ABAP Select data from SAP table DB6PMCIST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB6PMCIST 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 DB6PMCIST. 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 DB6PMCIST 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_DB6PMCIST TYPE STANDARD TABLE OF DB6PMCIST,
      WA_DB6PMCIST TYPE DB6PMCIST,
      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: <DB6PMCIST> TYPE DB6PMCIST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB6PMCIST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB6PMCIST
  INTO TABLE IT_DB6PMCIST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB6PMCIST
*  INTO TABLE @DATA(IT_DB6PMCIST2).
*--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_DB6PMCIST INDEX 1 INTO DATA(WA_DB6PMCIST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB6PMCIST ASSIGNING <DB6PMCIST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB6PMCIST>-INDSCHEMA = 1.
<DB6PMCIST>-INDNAME = 1.
<DB6PMCIST>-COLSEQ = 1.
<DB6PMCIST>-COLORDER = 1.
<DB6PMCIST>-DBCOLNO = 1.

ENDLOOP.

LOOP AT IT_DB6PMCIST INTO WA_DB6PMCIST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB6PMCIST-DBCOLNAME, sy-vline,
  WA_DB6PMCIST-DBCOLTYPE, sy-vline,
  WA_DB6PMCIST-DBCOLLEN, sy-vline,
  WA_DB6PMCIST-R3COLNAME, sy-vline,
  WA_DB6PMCIST-R3KEYCOL, sy-vline,
  WA_DB6PMCIST-R3COLTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB6PMCIST 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_DB6PMCIST 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_DB6PMCIST INTO WA_DB6PMCIST.


*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_DB6PMCIST_STR, 
INDSCHEMA TYPE STRING,
INDNAME TYPE STRING,
COLSEQ TYPE STRING,
COLORDER TYPE STRING,
DBCOLNO TYPE STRING,
DBCOLNAME TYPE STRING,
DBCOLTYPE TYPE STRING,
DBCOLLEN TYPE STRING,
R3COLNAME TYPE STRING,
R3KEYCOL TYPE STRING,
R3COLTYPE TYPE STRING,
R3COLLEN TYPE STRING,
PARTKEYSEQ TYPE STRING,
INLINE_LENGTH TYPE STRING,
HIDDEN TYPE STRING,
INDEXTYPE TYPE STRING,
DIMENSION TYPE STRING,
COLSEQ_DIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB6PMCIST_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_DB6PMCIST_STR-INDSCHEMA sy-vline 
WA_DB6PMCIST_STR-INDNAME sy-vline 
WA_DB6PMCIST_STR-COLSEQ sy-vline 
WA_DB6PMCIST_STR-COLORDER sy-vline 
WA_DB6PMCIST_STR-DBCOLNO sy-vline 
WA_DB6PMCIST_STR-DBCOLNAME sy-vline 
WA_DB6PMCIST_STR-DBCOLTYPE sy-vline 
WA_DB6PMCIST_STR-DBCOLLEN sy-vline 
WA_DB6PMCIST_STR-R3COLNAME sy-vline 
WA_DB6PMCIST_STR-R3KEYCOL sy-vline 
WA_DB6PMCIST_STR-R3COLTYPE sy-vline 
WA_DB6PMCIST_STR-R3COLLEN sy-vline 
WA_DB6PMCIST_STR-PARTKEYSEQ sy-vline 
WA_DB6PMCIST_STR-INLINE_LENGTH sy-vline 
WA_DB6PMCIST_STR-HIDDEN sy-vline 
WA_DB6PMCIST_STR-INDEXTYPE sy-vline 
WA_DB6PMCIST_STR-DIMENSION sy-vline 
WA_DB6PMCIST_STR-COLSEQ_DIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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