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    Empress C++ Interface

     

    The Empress C++ Embedded SQL allows you to access and process data stored in Empress databases, using SQL commands from a C++ program. The following operations on tables in Empress databases are supported:

    • Adding rows to a table.
    • Updating rows in a table.
    • Deleting rows from a table.
    • Selecting rows from a table.
    • Adding, updating and deleting all or part of a context of selected rows.
    • Use of the transaction facilities of Empress to maintain data integrity.

    Empress provides a set of Database Manipulation routines for direct access to database structures using the C++ programming language. This interface provides faster execution times than any of the query language interfaces, since the parser is not invoked for each call. They also provide much greater control over what is done with the retrieved data, allowing you to perform complex arithmetic functions, generate custom-defined report formats, develop high-level user interfaces, and so on. The mr routines are grouped as follows:

    1. Open Routines
    2. Lock Routines
    3. Allocate Space Routines
    4. Attribute Descriptor Routines
    5. Filling Records Routines
    6. Insert Routines
    7. Delete Routines
    8. Update Routines
    9. Initialize Retrieval Routines
    10. Retrieval Routines
    11. Compare Routines
    12. Input Conversion Routines
    13. Qualification Routines
    14. Transaction Routines
    15. Expression Routines
    16. Error Handling Routines

 

                       
                             
                         

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