program-data independence

基本解釋

Program-data independence:It is a property of database system that the structure of data file is stored in the DBMS catalog separately from the access programs.
數(shù)據(jù)庫目錄包含每個文件的結(jié)構(gòu)，每條數(shù)據(jù)項的類型和存儲格式，以及針對數(shù)據(jù)的不同約束等信息。
In order to keep the data independence from application program, the necessary local logical data structure can be self-defined in every individual application program.
為了實現(xiàn)數(shù)據(jù)對應(yīng)用程序的獨立性，應(yīng)用程序自行定義所需要的局部邏輯數(shù)據(jù)結(jié)構(gòu)。