mybatis 的搭建并跑起来

1.首先到创建个数据库建个表吧

也许这样写无用,但是当个记录吧

CREATE TABLE `country` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `countryname` varchar(255) DEFAULT NULL,
  `countrycode` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;


CREATE TABLE `sys_privilege` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '权限ID',
  `privilege_name` varchar(50) DEFAULT NULL COMMENT '权限名称',
  `privilege_url` varchar(255) DEFAULT NULL COMMENT '权限url',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 COMMENT='权限表';


CREATE TABLE `sys_role` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '角色ID',
  `role_name` varchar(50) DEFAULT NULL COMMENT '角色名',
  `enabled` bigint(11) DEFAULT NULL COMMENT '有效标志',
  `create_by` bigint(20) DEFAULT NULL COMMENT '创建人',
  `create_time` datetime DEFAULT NULL COMMENT '创建时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8 COMMENT='角色表';


CREATE TABLE `sys_role_privilege` (
  `role_id` bigint(20) DEFAULT NULL COMMENT '角色ID',
  `privilege_id` bigint(20) DEFAULT NULL COMMENT '权限ID'
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='角色权限关联表';


CREATE TABLE `sys_user` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '用户ID',
  `user_name` varchar(50) DEFAULT NULL COMMENT '用户名',
  `user_password` varchar(50) DEFAULT NULL COMMENT '密码',
  `user_email` varchar(50) DEFAULT NULL COMMENT '邮箱',
  `user_info` text COMMENT '简介',
  `head_img` blob COMMENT '头像',
  `create_time` datetime DEFAULT NULL COMMENT '创建时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;


CREATE TABLE `sys_user_role` (
  `user_id` bigint(20) DEFAULT NULL COMMENT '用户Id',
  `role_id` bigint(20) DEFAULT NULL COMMENT '角色ID'
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户角色关联表';

插入表中的数据

INSERT INTO `country` VALUES ('1', '中国', 'CN');
INSERT INTO `country` VALUES ('2', '美国', 'US');
INSERT INTO `country` VALUES ('3', '俄罗斯', 'RU');
INSERT INTO `country` VALUES ('4', '英国', 'GB');
INSERT INTO `country` VALUES ('5', '法国', 'FR');


INSERT INTO `sys_privilege` VALUES ('1', '用户管理', '/users');
INSERT INTO `sys_privilege` VALUES ('2', '角色管理', '/roles');
INSERT INTO `sys_privilege` VALUES ('3', '系统日志', '/logs');
INSERT INTO `sys_privilege` VALUES ('4', '人员维护', '/persons');
INSERT INTO `sys_privilege` VALUES ('5', '单位维护', '/companies');


INSERT INTO `sys_role` VALUES ('1', '管理员', '1', '1', '2018-05-10 09:17:33');
INSERT INTO `sys_role` VALUES ('2', '普通用户', '1', '1', '2018-05-10 09:17:50');
INSERT INTO `sys_role` VALUES ('5', 'xiaomi', '1', '1', '2018-05-10 20:26:52');
INSERT INTO `sys_role` VALUES ('6', 'xiaomi', '1', '1', '2018-05-10 20:31:05');


INSERT INTO `sys_role_privilege` VALUES ('1', '1');
INSERT INTO `sys_role_privilege` VALUES ('1', '3');
INSERT INTO `sys_role_privilege` VALUES ('1', '2');
INSERT INTO `sys_role_privilege` VALUES ('2', '4');
INSERT INTO `sys_role_privilege` VALUES ('2', '5');


INSERT INTO `sys_user` VALUES ('1', '管理员', '123456', '[email protected]', '管理员', null, '2018-05-10 09:16:25');
INSERT INTO `sys_user` VALUES ('2', 'test', '123456', '123456', '测试用户', null, '2018-05-10 09:17:04');
INSERT INTO `sys_user` VALUES ('9', 'aQ', '123456', '[email protected]', 'aQ', null, '2018-05-10 16:09:38');
INSERT INTO `sys_user` VALUES ('10', 'aQ', '123456', '[email protected]', 'aQ', null, '2018-05-10 16:18:18');
INSERT INTO `sys_user` VALUES ('11', 'aQ', '123456', '[email protected]', 'aQ', null, '2018-05-10 16:18:44');
INSERT INTO `sys_user` VALUES ('12', 'aQ', '123456', '[email protected]', 'aQ', null, '2018-05-11 14:29:42');

