The SQL Descriptor Area (SQLDA) is a collection of variables
 used only in dynamic SQL programs.

 Dynamic SQL lets programs accept or generate SQL statements at
 run time, in contrast to precompiled statements which must be
 embedded in the program before it is compiled.  Unlike embedded
 statements, such dynamically-executed SQL statements are not
 necessarily part of the program's source code, but can be
 created while the program is running.  Dynamic SQL is useful
 when you cannot predict the type of SQL statement your program
 will need to process.

 SQL supports the SQLDA for languages that support pointer
 variables only.  The SQLDA provides information about dynamic
 SQL statements (the number and data type of a prepared
 statement's input and output parameters) to the program and
 information about memory allocated by the program (the addresses
 of input and output parameters) to SQL.

 See the appendix on the SQLDA in the Reference Manual for
 detailed information.