MyBatis框架使用（一）

首先声明下：下面大部分代码取自传智播客视频。

以下代码尽供参考，学习之用。若有问题请联系本人。qq362601125

首先整个工程的结构图如下所示：

Mybatis一共有两个配置文件：myBatis-config.xml和实体类对应的XXXMapper.xml文件（这里以StudentMapper.xml为例）

Mybatis文件存放在src目录下

StudentMapper.xml和实体类Student在同一个目录下

整体的结构就是这个样子。

首先创建实体类Student:

package com.robert.Bean;

public class Student 
{
	private int id;
	private String name;
	private int age;
	private String birthday;
	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 int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getBirthday() {
		return birthday;
	}
	public void setBirthday(String birthday) {
		this.birthday = birthday;
	}
	
	public String toString() {
		return "id="+id+"\tname="+name+"\tage="+age+"\tbirthday="+birthday;
	}
}

Student对应的StudentMapper.xml文件如下所示：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.robert.Bean.Student">  
  <select id="selectStudents" resultType="com.robert.Bean.Student">
    select * from Student;
  </select>
</mapper>

myBatis-config.xml配置文件如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
  <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/test"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
      </dataSource>
    </environment>
  </environments>
  <mappers>
    <mapper resource="com/robert/Bean/StudentMapper.xml"/>
  </mappers>
</configuration>

测试程序如下：

package com.robert.test.Student;

import java.io.IOException;
import java.io.Reader;
import java.util.List;

import org.apache.ibatis.io.*;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import com.robert.Bean.*;

public class StudentTest 
{
	public static void main(String[] args)
	{
		String resource = "myBatis-config.xml";
		Reader reader = null;
		try {
			reader = Resources.getResourceAsReader(resource);
			SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
			SqlSession session = sessionFactory.openSession();
			List<Student> students = session.selectList("selectStudents"); 
			
			for(Student stu:students)
			{
				System.out.println(stu);
			}
			reader.close();
			session.close();
		} 
		catch (IOException e) 
		{
			e.printStackTrace();
		}
		finally
		{
			try {
				reader.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}

！！！

注意：在工程中要加入mysql驱动和mybatis.jar

建表的语句如下：

应该没什么问题了。

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