spring-boos中引入mybatis示例

上一篇文章介绍了如何使用spring-boot搭建一个简单的web应用。这篇重点介绍如何把mybatis引入到其中。

1、pom.xml中引入：

<properties>
    <mybatis-spring-boot>1.2.0</mybatis-spring-boot>
    <mysql-connector>5.1.39</mysql-connector>
  </properties>
<!-- Spring Boot Mybatis 依赖 -->
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${mybatis-spring-boot}</version>
    </dependency>
    
     <!-- MySQL 连接驱动依赖 -->
     <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <version>${mysql-connector}</version>
     </dependency>

整个工程结构如下图

2、entity实体类：

public class Test {
	private Long id;
	private String name;
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

3、dao接口：

public interface TestDao {
	/**
     * 根据名称，查询test信息
     *
     * @param name 名
     */
    Test findByName(@Param("name") String n);
}

Mybatis是基于接口编程的，我们写好接口，对应编写映射文件中的sql语句即可，非常灵活。

4、mapper.xml文件：

在resources文件夹下新建一个mapper文件夹，里面存放mybatis的mapper XML映射文件。

<?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="nc.edu.nuc.dao.mysql.TestDao">  
    <resultMap id="BaseResultMap" type="nc.edu.nuc.entity.Test">  
        <result column="id" property="id" />  
        <result column="name" property="name" />  
    </resultMap>  
  
    <parameterMap id="Test" type="nc.edu.nuc.entity.Test"/>  
  
    <sql id="Base_Column_List">  
        id,name  
    </sql>  
  
    <select id="findList" resultMap="BaseResultMap">  
        select  
        <include refid="Base_Column_List" />  
        from test  
    </select>  
  
    <select id="findByName" resultMap="BaseResultMap" parameterType="java.lang.String">  
        select  
        <include refid="Base_Column_List" />  
        from test  
        where name = #{name}  
    </select>  
      
    <insert id="save" parameterType="Test">  
        insert into test   
        (name)   
        values   
        (#{name})  
    </insert>  
      
</mapper>

5、service类：

@Service
public class TestService{
	
	@Autowired  
	private TestDao testDao;  
	
	public Test findByName(String name) {
		return testDao.findByName(name);
	}
	
	
}

6、controller接口：

@Controller
public class TestController {
	
	@Autowired
	private TestService testService;
	
	@RequestMapping("test")
    @ResponseBody
    public String home(HttpServletRequest request) {
		String name = request.getParameter("name");
		Test findByName = testService.findByName(name);
        return findByName.toString();
    }

}

7、启动类：

@SpringBootApplication
//mapper 接口类扫描包配置
@MapperScan("nc.edu.nuc.dao.mysql")
public class App 
{
    public static void main( String[] args )
    {
    	SpringApplication.run(App.class, args);
    }
}

在启动泪伤添加一个@MapperScan的注解，也可以在每一个Dao类上添加一个@Mapper的注解。

application.properties:

##mysql配置
spring.datasource.url=jdbc:mysql://jy.ttengine.w.abc.db:1883/ttengine?useUnicode=true&characterEncoding=utf8
spring.datasource.username=ttengine
spring.datasource.password=TTengine123
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

## Mybatis配置
mybatis.typeAliasesPackage=cn.edu.nuc.springbootmybatis.entity
mybatis.mapperLocations=classpath:mapper/*.xml


# 页面默认前缀目录
spring.mvc.view.prefix=/WEB-INF/page/
spring.mvc.view.suffix=.jsp

参考：https://github.com/JeffLi1993/springboot-learning-example

spring-boos中引入mybatis示例

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