ABAP Select data from SAP table LDK31 into internal table
Get Example source ABAP code based on a different SAP table
Below is a number of ABAP code snippets to demonstrate how to select data from SAP LDK31 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 LDK31. 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 LDK31 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_LDK31 TYPE STANDARD TABLE OF LDK31, WA_LDK31 TYPE LDK31, 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: <LDK31> TYPE LDK31. *Process all fields in table header/work area as string values PERFORM process_as_string_field_values CHANGING wa_LDK31. SELECT * *restrict ABAP select to first 10 rows UP TO 10 ROWS FROM LDK31 INTO TABLE IT_LDK31. *Select data and declare internal table using in-line method @DATA *SELECT * * FROM LDK31 * INTO TABLE @DATA(IT_LDK312). *--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_LDK31 INDEX 1 INTO DATA(WA_LDK312). *Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL LOOP AT IT_LDK31 ASSIGNING <LDK31>.*To update a field value using a field symbol simply change the value via the field symbol pointer
<LDK31>-MATNR = 1.
<LDK31>-WERKS = 1.
<LDK31>-LGNUM = 1.
<LDK31>-LGTYP = 1.
<LDK31>-LGPLA = 1.
ENDLOOP. LOOP AT IT_LDK31 INTO WA_LDK31. *Write horizonal line to screen report. WRITE:/ sy-uline. *Write selected data to screen/report before conversion. WRITE:/ sy-vline, WA_LDK31-LPMAX, sy-vline,
WA_LDK31-LPMIN, sy-vline,
WA_LDK31-MAMNG, sy-vline,
WA_LDK31-NSMNG, sy-vline,
ENDLOOP. *Add any further fields from structure WA_LDK31 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_LDK31 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_LDK31 INTO WA_LDK31. *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 MATNR CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT' EXPORTING input = WA_LDK31-MATNR IMPORTING output = ld_input.
WRITE:/ 'Org Value:', WA_LDK31-MATNR.
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_LDK31_STR,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
LGPLA TYPE STRING,
LPMAX TYPE STRING,
LPMIN TYPE STRING,
MAMNG TYPE STRING,
NSMNG TYPE STRING,END OF T_EKKO_STR. DATA: WA_LDK31_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_LDK31_STR-MATNR sy-vline
WA_LDK31_STR-WERKS sy-vline
WA_LDK31_STR-LGNUM sy-vline
WA_LDK31_STR-LGTYP sy-vline
WA_LDK31_STR-LGPLA sy-vline
WA_LDK31_STR-LPMAX sy-vline
WA_LDK31_STR-LPMIN sy-vline
WA_LDK31_STR-MAMNG sy-vline
WA_LDK31_STR-NSMNG sy-vline INTO ld_text SEPARATED BY SPACE. *Add any further fields from structure WA_EKKO_STR you want to CONCATENATE... ENDLOOP. ENDFORM.