MyBatis学习（1）【主要是记录学习中出现的问题】

我用的是myeclipse2016和mysql

数据库代码（导进去时候把//后面的去掉）：

create database mybatis;
use mybatis;
create table tb_user(
	ID int(11) primary key auto_increment,    //自增长
	NAME varchar(18) default null,
	SEX char(2) default null,
	AGE int(11) default null
);

现在tb_user表是空的，现在目标是插入一条数据

我新建了一个web project项目

把包导进去：

因为我在创建java project时候Build Path-Add to Build Path，于是我Web Project这里也用了，以防万一,会多了这样一个东西

映射文件UserMapper.xml的代码

<?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="cn.dao.UserMapper">    
	<insert id="save" parameterType="cn.pojo.UserMapper" useGeneratedKeys="true">
		INSERT INTO TB_USER(name,sex,age) VALUES(#{name},#{sex},#{age})
	</insert>
</mapper>

实体类User.java代码

package cn.pojo;

import java.io.Serializable;

/**
 * @author AUSU
 *
 */
public class User implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private Integer id;            //用户标识
	private String name;           //用户姓名
	private String sex;            //用户性别
	private Integer age;           //用户年龄
	
	//无参数的构造方法       
	public User() {
		super();
		// TODO Auto-generated constructor stub
	}
	
	//有参数的构造方法
	public User(String name, String sex, Integer age) {
		super();
		this.name = name;
		this.sex = sex;
		this.age = age;
	}

	
	//setter和getter
	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}
	
	
}

测试类Test.java代码：

package cn.test;

import java.io.InputStream;


import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import cn.pojo.User;

public class Test {
	public static void main(String[] args) {
		SqlSession sqlSession = null;
		try(InputStream is = Resources.getResourceAsStream("mybatis-config.xml");)
		{
			SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
			sqlSession = sqlSessionFactory.openSession();
			
			User user = new User("admin","男",27);
			sqlSession.insert("cn.dao.save",user);    
			sqlSession.commit();
		}catch(Exception e){
			sqlSession.rollback();
			e.printStackTrace();
		}finally{
			try{
				if(sqlSession!=null)
					sqlSession.close();
			}catch(Exception e){
				e.printStackTrace();
			}
		}
		
	}

}

log4j.properties代码：

log4j.rootLogger=ERROR, stdout
log4j.logger.cn.dao.UserMapper=DEBUG
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

mybatis-config.xml代码：

<?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>

	<!-- 引入属性文件 -->
	<properties resource="database.properties"></properties>
	<!-- 日志 -->
	<settings>
		<setting name="logImpl" value="LOG4J" />
	</settings>

	<!-- 运行环境 -->
	<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://127.0.0.1:3306/mybatis" />
				<property name="username" value="root" />
				<property name="password" value="123" />
			</dataSource>
		</environment>
	</environments>
	<mappers>
		<mapper resource="cn/dao/UserMapper.xml" />
	</mappers>
</configuration>

运行后：