-BTAPS sy-vline 
WA_LAGP_STR-RDATU sy-vline 
WA_LAGP_STR-RZEIT sy-vline 
WA_LAGP_STR-KZINV sy-vline 
WA_LAGP_STR-IDATU sy-vline 
WA_LAGP_STR-IVNUM sy-vline 
WA_LAGP_STR-IVPOS sy-vline 
WA_LAGP_STR-IVIVO sy-vline 
WA_LAGP_STR-KZLER sy-vline 
WA_LAGP_STR-KZVOL sy-vline 
WA_LAGP_STR-SORLP sy-vline 
WA_LAGP_STR-BRAND sy-vline 
WA_LAGP_STR-UNAME sy-vline 
WA_LAGP_STR-LAEDT sy-vline 
WA_LAGP_STR-LKAPV sy-vline 
WA_LAGP_STR-RKAPV sy-vline 
WA_LAGP_STR-KOBER sy-vline 
WA_LAGP_STR-REIHF sy-vline 
WA_LAGP_STR-VERIF sy-vline 
WA_LAGP_STR-LZONE sy-vline 
WA_LAGP_STR-XCORD sy-vline 
WA_LAGP_STR-YCORD sy-vline 
WA_LAGP_STR-ZCORD sy-vline      INTO ld_text SEPARATED BY SPACE.

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