newstable.java

这是一个可以在手机客户端运行的选课系统 这个是客户端

package jdbc;
import java.sql.*;

public class NewsTable
{ 
	private String command=null;
	private Statement statement=null;
	
	public NewsTable(Statement statement)
	{
		this.statement=statement;	
	}
	
	public int insert(int newsID,String category,String date,String title,String detail) throws SQLException
	{
		command="INSERT INTO NewsTable" +" VALUES ("+newsID+",'"+category+"','"+date+"','"+title+"','"+detail+"')";
		return statement.executeUpdate(command);
	}
	
	public int delete(int newsID) throws SQLException
	{
		command="DELETE FROM NewsTable WHERE newsID="+newsID;		
		return statement.executeUpdate(command);
	}
	
	public int update(int newsID,String category,String date,String title,String detail) throws SQLException
	{
		command="UPDATE newsTable SET category='"+category+"',newsdate='"+date+"',title='"+title+"',detail='"+detail+"' WHERE newsID="+newsID;
		return statement.executeUpdate(command);	
	}
	
	public ResultSet select(int newsID) throws SQLException
	{
		if(newsID<0)
			command="SELECT * FROM newsTable";
		else	
			command="SELECT * FROM newsTable WHERE ID="+newsID;
		return statement.executeQuery(command);
	}
	
	public ResultSet selectCategory() throws SQLException
	{
		command="SELECT DISTINCT CATEGORY FROM NEWSTABLE";
		return statement.executeQuery(command);
	}
	
	public ResultSet selectTitle(String category) throws SQLException
	{
		command="SELECT * FROM NEWSTABLE WHERE CATEGORY='"+category+"'";
		return statement.executeQuery(command);
	}
}