Springboot入门之数据访问层
一、Springboot整合使用jdbcTemplete
1.pom文件引入
org.springframework.boot
spring-boot-starter-parent
1.5.2.RELEASE
org.springframework.boot
spring-boot-starter-jdbc
mysql
mysql-connector-java
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-starter-web
2.配置application.properties（我的数据库没密码，你的加上就行）
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
#spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver3.编写一个service接口和实现类
public interface UserService {
public void insertJdbcUser();
}@Service
public class UserServiceImpl implements UserService{
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public void insertJdbcUser() {
jdbcTemplate.update("insert into user values(null,?,?);","lisi",19);
}
}4.编写一个controller及启动类
@RestController
public class IndexController {
@Autowired
private UserService userService;
@RequestMapping("/index")
public String index(){
userService.insertJdbcUser();
return "success";
}
}@ComponentScan(basePackages = { "cn.iponkan.controller", "cn.iponkan.service" })
@EnableAutoConfiguration
public class SpringBootApplication {
public static void main(String[] args){
SpringApplication.run(SpringBootApplication.class,args);
}
}
二、Springboot整合使用mybatis
1.pom文件引入
org.springframework.boot
spring-boot-starter-parent
1.5.2.RELEASE
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-tomcat
org.apache.tomcat.embed
tomcat-embed-jasper
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.1.1
mysql
mysql-connector-java
2.配置application.properties（我的数据库没密码，你的加上就行）
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
#spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driverpublic class User {
private Integer id;
private String name;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}public interface UserMapper
{
@Select("select * from user where name =#{name}")
User getName(@Param("name")String name);
}4.编写Controller及启动类
@Controller
public class Indexcontroller {
@Autowired
private UserMapper userMapper;
@RequestMapping("/index")
public String index(){
return "index";
}
@ResponseBody
@RequestMapping("/getName")
public User getName(String name){
return userMapper.getName(name);
}
}@ComponentScan(basePackages = { "cn.iponkan.controller"})
@MapperScan(basePackages = {"cn.iponkan.mapper"})
@EnableAutoConfiguration
public class SpringBootApplication {
public static void main(String[] args){
SpringApplication.run(SpringBootApplication.class,args);
}
}三、Springboot整合使用jpa
1.pom文件引入
org.springframework.boot
spring-boot-starter-parent
1.5.2.RELEASE
org.springframework.boot
spring-boot-starter-data-jpa
mysql
mysql-connector-java
org.springframework.boot
spring-boot-starter-web
2.配置application.properties（我的数据库没密码，你的加上就行）
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
#spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver3.创建实体类和Dao
@Entity(name = "user")
public class User {
@Id
@GeneratedValue
private Integer id;
@Column
private String name;
@Column
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
'}';
}
}public interface UserRepository extends JpaRepository {
} 4.编写Controller及启动类
@RestController
public class IndexController {
@Autowired
private UserRepository userRepository;
@RequestMapping("/index")
public String index(Integer id){
User u= userRepository.findOne(id);
return u.toString();
}
}@ComponentScan(basePackages = { "cn.iponkan.controller" })
@EnableJpaRepositories(basePackages = {"cn.iponkan.repository"})
@EntityScan(basePackages = {"cn.iponkan.entity"})
@EnableAutoConfiguration
public class SpringbootApp {
public static void main(String[] args) {
SpringApplication.run(SpringbootApp.class,args);
}
}
四、Springboot整合多数据源
1.pom文件
org.springframework.boot
spring-boot-starter-parent
1.5.2.RELEASE
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-tomcat
org.apache.tomcat.embed
tomcat-embed-jasper
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.1.1
mysql
mysql-connector-java
2.application.properties
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 = root3.新增两个数据源类
@Configuration// 注入到springboot容器中
@MapperScan(basePackages = "cn.iponkan.test01", sqlSessionFactoryRef = "test1SqlSessionFactory")
public class Datasource1 {
@Bean(name = "test1DataSource")
@ConfigurationProperties(prefix = "spring.datasource.test1")
@Primary
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
@MapperScan(basePackages="cn.iponkan.test02",sqlSessionFactoryRef="test2SqlSessionFactory")
public class Datasource2 {
@Bean(name = "test2DataSource")
@ConfigurationProperties(prefix = "spring.datasource.test2")
public DataSource testDataSource() {
return DataSourceBuilder.create().build();
}
@Bean(name = "test2SqlSessionFactory")
public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
// bean.setMapperLocations(
// new PathMatchingResourcePatternResolver().getResources("classpath:mybatis/mapper/test2/*.xml"));
return bean.getObject();
}
@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);
}
}4.分包创建实体类、Mapper和service
public class User {
private Integer id;
private String name;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}@CacheConfig(cacheNames = "baseCache")
public interface User1Mapper {
@Insert("insert into user values(null,#{name},#{age});")
public int addUser(@Param("name") String name, @Param("age") Integer age);
}@Service
public class User01Service {
@Autowired
private User1Mapper user1Mapper;
public int addUser(String name, Integer age) {
return user1Mapper.addUser(name, age);
}
}5.同第四步创建另一个包，注意相应的1改为2
6.写Controller类和启动类
@RestController
public class Indexcontroller {
@Autowired
private User1Mapper user1Mapper;
@Autowired
private User2Mapper user2Mapper;
@RequestMapping("/add")
public String add() {
user1Mapper.addUser("Tung", 22);
user2Mapper.addUser("Clare", 22);
return "成功！";
}
}@ComponentScan(basePackages = { "cn.iponkan.controller","cn.iponkan.datasource","cn.iponkan.test01","cn.iponkan.test02"})
@EnableAutoConfiguration
public class SpringBootApplication {
public static void main(String[] args){
SpringApplication.run(SpringBootApplication.class,args);
}
}源代码见GitHub：https://github.com/tangqiangDong/Springboot点击打开链接