向数据库里插入

package com.lianxi;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;
public class Test {
    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/boooks","root","tiger");
        Statement st=conn.createStatement();
    String bookname;
    int price;
    String author;
    String date;
    Scanner s=new Scanner(System.in);
        System.out.println("请输入书名");
        bookname=s.next();
        System.out.println("价格");
        price=s.nextInt();
        System.out.println("请输入作者");
        author=s.next();
        System.out.println("请输入日期");
        date=s.next();
    //拼一个sql语句
        String sql="insert into book values(null,‘"+bookname+"‘,"+price+",‘"+author+"‘,‘"+date+"‘)";
        System.out.println(sql);
        st.execute(sql);
System.out.println("插入成功");
        st.close();
        conn.close();
    }
    }