ABAP Select data from SAP table TABLES_STR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TABLES_STR
*  INTO TABLE @DATA(IT_TABLES_STR2).
*--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_TABLES_STR INDEX 1 INTO DATA(WA_TABLES_STR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TABLES_STR>-CLUST_NAME = 1.
<TABLES_STR>-PCT_FREE = 1.
<TABLES_STR>-PCT_USED = 1.
<TABLES_STR>-INI_TRANS = 1.
<TABLES_STR>-MAX_TRANS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TABLES_STR-FREELISTS, sy-vline,
  WA_TABLES_STR-FREE_GROUP, sy-vline,
  WA_TABLES_STR-BACKED_UP, sy-vline,
  WA_TABLES_STR-NUM_ROWS, sy-vline,
  WA_TABLES_STR-BLOCKS, sy-vline,
  WA_TABLES_STR-EMPTY_BLKS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TABLES_STR 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_TABLES_STR 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_TABLES_STR INTO WA_TABLES_STR.


*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_TABLES_STR_STR, 
CLUST_NAME TYPE STRING,
PCT_FREE TYPE STRING,
PCT_USED TYPE STRING,
INI_TRANS TYPE STRING,
MAX_TRANS TYPE STRING,
FREELISTS TYPE STRING,
FREE_GROUP TYPE STRING,
BACKED_UP TYPE STRING,
NUM_ROWS TYPE STRING,
BLOCKS TYPE STRING,
EMPTY_BLKS TYPE STRING,
AVG_SPACE TYPE STRING,
CHAIN_CNT TYPE STRING,
AVG_ROW_LN TYPE STRING,
DEGREE TYPE STRING,
INSTANCES TYPE STRING,
CACHE TYPE STRING,
TABLE_LOCK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TABLES_STR_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_TABLES_STR_STR-CLUST_NAME sy-vline 
WA_TABLES_STR_STR-PCT_FREE sy-vline 
WA_TABLES_STR_STR-PCT_USED sy-vline 
WA_TABLES_STR_STR-INI_TRANS sy-vline 
WA_TABLES_STR_STR-MAX_TRANS sy-vline 
WA_TABLES_STR_STR-FREELISTS sy-vline 
WA_TABLES_STR_STR-FREE_GROUP sy-vline 
WA_TABLES_STR_STR-BACKED_UP sy-vline 
WA_TABLES_STR_STR-NUM_ROWS sy-vline 
WA_TABLES_STR_STR-BLOCKS sy-vline 
WA_TABLES_STR_STR-EMPTY_BLKS sy-vline 
WA_TABLES_STR_STR-AVG_SPACE sy-vline 
WA_TABLES_STR_STR-CHAIN_CNT sy-vline 
WA_TABLES_STR_STR-AVG_ROW_LN sy-vline 
WA_TABLES_STR_STR-DEGREE sy-vline 
WA_TABLES_STR_STR-INSTANCES sy-vline 
WA_TABLES_STR_STR-CACHE sy-vline 
WA_TABLES_STR_STR-TABLE_LOCK sy-vline      INTO ld_text SEPARATED BY SPACE.

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