ABAP Select data from SAP table TCACS_REG1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TCACS_REG1 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 TCACS_REG1. 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 TCACS_REG1 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_TCACS_REG1 TYPE STANDARD TABLE OF TCACS_REG1,
      WA_TCACS_REG1 TYPE TCACS_REG1,
      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: <TCACS_REG1> TYPE TCACS_REG1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TCACS_REG1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TCACS_REG1
  INTO TABLE IT_TCACS_REG1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TCACS_REG1
*  INTO TABLE @DATA(IT_TCACS_REG12).
*--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_TCACS_REG1 INDEX 1 INTO DATA(WA_TCACS_REG12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TCACS_REG1 ASSIGNING <TCACS_REG1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TCACS_REG1>-MODOBJ = 1.
<TCACS_REG1>-MULT = 1.
<TCACS_REG1>-LIKEOBJ = 1.
<TCACS_REG1>-GLEVEL = 1.
<TCACS_REG1>-KEXT = 1.

ENDLOOP.

LOOP AT IT_TCACS_REG1 INTO WA_TCACS_REG1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TCACS_REG1-DEXT, sy-vline,
  WA_TCACS_REG1-COLL, sy-vline,
  WA_TCACS_REG1-STAT, sy-vline,
  WA_TCACS_REG1-MAXKN, sy-vline,
  WA_TCACS_REG1-MAXKL, sy-vline,
  WA_TCACS_REG1-MAXDN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TCACS_REG1 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_TCACS_REG1 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_TCACS_REG1 INTO WA_TCACS_REG1.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_TCACS_REG1_STR, 
MODOBJ TYPE STRING,
MULT TYPE STRING,
LIKEOBJ TYPE STRING,
GLEVEL TYPE STRING,
KEXT TYPE STRING,
DEXT TYPE STRING,
COLL TYPE STRING,
STAT TYPE STRING,
MAXKN TYPE STRING,
MAXKL TYPE STRING,
MAXDN TYPE STRING,
MAXDL TYPE STRING,
TABCLASS TYPE STRING,
SQLTAB TYPE STRING,
CROSSAPPL TYPE STRING,
INSPOSK TYPE STRING,
INSPOSD TYPE STRING,
WITHTEXTTAB TYPE STRING,
WITHMAINTVIEW TYPE STRING,
WITHTABTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TCACS_REG1_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_TCACS_REG1_STR-MODOBJ sy-vline 
WA_TCACS_REG1_STR-MULT sy-vline 
WA_TCACS_REG1_STR-LIKEOBJ sy-vline 
WA_TCACS_REG1_STR-GLEVEL sy-vline 
WA_TCACS_REG1_STR-KEXT sy-vline 
WA_TCACS_REG1_STR-DEXT sy-vline 
WA_TCACS_REG1_STR-COLL sy-vline 
WA_TCACS_REG1_STR-STAT sy-vline 
WA_TCACS_REG1_STR-MAXKN sy-vline 
WA_TCACS_REG1_STR-MAXKL sy-vline 
WA_TCACS_REG1_STR-MAXDN sy-vline 
WA_TCACS_REG1_STR-MAXDL sy-vline 
WA_TCACS_REG1_STR-TABCLASS sy-vline 
WA_TCACS_REG1_STR-SQLTAB sy-vline 
WA_TCACS_REG1_STR-CROSSAPPL sy-vline 
WA_TCACS_REG1_STR-INSPOSK sy-vline 
WA_TCACS_REG1_STR-INSPOSD sy-vline 
WA_TCACS_REG1_STR-WITHTEXTTAB sy-vline 
WA_TCACS_REG1_STR-WITHMAINTVIEW sy-vline 
WA_TCACS_REG1_STR-WITHTABTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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