package cn.utils;
import java.sql.*;
public class DBconn {
    public static String url="jdbc:mysql://localhost:3306/test";
    public static String name="root";
    public static String pwd="123456";
    public static Connection conn=null;
    public static ResultSet rs=null;
    public static PreparedStatement ps=null;
    public static void init() {
        try{Class.forName("com.mysql.cj.jdbc.Driver");}catch (Exception e){
            System.out.println("加载失败");
            e.printStackTrace();
        }
        try {
            conn = DriverManager.getConnection(url,name,pwd);
        } catch (Exception e) {
            System.out.println("init [SQL驱动程序初始化失败！]");
            e.printStackTrace();
        }
    }
    public static ResultSet SelectSql(String sql) {
        System.out.println(sql);
        try {
            ps = conn.prepareStatement(sql);
            rs = ps.executeQuery(sql);
        } catch (SQLException e) {
            System.out.println("sql数据库查询异常");
            e.printStackTrace();
        }
        return rs;
    }

    public static int addUpdDel(String sql) {
        int i = 0;
        try {
            PreparedStatement ps = conn.prepareStatement(sql);
            i = ps.executeUpdate();
        } catch (SQLException e) {
            System.out.println("sql数据库增删改异常");
            e.printStackTrace();
        }

        return i;
    }

    public static void closeConn() {
        try {
            conn.close();
        } catch (SQLException e) {
            System.out.println("sql数据库关闭异常");
            e.printStackTrace();
        }
    }

}