学习日记

  This week,I have learned chapter 7-10 of this book,this is the second time  learning it.

  There are four typies of diagram in OO analysis.They are class diagram,use-case diagram,interaction diagram(sequence diagram or collaboration diagram),state diagram.

  I have a question is if struts class should be imported in at this phase.I learned a book there is a seqence diagram,it includes struts class.But,I think,we should know what should we do in the analysis phase.the result should be used in any oop design,for example:.net.So,I think struts class shouldn’t be imported at this time,but design phase.

  The state diagram is used to create method in a class.But I don’t know it clearly.

  After analysis phase,We should choose a plan according with the environment and post it to the manage department.

  In design phase,the package diagram is used to dividing sub system.at this phase,We should use state diagram to write pseudocode of a method’s logic of a class.

  The most valuable knowledge come from chapter 10–datebase design for me.especially oodb.The ability of OODB is exciting for me.It can support self definition data type and inheritance and other new charactor that relation db can’t support.I should learn it later.

  In our LD project,We should use another db type it between relation db and oo db called hybrid object-relational DBMS.

  In hybrid object-relational DBMS,if there are several child class for a parent class. the child class can be processed in two ways.one is using a table that represent a super set of all these class,another is every child class is a table and the key of this table is outer-key(I can’t understand it).