INSERT INTO `sys_user_role` VALUES ('1', '1');
INSERT INTO `sys_user_role` VALUES ('1', '2');
INSERT INTO `sys_user_role` VALUES ('2', '2');

3.创建实体类和Mapper.xml(只提供属性)

public class Country {
	private  Long id;
	private String countryname;
	private String countrycode;}

创建Mapper接口CountryMapper.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">  
  <!-- namespace 命名空间 此处需要和你的CountryMapper 接口在同一个目录下 并且名字一样 -->
<mapper namespace="com.shouyiren.mapper.CountryMapper">  
    <!-- SQL语句 -->  
    
    <!-- resultType 需要返回的实体类的别名 -->
    <select id="selectAll" resultType="Country">
    	select id,countryname,countrycode from country
    </select>
</mapper>

创建接口CountryMapper.java

public interface CountryMapper {
	public List<Country> selectAll();
}

4. 添加mybatis-config的配置文件

<?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>
  	<!--  -->
  	<settings>
  		<!-- 添加的log日志 -->
  		<setting name="logImpl" value="LOG4J"/>
  		<!-- 自动映射驼峰命名法 -->
  		<setting name="mapUnderscoreToCamelCase" value="true"/>
  	</settings>
  	
  	<!-- 给实体类添加别名
  		只需要填写 实体类所在的包
  	 -->
  	<typeAliases>
  		<package name="com.shouyiren.entry"/>
  	</typeAliases>
  	
  	<!-- 数据库的连接信息 -->
  	<environments default="development">
  		<environment id="development">
  			<transactionManager type="JDBC"/>
  			<dataSource type="UNPOOLED">
  				<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>
  	
  	<!-- 引入 Mapper的配置文件 -->
  	<mappers>
  		<!-- <package name="com/shouyiren/mapper"/> -->
  		<mapper resource="com/shouyiren/mapper/CountryMapper.xml"/>
  	</mappers>
  	
  </configuration>

5.添加log日志配置信息

 ### 设置###
log4j.rootLogger = ERROR, stdout

#MyBatis 日志配置
#此处需要修改为自己Mapper的包名
log4j.logger.com.shouyiren.mapper=TRACE
### 输出信息到控制抬 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern =%5p [%t] - %m%n

6. 此处使用的Maven需要添加jar包坐标

<!-- 使用编码集为utf8 -->
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<!-- 添加Mybatis的依赖 -->
	<dependencies>
		<!-- 单元测试 begin -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		<!-- 单元测试 end -->

		<!-- mybatis begin -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.3.0</version>
		</dependency>
		<!-- mybatis end -->
	
		<!-- mysql begin -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.38</version>
		</dependency>
		<!-- mysql end -->

		<!-- 日志 begin -->
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.7.12</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.12</version>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>1.2.17</version>
		</dependency>
		<!-- 日志 end -->
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<source>1.8</source>
				</configuration>
			</plugin>
		</plugins>
	</build>

7.书写测试类

package com.shouyiren.test;

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

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.BeforeClass;
import org.junit.Test;

import com.shouyiren.entry.Country;

public class CountryMapperTest {
	
	//获取sqlSessionFactory 工厂根据  工厂创建SQLSession 对象连接
	private static  SqlSessionFactory sqlSessionFactroy;
	
	//此处读取mybatis-config的配置文件信息
	@BeforeClass
	public static void init(){
		try {
			Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
			sqlSessionFactroy = new SqlSessionFactoryBuilder().build(reader);
			reader.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void testSelectAll(){
		//获取sqlSession
		SqlSession openSession = sqlSessionFactroy.openSession();
		//此处使用的根据CountryMapper 接口中的方法名 查询数据 (原理以后说)
		List<Country> list = openSession.selectList("selectAll");
		
		printCountryList(list);
		openSession.close();
	}

	private void printCountryList(List<Country> list) {
			for (Country country : list) {
				System.out.printf("%-4d%4s%4s\n",country.getId(),country.getCountryname(),country.getCountrycode());
			}
	}
	
}

8. 测试结果和项目视图

https://img-blog.csdn.net/20180511230528299

https://img-blog.csdn.net/20180511230528597

mybatis 的搭建并跑起来

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