1.pom ajoute des dépendances
<!-- spring data jpa,会注入tomcat jdbc pool/hibernate等 --> org.springframework.bootspring-boot-starter-data-jpamysqlmysql-connector-java5.1.42
2. Ajoutez la configuration de la source de données (DataSource ou quelque chose du genre, une série d'objets que Spring Boot injectera pour vous. , configurez la configuration ! )
spring.datasource.url=jdbc:mysql:spring.datasource.username==123456--name=-wait=10000-active=300-on-borrow=-size=20
#=====================jpa config================================ #实体类维护数据库表结构的具体行为:update/create/create-drop/validate/none spring.jpa.hibernate.ddl-auto=none #打印sql语句 spring.jpa.show-sql=true #格式化输出的json字符串 spring.jackson.serialization.indent_output=true
3. Créer une nouvelle entité
@Entity @Table(name="user")public class User { @Id @Column(name="id") @GeneratedValue(strategy = GenerationType.IDENTITY)private Integer id; @Column(name="number")private String number; @Column(name="name")private String name;public Integer getId() {return id; }public void setId(Integer id) {this.id = id; }public String getNumber() {return number; }public void setNumber(String number) {this.number = number; }public String getName() {return name; }public void setName(String name) {this.name = name; } }
Couche 4.dao
public interface UserDao{ User getById(int id); User getByNumber(String number);int addUser(User user);void deleteUserById(int id); User updateUser(User user); }
@Repositorypublic class UserDaoImpl implements UserDao { @PersistenceContextprivate EntityManager entityManager; @Overridepublic User getById(int id) {//find by primary keyreturn this.entityManager.find(User.class,id); } @Overridepublic User getByNumber(String number) { Query query = this.entityManager.createQuery("from User u where u.number=:number",User.class); query.setParameter("number",number); User user = (User)query.getSingleResult();return user; } @Overridepublic int addUser(User user) {this.entityManager.persist(user);//print the id System.out.println(user.getId());return user.getId(); } @Overridepublic void deleteUserById(int id) { User user = this.entityManager.find(User.class,id); //关联到记录,方可删除this.entityManager.remove(user); } @Overridepublic User updateUser(User user) { User userNew = this.entityManager.merge(user);return userNew; } }
5.service couche
public interface UserService { User getById(int id); User getByNumber(String number);int addUser(User user,boolean throwEx);void deleteUserById(int id); User updateUser(User user); }
@Service @Transactionalpublic class UserServiceImpl implements UserService { @Autowiredprivate UserDao userDao; @Override @Transactional(readOnly = true)public User getById(int id) {return userDao.getById(id); } @Override @Transactional(readOnly = true)public User getByNumber(String number) {return userDao.getByNumber(number); } @Overridepublic int addUser(User user,boolean throwEx) {int id= this.userDao.addUser(user);if(throwEx){throw new RuntimeException("throw a ex"); }return id; } @Overridepublic void deleteUserById(int id) {this.userDao.deleteUserById(id); } @Overridepublic User updateUser(User user) {return this.userDao.updateUser(user); } }
6.couche de contrôleur
@Controller("user1") @RequestMapping("/jpa/user")public class UserController {/** * 日志(slf4j->logback) */private static final Logger logger = LoggerFactory.getLogger(UserController.class); @Autowiredprivate UserService userService;/** * 返回text格式数据 * @param id 主键id * @return 用户json字符串 */@RequestMapping("/get/id/{id}") @ResponseBodypublic String getUserById(@PathVariable("id")String id){ logger.info("request /user/get/id/{id}, parameter is "+id); User user = userService.getById(Integer.parseInt(id));return JSONObject.toJSONString(user); }/** * 返回json格式数据 * @param number 编号 * @return 用户 */@RequestMapping("/get/number/{number}") @ResponseBodypublic User getUserByNumber(@PathVariable("number")String number){ User user = userService.getByNumber(number);return user; } @RequestMapping("/add/{number}/{name}") @ResponseBodypublic String addUser(@PathVariable("number")String number,@PathVariable("name")String name,boolean throwEx){ User user = new User(); user.setNumber(number); user.setName(name);int id = -1;try{ id = userService.addUser(user,throwEx); }catch (RuntimeException ex){ System.out.println(ex.getMessage()); }return String.valueOf(id); } @RequestMapping("/delete/{id}") @ResponseBodypublic void getUserById(@PathVariable("id")int id){this.userService.deleteUserById(id); } @RequestMapping("/update/{id}/{number}/{name}") @ResponseBodypublic User addUser(@PathVariable("id")int id, @PathVariable("number")String number, @PathVariable("name")String name){ User user = new User(); user.setId(id); user.setNumber(number); user.setName(name);return userService.updateUser(user); } }
