ABAP Select data from SAP table M_CRNOA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM M_CRNOA
*  INTO TABLE @DATA(IT_M_CRNOA2).
*--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_M_CRNOA INDEX 1 INTO DATA(WA_M_CRNOA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<M_CRNOA>-MANDT = 1.
<M_CRNOA>-CCINS = 1.
<M_CRNOA>-CCNUM = 1.
<M_CRNOA>-BUKRS = 1.
<M_CRNOA>-CCNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_M_CRNOA-CCTYP, sy-vline,
  WA_M_CRNOA-SAKNR, sy-vline,
  WA_M_CRNOA-KOSTL, sy-vline,
  WA_M_CRNOA-AUFNR, sy-vline,
  WA_M_CRNOA-LIFNR, sy-vline,
  WA_M_CRNOA-FIPOS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_M_CRNOA 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_M_CRNOA 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_M_CRNOA INTO WA_M_CRNOA.


*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.

*Conversion exit ALPHA, internal->external for field SAKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_CRNOA-SAKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_CRNOA-SAKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_CRNOA-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_CRNOA-KOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_CRNOA-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_CRNOA-AUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_CRNOA-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_CRNOA-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit FMCIS, internal->external for field FIPOS
CALL FUNCTION 'CONVERSION_EXIT_FMCIS_OUTPUT'
  EXPORTING
    input =                      WA_M_CRNOA-FIPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_CRNOA-FIPOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PS_PSP_PNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_M_CRNOA-PS_PSP_PNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_CRNOA-PS_PSP_PNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NPLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_CRNOA-NPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_CRNOA-NPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CRLIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_CRNOA-CRLIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_CRNOA-CRLIFNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_M_CRNOA_STR, 
MANDT TYPE STRING,
CCINS TYPE STRING,
CCNUM TYPE STRING,
BUKRS TYPE STRING,
CCNAME TYPE STRING,
CCTYP TYPE STRING,
SAKNR TYPE STRING,
KOSTL TYPE STRING,
AUFNR TYPE STRING,
LIFNR TYPE STRING,
FIPOS TYPE STRING,
FISTL TYPE STRING,
GEBER TYPE STRING,
CRCLASS TYPE STRING,
FIKRS TYPE STRING,
KOKRS TYPE STRING,
BLART TYPE STRING,
PERNR TYPE STRING,
PS_PSP_PNR TYPE STRING,
NPLNR TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
CRLIFNR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
WFOTYPE TYPE STRING,
WFOBJID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_M_CRNOA_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_M_CRNOA_STR-MANDT sy-vline 
WA_M_CRNOA_STR-CCINS sy-vline 
WA_M_CRNOA_STR-CCNUM sy-vline 
WA_M_CRNOA_STR-BUKRS sy-vline 
WA_M_CRNOA_STR-CCNAME sy-vline 
WA_M_CRNOA_STR-CCTYP sy-vline 
WA_M_CRNOA_STR-SAKNR sy-vline 
WA_M_CRNOA_STR-KOSTL sy-vline 
WA_M_CRNOA_STR-AUFNR sy-vline 
WA_M_CRNOA_STR-LIFNR sy-vline 
WA_M_CRNOA_STR-FIPOS sy-vline 
WA_M_CRNOA_STR-FISTL sy-vline 
WA_M_CRNOA_STR-GEBER sy-vline 
WA_M_CRNOA_STR-CRCLASS sy-vline 
WA_M_CRNOA_STR-FIKRS sy-vline 
WA_M_CRNOA_STR-KOKRS sy-vline 
WA_M_CRNOA_STR-BLART sy-vline 
WA_M_CRNOA_STR-PERNR sy-vline 
WA_M_CRNOA_STR-PS_PSP_PNR sy-vline 
WA_M_CRNOA_STR-NPLNR sy-vline 
WA_M_CRNOA_STR-DATAB sy-vline 
WA_M_CRNOA_STR-DATBI sy-vline 
WA_M_CRNOA_STR-CRLIFNR sy-vline 
WA_M_CRNOA_STR-OTYPE sy-vline 
WA_M_CRNOA_STR-OBJID sy-vline 
WA_M_CRNOA_STR-WFOTYPE sy-vline 
WA_M_CRNOA_STR-WFOBJID sy-vline      INTO ld_text SEPARATED BY SPACE.

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