kechengbean.java

JSP开发的学生信息管理系统

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   KechengBean.java

package mypackage;

import java.io.PrintStream;
import java.sql.*;

// Referenced classes of package mypackage:
//			DataBaseConnection, Kecheng

public class KechengBean
{

	private Connection con;

	public KechengBean()
	{
		con = null;
		con = DataBaseConnection.getConnection();
	}

	public boolean existKecheng(Kecheng kecheng)
	{
		ResultSet resultset;
		String s = kecheng.getCourseId();
		String s1 = kecheng.getCourseName();
		PreparedStatement preparedstatement = con.prepareStatement("select courseId,courseName from kecheng where courseId='" + s + "' or courseName='" + s1 + "'");
		resultset = preparedstatement.executeQuery();
		Exception exception;
		return resultset.next();
		exception;
		return false;
	}

	public String addKecheng(Kecheng kecheng)
	{
		PreparedStatement preparedstatement;
		preparedstatement = null;
		String s = "";
		String s2;
		if (!existKecheng(kecheng))
			break MISSING_BLOCK_LABEL_23;
		s2 = "exist";
		return s2;
		String s1;
		try
		{
			preparedstatement = con.prepareStatement("insert into kecheng values(?,?,?,?,?)");
			preparedstatement.setString(1, kecheng.getCourseId());
			preparedstatement.setString(2, kecheng.getCourseName());
			preparedstatement.setInt(3, kecheng.getXuefen());
			preparedstatement.setString(4, kecheng.getCourseType());
			preparedstatement.setString(5, "1");
			preparedstatement.execute();
			s1 = "sucess";
		}
		catch (SQLException sqlexception)
		{
			System.err.println(sqlexception.getMessage());
			s1 = "failer";
		}
		break MISSING_BLOCK_LABEL_163;
		local;
		try
		{
			preparedstatement.close();
			con.close();
		}
		catch (Exception exception1)
		{
			exception1.printStackTrace();
		}
		JVM INSTR ret 6;
		return s1;
	}

	public String updateKecheng(Kecheng kecheng)
	{
		PreparedStatement preparedstatement = null;
		String s = "";
		try
		{
			preparedstatement = con.prepareStatement("update kecheng set courseName=?,xuefen=?,courseType=? where courseId=?");
			preparedstatement.setString(1, kecheng.getCourseName());
			preparedstatement.setInt(2, kecheng.getXuefen());
			preparedstatement.setString(3, kecheng.getCourseType());
			preparedstatement.setString(4, kecheng.getCourseId());
			preparedstatement.execute();
			s = "sucess";
		}
		catch (SQLException sqlexception)
		{
			System.err.println(sqlexception.getMessage());
			s = "failer";
		}
		finally
		{
			try
			{
				preparedstatement.close();
				con.close();
			}
			catch (Exception exception1)
			{
				exception1.printStackTrace();
			}
		}
		return s;
	}

	public String deleteKecheng(String s)
	{
		PreparedStatement preparedstatement = null;
		String s1 = "";
		try
		{
			preparedstatement = con.prepareStatement("update kecheng set flag=? where courseId=?");
			preparedstatement.setString(1, "2");
			preparedstatement.setString(2, s);
			preparedstatement.execute();
			s1 = "sucess";
		}
		catch (SQLException sqlexception)
		{
			System.err.println(sqlexception.getMessage());
			s1 = "failer";
		}
		finally
		{
			try
			{
				preparedstatement.close();
				con.close();
			}
			catch (Exception exception1)
			{
				exception1.printStackTrace();
			}
		}
		return s1;
	}

	public ResultSet executeQuery(String s)
	{
		Object obj = null;
		ResultSet resultset = null;
		try
		{
			Statement statement = con.createStatement(1005, 1008);
			resultset = statement.executeQuery(s);
		}
		catch (SQLException sqlexception)
		{
			System.err.println(sqlexception.getMessage());
		}
		return resultset;
	}

	public void close()
	{
		try
		{
			con.close();
		}
		catch (SQLException sqlexception)
		{
			sqlexception.printStackTrace();
		}
	}

	public String getAllCourse()
	{
		StringBuffer stringbuffer;
label0:
		{
			PreparedStatement preparedstatement = null;
			ResultSet resultset = null;
			stringbuffer = new StringBuffer();
			try
			{
				String s2;
				try
				{
					preparedstatement = con.prepareStatement("select courseId,courseName from kecheng");
					String s;
					String s1;
					for (resultset = preparedstatement.executeQuery(); resultset.next(); stringbuffer.append("<option value='" + s + "'>" + s1 + "</option>\n"))
					{
						s = resultset.getString("courseId");
						s1 = resultset.getString("courseName");
					}

					break label0;
				}
				catch (SQLException sqlexception)
				{
					s2 = "";
				}
				return s2;
			}
			finally
			{
				try
				{
					if (resultset != null)
						resultset.close();
					if (preparedstatement != null)
						preparedstatement.close();
					if (con != null)
						con.close();
				}
				catch (Exception exception1)
				{
					exception1.printStackTrace();
				}
			}
		}
		return stringbuffer.toString();
	}
}