JavaWeb课程复习资料——idea创建JDBC

1、创建空的Java Project

输入项目名称

空项目

2、引入jar包步骤

依次点击 File -> Project Structure（快捷键 Ctrl + Alt + Shift + s），点击Project Structure界面左侧的“Modules”如图：

在 【Dependencies】 标签界面下，点击左边的 “+”号，选择第一个选项“JARs or directories…”，选择相应的jar包，点“OK”，jar包添加成功

获取驱动包：
链接：https://pan.baidu.com/s/1VQvpbcsYska_i5JVOCMxqg
提取码：yyds

3、驱动位置

【com.mysql.jdbc.Driver】

private static final String URL = "jdbc:mysql://localhost:3306/test?useUnicode&CharacterEncoding=utf-8";
private static final String USE = "root";
private static final String PASSWORD = "root";

4、创建【工厂类】的包与类

5、输入链接路径与账号密码

package com.item.jdbc;

/**
 * @author 为一道彩虹
 */
public class FactoryDB
{
    private static final String URL = "jdbc:mysql://localhost:3306/test?characterEncoding=utf-8";
    private static final String USER = "root";
    private static final String PASSWORD = "root";
}

6、创建访问数据链接方法

package com.item.jdbc;

import java.sql.*;

/**
 * @author 为一道彩虹
 */
public class FactoryDB
{
    private static final String URL = "jdbc:mysql://localhost:3306/test?characterEncoding=utf-8";
    private static final String USER = "root";
    private static final String PASSWORD = "root";

    //1.加载驱动
    static
    {
        try
        {
            Class.forName("com.mysql.cj.jdbc.Driver");
        }
        catch (ClassNotFoundException e)
        {
            e.printStackTrace();
        }
    }

    // 2.获取数据库连接
    public static Connection getConnection()
    {
        try
        {
            return DriverManager.getConnection(URL, USER, PASSWORD);
        }
        catch (SQLException throwables)
        {
            throwables.printStackTrace();
        }
        return null;
    }

    // 3.关闭资源
    public static void Close(Connection connection, PreparedStatement preparedStatement, ResultSet resultSet)
    {
        try
        {
            if (resultSet != null)
            {
                resultSet.close();
            }
            if (preparedStatement != null)
            {
                preparedStatement.close();
            }
            if (connection != null)
            {
                connection.close();
            }
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }
    }
}

7、创建测试数据表

CREATE TABLE `userinfo` (
  `id` int(8) NOT NULL AUTO_INCREMENT,
  `createDate` datetime NOT NULL,
  `userName` varchar(32) NOT NULL,
  `introduce` varchar(200) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
INSERT INTO userinfo VALUES (0,NOW(),'admin','管理员很厉害');
INSERT INTO userinfo VALUES (0,NOW(),'zhangsan','张三不认李四');
INSERT INTO userinfo VALUES (0,NOW(),'lisi','李四都认识');
INSERT INTO userinfo VALUES (0,NOW(),'wangwu','大刀王五');
INSERT INTO userinfo VALUES (0,NOW(),'zhaoliu','赵家老六');
INSERT INTO userinfo VALUES (0,NOW(),'ruanxiaoqi','打鱼的阮小七');
INSERT INTO userinfo VALUES (0,NOW(),'baxianwang','贤王一名');
select * from userinfo;

时间我没随机给，比较麻烦，自己改一下也行的哦。

8、创建测试类

包名：【com.item.demo】

类名：【Action】

package com.item.demo;

import com.item.jdbc.FactoryDB;

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

/**
 * @author 为一道彩虹
 */
public class Action
{
    public static void main(String[] args)
    {
        Connection conn = FactoryDB.GetConnection();
        PreparedStatement pre = null;
        ResultSet res = null;
        
        try
        {
            pre = conn.prepareStatement("select * from userinfo");
            res = pre.executeQuery();
            while (res.next())
            {
                System.out.print("id："+res.getInt(1)+"\t");
                System.out.print("createDate："+res.getTime(2)+"\t");
                System.out.print("userName："+res.getString(3)+"\t");
                System.out.println("introduce："+res.getString(4));
            }
        }
        catch (SQLException e)
        {
            e.printStackTrace();
        }
        finally
        {
            FactoryDB.Close(conn,pre,res);
        }
    }
}

查询成功：