mysql连接数据库并测试实例分享-mysql教程-PHP中文网

本文主要和大家分享mysql连接数据库并测试实例，希望能帮助到大家。

1.通过maven导入关于mybatis的jar包

mysql连接数据库并测试实例分享

可以通过阿里云的maven库直接下载相关jar包


    
        org.mybatis
        mybatis
        3.4.5
    

    MySQL
    mysql-connector-Java
    5.1.38

2.编写mybatis的配置文件

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PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">

3.编写映射文件UserMapper.xml

4.写出实体类User,很平常的类,就不在过多解释.

public class User {
private String username;
private String email;
private String password;
private String create_time;
public String getUsername() {
    return username;
}
public void setUsername(String username) {
    this.username = username;
}
public String getEmail() {
    return email;
}
public void setEmail(String email) {
    this.email = email;
}
public String getPassword() {
    return password;
}
public void setPassword(String password) {
    this.password = password;
}
public String getCreate_time() {
    return create_time;
}
public void setCreate_time(String create_time) {
    this.create_time = create_time;
}
@Override
public String toString() {
    return "User [username=" + username + ", email=" + email + ", password=" + password + ", create_time="
            + create_time + "]";
}
public User(String username, String email, String password, String create_time) {
    super();
    this.username = username;
    this.email = email;
    this.password = password;
    this.create_time = create_time;
}
public User() {
    super();
}

}

5.在写一个类MybatisSamples,里面包含main方法,进行测试.

具体代码如下

public static void main(String[] args) {
    String resource = "mybatis-config.xml";
    SqlSession session = null;
    try {
        InputStream is = Resources.getResourceAsStream(resource);
        //获取一个session工厂
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        //通过工厂获取session
        session = sqlSessionFactory.openSession();
        //根据映射文件中select标签的id获取集合
        List list = session.selectList("userMapper.selectUser");
        for(User user: list) {
            System.out.println(user);
            
        }
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }finally {
        //注意关闭session!!!
        session.close();
    }
    
}

执行结果如下: