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Dynamic Read from File into Internal Table

I'm trying to create a program that will read a file, perform some validation and then out put some messages based on the validation.

The program works perfectly (it's too large and complex to post on here) except when the columns in the source file are not in the correct order, because it is then reading the wrong data into the wrong columns.

I assume the use of field catalogs and field-symbols is needed but how can I read a text file


into an internal table with structure


where the field names will always equal the names of the columns in the structure.

The text file may not always be in the same order.

Thanks in advance.

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2 Answers

  • Best Answer
    Jan 13, 2015 at 09:52 AM

    Hi Benjamin,

    If you are uploading the Information from Test File, then read the all text file in default string based Internal table,(Field would be the same number as per your final requirement ).

    and then based on the Columns Name  (Exist on Text File), you have to create a dynamic table, and then the same you have to use for the further Logic.

    But if you are using Excel, then you can use the ALSM_EXCEL_TO_INTERNAL_TABLE function module, after that the process would be the same to create dynamic table.

    Though, text based internal table (Dynamic) and your primary internal table, columns would be the same only the sequence will be different

    So through the help of FIELD-SYMBOL, you can arrange the Information.

    Loop at test_intern_table (Dynamic) assign <text>.

         assign component FIELD_NAME of structure <text> to <val>.

         Main_intern_table-FIELD_NAME = <val>.


    Like above logic append the text fiel information to Main internal table.    




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  • Jan 12, 2015 at 04:14 PM

    Hi Benamin,

      Use ALSM_EXCEL_TO_INTERNAL_TABLE, that will read the header row. Based on the technical names received in the First row, form the Dynamic internal table and assign the data into the same.



                FILENAME                = P_file

                I_BEGIN_COL             = 1      "First Column

                I_BEGIN_ROW             = 1      "Header Row

                I_END_COL               = L_MAX_COL_NB

                I_END_ROW               = 9999


                INTERN                  = IT_EXCEL



                UPLOAD_OLE              = 2

                OTHERS                  = 3.

    Please find the link to create dynamic internal table.

    Create Dynamic Table using RTTS and display in ALV


    Rajkumar Narasimman

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