7. Nouvelle façon d'utiliser Spring Data jpa, plus avancée
1.dao @Repositorypublic interface UserRepository extends JpaRepository<User, Integer> {/** * spring data jpa 会自动注入实现(根据方法命名规范) * @return */User findByNumber(String number); @Modifying @Query("delete from User u where u.id = :id")void deleteUser(@Param("id")int id); }2.servicepublic interface UserService { User findById(int id); User findByNumber(String number); List<User> findAllUserByPage(int page,int size); User updateUser(User user,boolean throwEx);void deleteUser(int id); } @Service @Transactionalpublic class UserServiceImpl implements UserService { @Autowiredprivate UserRepository userRepository; @Overridepublic User findById(int id) {return this.userRepository.findOne(id); } @Overridepublic User findByNumber(String number) {return this.userRepository.findByNumber(number); } @Overridepublic List<User> findAllUserByPage(int page,int size) { Pageable pageable = new PageRequest(page, size); Page<User> users = this.userRepository.findAll(pageable);return users.getContent(); } @Overridepublic User updateUser(User user,boolean throwEx) { User userNew = this.userRepository.save(user);if(throwEx){throw new RuntimeException("throw a ex"); }return userNew; } @Overridepublic void deleteUser(int id) {this.userRepository.deleteUser(id); } }3.controller @Controller("user2") @RequestMapping("/datajpa/user")public class UserController {/** * 日志(slf4j->logback) */private static final Logger logger = LoggerFactory.getLogger(UserController.class); @Autowiredprivate UserService userService;/** * 返回text格式数据 * @param id 主键id * @return 用户json字符串 */@RequestMapping("/get/id/{id}") @ResponseBodypublic String getUserById(@PathVariable("id")String id){ logger.info("request /user/get/id/{id}, parameter is "+id); User user = userService.findById(Integer.parseInt(id));return JSONObject.toJSONString(user); }/** * 返回json格式数据 * @param number 编号 * @return 用户 */@RequestMapping("/get/number/{number}") @ResponseBodypublic User getUserByNumber(@PathVariable("number")String number){ User user = userService.findByNumber(number);return user; } @RequestMapping("/get/all/{page}/{size}") @ResponseBodypublic List<User> getAllUserByPage(@PathVariable("page")int page,@PathVariable("size")int size){return this.userService.findAllUserByPage(page,size); } @RequestMapping("/update/{id}/{number}/{name}") @ResponseBodypublic User addUser(@PathVariable("id")int id, @PathVariable("number")String number, @PathVariable("name")String name,boolean throwEx){ User user = new User(); user.setId(id); user.setNumber(number); user.setName(name); User userNew = null;try{ userService.updateUser(user,throwEx); }catch (RuntimeException ex){ System.out.println(ex.getMessage()); }return userNew; } @RequestMapping("/delete/{id}") @ResponseBodypublic void getUserById(@PathVariable("id")int id){this.userService.deleteUser(id); } }
8 .Injectez jdbcTemplate et transactionTemplate, et utilisez la méthode traditionnelle pour faire fonctionner la base de données, qui est plus flexible. La méthode est la suivante
@Autowiredprivate JdbcTemplate jdbcTemplate; @Autowiredprivate TransactionTemplate transactionTemplate;/** * 手动控制事物测试 * @param throwEx */@Overridepublic void testTransactionManually(boolean throwEx) {try { transactionTemplate.execute(new TransactionCallback<Boolean>() {/** * 事物代码 * * @param transactionStatus 事物状态 * @return 是否成功 */@Overridepublic Boolean doInTransaction(TransactionStatus transactionStatus) { User user = new User(); user.setId(1);int a = new Random().nextInt(10); //0-9user.setNumber("10000u" + a); jdbcTemplate.update("UPDATE USER SET NUMBER=? WHERE ID=?", new Object[]{user.getNumber(), user.getId()}, new int[]{Types.VARCHAR, Types.INTEGER});if (throwEx) {throw new RuntimeException("try throw exception"); //看看会不会回滚 }return true; } }); }catch (RuntimeException ex){ System.out.println(ex.getMessage()); } }/** * 手动执行jdbc测试 */@Overridepublic void testJdbcTemplate() { User user = new User();int a = new Random().nextInt(10); //0-9user.setNumber("10000i"+ a ); user.setName("name"+a);this.jdbcTemplate.update("INSERT into USER(NUMBER,NAME )VALUES (?,?)",user.getNumber(),user.getName()); }
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Jusqu'à présent, je l'ai dit. Il existe trois façons (jpa deux + jdbcTemplate) de faire fonctionner la base de données. Vous pouvez l'utiliser comme bon vous semble. Les codes ci-dessus sont tous prouvés réalisables dans la pratique !Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!