SpringbBoot學習——3——SpringBoot數據訪問

springboot整合使用JdbcTemplate
pom文件引入：

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>
	<dependencies>
		<!-- jdbcTemplate 依賴 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-jdbc</artifactId>
		</dependency>
		<!-- mysql 依賴 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<!-- 測試 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<!-- springboot-web組件 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
	</dependencies>

application.properties新增配置

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

UserService類

@Service
public class UserServiceImpl implements UserService {
	@Autowired
	private JdbcTemplate jdbcTemplate;
	public void createUser(String name, Integer age) {
		jdbcTemplate.update("insert into users values(null,?,?);", name, age);
	}
}

啓動類：

@SpringBootApplication
public class App {

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

}
這裏的@SpringBootApplication註解就相當於@ComponentScan(basePackages = { "com.itmayiedu.controller", "com.itmayiedu.service" })
和@EnableAutoConfiguration

springboot整合使用mybatis
pom文件引入

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<!-- 測試 -->
		<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>
		<!-- mysql 依賴 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<!-- springboot-web組件 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
	</dependencies>

配置文件application.properties：

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

mapper代碼和實體類通過mybatis的逆向工程獲得。
啓動類：

@MapperScan("com.springboot.mapper")
//@EnableAutoConfiguration
@SpringBootApplication
public class MybatisApp {

	public static void main(String[] args) {
		SpringApplication.run(MybatisApp.class, args);
	}
}
此處注意MapperScan註解的掃包，掃描mapper文件所在的包

Mybatis整合分頁插件
Page-helper 是一款好用的開源免費的 Mybatis 第三方物理分頁插件
物理分頁
支持常見的 12 種數據庫。Oracle,MySql,MariaDB,SQLite,DB2,PostgreSQL,SqlServer 等
支持多種分頁方式
支持常見的 RowBounds(PageRowBounds)，PageHelper.startPage 方法調用，Mapper 接口參數調用
maven依賴：

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>
	<dependencies>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<!-- 測試 -->
		<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>
		<!-- mysql 依賴 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<!-- springboot-web組件 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- springboot 整合 pagehelper -->
		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper-spring-boot-starter</artifactId>
			<version>1.2.5</version>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
			<version>3.7</version>
		</dependency>
	</dependencies>

在application.propeties配置文件中引出pagehelper的配置文件

##pagehelper
mybatis.configLocation=classpath:mybatis/mybatis-config.xml

mybats-config.xml:

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 
"http://mybatis.org/dtd/mybatis-3-config.dtd"> 
<configuration> 
<!-- 配置pageHelper分頁查詢插件 --> 
<plugins> 
        <plugin interceptor="com.github.pagehelper.PageInterceptor"> 
            <property name="helperDialect" value="mysql"/> 
        </plugin> 
    </plugins> 
</configuration> 

實體類：

public class User {

	private Integer id;
	private String name;
	private Integer age;
	對應的get set方法；
}

Mapper文件：

public interface UserMapper {
	@Select("SELECT * FROM USERS ")
	List<User> findUserList();
}

Service層

@Service
public class UserService {
	@Autowired
	private UserMapper userMapper;

	/**
	 * page 當前頁數<br>
	 * size 當前展示的數據<br>
	 * 
	 * @param page
	 * @param size
	 * @return
	 */
	public PageInfo<User> findUserList(int page, int size) {
		// 開啓分頁插件,放在查詢語句上面
		PageHelper.startPage(page, size);
		List<User> listUser = userMapper.findUserList();
		// 封裝分頁之後的數據
		PageInfo<User> pageInfoUser = new PageInfo<User>(listUser);
		return pageInfoUser;
	}

}

Controller層

@RestController
public class IndexController {
	@Autowired
	private UserService userService;

	@RequestMapping("/findUserList")
	public PageInfo<User> findUserList(int page, int size) {
		return userService.findUserList(page, size);
	}
}

啓動項目

@MapperScan("com.itmayiedu.mapper")
@SpringBootApplication
public class PageHelper {

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

}

springboot整合多數據源
application.properties配置文件：

###datasource1
spring.datasource.test1.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.test1.jdbc-url = jdbc:mysql://localhost:3306/test01?useUnicode=true&characterEncoding=utf-8
spring.datasource.test1.username = root
spring.datasource.test1.password = root
###datasource2
spring.datasource.test2.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.test2.jdbc-url = jdbc:mysql://localhost:3306/test02?useUnicode=true&characterEncoding=utf-8
spring.datasource.test2.username = root
spring.datasource.test2.password = root

配置兩個數據源

//DataSource01
@Configuration // 註冊到springboot容器中
@MapperScan(basePackages = "com.springboot.test01", sqlSessionFactoryRef = "test1SqlSessionFactory")
public class DataSource1Config {

	/**
	 * 
	 * @methodDesc: 功能描述:(配置test1數據庫)
	 * @param: @return
	 * @returnType:@return DataSource
	 */
	@Bean(name = "test1DataSource")
	@ConfigurationProperties(prefix = "spring.datasource.test1")
	@Primary
	public DataSource testDataSource() {
		return DataSourceBuilder.create().build();
	}

