ABAP Select data from SAP table LTRQ_RQSTI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LTRQ_RQSTI
*  INTO TABLE @DATA(IT_LTRQ_RQSTI2).
*--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_LTRQ_RQSTI INDEX 1 INTO DATA(WA_LTRQ_RQSTI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LTRQ_RQSTI>-RIRFL = 1.
<LTRQ_RQSTI>-RIGRP = 1.
<LTRQ_RQSTI>-RQITY = 1.
<LTRQ_RQSTI>-RQACT = 1.
<LTRQ_RQSTI>-RISTS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LTRQ_RQSTI-RZONESRC, sy-vline,
  WA_LTRQ_RQSTI-BINCXSRC, sy-vline,
  WA_LTRQ_RQSTI-BINCYSRC, sy-vline,
  WA_LTRQ_RQSTI-BINCZSRC, sy-vline,
  WA_LTRQ_RQSTI-RNODESRC, sy-vline,
  WA_LTRQ_RQSTI-RZONEDST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LTRQ_RQSTI 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_LTRQ_RQSTI 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_LTRQ_RQSTI INTO WA_LTRQ_RQSTI.


*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 HUNUMSRC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LTRQ_RQSTI-HUNUMSRC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTRQ_RQSTI-HUNUMSRC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field HUNUMDST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LTRQ_RQSTI-HUNUMDST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTRQ_RQSTI-HUNUMDST.
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_LTRQ_RQSTI_STR, 
RIRFL TYPE STRING,
RIGRP TYPE STRING,
RQITY TYPE STRING,
RQACT TYPE STRING,
RISTS TYPE STRING,
RZONESRC TYPE STRING,
BINCXSRC TYPE STRING,
BINCYSRC TYPE STRING,
BINCZSRC TYPE STRING,
RNODESRC TYPE STRING,
RZONEDST TYPE STRING,
BINCXDST TYPE STRING,
BINCYDST TYPE STRING,
BINCZDST TYPE STRING,
RNODEDST TYPE STRING,
HUNUMSRC TYPE STRING,
HUTYPSRC TYPE STRING,
HUNUMDST TYPE STRING,
HUTYPDST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LTRQ_RQSTI_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_LTRQ_RQSTI_STR-RIRFL sy-vline 
WA_LTRQ_RQSTI_STR-RIGRP sy-vline 
WA_LTRQ_RQSTI_STR-RQITY sy-vline 
WA_LTRQ_RQSTI_STR-RQACT sy-vline 
WA_LTRQ_RQSTI_STR-RISTS sy-vline 
WA_LTRQ_RQSTI_STR-RZONESRC sy-vline 
WA_LTRQ_RQSTI_STR-BINCXSRC sy-vline 
WA_LTRQ_RQSTI_STR-BINCYSRC sy-vline 
WA_LTRQ_RQSTI_STR-BINCZSRC sy-vline 
WA_LTRQ_RQSTI_STR-RNODESRC sy-vline 
WA_LTRQ_RQSTI_STR-RZONEDST sy-vline 
WA_LTRQ_RQSTI_STR-BINCXDST sy-vline 
WA_LTRQ_RQSTI_STR-BINCYDST sy-vline 
WA_LTRQ_RQSTI_STR-BINCZDST sy-vline 
WA_LTRQ_RQSTI_STR-RNODEDST sy-vline 
WA_LTRQ_RQSTI_STR-HUNUMSRC sy-vline 
WA_LTRQ_RQSTI_STR-HUTYPSRC sy-vline 
WA_LTRQ_RQSTI_STR-HUNUMDST sy-vline 
WA_LTRQ_RQSTI_STR-HUTYPDST sy-vline      INTO ld_text SEPARATED BY SPACE.

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