tablestudentcourseconcert.java

来自「一个可以存储和打印成绩单的系统」· Java 代码 · 共 56 行

package org.wuhang.transfer;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Vector;
public class TableStudentCourseConcert {
	static HashMap<Integer,Integer> id_num = new HashMap<Integer,Integer>();
	public HashMap<Integer,Integer> getID_Num(){
		return id_num;
	}
	public void daoStudentCourse(Connection import_con,Connection export_con,
			HashMap<Integer,Integer> course_id_num,
			HashMap<Integer,Integer> student_id_num) {
		try {
    		PreparedStatement import_st = null;
			PreparedStatement export_st = null;
			Vector<Integer> student_id = new Vector<Integer>();
			Vector<Integer> course_id = new Vector<Integer>();
			Vector<String> grade = new Vector<String>();
			String export_sql = "select * from studentcourse";
			export_st = export_con.prepareStatement(export_sql);
			ResultSet rs = export_st.executeQuery();
			
			String import_sql = "insert into studentcourse (student_id,course_id,grade) values (?,?,?)";
			import_st = import_con.prepareStatement(import_sql);
			int count = 0;
			while(rs.next()){
				count++;
				id_num.put(rs.getInt("id"), count);
				student_id.addElement(rs.getInt("student_id"));
				course_id.addElement(rs.getInt("course_id"));
				grade.addElement(rs.getString("grade"));
			}
			rs.close();
			export_st.close();
			System.out.println(count);
			for(int i=0;i<count;i++){
				import_st.setInt(1, student_id_num.get(student_id.elementAt(i)));
			    import_st.setInt(2, course_id_num.get(course_id.elementAt(i)));
			    import_st.setString(3, grade.elementAt(i));
				import_st.execute();
			}
			
			import_st.close();
			import_con.commit();
			export_con.commit();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}