ABAP Select data from SAP table SIQ_COLUMNS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SIQ_COLUMNS
*  INTO TABLE @DATA(IT_SIQ_COLUMNS2).
*--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_SIQ_COLUMNS INDEX 1 INTO DATA(WA_SIQ_COLUMNS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SIQ_COLUMNS>-COLUMNIDVALUE = 1.
<SIQ_COLUMNS>-OBJECTIDVALUE = 1.
<SIQ_COLUMNS>-COLUMNNAME = 1.
<SIQ_COLUMNS>-BASETYPE = 1.
<SIQ_COLUMNS>-WIDTH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SIQ_COLUMNS-SCALE, sy-vline,
  WA_SIQ_COLUMNS-COLUMN1, sy-vline,
  WA_SIQ_COLUMNS-COLUMN2, sy-vline,
  WA_SIQ_COLUMNS-TYPENAME, sy-vline,
  WA_SIQ_COLUMNS-NULLSCOLUMN, sy-vline,
  WA_SIQ_COLUMNS-UNIQUECOLUMN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SIQ_COLUMNS 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_SIQ_COLUMNS 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_SIQ_COLUMNS INTO WA_SIQ_COLUMNS.


*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_SIQ_COLUMNS_STR, 
COLUMNIDVALUE TYPE STRING,
OBJECTIDVALUE TYPE STRING,
COLUMNNAME TYPE STRING,
BASETYPE TYPE STRING,
WIDTH TYPE STRING,
SCALE TYPE STRING,
COLUMN1 TYPE STRING,
COLUMN2 TYPE STRING,
TYPENAME TYPE STRING,
NULLSCOLUMN TYPE STRING,
UNIQUECOLUMN TYPE STRING,
PKEY TYPE STRING,
COLUMNTYPE TYPE STRING,
DEFAULTCOLUMN TYPE STRING,
COMPRESSEDVALUE TYPE STRING,
LOBINDEX TYPE STRING,
REMARKS TYPE STRING,
DBSPACENAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SIQ_COLUMNS_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_SIQ_COLUMNS_STR-COLUMNIDVALUE sy-vline 
WA_SIQ_COLUMNS_STR-OBJECTIDVALUE sy-vline 
WA_SIQ_COLUMNS_STR-COLUMNNAME sy-vline 
WA_SIQ_COLUMNS_STR-BASETYPE sy-vline 
WA_SIQ_COLUMNS_STR-WIDTH sy-vline 
WA_SIQ_COLUMNS_STR-SCALE sy-vline 
WA_SIQ_COLUMNS_STR-COLUMN1 sy-vline 
WA_SIQ_COLUMNS_STR-COLUMN2 sy-vline 
WA_SIQ_COLUMNS_STR-TYPENAME sy-vline 
WA_SIQ_COLUMNS_STR-NULLSCOLUMN sy-vline 
WA_SIQ_COLUMNS_STR-UNIQUECOLUMN sy-vline 
WA_SIQ_COLUMNS_STR-PKEY sy-vline 
WA_SIQ_COLUMNS_STR-COLUMNTYPE sy-vline 
WA_SIQ_COLUMNS_STR-DEFAULTCOLUMN sy-vline 
WA_SIQ_COLUMNS_STR-COMPRESSEDVALUE sy-vline 
WA_SIQ_COLUMNS_STR-LOBINDEX sy-vline 
WA_SIQ_COLUMNS_STR-REMARKS sy-vline 
WA_SIQ_COLUMNS_STR-DBSPACENAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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