product.java

桌面销售管理系统 JDBC的基本应用

package dal;
import java.sql.ResultSet;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class Product
{
	//添加员工信息
	public static boolean add(model.Product m)
	{
		boolean b=false;
		try
		{
			String sql="insert into Product(P_name,P_price,P_remark) values(?,?,?)";
			PreparedStatement ps=SQLHelper.getConn().prepareStatement(sql);
			ps.setString(1,m.P_name);
			ps.setDouble(2,m.P_price);
			ps.setString(3,m.P_remark);
			b=SQLHelper.executeUpdate(ps);
		}
		catch(SQLException e)
		{
			System.out.println (e);
		}
		return b;
	}
	//删除员工信息
	public static boolean delete(int id)
	{
		boolean b=false;
		try
		{
			String sql="delete from Product where P_id=?";
			PreparedStatement ps=SQLHelper.getConn().prepareStatement(sql);
			ps.setInt(1,id);
			b=SQLHelper.executeUpdate(ps);
		}
		catch(SQLException e)
		{
			System.out.println (e);
		}
		return b;
	}
	
	//更新员工信息
	public static boolean update(model.Product m)
	{
		boolean b=false;
		try
		{
			String sql="update Product set P_name=?,P_price=?,P_remark=? where P_id=?";
			PreparedStatement ps=SQLHelper.getConn().prepareStatement(sql);
			ps.setString(1,m.P_name);
			ps.setDouble(2,m.P_price);
			ps.setString(3,m.P_remark);
			ps.setInt(4,m.P_id);
			System.out.println ("a");
			b=SQLHelper.executeUpdate(ps);
		}
		catch(SQLException e)
		{
			System.out.println (e);
		}
		return b;
	}
	
	//查询员工信息
	public static ResultSet list(String strWhere)
	{
		ResultSet rs=null;
		try
		{
			String sql="select * from Product";
			if(strWhere!="")
			{
				sql+=strWhere;
			}
			PreparedStatement ps=SQLHelper.getConn().prepareStatement(sql);
			rs=SQLHelper.executeQuery(ps);
		}
		catch(SQLException e)
		{
			System.out.println (e);
		}
		return rs;
	}
}