新闻发布项目——接口类（BaseDao）

package bdqn.newsMange.Dao;
/**
 * 公共类
 * @author Administrator
 *
 */
import java.sql.*;
import java.util.List;
public class BaseDao {
	Connection conn=null;
	PreparedStatement ps=null;
	ResultSet rs=null;
	
	public Connection getConnection() throws ClassNotFoundException, SQLException{
		
			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
		if(conn==null){
			conn=DriverManager.getConnection("jdbc:sqlserver://127.0.0.1:1433;databasename=newsDB;User=sa;Password=171268");
		
		}
		return conn;
	}
	
	//增删改
	public int executeUpdate(String sql, List<Object> prams)
			throws ClassNotFoundException, SQLException {
		int rel = -1;

		conn = getConnection();
		/*if(conn.isClosed())
		{
			conn=null;
			conn = getConnection();
		}*/
		ps = conn.prepareStatement(sql);
		
		if (prams != null) {
			for (int i = 0; i < prams.size(); i++) {
				ps.setObject(i + 1, prams.get(i));
			}
		}

		rel = ps.executeUpdate();
		return rel;
	}
	
	//查询
	public ResultSet executeQurey(String sql,List<Object>prams) throws ClassNotFoundException, SQLException{
		conn=getConnection();
		ps=conn.prepareStatement(sql);
		if(prams!=null){
			for (int i = 0; i < prams.size(); i++) {
				ps.setObject(i+1, prams.get(i));
			}
		}
		rs=ps.executeQuery();
		return rs;
	}
	
	//关闭资源
	
	public void closeAll(){
		if(rs!=null){
			try {
				rs.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if(ps!=null){
			try {
				ps.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		if(conn!=null){
			try {
				conn.close();
				conn=null;
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}