ABAP Select data from SAP table CNV_BASIS_GENER_CONTEXT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_BASIS_GENER_CONTEXT
*  INTO TABLE @DATA(IT_CNV_BASIS_GENER_CONTEXT2).
*--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_CNV_BASIS_GENER_CONTEXT INDEX 1 INTO DATA(WA_CNV_BASIS_GENER_CONTEXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_BASIS_GENER_CONTEXT>-SYSTEM = 1.
<CNV_BASIS_GENER_CONTEXT>-DBSYS = 1.
<CNV_BASIS_GENER_CONTEXT>-SAPRL = 1.
<CNV_BASIS_GENER_CONTEXT>-UNAME = 1.
<CNV_BASIS_GENER_CONTEXT>-BATCH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_BASIS_GENER_CONTEXT-MANDT, sy-vline,
  WA_CNV_BASIS_GENER_CONTEXT-DATUM, sy-vline,
  WA_CNV_BASIS_GENER_CONTEXT-UZEIT, sy-vline,
  WA_CNV_BASIS_GENER_CONTEXT-CPROG, sy-vline,
  WA_CNV_BASIS_GENER_CONTEXT-TABLE, sy-vline,
  WA_CNV_BASIS_GENER_CONTEXT-NAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_BASIS_GENER_CONTEXT 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_CNV_BASIS_GENER_CONTEXT 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_CNV_BASIS_GENER_CONTEXT INTO WA_CNV_BASIS_GENER_CONTEXT.


*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_CNV_BASIS_GENER_CONTEXT_STR, 
SYSTEM TYPE STRING,
DBSYS TYPE STRING,
SAPRL TYPE STRING,
UNAME TYPE STRING,
BATCH TYPE STRING,
MANDT TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
CPROG TYPE STRING,
TABLE TYPE STRING,
NAME TYPE STRING,
FIELDS TYPE STRING,
TABLEN TYPE STRING,
CLIENTFNAME TYPE STRING,
SQLTABLE TYPE STRING,
TABFORM TYPE STRING,
TABTYPE TYPE STRING,
ISTABLECLUSTER TYPE STRING,
ISCLUSTERTABLE TYPE STRING,
SUBTABLES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_BASIS_GENER_CONTEXT_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_CNV_BASIS_GENER_CONTEXT_STR-SYSTEM sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-DBSYS sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-SAPRL sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-UNAME sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-BATCH sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-MANDT sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-DATUM sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-UZEIT sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-CPROG sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-TABLE sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-NAME sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-FIELDS sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-TABLEN sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-CLIENTFNAME sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-SQLTABLE sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-TABFORM sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-TABTYPE sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-ISTABLECLUSTER sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-ISCLUSTERTABLE sy-vline 
WA_CNV_BASIS_GENER_CONTEXT_STR-SUBTABLES sy-vline      INTO ld_text SEPARATED BY SPACE.

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