ABAP Select data from SAP table DSYS_LOHEAD_E_CI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DSYS_LOHEAD_E_CI
*  INTO TABLE @DATA(IT_DSYS_LOHEAD_E_CI2).
*--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_DSYS_LOHEAD_E_CI INDEX 1 INTO DATA(WA_DSYS_LOHEAD_E_CI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DSYS_LOHEAD_E_CI>-LOIO_ID = 1.
<DSYS_LOHEAD_E_CI>-LO_CLASS = 1.
<DSYS_LOHEAD_E_CI>-MASTER_LG = 1.
<DSYS_LOHEAD_E_CI>-CREA_USER = 1.
<DSYS_LOHEAD_E_CI>-CREA_TIME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DSYS_LOHEAD_E_CI-CHNG_USER, sy-vline,
  WA_DSYS_LOHEAD_E_CI-CHNG_TIME, sy-vline,
  WA_DSYS_LOHEAD_E_CI-PROP01, sy-vline,
  WA_DSYS_LOHEAD_E_CI-PROP02, sy-vline,
  WA_DSYS_LOHEAD_E_CI-PROP03, sy-vline,
  WA_DSYS_LOHEAD_E_CI-PROP04, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DSYS_LOHEAD_E_CI 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_DSYS_LOHEAD_E_CI 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_DSYS_LOHEAD_E_CI INTO WA_DSYS_LOHEAD_E_CI.


*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 ISOLA, internal->external for field MASTER_LG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DSYS_LOHEAD_E_CI-MASTER_LG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DSYS_LOHEAD_E_CI-MASTER_LG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTLC, internal->external for field CREA_TIME
CALL FUNCTION 'CONVERSION_EXIT_TSTLC_OUTPUT'
  EXPORTING
    input =                      WA_DSYS_LOHEAD_E_CI-CREA_TIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DSYS_LOHEAD_E_CI-CREA_TIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTLC, internal->external for field CHNG_TIME
CALL FUNCTION 'CONVERSION_EXIT_TSTLC_OUTPUT'
  EXPORTING
    input =                      WA_DSYS_LOHEAD_E_CI-CHNG_TIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DSYS_LOHEAD_E_CI-CHNG_TIME.
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_DSYS_LOHEAD_E_CI_STR, 
LOIO_ID TYPE STRING,
LO_CLASS TYPE STRING,
MASTER_LG TYPE STRING,
CREA_USER TYPE STRING,
CREA_TIME TYPE STRING,
CHNG_USER TYPE STRING,
CHNG_TIME TYPE STRING,
PROP01 TYPE STRING,
PROP02 TYPE STRING,
PROP03 TYPE STRING,
PROP04 TYPE STRING,
PROP05 TYPE STRING,
PROP06 TYPE STRING,
PROP07 TYPE STRING,
PROP08 TYPE STRING,
PROP09 TYPE STRING,
PROP10 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DSYS_LOHEAD_E_CI_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_DSYS_LOHEAD_E_CI_STR-LOIO_ID sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-LO_CLASS sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-MASTER_LG sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-CREA_USER sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-CREA_TIME sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-CHNG_USER sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-CHNG_TIME sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP01 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP02 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP03 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP04 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP05 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP06 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP07 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP08 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP09 sy-vline 
WA_DSYS_LOHEAD_E_CI_STR-PROP10 sy-vline      INTO ld_text SEPARATED BY SPACE.

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