一、构建Spring Boot项目（maven方式）

方式一：通过SPRING INITIALIZR方式构建

 

方式二：直接写pom文件构建（这里已经引入springboot相关的jar包以及mybatise相关的jar包）

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.yan</groupId>
	<artifactId>otlan</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>otlan</name>
	<description>Project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.5.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.2</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<fork>true</fork>
				</configuration>
			</plugin>
		</plugins>
	</build>


</project>

构建后的maven项目结构为

二、application.properties配置

mybatis.type-aliases-package=com.neo.entity
mybatis.configuration.mapUnderscoreToCamelCase=true

spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/otl?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = 123456

三、编写mapper

package com.yan.otlan.sys.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.yan.otlan.sys.data.User;

@Mapper
public interface UserMapper {
	
	@Select("SELECT * FROM t_userinfo")
	@Results({
		@Result(property = "userNumber",  column = "id"),
		@Result(property = "id", column = "id")
	})
	List<User> getAll();
	
	@Select("SELECT * FROM t_userinfo WHERE id = #{id}")
	User getOne(Long id);

	@Insert("INSERT INTO t_userinfo(username,password,user_number) VALUES(#{username}, #{password}, #{userNumber})")
	void insert(User user);

	@Update("UPDATE t_userinfo SET username=#{username},password=#{password} WHERE id =#{id}")
	void update(User user);

	@Delete("DELETE FROM t_userinfo WHERE id =#{id}")
	void delete(Integer id);

}

四、建立mysql表

CREATE TABLE `NewTable` (
`id`  int(10) NOT NULL AUTO_INCREMENT ,
`username`  varchar(10) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL ,
`user_number`  int(10) NULL DEFAULT NULL ,
`password`  varchar(10) CHARACTER SET latin1 COLLATE latin1_swedish_ci NULL DEFAULT NULL ,
`deptid`  int(10) NULL DEFAULT NULL ,
UNIQUE INDEX `IDX_USERINFO_ID` (`id`) USING BTREE 
)
ENGINE=InnoDB
DEFAULT CHARACTER SET=latin1 COLLATE=latin1_swedish_ci
AUTO_INCREMENT=7
ROW_FORMAT=COMPACT
;

五、测试

package com.yan.otlan.sys;

import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import com.yan.otlan.sys.data.User;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {

	@Autowired
	private com.yan.otlan.sys.mapper.UserMapper userMapper;
	
	@Test
	public void testGetOne() {
		User user = userMapper.getOne(2l);
		System.out.println(user);
		
	}
	
	@Test
	public void testGetAll() {
		List<User> users = userMapper.getAll();
		
		for (User user : users) {
			System.out.println(user);
		}
	}
	
	@Test
	public void testInsert() {
		User user = new User();
		user.setUsername("李四");
		user.setUserNumber(0003);
		user.setPassword("zhangsan");
		
		userMapper.insert(user);
	}
	
	@Test
	public void testUpdate() {
		User user = new User();
		user.setId(7);
		user.setUsername("李四");
		user.setPassword("lisi11");
		
		userMapper.update(user);
	}
	
	@Test
	public void testDelete() {
		userMapper.delete(6);
	}
}

直接运行测试就OK了