	/**
	 * 
	 * @methodDesc: 功能描述:(test1 sql會話工廠)
	 * @param: @parm
	 *             dataSource
	 * @param: @return
	 * @param: @throws
	 *             Exception
	 * @createTime:2017年9月17日 下午3:17:08
	 * @returnType:@param dataSource
	 * @returnType:@return
	 * @returnType:@throws Exception SqlSessionFactory
	 */
	@Bean(name = "test1SqlSessionFactory")
	@Primary
	public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
			throws Exception {
		SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
		bean.setDataSource(dataSource);
	}

	/**
	 * 
	 * @methodDesc: 功能描述:(test1 事物管理)

	 * @param: @param
	 *             dataSource
	 * @param: @return
	 * @param: @throws
	 *             Exception
	 * @returnType:@param dataSource
	 * @returnType:@return
	 * @returnType:@throws Exception SqlSessionFactory
	 */
	@Bean(name = "test1TransactionManager")
	@Primary
	public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
		return new DataSourceTransactionManager(dataSource);
	}
	@Bean(name = "test1SqlSessionTemplate")
	@Primary
	public SqlSessionTemplate testSqlSessionTemplate(
			@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
		return new SqlSessionTemplate(sqlSessionFactory);
	}

}

dataSource2

//DataSource2
@Configuration // 註冊到springboot容器中
@MapperScan(basePackages = "com.springboot.test02", sqlSessionFactoryRef = "test2SqlSessionFactory")
public class DataSource2Config {

	/**
	 * 
	 * @methodDesc: 功能描述:(配置test2數據庫)
	 * @param: @return
	 * @createTime:2017年9月17日 下午3:16:44
	 * @returnType:@return DataSource
	 */
	@Bean(name = "test2DataSource")
	@ConfigurationProperties(prefix = "spring.datasource.test2")
	public DataSource testDataSource() {
		return DataSourceBuilder.create().build();
	}

	/**
	 * 
	 * @methodDesc: 功能描述:(test2 sql會話工廠)
	 * @param: @param
	 *             dataSource
	 * @param: @return
	 * @param: @throws
	 *             Exception
	 * @createTime:2017年9月17日 下午3:17:08
	 * @returnType:@param dataSource
	 * @returnType:@return
	 * @returnType:@throws Exception SqlSessionFactory
	 */
	@Bean(name = "test2SqlSessionFactory")
	public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
			throws Exception {
		SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
		bean.setDataSource(dataSource);
	}

	/**
	 * 
	 * @methodDesc: 功能描述:(test2 事物管理)
	 * @param: @param
	 *             dataSource
	 * @param: @return
	 * @param: @throws
	 *             Exception
	 * @createTime:2017年9月17日 下午3:17:08
	 * @returnType:@param dataSource
	 * @returnType:@return
	 * @returnType:@throws Exception SqlSessionFactory
	 */
	@Bean(name = "test2TransactionManager")
	public DataSourceTransactionManager testTransactionManager(@Qualifier("test2DataSource") DataSource dataSource) {
		return new DataSourceTransactionManager(dataSource);
	}

	@Bean(name = "test2SqlSessionTemplate")
	public SqlSessionTemplate testSqlSessionTemplate(
			@Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
		return new SqlSessionTemplate(sqlSessionFactory);
	}

}

上面兩個配置數據源的文件沒有必要掌握，到時候拿來用即可。
創建分包Mapper

public interface User1Mapper {
	@Insert("insert into users values(null,#{name},#{age});")
	public int addUser(@Param("name") String name, @Param("age") Integer age);
}

public interface User2Mapper {
	@Insert("insert into users values(null,#{name},#{age});")
	public int addUser(@Param("name") String name, @Param("age") Integer age);
}

service層

@Service
@Slf4j
public class UserServiceTest01 {
	@Autowired
	private UserMapperTest01 userMapperTest01;

	@Transactional(transactionManager = "test1TransactionManager")
	public int insertUser(String name, Integer age) {
		int insertUserResult = userMapperTest01.insert(name, age);
		log.info("######insertUserResult:{}##########", insertUserResult);
		int i = 1 / age;
		// 怎麼樣驗證事務開啓成功!~
		return insertUserResult;
	}
}
//在多數據源的情況下，使用@Transactional註解時，應該指定事務管理者
//@Transactional(transactionManager = "test2TransactionManager")

controller層：

@RestController
public class MybatisMultilDataSourceController {
	@Autowired
	private UserServiceTest01 userServiceTest01;
	@Autowired
	private UserServiceTest02 userServiceTest02;

	@RequestMapping("/insertUserTest1")
	public Integer insertUserTest1(String name, Integer age) {
		return userServiceTest01.insertUser(name, age);
	}

	@RequestMapping("/insertUserTest2")
	public Integer insertUserTest2(String name, Integer age) {
		return userServiceTest02.insertUser(name, age);
	}
}

啓動項目：

@SpringBootApplication
@MapperScan(basePackages = { "com.springboot.mapper" })
public class App {
	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}
}