ABAP Select data from SAP table DB6CATTAB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB6CATTAB 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 DB6CATTAB. 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 DB6CATTAB 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_DB6CATTAB TYPE STANDARD TABLE OF DB6CATTAB,
      WA_DB6CATTAB TYPE DB6CATTAB,
      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: <DB6CATTAB> TYPE DB6CATTAB.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB6CATTAB.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB6CATTAB
  INTO TABLE IT_DB6CATTAB.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB6CATTAB
*  INTO TABLE @DATA(IT_DB6CATTAB2).
*--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_DB6CATTAB INDEX 1 INTO DATA(WA_DB6CATTAB2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB6CATTAB ASSIGNING <DB6CATTAB>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB6CATTAB>-TABSCHEMA = 1.
<DB6CATTAB>-TABNAME = 1.
<DB6CATTAB>-DEFINER = 1.
<DB6CATTAB>-TYPE = 1.
<DB6CATTAB>-STATUS = 1.

ENDLOOP.

LOOP AT IT_DB6CATTAB INTO WA_DB6CATTAB.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB6CATTAB-BASE_TABSCHEMA, sy-vline,
  WA_DB6CATTAB-BASE_TABNAME, sy-vline,
  WA_DB6CATTAB-ROWTYPESCHEMA, sy-vline,
  WA_DB6CATTAB-ROWTYPENAME, sy-vline,
  WA_DB6CATTAB-CREATE_TIME, sy-vline,
  WA_DB6CATTAB-STATS_TIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB6CATTAB 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_DB6CATTAB 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_DB6CATTAB INTO WA_DB6CATTAB.


