studentmanage.java

用JSP实现毕业设计选题系统,老师在网上出题,学生通过WEB来选题等功能

/**
 * 
 */
package student;

import util.ConnData;
import java.sql.*;

/**
 * @author 朱定芬
 *
 */
public class StudentManage 
{
	ConnData cd=null;
	Statement stmt=null;
	ResultSet rs=null;
	boolean bn=false;
	String sql=null;
	int i=0;
	public StudentManage()
	{
		cd=new ConnData();
		stmt=cd.OpenStmt();
	}
	
	//保存学生注册信息
	public int SaveStudentInfo(StudentBean sb)
	{
		try
		{
			sql="Insert Into Student(StudentID,StudentPsd,StudentName,StudentSex,StudentTel,StudentEmail,RegDate) Values('"
				+sb.getStudentID()+"','"
				+sb.getStudentPsd()+"','"
				+sb.getStudentName()+"','"
				+sb.getStudentSex()+"','"
				+sb.getStudentTel()+"','"
				+sb.getStudentEmail()+"','"
				+sb.getRegDate()+"')";
			i=stmt.executeUpdate(sql);
		}
		catch(SQLException se)
		{
			System.err.print(se.getMessage());
		}
		return i;
	}
	//修改学生信息
	public int EditStudentInfo(StudentBean sb)
	{
		try
		{
			sql="Update Student Set StudentName='"
				+sb.getStudentName()+"',StudentSex='"
				+sb.getStudentSex()+"',StudentTel='"
				+sb.getStudentTel()+"',StudentEmail='"
				+sb.getStudentEmail()+"' Where StudentID='"
				+sb.getStudentID()+"'";
			i=stmt.executeUpdate(sql);
		}
		catch(SQLException sqe)
		{
			System.err.print(sqe.getMessage());
		}
		return i;
	}
	//删除指定学生信息
	public int DeleteStudentInfo(String id)
	{
		try
		{
			sql="Delete From Student Where StudentID='"+id+"'";
			i=stmt.executeUpdate(sql);
		}
		catch(SQLException sqle)
		{
			System.err.print(sqle.getMessage());
		}
		return i;
	}
	//得到所有学生信息
	public ResultSet GetAllStudent()
	{
		try
		{
			sql="Select * From Student Order By RegDate";
			rs=stmt.executeQuery(sql);
		}
		catch(SQLException sqlex)
		{
			System.err.print(sqlex.getMessage());
		}
		return rs;
	}
	//得到指定学生信息
	public ResultSet GetOneStudent(String id)
	{
		try
		{
			sql="Select * From Student Where StudentID='"+id+"'";
			rs=stmt.executeQuery(sql);
		}
		catch(SQLException sqlex)
		{
			System.err.print(sqlex.getMessage());
		}
		return rs;
	}
	//检测用户是否存在
	public boolean ChkStudent(String id,String psd)
	{
		try
		{
			sql="Select * From Student Where StudentID='"+id+"' and StudentPsd='"+psd+"'";
			rs=stmt.executeQuery(sql);
			if(rs.next())
			{
				bn=true;
			}
			else
			{
				bn=false;
			}
		}
		catch(SQLException sqlex)
		{
			System.err.print(sqlex.getMessage());
		}
		return bn;
	}
	//检测ID号已经注册
	public boolean ChkID(String id)
	{
		try
		{
			sql="Select * From Student Where StudentID='"+id+"'";
			rs=stmt.executeQuery(sql);
			if(rs.next())
			{
				bn=true;
			}
			else
			{
				bn=false;
			}
		}
		catch(SQLException sqlexxx)
		{
			System.err.print(sqlexxx.getMessage());
		}
		return bn;
	}
	//修改学生密码
	public int UpdatePsd(StudentBean sb)
	{
		try
		{
			sql="Update Student Set StudentPsd='"
				+sb.getStudentPsd()+"' Where StudentID='"
				+sb.getStudentID()+"'";
			i=stmt.executeUpdate(sql);
		}
		catch(SQLException sqlexx)
		{
			System.err.print(sqlexx.getMessage());
		}
		return i;
	}
}