JDBC：java连接数据库操作

               1. 把jar放入到工程下并add Libaray
               2. 加载驱动 Class.forName("com.mysql.cj.jdbc.Driver");
               3. 获取链接对象

                Connection connection=DriverManager.getConnection(url,user,password);
               4. 获取执行sql语句的对象: Statement statement=connection.createStatement();
               5. 执行sql语句 int row=statement.executeUpdate(sql); 或  ResultSet                                resultSet=statement.executeQuery(sql); 遍历结果集
               6. 关闭资源 

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

public class Jdbc07 {
    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement ps = null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/ceshi?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai","root","123456");
            String sql = "insert into student values(?,?,?,?)";
            ps = conn.prepareStatement(sql);
            Object[] objects = {5,"老代",15,3};
            for (int i =1;i<=objects.length;i++){
                ps.setObject(i,objects[i-1]);
            }
            int j  = ps.executeUpdate();
            System.out.println(j);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        } finally {
            try {
                if(ps!=null){
                    ps.close();
                }

            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }finally {
                try {
                    if(conn!=null) {
                        conn.close();
                    }
                } catch (SQLException throwables) {
                    throwables.printStackTrace();
                }
            }
        }

    }
}