*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_DB6CATTAB_STR, 
TABSCHEMA TYPE STRING,
TABNAME TYPE STRING,
DEFINER TYPE STRING,
TYPE TYPE STRING,
STATUS TYPE STRING,
BASE_TABSCHEMA TYPE STRING,
BASE_TABNAME TYPE STRING,
ROWTYPESCHEMA TYPE STRING,
ROWTYPENAME TYPE STRING,
CREATE_TIME TYPE STRING,
STATS_TIME TYPE STRING,
COLCOUNT TYPE STRING,
TABLEID TYPE STRING,
TBSPACEID TYPE STRING,
CARD TYPE STRING,
NPAGES TYPE STRING,
FPAGES TYPE STRING,
OVERFLOW TYPE STRING,
TBSPACE TYPE STRING,
INDEX_TBSPACE TYPE STRING,
LONG_TBSPACE TYPE STRING,
PARENTS TYPE STRING,
CHILDREN TYPE STRING,
SELFREFS TYPE STRING,
KEYCOLUMNS TYPE STRING,
KEYINDEXID TYPE STRING,
KEYUNIQUE TYPE STRING,
CHECKCOUNT TYPE STRING,
DATACAPTURE TYPE STRING,
CONST_CHECKED TYPE STRING,
PMAP_ID TYPE STRING,
PARTITION_MODE TYPE STRING,
LOG_ATTRIBUTE TYPE STRING,
PCTFREE TYPE STRING,
APPEND_MODE TYPE STRING,
REFRESH TYPE STRING,
REFRESH_TIME TYPE STRING,
LOCKSIZE TYPE STRING,
VOLATILE TYPE STRING,
REMARKS TYPE STRING,
ROW_FORMAT TYPE STRING,
PROPERTY TYPE STRING,
STATISTICS_PROFILE TYPE STRING,
COMPRESSION TYPE STRING,
ACCESS_MODE TYPE STRING,
CLUSTERED TYPE STRING,
ACTIVE_BLOCKS TYPE STRING,
DROPRULE TYPE STRING,
MAXFREESPACESEARCH TYPE STRING,
AVGCOMPRESSEDROWSIZE TYPE STRING,
AVGROWCOMPRESSIONRATIO TYPE STRING,
AVGROWSIZE TYPE STRING,
PCTROWSCOMPRESSED TYPE STRING,
PCTPAGESSAVED TYPE STRING,
SNAPSHOT_TIMESTAMP TYPE STRING,
ROWCOMPMODE TYPE STRING,
TABLEORG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB6CATTAB_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_DB6CATTAB_STR-TABSCHEMA sy-vline 
WA_DB6CATTAB_STR-TABNAME sy-vline 
WA_DB6CATTAB_STR-DEFINER sy-vline 
WA_DB6CATTAB_STR-TYPE sy-vline 
WA_DB6CATTAB_STR-STATUS sy-vline 
WA_DB6CATTAB_STR-BASE_TABSCHEMA sy-vline 
WA_DB6CATTAB_STR-BASE_TABNAME sy-vline 
WA_DB6CATTAB_STR-ROWTYPESCHEMA sy-vline 
WA_DB6CATTAB_STR-ROWTYPENAME sy-vline 
WA_DB6CATTAB_STR-CREATE_TIME sy-vline 
WA_DB6CATTAB_STR-STATS_TIME sy-vline 
WA_DB6CATTAB_STR-COLCOUNT sy-vline 
WA_DB6CATTAB_STR-TABLEID sy-vline 
WA_DB6CATTAB_STR-TBSPACEID sy-vline 
WA_DB6CATTAB_STR-CARD sy-vline 
WA_DB6CATTAB_STR-NPAGES sy-vline 
WA_DB6CATTAB_STR-FPAGES sy-vline 
WA_DB6CATTAB_STR-OVERFLOW sy-vline 
WA_DB6CATTAB_STR-TBSPACE sy-vline 
WA_DB6CATTAB_STR-INDEX_TBSPACE sy-vline 
WA_DB6CATTAB_STR-LONG_TBSPACE sy-vline 
WA_DB6CATTAB_STR-PARENTS sy-vline 
WA_DB6CATTAB_STR-CHILDREN sy-vline 
WA_DB6CATTAB_STR-SELFREFS sy-vline 
WA_DB6CATTAB_STR-KEYCOLUMNS sy-vline 
WA_DB6CATTAB_STR-KEYINDEXID sy-vline 
WA_DB6CATTAB_STR-KEYUNIQUE sy-vline 
WA_DB6CATTAB_STR-CHECKCOUNT sy-vline 
WA_DB6CATTAB_STR-DATACAPTURE sy-vline 
WA_DB6CATTAB_STR-CONST_CHECKED sy-vline 
WA_DB6CATTAB_STR-PMAP_ID sy-vline 
WA_DB6CATTAB_STR-PARTITION_MODE sy-vline 
WA_DB6CATTAB_STR-LOG_ATTRIBUTE sy-vline 
WA_DB6CATTAB_STR-PCTFREE sy-vline 
WA_DB6CATTAB_STR-APPEND_MODE sy-vline 
WA_DB6CATTAB_STR-REFRESH sy-vline 
WA_DB6CATTAB_STR-REFRESH_TIME sy-vline 
WA_DB6CATTAB_STR-LOCKSIZE sy-vline 
WA_DB6CATTAB_STR-VOLATILE sy-vline 
WA_DB6CATTAB_STR-REMARKS sy-vline 
WA_DB6CATTAB_STR-ROW_FORMAT sy-vline 
WA_DB6CATTAB_STR-PROPERTY sy-vline 
WA_DB6CATTAB_STR-STATISTICS_PROFILE sy-vline 
WA_DB6CATTAB_STR-COMPRESSION sy-vline 
WA_DB6CATTAB_STR-ACCESS_MODE sy-vline 
WA_DB6CATTAB_STR-CLUSTERED sy-vline 
WA_DB6CATTAB_STR-ACTIVE_BLOCKS sy-vline 
WA_DB6CATTAB_STR-DROPRULE sy-vline 
WA_DB6CATTAB_STR-MAXFREESPACESEARCH sy-vline 
WA_DB6CATTAB_STR-AVGCOMPRESSEDROWSIZE sy-vline 
WA_DB6CATTAB_STR-AVGROWCOMPRESSIONRATIO sy-vline 
WA_DB6CATTAB_STR-AVGROWSIZE sy-vline 
WA_DB6CATTAB_STR-PCTROWSCOMPRESSED sy-vline 
WA_DB6CATTAB_STR-PCTPAGESSAVED sy-vline 
WA_DB6CATTAB_STR-SNAPSHOT_TIMESTAMP sy-vline 
WA_DB6CATTAB_STR-ROWCOMPMODE sy-vline 
WA_DB6CATTAB_STR-TABLEORG sy-vline      INTO ld_text SEPARATED BY SPACE.

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