Starting with Oracle9i there is a feature that enables you to create what is called an EXTERNAL table. This is a read only table that you can use to extract data in your Oracle stored procedure. You may have to create a view on top of this external table.
For example, you may have a process that writes the SAP table data into a file. The external table will use that...
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file as its data source. Your view will be based on the external table and used in your stored procedure.
For example, say you have an external table called SAP_INVOICE_DISTRIBUTION that uses a file as follows:
CREATE TABLE SAP_INVOICE_DISTRIBUTION (header_id number, line_id number) ORGANIZATION EXTERNAL ( TYPE oracle_loader DEFAULT DIRECTORY data_dir ACCESS PARAMETERS ( RECORDS DELIMITED BY NEWLINE LOGFILE log_dir:'log_invoice_distribution' FIELDS TERMINATED BY ',' MISSING FIELDS ARE NULL ) LOCATION('invoice_distribution.data') ) PARALLEL 5 REJECT LIMIT UNLIMITED
The data_dir and log_dir need to be set up by your DBA.
Now, if you create a view sap_data_view as SELECT * FROM SAP_INVOICE_DISTRIBUTION, you can use the SAP_DATA_VIEW in your procedure to load data.
You can get fancy and dynamically create the tables using PL/SQL based on your different source files and data layout in the text files.
Dig Deeper on Using Oracle PL-SQL
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