1.pom添加依赖
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<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version> 5.1 . 42 </version> </dependency> |
2.添加数据源配置(DataSource啥的,一系列对象spring boot 都会给你注入的,配置配置即可!)
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spring.datasource.url=jdbc:mysql: //localhost/test?characterEncoding=utf8&useSSL=true spring.datasource.username=root spring.datasource.password= 123456 spring.datasource.driver- class -name=com.mysql.jdbc.Driver #database pool config # Number of ms to wait before throwing an exception if no connection is available. spring.datasource.tomcat.max-wait= 10000 # Maximum number of active connections that can be allocated from this pool at the same time. spring.datasource.tomcat.max-active= 300 # Validate the connection before borrowing it from the pool. spring.datasource.tomcat.test-on-borrow= true # initial pool size spring.datasource.tomcat.initial-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.新建实体
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@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; } } |
4.dao层
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public interface UserDao{ User getById( int id); User getByNumber(String number); int addUser(User user); void deleteUserById( int id); User updateUser(User user); } |
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@Repository public class UserDaoImpl implements UserDao { @PersistenceContext private EntityManager entityManager; @Override public User getById( int id) { //find by primary key return this .entityManager.find(User. class ,id); } @Override public 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; } @Override public int addUser(User user) { this .entityManager.persist(user); //print the id System.out.println(user.getId()); return user.getId(); } @Override public 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); } @Override public User updateUser(User user) { User userNew = this .entityManager.merge(user); return userNew; } } |
5.service层
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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); } |
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@Service @Transactional public class UserServiceImpl implements UserService { @Autowired private 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); } @Override public int addUser(User user, boolean throwEx) { int id= this .userDao.addUser(user); if (throwEx){ throw new RuntimeException( "throw a ex" ); } return id; } @Override public void deleteUserById( int id) { this .userDao.deleteUserById(id); } @Override public User updateUser(User user) { return this .userDao.updateUser(user); } } |
6.controller层
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@Controller ( "user1" ) @RequestMapping ( "/jpa/user" ) public class UserController { /** * 日志(slf4j->logback) */ private static final Logger logger = LoggerFactory.getLogger(UserController. class ); @Autowired private 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}" ) @ResponseBody public 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}" ) @ResponseBody public User getUserByNumber( @PathVariable ( "number" )String number){ User user = userService.getByNumber(number); return user; } @RequestMapping ( "/add/{number}/{name}" ) @ResponseBody public 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}" ) @ResponseBody public void getUserById( @PathVariable ( "id" ) int id){ this .userService.deleteUserById(id); } @RequestMapping ( "/update/{id}/{number}/{name}" ) @ResponseBody public 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. spring data jpa新使用方式,更高级
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1 .dao @Repository public 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 .service public 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 @Transactional public class UserServiceImpl implements UserService { @Autowired private UserRepository userRepository; @Override public User findById( int id) { return this .userRepository.findOne(id); } @Override public User findByNumber(String number) { return this .userRepository.findByNumber(number); } @Override public List<User> findAllUserByPage( int page, int size) { Pageable pageable = new PageRequest(page, size); Page<User> users = this .userRepository.findAll(pageable); return users.getContent(); } @Override public User updateUser(User user, boolean throwEx) { User userNew = this .userRepository.save(user); if (throwEx){ throw new RuntimeException( "throw a ex" ); } return userNew; } @Override public 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 ); @Autowired private 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}" ) @ResponseBody public 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}" ) @ResponseBody public User getUserByNumber( @PathVariable ( "number" )String number){ User user = userService.findByNumber(number); return user; } @RequestMapping ( "/get/all/{page}/{size}" ) @ResponseBody public List<User> getAllUserByPage( @PathVariable ( "page" ) int page, @PathVariable ( "size" ) int size){ return this .userService.findAllUserByPage(page,size); } @RequestMapping ( "/update/{id}/{number}/{name}" ) @ResponseBody public 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}" ) @ResponseBody public void getUserById( @PathVariable ( "id" ) int id){ this .userService.deleteUser(id); } } |
8.注入jdbcTemplate和transactionTemplate,使用传统方式操作数据库,更加灵活,方法如下
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@Autowired private JdbcTemplate jdbcTemplate; @Autowired private TransactionTemplate transactionTemplate; /** * 手动控制事物测试 * @param throwEx */ @Override public 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 */ @Override public Boolean doInTransaction(TransactionStatus transactionStatus) { User user = new User(); user.setId( 1 ); int a = new Random().nextInt( 10 ); //0-9 user.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 */ @Override public void testJdbcTemplate() { User user = new User(); int a = new Random().nextInt( 10 ); //0-9 user.setNumber( "10000i" + a ); user.setName( "name" +a); this .jdbcTemplate.update( "INSERT into USER(NUMBER,NAME )VALUES (?,?)" ,user.getNumber(),user.getName()); } |
至此,我已经讲了三种方式(jpa两种+jdbcTemplate)如何操作数据库了,你爱怎么用就怎么用,上述代码均是实践证明可行的!
以上这篇基于spring boot 1.5.4 集成 jpa+hibernate+jdbcTemplate(详解)就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。