day33 创建java的jdbc 工具类

package zuoye;

import java.sql.*;

public class zuoye {
    private static final String use="root";
    private static final String pws="root";
    private static final String ul="jdbc:mysql:///a";
    private static final String s="com.mysql.jdbc.Driver";
    //注册驱动
    static{
        try {
            Class.forName(s);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //连接数据库
    public static Connection getConnection() throws Exception {
        return DriverManager.getConnection(ul,use,pws);
    }
    //关闭资源
    public static void a(Connection conn, Statement stat){
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (stat!=null){
            try {
                stat.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    public static void a(Connection conn, Statement stat, ResultSet re){
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (stat!=null){
            try {
                stat.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(re!=null){
            try {
                re.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}