摘要： 1.java中父类引用指向子类如果父类和子类中有相同的方法，执行子类的方法Graphics gc= new Graphics(); Graphics图形 gc.calArea(); gc = new Rect(); Rect矩形 gc.calArea(); gc = new Circle(); Ci... 阅读全文

摘要： http://www.cnblogs.com/sc-xx/archive/2011/12/03/2275084.html关于游标的文件。create or replaceprocedure hourInDayaascursor unitAll is select unit_id from tbl_unit_info;--所有单位cursor typeAll is select id from tbl_en_type; --所有分类--cursor hournum is select EN_VAL_ORG,EN_VAL_STD,EN_COST,UNIT_ID,SUPER_ID,INDS_ID,E 阅读全文