A computer implemented method for the automated construction of a computer program for allowing an application program to interface with an application database based on instructions received via the application program, the method comprising: storing a set of predefined discrete program code statements that each perform a distinct function or part function for interfacing with the database, at least one of the statements in the statement set containing one or more placeholders in which specification details can be inserted; receiving process, information and database parameter specifications; and responsive to receiving the specifications, automatically evaluating the specifications and thereafter implementing predefined embedded logic that is driven by the evaluation to: i) select a plurality of discrete program code statements from the stored set; ii) edit the selected discrete program code statements, where applicable, to insert specifications into the placeholders; and iii) combine the selected discrete program code statements in an order dictated by predefined logic; and wherein at least some of the discrete program statements are executable for processing inputs from and/or supplying outputs to the application program, and others are combined and executable for maintaining database integrity.