JDBC基础：https://blog.csdn.net/weixin_44893902/article/details/106746880

Dbconnection工具类（包含了连接，增删改查，关闭）

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

import javax.swing.JOptionPane;

import com.mysql.jdbc.Statement;

public class DbConnection {
    //驱动类的类名
    private static final String DRIVERNAME="com.mysql.jdbc.Driver";
    //连接数据的URL路径
    private static final String URL="jdbc:mysql://127.0.0.1:3306/moviedb";
    //数据库登录账号
    private static final String USER="root";
    //数据库登录密码
    private static final String PASSWORD="root123";
    //加载驱动
    static{
        try {
            Class.forName(DRIVERNAME);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
    //获取数据库连接
    public static Connection getConnection() {
              try {
        return DriverManager.getConnection(URL,USER,PASSWORD);
               } catch (SQLException e) {
        e.printStackTrace();
               }
            return null;
    }
    //查询
    public static ResultSet query(String sql) {
        System.out.println(sql);
        //获取连接
        Connection connection=getConnection();
        PreparedStatement psd;
        try {
            psd = connection.prepareStatement(sql);
            return psd.executeQuery();
        } catch (SQLException e) {
            JOptionPane.showMessageDialog(null,"执行语句出错\n"+e.toString());
            e.printStackTrace();
        }
        return null;
    }
    //增、删、改、查
        public static int updataInfo(String sql) {
            System.out.println(sql);
            //获取连接
            Connection connection=getConnection();
            try {
                PreparedStatement psd=connection.prepareStatement(sql);
                return psd.executeUpdate();
            } catch (SQLException e) {
                JOptionPane.showMessageDialog(null,"执行语句出错\n"+e.toString());
                e.printStackTrace();
            }
            return 0;
        }
    //关闭连接
    public static void colse(ResultSet rs,Statement stmt,Connection  conn) throws Exception{
        try {
            if (rs != null){
                rs.close();
            }
            if (stmt != null){
                stmt.cancel();
            }
         if (conn != null) { conn.close(); }
       } catch (Exception e) {
           e.printStackTrace(); throw new Exception();
       }
    }
}