ABAP Select data from SAP table /LTB/TR_S_PARAM_TECH_DATA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /LTB/TR_S_PARAM_TECH_DATA 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 /LTB/TR_S_PARAM_TECH_DATA. 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 /LTB/TR_S_PARAM_TECH_DATA 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_/LTB/TR_S_PARAM_TECH_DATA TYPE STANDARD TABLE OF /LTB/TR_S_PARAM_TECH_DATA,
      WA_/LTB/TR_S_PARAM_TECH_DATA TYPE /LTB/TR_S_PARAM_TECH_DATA,
      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: </LTB/TR_S_PARAM_TECH_DATA> TYPE /LTB/TR_S_PARAM_TECH_DATA.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /LTB/TR_S_PARAM_TECH_DATA
  INTO TABLE IT_/LTB/TR_S_PARAM_TECH_DATA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /LTB/TR_S_PARAM_TECH_DATA
*  INTO TABLE @DATA(IT_/LTB/TR_S_PARAM_TECH_DATA2).
*--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_/LTB/TR_S_PARAM_TECH_DATA INDEX 1 INTO DATA(WA_/LTB/TR_S_PARAM_TECH_DATA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/LTB/TR_S_PARAM_TECH_DATA ASSIGNING </LTB/TR_S_PARAM_TECH_DATA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</LTB/TR_S_PARAM_TECH_DATA>-TABNAME = 1.
</LTB/TR_S_PARAM_TECH_DATA>-FIELDNAME = 1.
</LTB/TR_S_PARAM_TECH_DATA>-POSITION = 1.
</LTB/TR_S_PARAM_TECH_DATA>-DATATYPE = 1.
</LTB/TR_S_PARAM_TECH_DATA>-INTTYPE = 1.

ENDLOOP.

LOOP AT IT_/LTB/TR_S_PARAM_TECH_DATA INTO WA_/LTB/TR_S_PARAM_TECH_DATA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/LTB/TR_S_PARAM_TECH_DATA-LENG, sy-vline,
  WA_/LTB/TR_S_PARAM_TECH_DATA-INTLEN, sy-vline,
  WA_/LTB/TR_S_PARAM_TECH_DATA-DECIMALS, sy-vline,
  WA_/LTB/TR_S_PARAM_TECH_DATA-LOWERCASE, sy-vline,
  WA_/LTB/TR_S_PARAM_TECH_DATA-CONVEXIT, sy-vline,
  WA_/LTB/TR_S_PARAM_TECH_DATA-ROLLNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/LTB/TR_S_PARAM_TECH_DATA 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_/LTB/TR_S_PARAM_TECH_DATA 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_/LTB/TR_S_PARAM_TECH_DATA INTO WA_/LTB/TR_S_PARAM_TECH_DATA.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_/LTB/TR_S_PARAM_TECH_DATA-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/LTB/TR_S_PARAM_TECH_DATA-DATATYPE.
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_/LTB/TR_S_PARAM_TECH_DATA_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
POSITION TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
LENG TYPE STRING,
INTLEN TYPE STRING,
DECIMALS TYPE STRING,
LOWERCASE TYPE STRING,
CONVEXIT TYPE STRING,
ROLLNAME TYPE STRING,
CHECK_DOM TYPE STRING,
CHECK_TAB TYPE STRING,
CHECK_FIELD TYPE STRING,
SHLPNAME TYPE STRING,
CAPITALIZE TYPE STRING,
CHECK_VALUE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/LTB/TR_S_PARAM_TECH_DATA_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_/LTB/TR_S_PARAM_TECH_DATA_STR-TABNAME sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-FIELDNAME sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-POSITION sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-DATATYPE sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-INTTYPE sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-LENG sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-INTLEN sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-DECIMALS sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-LOWERCASE sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-CONVEXIT sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-ROLLNAME sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-CHECK_DOM sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-CHECK_TAB sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-CHECK_FIELD sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-SHLPNAME sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-CAPITALIZE sy-vline 
WA_/LTB/TR_S_PARAM_TECH_DATA_STR-CHECK_VALUE sy-vline      INTO ld_text SEPARATED BY SPACE.

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