ABAP Select data from SAP table RJP_MG1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RJP_MG1 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 RJP_MG1. 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 RJP_MG1 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_RJP_MG1 TYPE STANDARD TABLE OF RJP_MG1,
      WA_RJP_MG1 TYPE RJP_MG1,
      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: <RJP_MG1> TYPE RJP_MG1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RJP_MG1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RJP_MG1
  INTO TABLE IT_RJP_MG1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJP_MG1
*  INTO TABLE @DATA(IT_RJP_MG12).
*--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_RJP_MG1 INDEX 1 INTO DATA(WA_RJP_MG12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RJP_MG1 ASSIGNING <RJP_MG1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJP_MG1>-MANDT = 1.
<RJP_MG1>-MED_PROD = 1.
<RJP_MG1>-MPG_LFDNR = 1.
<RJP_MG1>-MATNR = 1.
<RJP_MG1>-ISMPUBLDATE = 1.

ENDLOOP.

LOOP AT IT_RJP_MG1 INTO WA_RJP_MG1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJP_MG1-ISMISSUETYPEST, sy-vline,
  WA_RJP_MG1-ISMISSUETYPEAC, sy-vline,
  WA_RJP_MG1-ISMCOPYNR, sy-vline,
  WA_RJP_MG1-ISMNRINYEAR, sy-vline,
  WA_RJP_MG1-ISMYEARNR, sy-vline,
  WA_RJP_MG1-ISMPERRULE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJP_MG1 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_RJP_MG1 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_RJP_MG1 INTO WA_RJP_MG1.


*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 MATN1, internal->external for field MED_PROD
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RJP_MG1-MED_PROD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJP_MG1-MED_PROD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RJP_MG1-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJP_MG1-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ISMNRINYEAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RJP_MG1-ISMNRINYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJP_MG1-ISMNRINYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ISMPERRULE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RJP_MG1-ISMPERRULE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJP_MG1-ISMPERRULE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ISMMATNR_PATTERN
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RJP_MG1-ISMMATNR_PATTERN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJP_MG1-ISMMATNR_PATTERN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EAN11, internal->external for field EAN11
CALL FUNCTION 'CONVERSION_EXIT_EAN11_OUTPUT'
  EXPORTING
    input =                      WA_RJP_MG1-EAN11
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJP_MG1-EAN11.
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_RJP_MG1_STR, 
MANDT TYPE STRING,
MED_PROD TYPE STRING,
MPG_LFDNR TYPE STRING,
MATNR TYPE STRING,
ISMPUBLDATE TYPE STRING,
ISMISSUETYPEST TYPE STRING,
ISMISSUETYPEAC TYPE STRING,
ISMCOPYNR TYPE STRING,
ISMNRINYEAR TYPE STRING,
ISMYEARNR TYPE STRING,
ISMPERRULE TYPE STRING,
ISMFKALID TYPE STRING,
ISMMATNR_PATTERN TYPE STRING,
XGENERATE TYPE STRING,
MAKTX TYPE STRING,
XMARAEXIST TYPE STRING,
EAN11 TYPE STRING,
XARCHIVE TYPE STRING,
VPSTA TYPE STRING,
MARK TYPE STRING,
STAT_AMPEL TYPE STRING,
XDBEXIST TYPE STRING,
XPLAN_HORIZONT TYPE STRING,
PLAN_ICON_MPG TYPE STRING,
ARCHIVE_ICON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJP_MG1_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_RJP_MG1_STR-MANDT sy-vline 
WA_RJP_MG1_STR-MED_PROD sy-vline 
WA_RJP_MG1_STR-MPG_LFDNR sy-vline 
WA_RJP_MG1_STR-MATNR sy-vline 
WA_RJP_MG1_STR-ISMPUBLDATE sy-vline 
WA_RJP_MG1_STR-ISMISSUETYPEST sy-vline 
WA_RJP_MG1_STR-ISMISSUETYPEAC sy-vline 
WA_RJP_MG1_STR-ISMCOPYNR sy-vline 
WA_RJP_MG1_STR-ISMNRINYEAR sy-vline 
WA_RJP_MG1_STR-ISMYEARNR sy-vline 
WA_RJP_MG1_STR-ISMPERRULE sy-vline 
WA_RJP_MG1_STR-ISMFKALID sy-vline 
WA_RJP_MG1_STR-ISMMATNR_PATTERN sy-vline 
WA_RJP_MG1_STR-XGENERATE sy-vline 
WA_RJP_MG1_STR-MAKTX sy-vline 
WA_RJP_MG1_STR-XMARAEXIST sy-vline 
WA_RJP_MG1_STR-EAN11 sy-vline 
WA_RJP_MG1_STR-XARCHIVE sy-vline 
WA_RJP_MG1_STR-VPSTA sy-vline 
WA_RJP_MG1_STR-MARK sy-vline 
WA_RJP_MG1_STR-STAT_AMPEL sy-vline 
WA_RJP_MG1_STR-XDBEXIST sy-vline 
WA_RJP_MG1_STR-XPLAN_HORIZONT sy-vline 
WA_RJP_MG1_STR-PLAN_ICON_MPG sy-vline 
WA_RJP_MG1_STR-ARCHIVE_ICON sy-vline      INTO ld_text SEPARATED BY SPACE.

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