ABAP Select data from SAP table MMPUR_EXTPR_TECH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_EXTPR_TECH
*  INTO TABLE @DATA(IT_MMPUR_EXTPR_TECH2).
*--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_MMPUR_EXTPR_TECH INDEX 1 INTO DATA(WA_MMPUR_EXTPR_TECH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_EXTPR_TECH>-MANDT = 1.
<MMPUR_EXTPR_TECH>-PURCHASEREQUISITION = 1.
<MMPUR_EXTPR_TECH>-PURCHASEREQUISITIONITEM = 1.
<MMPUR_EXTPR_TECH>-EXTSOURCESYSTEM = 1.
<MMPUR_EXTPR_TECH>-PURREQNPROCESSINGTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_EXTPR_TECH-PURREQNPROCESSINGDATETIME, sy-vline,
  WA_MMPUR_EXTPR_TECH-ACTIVITY, sy-vline,
  WA_MMPUR_EXTPR_TECH-PURREQNEXTERNALREFERENCE, sy-vline,
  WA_MMPUR_EXTPR_TECH-PURREQNITEMEXTERNALREFERENCE, sy-vline,
  WA_MMPUR_EXTPR_TECH-PURREQNTYPEEXTERNALREFERENCE, sy-vline,
  WA_MMPUR_EXTPR_TECH-PURREQNORIGIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_EXTPR_TECH 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_MMPUR_EXTPR_TECH 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_MMPUR_EXTPR_TECH INTO WA_MMPUR_EXTPR_TECH.


*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 PURCHASEREQUISITION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_EXTPR_TECH-PURCHASEREQUISITION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_EXTPR_TECH-PURCHASEREQUISITION.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PURREQNEXTERNALREFERENCE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_EXTPR_TECH-PURREQNEXTERNALREFERENCE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_EXTPR_TECH-PURREQNEXTERNALREFERENCE.
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_MMPUR_EXTPR_TECH_STR, 
MANDT TYPE STRING,
PURCHASEREQUISITION TYPE STRING,
PURCHASEREQUISITIONITEM TYPE STRING,
EXTSOURCESYSTEM TYPE STRING,
PURREQNPROCESSINGTYPE TYPE STRING,
PURREQNPROCESSINGDATETIME TYPE STRING,
ACTIVITY TYPE STRING,
PURREQNEXTERNALREFERENCE TYPE STRING,
PURREQNITEMEXTERNALREFERENCE TYPE STRING,
PURREQNTYPEEXTERNALREFERENCE TYPE STRING,
PURREQNORIGIN TYPE STRING,
PURREQNEXTERNALSYSTEMID TYPE STRING,
PURREQNEXTERNALSYSTEMTYPE TYPE STRING,
STATE TYPE STRING,
PURREQNSHOPPINGCARTDOCNO TYPE STRING,
PURREQNSHOPPINGCARDITEMNO TYPE STRING,
PURREQNEXTRELEASESTATUS TYPE STRING,
PURREQNEXTRELEASEDATE TYPE STRING,
PURREQNPROCESSINGSTATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_EXTPR_TECH_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_MMPUR_EXTPR_TECH_STR-MANDT sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURCHASEREQUISITION sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURCHASEREQUISITIONITEM sy-vline 
WA_MMPUR_EXTPR_TECH_STR-EXTSOURCESYSTEM sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNPROCESSINGTYPE sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNPROCESSINGDATETIME sy-vline 
WA_MMPUR_EXTPR_TECH_STR-ACTIVITY sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNEXTERNALREFERENCE sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNITEMEXTERNALREFERENCE sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNTYPEEXTERNALREFERENCE sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNORIGIN sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNEXTERNALSYSTEMID sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNEXTERNALSYSTEMTYPE sy-vline 
WA_MMPUR_EXTPR_TECH_STR-STATE sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNSHOPPINGCARTDOCNO sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNSHOPPINGCARDITEMNO sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNEXTRELEASESTATUS sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNEXTRELEASEDATE sy-vline 
WA_MMPUR_EXTPR_TECH_STR-PURREQNPROCESSINGSTATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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