ABAP Select data from SAP table PREVIOUS_JOB_1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PREVIOUS_JOB_1 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 PREVIOUS_JOB_1. 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 PREVIOUS_JOB_1 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_PREVIOUS_JOB_1 TYPE STANDARD TABLE OF PREVIOUS_JOB_1,
      WA_PREVIOUS_JOB_1 TYPE PREVIOUS_JOB_1,
      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: <PREVIOUS_JOB_1> TYPE PREVIOUS_JOB_1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PREVIOUS_JOB_1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PREVIOUS_JOB_1
  INTO TABLE IT_PREVIOUS_JOB_1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PREVIOUS_JOB_1
*  INTO TABLE @DATA(IT_PREVIOUS_JOB_12).
*--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_PREVIOUS_JOB_1 INDEX 1 INTO DATA(WA_PREVIOUS_JOB_12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PREVIOUS_JOB_1 ASSIGNING <PREVIOUS_JOB_1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PREVIOUS_JOB_1>-PRJOB = 1.
<PREVIOUS_JOB_1>-PRCNT = 1.
<PREVIOUS_JOB_1>-UNAME = 1.
<PREVIOUS_JOB_1>-STDAY = 1.
<PREVIOUS_JOB_1>-STTME = 1.

ENDLOOP.

LOOP AT IT_PREVIOUS_JOB_1 INTO WA_PREVIOUS_JOB_1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PREVIOUS_JOB_1-DATUM, sy-vline,
  WA_PREVIOUS_JOB_1-UZEIT, sy-vline,
  WA_PREVIOUS_JOB_1-CHDAY, sy-vline,
  WA_PREVIOUS_JOB_1-CHTME, sy-vline,
  WA_PREVIOUS_JOB_1-CHNAM, sy-vline,
  WA_PREVIOUS_JOB_1-LTDAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PREVIOUS_JOB_1 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_PREVIOUS_JOB_1 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_PREVIOUS_JOB_1 INTO WA_PREVIOUS_JOB_1.


*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_PREVIOUS_JOB_1_STR, 
PRJOB TYPE STRING,
PRCNT TYPE STRING,
UNAME TYPE STRING,
STDAY TYPE STRING,
STTME TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
CHDAY TYPE STRING,
CHTME TYPE STRING,
CHNAM TYPE STRING,
LTDAY TYPE STRING,
LTTME TYPE STRING,
SERVR TYPE STRING,
TSYST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PREVIOUS_JOB_1_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_PREVIOUS_JOB_1_STR-PRJOB sy-vline 
WA_PREVIOUS_JOB_1_STR-PRCNT sy-vline 
WA_PREVIOUS_JOB_1_STR-UNAME sy-vline 
WA_PREVIOUS_JOB_1_STR-STDAY sy-vline 
WA_PREVIOUS_JOB_1_STR-STTME sy-vline 
WA_PREVIOUS_JOB_1_STR-DATUM sy-vline 
WA_PREVIOUS_JOB_1_STR-UZEIT sy-vline 
WA_PREVIOUS_JOB_1_STR-CHDAY sy-vline 
WA_PREVIOUS_JOB_1_STR-CHTME sy-vline 
WA_PREVIOUS_JOB_1_STR-CHNAM sy-vline 
WA_PREVIOUS_JOB_1_STR-LTDAY sy-vline 
WA_PREVIOUS_JOB_1_STR-LTTME sy-vline 
WA_PREVIOUS_JOB_1_STR-SERVR sy-vline 
WA_PREVIOUS_JOB_1_STR-TSYST sy-vline      INTO ld_text SEPARATED BY SPACE.

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