1  –  cursor-name

    Specifies the name of the cursor you want to open. Use a
    parameter if the cursor referred to by the cursor name was
    declared at run time with a dynamic DECLARE CURSOR statement.
    Specify the parameter used for the cursor name in the extended
    dynamic DECLARE CURSOR statement.

    You can use a parameter to refer to the cursor name only when the
    OPEN statement refers to an extended dynamic cursor.

2  –  parameter

    Specifies the name of the cursor you want to open. Use a
    parameter if the cursor referred to by the cursor name was
    declared at run time with a dynamic DECLARE CURSOR statement.
    Specify the parameter used for the cursor name in the extended
    dynamic DECLARE CURSOR statement.

    You can use a parameter to refer to the cursor name only when the
    OPEN statement refers to an extended dynamic cursor.

3  –  USING

    Syntax options:

       USING parameter
       USING qualified-parameter
       USING DESCRIPTOR descriptor-name

    Specifies in dynamic SQL parameters (host language variables in
    a precompiled OPEN statement or formal parameters in an OPEN
    statement that is part of an SQL module language procedure)
    or qualified parameters (structures) whose values SQL uses to
    replace parameter markers in a prepared SELECT statement named
    in the cursor declaration. These parameters are not for use in
    interactive SQL. SQL replaces the parameter markers with the
    values of the host language variables when it evaluates the
    SELECT statement of the cursor. See the Oracle Rdb SQL Reference
    Manual for more information on the SQL module language and the
    SQL precompiler, respectively.

    You must specify the USING clause when both of the following
    conditions exist:

    o  The declaration of the cursor you are opening specifies a
       prepared SELECT statement name.

    o  The statement string for the prepared SELECT statement
       includes parameter markers.

    SQL does not allow the USING clause in an OPEN statement for a
    cursor that is not based on a prepared SELECT statement. For
    more information on parameter markers, see the PREPARE statement,
    and the chapter on dynamic SQL in the Oracle Rdb Guide to SQL
    Programming.

    There are two ways to specify parameters in a USING clause:

    o  With a list of parameters. The number of parameters in the
       list must be the same as the number of parameter markers in
       the prepared SELECT statement. (If any of the parameters in
       an OPEN statement is a host structure, SQL counts the number
       of variables in that structure when it compares the number of
       parameters in the USING clause with the number of parameter
       markers in the prepared SELECT statement.)

    o  With the name of a descriptor that corresponds to an SQLDA.
       Specify the name of the descriptor in the USING DESCRIPTOR
       clause. If you use the INCLUDE statement to insert the SQLDA
       into your program, the descriptor name is simply SQLDA.

       The SQLDA is a collection of variables used only in dynamic
       SQL. In an OPEN statement, the SQLDA points to a number
       of host language variables with which SQL replaces the
       parameter markers in a prepared SELECT statement. The number
       of variables must match the number of parameter markers.

    The data types of host language variables must be compatible with
    the values of the corresponding column of the cursor row.