determine.java

一个学生课绩管理系统

package database;

import java.sql.*;

public class determine {

	public ResultSet getClass(String tea_id) {
		String sql = "select classes.id,course.name  " + "from classes,course "
				+ "where course.id=classes.cour_id " + "and classes.tea_id='"
				+ tea_id + "' ";
		sqlBean sqlbean = new sqlBean();
		ResultSet rs = sqlbean.executeQuery(sql);
		return rs;

	}

	public ResultSet getStudents(String class_id) {
		String sql = "select student.id,name ,department,sex,mark,e_mail,tel "
				+ "from student,enrol,classes "
				+ "where student.id=enrol.stu_id " + "and enrol.accept='0' "
				+ "and classes.id=enrol.class_id " + "and classes.id='"
				+ class_id + "' ";
		sqlBean sqlbean = new sqlBean();
		ResultSet rs = sqlbean.executeQuery(sql);
		return rs;
	}

	public ResultSet getStudents2(String class_id) {
		String sql = "select student.id,name ,department,sex,mark,e_mail,tel "
				+ "from student,enrol,classes "
				+ "where student.id=enrol.stu_id " + "and enrol.accept='1' "
				+ "and enrol.score='0' " + "and classes.id=enrol.class_id "
				+ "and classes.id='" + class_id + "' ";
		sqlBean sqlbean = new sqlBean();
		ResultSet rs = sqlbean.executeQuery(sql);
		return rs;
	}

	public int enrol(String stu_id, String class_id) {
		int num = 0;
		String sql = "update enrol set accept=1  " + "where stu_id='" + stu_id
				+ "' " + "and class_id='" + class_id + "'  ";
		sqlBean db = new sqlBean();
		num = db.executeUpdate(sql);
		return num;
	}

	public int marking(String stu_id, String class_id, String score) {
		int num = 0;
		String sql = "update enrol " + "set score='" + score + "' "
				+ "where stu_id='" + stu_id + "' " + "and class_id='"
				+ class_id + "' ";
		sqlBean db = new sqlBean();
		num = db.executeUpdate(sql);
		return num;

	}

	public int addMark(String stu_id, String class_id) {
		int num = 0;
		String sql = "update student "
				+ "set student.mark=student.mark+course.mark "
				+ "from student,course,classes " + "where student.id='"
				+ stu_id + "' " + "and course.id=classes.cour_id "
				+ "and classes.id='" + class_id + "' ";
		sqlBean db = new sqlBean();
		num = db.executeUpdate(sql);
		return num;

	}
}