package com.king.lesson03;

import com.king.lesson02.utils.JdbcUtils;

import java.sql.Connection;
import java.util.Date;
import java.sql.PreparedStatement;
import java.sql.SQLException;

//PreparedStatement与Statement相比，效率更高，同时也解决了sql注入问题
public class InertTest {
    public static void main(String[] args) {
        Connection conn=null;
        PreparedStatement st=null;



        try {
            conn=JdbcUtils.getConnection();

            //区别
            //可使用？，占位符代替参数
            String sql="INSERT INTO users(id,`NAME`,`PASSWORD`,email,birthday)" +
                    "VALUES(?,?,?,?,?)";

            st=conn.prepareStatement(sql);//需要预编译SQL，先写sql，然后不执行

            //手动给参数赋值
            st.setInt(1,5);//id
            st.setString(2,"kingss");
            st.setString(3,"111111");
            st.setString(4,"888888@qq.com");
            //注意点：sql.date 数据库 Java.sql.Date()
            //       util.Date Java     new Date().getTime()获得时间戳
            st.setDate(5,new java.sql.Date(new Date().getTime()));

            //执行
            int i=st.executeUpdate();//i返回一个受影响的行数
            if (i>0){
                System.out.println("插入成功");
                System.out.println(i);
            }


        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            JdbcUtils.release(conn,st,null);
        }

    }
}

//注意：删，改操作跟insert操作相似，只需要修改sql语句，和手动参数赋值语句就可实现

package com.king.lesson03;

import com.king.lesson02.utils.JdbcUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class SelectTest {
    public static void main(String[] args) {
        Connection conn=null;
        PreparedStatement st=null;
        ResultSet rs=null;

        try {
           conn=JdbcUtils.getConnection();

           String sql="select * from users where id=?";//编写sql

            st=conn.prepareStatement(sql);;//预编译

           st.setInt(1,1);//传递参数

            rs=st.executeQuery();//执行

            if (rs.next()){
                System.out.println(rs.getString("NAME"));
                System.out.println(rs.getObject("birthday"));
            }


        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            JdbcUtils.release(conn,st,rs);
        }

    }
}