Mybatis基礎 環境配置 (1)

一、下載Mybatis  下載地址：github  https://github.com/mybatis/mybatis-3/releases

      zip包必選，Source code 可選（方便之後學習，全下載了）

二、解壓後以下圖：

lib中放的是 mybatis 依賴包， mybatis.jar 和 lib中的jar 都要導入項目中。

 

三、因爲要操做數據庫，因此還須要  JDBC driver for MySQL.

    官方地址：http://dev.mysql.com/downloads/connector/j/

    全部須要的文件我已經打包到騰訊雲，方便你們下載，但願騰訊雲不要像360雲盤如此噁心。

    下載地址：http://url.cn/40qtmQm

 

四、打開eclipse 新建 java 項目，導入全部jar包

 

五、成功後目錄以下圖：

   

 

六、新建mybatis配置文件，mapper文件，統一放在config文件夾下

 

mybatis-config.xml(文件名隨意)

<?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/mybatis" />
				<property name="username" value="root" />
				<property name="password" value="123456" />
			</dataSource>
		</environment>
	</environments>
	<mappers>
		<mapper resource="Mapper/UserMapper.xml" />
	</mappers>
</configuration>

UserMapper.xml

<?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="user">

	<select id="findUserById" parameterType="int" resultType="com.stones.mybatis.pojo.User">
		SELECT * FROM user WHERE id = #{id}
	</select>
	
</mapper>

pojo類

package com.stones.mybatis.pojo;

public class User {
	
	private int id;
	private String username;
	private String password;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	
}

測試類

package com.stones.mybatis.test;

import java.io.IOException;
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 org.junit.*;

import com.stones.mybatis.pojo.User;

public class Test2 {

	@Test
	public void test() throws IOException {
		
		String resource = "MybatisConfig.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
		
		SqlSession sqlSession = sqlSessionFactory.openSession();
		
		User user = sqlSession.selectOne("user.findUserById", 1);
		
		System.out.println(user.getUsername());
	}

}

七、日誌配置

log4j.properties

# Global logging configuration
#測試環境debug模式， 生產環境 info
log4j.rootLogger=DEBUG, stdout
# MyBatis logging configuration...
log4j.logger.org.mybatis.example.BlogMapper=TRACE
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n