grademodel.java

关于JAVA的代码连接数据库

package GradeManagement.model;
import GradeManagement.util.SystemConstants;
import java.util.Observable;

public class GradeModel extends Observable {
   private StudentRoster students;          // 声明学生成绩簿
   private boolean computFlag = false;      // 成绩计算标志
   private int type ;                       // 学生类型
   private String disTitle = "";

   public GradeModel() {
      students = new StudentRoster();
      setType(0);
   }

   /*********属性相应的get/set方法*************/
   public boolean getComputFlag() {
     return this.computFlag;
   }

   public int getType() {
     return this.type;
   }

   public String getDisTitle() {
     this.disTitle = "学号" + "\t" + "姓名" + "\t";
     if( this.type == SystemConstants.COLLEGESTUDENT) {
       for(int i = 0; i < SystemConstants.COLSCOURSES.length; i++) {
         this.disTitle += SystemConstants.COLSCOURSES[i].getName() + "\t";
       } // for结束
     } else {
       for(int i = 0;i < SystemConstants.UNDGRSCOURSES.length; i++) {
         this.disTitle += SystemConstants.UNDGRSCOURSES[i].getName() + "\t";
       } // for结束
       this.disTitle += "论文成绩" + "\t"+ "论文标题" + "\t";
     }
     this.disTitle += "总成绩 " + "\t" + " 平均成绩 ";
     return this.disTitle;
   } // 方法getDisTitle()结束

   public void setComputFlag(boolean computFlag) {
       this.computFlag = computFlag;
       fireModelChanged();
     }

   public void setType( int type) {
     this.type = type;
     fireModelChanged();
   } // 方法setType结束

   public void addStudent( Student student ) {
     students.addStudent( student );
     fireModelChanged();
   }

  public void setModel(GradeModel model) {
    for(int i=0; i<model.size();i++) {
      students.addStudent(model.getIndex(i));
    }
    setType(model.getType());
    fireModelChanged();
  }

  // 排序
  public void sort() {
    students.sort();
    fireModelChanged();
  }

  public Object findById(Student student) {
    return students.findById(student);
  }

  public Object deleteStudent(Student student) {
     Object temp = students.deleteStudent( student );
     if(temp!=null)
       fireModelChanged();
     return temp;
  }

  public void clear() {
     students.clearRoster();
     fireModelChanged();
  }

  private void fireModelChanged() {
    setChanged();      // 设置变更标志
    notifyObservers(); // 通知视图,模型数据已变
  }

  public int size() {
    return students.size();
  }

  public Object getIndex(int index) {
    return students.getIndex(index);
  }

  // 写文件
  public boolean writeToFile() {
    return students.writeRecords();
  }
} // 类GradeModel结束