questionmanager.java

bbs论坛系统

package struts.business;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class QuestionManager {
	
    private static final String validate_question="Select * from questions where title=?";
	private static final String insert_question="insert into questions(author,title,content,type,level) values(?,?,?,?,?)";
	private static final String update_look="update questions set look_count=look_count+1";
	
	public boolean validate(String title)throws Exception
	{
		Connection con=null;
		DBUtility db=DBUtility.getInstance();
		try{
			con=db.getConnection();
			PreparedStatement stmt=con.prepareStatement(validate_question);
			stmt.setString(1,title);
			ResultSet rs=stmt.executeQuery();
			if(rs.next())
			{
				//int n=rs.getInt(1);
				//System.out.print(n);
				return true;
			}
			else
			{
				return false;
			}
		}
		catch(Exception e)
		{
			e.printStackTrace();
			throw e;
		}
		finally
		{
			db.closeConnection(con);
		}
	}
	public int insert(String author,String title,String content,
			String type,String level ) throws Exception 
	{
		Connection con=null;
		int result=0;
		DBUtility db=DBUtility.getInstance();
		try
		{
			con=db.getConnection();
			PreparedStatement stmt=con.prepareStatement(insert_question);
			stmt.setString(1, author);
			stmt.setString(2, title);
			stmt.setString(3, content);
			stmt.setString(4, type);
			stmt.setString(5,level);							
			result=stmt.executeUpdate();
		}
		catch(Exception e)
		{
			System.out.println(e.getMessage());
		}
		finally
		{
			db.closeConnection(con);
		}
		return result;
	}
	public int update_look() throws Exception
	{
		int result=0;
		Connection con=null;
		DBUtility db=DBUtility.getInstance();
		try
		{
			con=db.getConnection();
			PreparedStatement stmt=con.prepareStatement(update_look);
			
			result=stmt.executeUpdate();
		}
		catch(Exception e)
		{
			System.out.println(e.getMessage());
		}
		finally
		{
			db.closeConnection(con);
		}
		return result;
		
	}
   

}