Why do you need DB2Factory?

The Short Answer:

Speed

Speed of development

Experience shows that at least 80 percent of the code volume of every database application can be determined based on the application's data definition language (DDL). 

Using DB2Factory can give you a huge head start on your next DB2 development project at a fraction of the cost of manual coding efforts.

Speed of execution

There are two basic ways to access DB2 data: Dynamic SQL and Static SQL (Static SQL is sometimes referred to as embedded SQL). 

DB2Factory produces SQL that will be statically bound against your DB2 database. Statically bound SQL will always result in the fastest possible response time for any given DB2 query.

 Be careful in your selection of middleware,
  ODBC and JDBC drivers use dynamic SQL.

 You can read for yourself what IBM has to say about Dynamic vs. Static SQL.