Mybatis入門教程之增刪查實例

三大框架入門都講了，現在講一個輕量級的框架Mybatis。

首先，要承認的是這個框架和Hibernate是類似的，更靈活，更容易學。

1.新建一個項目，加上Mybatis的核心包和數據庫連接包

2.新建一個實體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.新建一個配置文件conf.xml用來連接數據庫

<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.新建一個映射文件。userMapper.xml 裏面可以直接寫sql，非常靈活

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

5.在配置文件註冊

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

6.新建一個測試類開始測試,這是添加

      String resource = "conf.xml";
      Reader reader;
try {
	reader = Resources.getResourceAsReader(resource);
	//構建sqlSession的工廠
	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);
              session.commit();
} catch (IOException e) {
	e.printStackTrace();
} 

7.在映射文件寫上對應的sql語句

運行結果

添加：剛剛添加的quanmin，看數據庫

刪除：刪除剛剛添加的數據

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