spring boot 整合mybatis 通过官方mybatis-spring-boot-starter

<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>com.cjwdemo.demoBySB</groupId>
<artifactId>demoBySB</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>demoBySB Maven Webapp</name>
<url>http://maven.apache.org</url>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- spring boot整合mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>
<!--mysql jdbc驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>

</dependencies>
<build>
<finalName>demoBySB</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
</project>

package com.cjwdemo.demoBySB.entity;

public class Userinfo {

private Integer id;
private String username;

public Integer getId() {
return id;
}

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

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

}

package com.cjwdemo.demoBySB.dao;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import com.cjwdemo.demoBySB.entity.Userinfo;

@Mapper
public interface UserinfoDao {

@Select("SELECT id, username FROM userinfo WHERE username = #{username}")
Userinfo findByUsername(@Param(value = "username") String username);

}

package com.cjwdemo.demoBySB.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.cjwdemo.demoBySB.dao.UserinfoDao;

@Controller
public class DemoController {

@Autowired
private UserinfoDao userinfoDao;

// 测试路由器 http://localhost:9999/ 默认是8080,但我把他配置为9999了
@RequestMapping(value = "/", method = RequestMethod.GET)
@ResponseBody
public String test() {
return "hello spring boot";
}

// 测试路由器 http://localhost:9999/test2 默认是8080,但我把他配置为9999了
@RequestMapping(value = "/test2", method = RequestMethod.GET)
@ResponseBody
public String test2() {
return userinfoDao.findByUsername("test").getUsername();
}

}

CREATE DATABASE test CHARSET utf8mb4;
USE test;

CREATE TABLE userinfo (
id INT(11) AUTO_INCREMENT NOT NULL COMMENT '主键',
username VARCHAR(20) NOT NULL COMMENT '用户名',
PRIMARY KEY (id)
)ENGINE=INNODB DEFAULT CHARSET utf8mb4 COMMENT '测试表';

INSERT INTO userinfo (username) VALUES('test');

https://github.com/mybatis/spring-boot-starter/wiki/Quick-Start