ABAP Select data from SAP table TST01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TST01 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 TST01. 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 TST01 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_TST01 TYPE STANDARD TABLE OF TST01,
      WA_TST01 TYPE TST01,
      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: <TST01> TYPE TST01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TST01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TST01
  INTO TABLE IT_TST01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TST01
*  INTO TABLE @DATA(IT_TST012).
*--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_TST01 INDEX 1 INTO DATA(WA_TST012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TST01 ASSIGNING <TST01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TST01>-DCLIENT = 1.
<TST01>-DNAME = 1.
<TST01>-DPART = 1.
<TST01>-DTYPE = 1.
<TST01>-DPQ = 1.

ENDLOOP.

LOOP AT IT_TST01 INTO WA_TST01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TST01-DLANG, sy-vline,
  WA_TST01-DCPUTYPE, sy-vline,
  WA_TST01-DDELTIME, sy-vline,
  WA_TST01-DCACPERM, sy-vline,
  WA_TST01-DSTATE, sy-vline,
  WA_TST01-DCRETIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TST01 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_TST01 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_TST01 INTO WA_TST01.


*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 DLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TST01-DLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TST01-DLANG.
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_TST01_STR, 
DCLIENT TYPE STRING,
DNAME TYPE STRING,
DPART TYPE STRING,
DTYPE TYPE STRING,
DPQ TYPE STRING,
DLANG TYPE STRING,
DCPUTYPE TYPE STRING,
DDELTIME TYPE STRING,
DCACPERM TYPE STRING,
DSTATE TYPE STRING,
DCRETIME TYPE STRING,
DMODTOOL TYPE STRING,
DCREATER TYPE STRING,
DCREREL TYPE STRING,
DREARULE TYPE STRING,
DREARLLG TYPE STRING,
DDELRULE TYPE STRING,
DDELRLLG TYPE STRING,
DAPPRULE TYPE STRING,
DAPPRLLG TYPE STRING,
DSTOTYP TYPE STRING,
DLOCAT TYPE STRING,
DFIRROW TYPE STRING,
DFIRBYTE TYPE STRING,
DROWS TYPE STRING,
DSIZE TYPE STRING,
DNOPARTS TYPE STRING,
DRECTYP TYPE STRING,
DCHARCOD TYPE STRING,
DLINELEN TYPE STRING,
DPAGELEN TYPE STRING,
DMODTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TST01_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_TST01_STR-DCLIENT sy-vline 
WA_TST01_STR-DNAME sy-vline 
WA_TST01_STR-DPART sy-vline 
WA_TST01_STR-DTYPE sy-vline 
WA_TST01_STR-DPQ sy-vline 
WA_TST01_STR-DLANG sy-vline 
WA_TST01_STR-DCPUTYPE sy-vline 
WA_TST01_STR-DDELTIME sy-vline 
WA_TST01_STR-DCACPERM sy-vline 
WA_TST01_STR-DSTATE sy-vline 
WA_TST01_STR-DCRETIME sy-vline 
WA_TST01_STR-DMODTOOL sy-vline 
WA_TST01_STR-DCREATER sy-vline 
WA_TST01_STR-DCREREL sy-vline 
WA_TST01_STR-DREARULE sy-vline 
WA_TST01_STR-DREARLLG sy-vline 
WA_TST01_STR-DDELRULE sy-vline 
WA_TST01_STR-DDELRLLG sy-vline 
WA_TST01_STR-DAPPRULE sy-vline 
WA_TST01_STR-DAPPRLLG sy-vline 
WA_TST01_STR-DSTOTYP sy-vline 
WA_TST01_STR-DLOCAT sy-vline 
WA_TST01_STR-DFIRROW sy-vline 
WA_TST01_STR-DFIRBYTE sy-vline 
WA_TST01_STR-DROWS sy-vline 
WA_TST01_STR-DSIZE sy-vline 
WA_TST01_STR-DNOPARTS sy-vline 
WA_TST01_STR-DRECTYP sy-vline 
WA_TST01_STR-DCHARCOD sy-vline 
WA_TST01_STR-DLINELEN sy-vline 
WA_TST01_STR-DPAGELEN sy-vline 
WA_TST01_STR-DMODTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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