ABAP Select data from SAP table LDHLP into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LDHLP
*  INTO TABLE @DATA(IT_LDHLP2).
*--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_LDHLP INDEX 1 INTO DATA(WA_LDHLP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LDHLP>-KZ_LIST_CALLED = 1.
<LDHLP>-KZ_LBOP_CALLED = 1.
<LDHLP>-KZ_PROD_READ = 1.
<LDHLP>-KZ_LBAL_READ = 1.
<LDHLP>-KZ_RATE_READ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LDHLP-KZ_LINE_READ, sy-vline,
  WA_LDHLP-KZ_OPER_READ, sy-vline,
  WA_LDHLP-KZ_OPER_LOCK, sy-vline,
  WA_LDHLP-KZ_TIME_CALC, sy-vline,
  WA_LDHLP-KZ_TPCT_CALC, sy-vline,
  WA_LDHLP-KZ_TKTT_READ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LDHLP 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_LDHLP 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_LDHLP INTO WA_LDHLP.


*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 LUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDHLP-LUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDHLP-LUNIT.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LDHLP-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDHLP-MATNR.
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_LDHLP_STR, 
KZ_LIST_CALLED TYPE STRING,
KZ_LBOP_CALLED TYPE STRING,
KZ_PROD_READ TYPE STRING,
KZ_LBAL_READ TYPE STRING,
KZ_RATE_READ TYPE STRING,
KZ_LINE_READ TYPE STRING,
KZ_OPER_READ TYPE STRING,
KZ_OPER_LOCK TYPE STRING,
KZ_TIME_CALC TYPE STRING,
KZ_TPCT_CALC TYPE STRING,
KZ_TKTT_READ TYPE STRING,
KZ_ATKT_READ TYPE STRING,
KZ_TLIN_READ TYPE STRING,
KZ_MDRATE_READ TYPE STRING,
KZ_MDRCHEK_READ TYPE STRING,
KZ_INITIAL_121 TYPE STRING,
KZ_INITIAL_314 TYPE STRING,
KZ_MULTI_USED_ROUT TYPE STRING,
STATUS_TEXT TYPE STRING,
NODEKEY TYPE STRING,
LD_HOURS TYPE STRING,
MMIXAVG TYPE STRING,
PLNTY_R TYPE STRING,
PLNTY_N TYPE STRING,
PLNTY_A TYPE STRING,
SEL_FVER TYPE STRING,
SEL_LBAL TYPE STRING,
SEL_LBVER TYPE STRING,
LRATE TYPE STRING,
LANTU TYPE STRING,
LUNIT TYPE STRING,
LTIUN TYPE STRING,
LUNIT_TC TYPE STRING,
LTIUN_TC TYPE STRING,
EX_UNIT TYPE STRING,
TKZTF TYPE STRING,
NO_LBAL TYPE STRING,
LBAL_MAX TYPE STRING,
NOT_ASS_OPER TYPE STRING,
WORKDAYS TYPE STRING,
PIXELSIZE TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
CHK_PRINT TYPE STRING,
LD_TIMES_GRID TYPE STRING,
LD_LINE_SEG TYPE STRING,
CHK_SUM TYPE STRING,
CHK_AEGR TYPE STRING,
CHK_AESI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LDHLP_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_LDHLP_STR-KZ_LIST_CALLED sy-vline 
WA_LDHLP_STR-KZ_LBOP_CALLED sy-vline 
WA_LDHLP_STR-KZ_PROD_READ sy-vline 
WA_LDHLP_STR-KZ_LBAL_READ sy-vline 
WA_LDHLP_STR-KZ_RATE_READ sy-vline 
WA_LDHLP_STR-KZ_LINE_READ sy-vline 
WA_LDHLP_STR-KZ_OPER_READ sy-vline 
WA_LDHLP_STR-KZ_OPER_LOCK sy-vline 
WA_LDHLP_STR-KZ_TIME_CALC sy-vline 
WA_LDHLP_STR-KZ_TPCT_CALC sy-vline 
WA_LDHLP_STR-KZ_TKTT_READ sy-vline 
WA_LDHLP_STR-KZ_ATKT_READ sy-vline 
WA_LDHLP_STR-KZ_TLIN_READ sy-vline 
WA_LDHLP_STR-KZ_MDRATE_READ sy-vline 
WA_LDHLP_STR-KZ_MDRCHEK_READ sy-vline 
WA_LDHLP_STR-KZ_INITIAL_121 sy-vline 
WA_LDHLP_STR-KZ_INITIAL_314 sy-vline 
WA_LDHLP_STR-KZ_MULTI_USED_ROUT sy-vline 
WA_LDHLP_STR-STATUS_TEXT sy-vline 
WA_LDHLP_STR-NODEKEY sy-vline 
WA_LDHLP_STR-LD_HOURS sy-vline 
WA_LDHLP_STR-MMIXAVG sy-vline 
WA_LDHLP_STR-PLNTY_R sy-vline 
WA_LDHLP_STR-PLNTY_N sy-vline 
WA_LDHLP_STR-PLNTY_A sy-vline 
WA_LDHLP_STR-SEL_FVER sy-vline 
WA_LDHLP_STR-SEL_LBAL sy-vline 
WA_LDHLP_STR-SEL_LBVER sy-vline 
WA_LDHLP_STR-LRATE sy-vline 
WA_LDHLP_STR-LANTU sy-vline 
WA_LDHLP_STR-LUNIT sy-vline 
WA_LDHLP_STR-LTIUN sy-vline 
WA_LDHLP_STR-LUNIT_TC sy-vline 
WA_LDHLP_STR-LTIUN_TC sy-vline 
WA_LDHLP_STR-EX_UNIT sy-vline 
WA_LDHLP_STR-TKZTF sy-vline 
WA_LDHLP_STR-NO_LBAL sy-vline 
WA_LDHLP_STR-LBAL_MAX sy-vline 
WA_LDHLP_STR-NOT_ASS_OPER sy-vline 
WA_LDHLP_STR-WORKDAYS sy-vline 
WA_LDHLP_STR-PIXELSIZE sy-vline 
WA_LDHLP_STR-MATNR sy-vline 
WA_LDHLP_STR-MAKTX sy-vline 
WA_LDHLP_STR-CHK_PRINT sy-vline 
WA_LDHLP_STR-LD_TIMES_GRID sy-vline 
WA_LDHLP_STR-LD_LINE_SEG sy-vline 
WA_LDHLP_STR-CHK_SUM sy-vline 
WA_LDHLP_STR-CHK_AEGR sy-vline 
WA_LDHLP_STR-CHK_AESI sy-vline      INTO ld_text SEPARATED BY SPACE.

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