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SpringBoot 数据访问
1.springboot整合使用JdbcTemplate
1.1 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 依赖 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- mysql 依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- 测试 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- springboot-web组件 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
1.2 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
1.3编写一个测试类
@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);
}
}
@SpringBootApplication
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
注意: spring-boot-starter-parent要在1.5以上
2.springboot整合使用mybatis
2.1 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>
<!-- 测试 -->
<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 依赖 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- springboot-web组件 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
2.2 配置文件引入
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
2.3 Mapper代码
public interface UserMapper {
@Select("SELECT * FROM USERS WHERE NAME = #{name}")
User findByName(@Param("name") String name);
@Insert("INSERT INTO USERS(NAME, AGE) VALUES(#{name}, #{age})")
int insert(@Param("name") String name, @Param("age") Integer age);
}
2.4 启动方式
@MapperScan("com.itma.mapper")
@SpringBootApplication
public class MybatisApp {
public static void main(String[] args) {
SpringApplication.run(MybatisApp.class, args);
}
}
3.springboot整合使用springjpa
3.1 pom文件引入依赖
<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-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
3.2 创建User实体类
@Entity(name = "users")
public class User {
@Id
@GeneratedValue
private Integer id;
@Column(name = "name")
private String name;
@Column(name = "age")
private Integer age;
// get set
}
3.3 创建UserDao
public interface UserDao extends JpaRepository<User, Integer> {
}
3.4 创建IndexController
@RestController
public class IndexController {
@Autowired
private UserDao userDao;
@RequestMapping("/jpaFindUser")
public Object jpaIndex(User user) {
Optional<User> userOptional = userDao.findById(user.getId());
User reusltUser = userOptional.get();
return reusltUser == null ? "没有查询到数据" : reusltUser;
}
}
3.5 启动项目
EnableJpaRepositories("com.itma.dao")
@EntityScan(basePackages = "com.itma.entity")
@SpringBootApplication
public class JpaApp {
public static void main(String[] args) {
SpringApplication.run(JpaApp.class, args);
}
}
4.springboot整合多数据源
4.1 配置文件中新增两个数据源
spring.datasource.test1.driverClassName = com.mysql.jdbc.Driver
spring.datasource.test1.url = jdbc:mysql://localhost:3306/test01?useUnicode=true&characterEncoding=utf-8
spring.datasource.test1.username = root
spring.datasource.test1.password = root
spring.datasource.test2.driverClassName = com.mysql.jdbc.Driver
spring.datasource.test2.url = jdbc:mysql://localhost:3306/test02?useUnicode=true&characterEncoding=utf-8
spring.datasource.test2.username = root
spring.datasource.test2.password = root
4.2 配置文件中新增两个数据源
@Configuration // 注册到springboot容器中
@MapperScan(basePackages = "com.itma.user1", sqlSessionFactoryRef = "test1SqlSessionFactory")
public class DataSource1Config {
@Bean(name = "test1DataSource")
@Primary
@ConfigurationProperties(prefix = "spring.datasource.test1")
public DataSource testDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "test1SqlSessionFactory")
@Primary
public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
// bean.setMapperLocations(
// new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
return bean.getObject();
}
@Bean(name = "test1TransactionManager")
@Primary
public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "test1SqlSessionTemplate")
public SqlSessionTemplate testSqlSessionTemplate(
@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
@Configuration // 注册到springboot容器中
@MapperScan(basePackages = "com.itma.user1", sqlSessionFactoryRef = "test1SqlSessionFactory")
public class DataSource1Config {
@Bean(name = "test1DataSource")
@Primary
@ConfigurationProperties(prefix = "spring.datasource.test1")
public DataSource testDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "test1SqlSessionFactory")
@Primary
public SqlSessionFactory testSqlSessionFactory(@Qualifier("test1DataSource") DataSource dataSource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
// bean.setMapperLocations(
// new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test1/*.xml"));
return bean.getObject();
}
@Bean(name = "test1TransactionManager")
@Primary
public DataSourceTransactionManager testTransactionManager(@Qualifier("test1DataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "test1SqlSessionTemplate")
public SqlSessionTemplate testSqlSessionTemplate(
@Qualifier("test1SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
}
4.3 创建分包Mapper
public interface User1Mapper {
@Insert("insert into users values(null,#{name},#{age});")
public int addUser(@Param("name") String name, @Param("age") Integer age);
}
4.4 启动项目
@ComponentScan(basePackages = "com.itma")
@EnableAutoConfiguration
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}