整合MyBatis

• 新建Spring Boot項(xiàng)目，或以Chapter1為基礎(chǔ)來(lái)操作
• pom.xml中引入依賴
• 這里用到spring-boot-starter基礎(chǔ)和spring-boot-starter-test用來(lái)做單元測(cè)試驗(yàn)證數(shù)據(jù)訪問(wèn)
• 引入連接mysql的必要依賴mysql-connector-java
• 引入整合MyBatis的核心依賴mybatis-spring-boot-starter
• 這里不引入spring-boot-starter-jdbc依賴，是由于mybatis-spring-boot-starter中已經(jīng)包含了此依賴

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.3.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<dependencies>

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

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

		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.1.1</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.21</version>
		</dependency>

	</dependencies>

• 同之前介紹的使用jdbc和spring-data連接數(shù)據(jù)庫(kù)一樣，在application.properties中配置mysql的連接配置

spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

同其他Spring Boot工程一樣，簡(jiǎn)單且簡(jiǎn)潔的的完成了基本配置，下面看看如何在這個(gè)基礎(chǔ)下輕松方便的使用MyBatis訪問(wèn)數(shù)據(jù)庫(kù)。

#使用MyBatis

• 在Mysql中創(chuàng)建User表，包含id(BIGINT)、name(INT)、age(VARCHAR)字段。同時(shí)，創(chuàng)建映射對(duì)象User

public class User {

    private Long id;
    private String name;
    private Integer age;

    // 省略getter和setter

}

• 創(chuàng)建User映射的操作UserMapper，為了后續(xù)單元測(cè)試驗(yàn)證，實(shí)現(xiàn)插入和查詢操作

@Mapper
public interface UserMapper {

    @Select("SELECT * FROM USER WHERE NAME = #{name}")
    User findByName(@Param("name") String name);

    @Insert("INSERT INTO USER(NAME, AGE) VALUES(#{name}, #{age})")
    int insert(@Param("name") String name, @Param("age") Integer age);

}

• 創(chuàng)建Spring Boot主類

@SpringBootApplication
public class Application {

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

}

• 創(chuàng)建單元測(cè)試
• 測(cè)試邏輯：插入一條name=AAA，age=20的記錄，然后根據(jù)name=AAA查詢，并判斷age是否為20
• 測(cè)試結(jié)束回滾數(shù)據(jù)，保證測(cè)試單元每次運(yùn)行的數(shù)據(jù)環(huán)境獨(dú)立

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
public class ApplicationTests {

	@Autowired
	private UserMapper userMapper;

	@Test
	@Rollback
	public void findByName() throws Exception {
		userMapper.insert("AAA", 20);
		User u = userMapper.findByName("AAA");
		Assert.assertEquals(20, u.getAge().intValue());
	}

}