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Types of Applications

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ODBC applications can be classified as follows:

  • Pure ODBC 2.
    x Application A 32-bit application that:

    • Calls only ODBC 2.x functions (including the ODBC 1.0 function SQLSetParam). These include ODBC 1.x applications that have been ported to 32-bit.

    • Expects ODBC 2.x behavior for features that have had behavioral changes. (See Behavioral Changes for more information.)

    • Has not been recompiled with ODBC 3.5 headers.

  • Pure ODBC 2.
    x Recompiled Application A pure ODBC 2.x application that has been recompiled using the ODBC 3.5 header files, by setting ODBCVER=0x0250.

  • Pure ODBC 2.
    x Unicode Application A pure ODBC 2.x recompiled application that is Unicode-compliant and uses the SQL_WCHAR data type.

  • Pure Open Group and ISO-compliant ODBC Application A 32-bit application that:

    • Calls functions defined in the Open Group or ISO CLI standards. (These functions may include deprecated 3.0 functions.)

    • Does not use the Unicode data types.

    • Expects ODBC 3.0 behavior for features that have had behavioral changes.

  • Pure ODBC 3.0 Application A 32-bit application that:

    • Is compiled with 3.0 headers.

    • Calls any ODBC 3.0 function, possibly including those that are deprecated.

    • Expects ODBC 3.0 behavior for features that have had behavioral changes.

  • Pure ODBC 3.5 Application A 32 or 64-bit application that:

    • May use Unicode data types.

    • Calls any ODBC 3.5 function, possibly including those that are deprecated.

    • Expects ODBC 3.5 behavior for features that have had behavioral changes.

  • Pure ODBC 3.8 (or later) Application A 32-bit or 64-bit application that:

    • May use Unicode data types.

    • Calls any ODBC 3.8 function, possibly including those that are deprecated.

    • Expects ODBC 3.8 behavior for features that have had behavioral changes.

  • Replaced Application A 32 or 64-bit application that:

    • Implements new behavior for duplicated functionality.

    • Uses any new features in a later version of ODBC only within conditional code.

    • Has limited conditional code to handle behavioral changes or has registered itself to be an earlier version of ODBC application.