Hierarchical database apparatus, components selection method in hierarchical database, and components selection program

摘要

A database apparatus stores a first contents table which includes first components including first contents data rows, and a second contents table which includes second components including second contents data rows. The first and second contents data rows each have a selection reference relationship between the first and second contents tables, and a selection reference condition is described using a selection reference type property. A selection reference processor is configured to query the second contents table under the selection reference condition to find candidates of second contents data rows. The candidates are referenced from a selected first contents data row according to the selection reference relationship. At least one second contents data row designated in the candidates displayed on the screen is selected. A combination device is configured to generate a combined contents table corresponding to a combined-type product, by combining the first and second contents data rows.