SpringBoot整合MyBatis例子

1、pom.xml

<?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.java</groupId>
	<artifactId>HelloWorldSpringBoot</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>

	<name>HelloWorldSpringBoot</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.7.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>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-configuration-processor</artifactId>
			<optional>true</optional>
		</dependency>
		 <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <scope>provided</scope>
         </dependency>
         <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
         </dependency>

         <dependency>
         	<groupId>org.springframework.boot</groupId>
         	<artifactId>spring-boot-starter-thymeleaf</artifactId>
         </dependency>
         <dependency>
         	<groupId>org.springframework.boot</groupId>
         	<artifactId>spring-boot-starter-freemarker</artifactId>
         </dependency>


         <dependency>
         	<groupId>mysql</groupId>
         	<artifactId>mysql-connector-java</artifactId>
         	<scope>runtime</scope>
         </dependency>
         <dependency>
         	<groupId>org.springframework.boot</groupId>
         	<artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>

         <dependency>
         	<groupId>org.mybatis.spring.boot</groupId>
         	<artifactId>mybatis-spring-boot-starter</artifactId>
         	<version>1.3.1</version>
         </dependency>
	</dependencies>

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


</project>

2、项目结构

3、application.yml

server:
  port: 8080
  context-path: /
  
helloWorld: Hi,SpringBoot!  

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db_book
    username: root
    password: 123456
  jpa:
    hibernate:
      ddl-auto: update
      show-sql: true
      
mybatis: 
  mapperLocations: classpath:mapper/*.xml
  typeAliasesPackage: com.java.entity 

注意：是yml文件，不是xml文件！

4、mybatis基础配置

/**
 * MyBatis基础配置
 *
 * @author liuzh
 * @since 2015-12-19 10:11
 */
@Configuration
@EnableTransactionManagement
public class MyBatisConfig implements TransactionManagementConfigurer {

    @Autowired
    DataSource dataSource;

    @Bean(name = "sqlSessionFactory")
    public SqlSessionFactory sqlSessionFactoryBean() {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setTypeAliasesPackage("com.java.entity");

        //分页插件
       // ParserHelper pageHelper = new ParserHelper();
        Properties properties = new Properties();
        properties.setProperty("reasonable", "true");
        properties.setProperty("supportMethodsArguments", "true");
        properties.setProperty("returnPageInfo", "check");
        properties.setProperty("params", "count=countSql");
     
        //添加XML目录
        ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        try {
            bean.setMapperLocations(resolver.getResources("classpath:mapper/*.xml"));
            return bean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    @Bean
    public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
        return new SqlSessionTemplate(sqlSessionFactory);
    }

    @Bean
    @Override
    public PlatformTransactionManager annotationDrivenTransactionManager() {
        return new DataSourceTransactionManager(dataSource);
    }
}

5、mybaits接口扫描

/**
 * MyBatis扫描接口
 * 
 * @author liuzh
 * @since 2015-12-19 14:46
 */
//TODO 注意，由于MapperScannerConfigurer执行的比较早，所以必须有下面的注解
@Configuration
@AutoConfigureAfter(MyBatisConfig.class)
public class MyBatisMapperScannerConfig {

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory");
        mapperScannerConfigurer.setBasePackage("com.java.mapper");
        return mapperScannerConfigurer;
    }

}

6、SpringBoot Application启动

@SpringBootApplication
@MapperScan(basePackages = "com.java.dao")
public class HelloWorldSpringBootApplication {

	public static void main(String[] args) {
		SpringApplication.run(HelloWorldSpringBootApplication.class, args);
	}
}

7、Controller层

@RestController
@RequestMapping("/book")
public class BookController {

	@Value("${helloWorld}")
	private String hello;
	
	@Resource
	private BookDao bookDao;
	
	@RequestMapping("/helloWorld")
	public String say() {
		System.out.println(hello);
		return "Hello SpringBoot";
	}

	
	/**
	 * 查找所有
	 * @return
	 */
	@RequestMapping("/findAllList")
	public ModelAndView findAllList() {
		ModelAndView  mav = new ModelAndView("bookList");
		List<Book> bookList = bookDao.findAll();
		mav.addObject("bookList", bookList);
		return mav;
	}
	
}

8、Dao层

public interface BookDao {
	
	public List<Book> findAll();

}

9、mapper

<mapper namespace="com.java.dao.BookDao">
	
	<select id="findAll" resultType="Book">
		SELECT * FROM t_book
	</select>
	
</mapper> 

10、Thymeleaf模板引擎

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图书管理</title>
</head>
<body>
<table>
	<tr>
		<th>操作</th>
		<th>编号</th>
		<th>图书名称</th>
		<th>图书作者</th>
	</tr>
	<#list bookList as book>
	<tr>
		<td></td>
		<td>${book.id}</td>
		<td>${book.name}</td>
		<td>${book.author}</td>
	</tr>
	</#list>
</table>

</body>
</html>

11、数据库表结构

CREATE TABLE `t_book` (
  `id` varchar(255) NOT NULL,
  `name` varchar(100) DEFAULT NULL,
  `author` varchar(50) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

启动HelloWorldSpringBootApplication，请求http://localhost:8080/book/findAllList即可

12、效果

2018.11.13更新

本文成文与2017.11.06，一年之后，SpringBoot推出了2.0，MySQL数据库推出了8.0。如果使用SpringBoot2.0 + MyBatis + MySQL8.0，可参考https://blog.csdn.net/ryelqy/article/details/84030884解决兼容问题。

Reference：

[1] isea533, Spring Boot 集成MyBatis, http://blog.csdn.net/isea533/article/details/50359390
[2] 编程点滴, Spring Boot 整合 MyBatis, http://www.cnblogs.com/powercto/p/6717874.html