Mybatis入门教程之增删查实例

三大框架入门都讲了，现在讲一个轻量级的框架Mybatis。

首先，要承认的是这个框架和Hibernate是类似的，更灵活，更容易学。

1.新建一个项目，加上Mybatis的核心包和数据库连接包

2.新建一个实体User，加上get，set方法

package com.qm.entity;

public class User {
	private int id;
	private String name;
	private String pwd;
	
	public User() {
	}
	
	public User(String name, String pwd) {
		this.name = name;
		this.pwd = pwd;
	}
	
	public User(int id, String name, String pwd) {
		super();
		this.id = id;
		this.name = name;
		this.pwd = pwd;
	}
	
	public int getId() {
		return id;
	}
	
	public void setId(int id) {
		this.id = id;
	}
	
	public String getName() {
		return name;
	}
	
	public void setName(String name) {
		this.name = name;
	}
	
	public String getPwd() {
		return pwd;
	}
	
	public void setPwd(String pwd) {
		this.pwd = pwd;
	}

	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + ", pwd=" + pwd + "]";
	}
}

3.新建一个配置文件conf.xml用来连接数据库

<environments default="development">
    <environment id="development">
        <transactionManager type="JDBC" />
        <dataSource type="POOLED">
            <property name="driver" value="com.mysql.jdbc.Driver" />
            <property name="url" value="jdbc:mysql://localhost:3306/ssh" />
            <property name="username" value="root" />
            <property name="password" value="root" />
        </dataSource>
    </environment>
</environments>

4.新建一个映射文件。userMapper.xml 里面可以直接写sql，非常灵活

<mapper namespace="com.qm.mapping.userMapper">

5.在配置文件注册

<mappers>
         <!-- 注册userMapper.xml文件-->
         <mapper resource="com/qm/mapping/userMapper.xml"/>
     </mappers>

6.新建一个测试类开始测试,这是添加

      String resource = "conf.xml";
      Reader reader;
try {
	reader = Resources.getResourceAsReader(resource);
	//构建sqlSession的工厂
	SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
               SqlSession session = sessionFactory.openSession();
              String statement="com.qm.mapping.userMapper.insertUser";
              User user1=new User("quanmin","888");
              session.insert(statement, user1);
              sessionmit();
} catch (IOException e) {
	e.printStackTrace();
} 

7.在映射文件写上对应的sql语句

运行结果

添加：刚刚添加的quanmin，看数据库

删除：删除刚刚添加的数据

通过id查找

查找所有：