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1.pom添加依賴
<!-- spring data jpa,會注入tomcat jdbc pool/hibernate等 -->
<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.添加數據源配置（DataSource啥的，一系列對象spring boot 都會給你注入的，配置配置即可！）
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================================ #實體類維護數據庫表結構的具體行為：update/create/create-drop/validate/none spring.jpa.hibernate.ddl-auto=none #打印sql語句 spring.jpa.show-sql=true #格式化輸出的json字符串 spring.jackson.serialization.indent_output=true
3.新建實體
@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層
public interface UserDao{
User getById(int id);
User getByNumber(String number);
int addUser(User user);
void deleteUserById(int id);
User updateUser(User user);
}
@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); //關聯到記錄，方可刪除
this.entityManager.remove(user);
}
@Override
public User updateUser(User user) {
User userNew = this.entityManager.merge(user);
return userNew;
}
}
5.service層
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
@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層
@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格式數據
* @param id 主鍵id
* @return 用戶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格式數據
* @param number 編號
* @return 用戶
*/
@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，更高級
1.dao
@Repository
public interface UserRepository extends JpaRepository<User, Integer> {
/**
* spring data jpa 會自動注入實現（根據方法命名規范）
* @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格式數據
* @param id 主鍵id
* @return 用戶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格式數據
* @param number 編號
* @return 用戶
*/
@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,使用傳統方式操作數據庫，更加靈活，方法如下
@Autowired
private JdbcTemplate jdbcTemplate;
@Autowired
private TransactionTemplate transactionTemplate;
/**
* 手動控制事物測試
* @param throwEx
*/
@Override
public void testTransactionManually(boolean throwEx) {
try {
transactionTemplate.execute(new TransactionCallback<Boolean>() {
/**
* 事物代碼
*
* @param transactionStatus 事物狀態
* @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"); //看看會不會回滾
}
return true;
}
});
}catch (RuntimeException ex){
System.out.println(ex.getMessage());
}
}
/**
* 手動執行jdbc測試
*/
@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，我已經講了三種方式（jpa兩種+jdbcTemplate）如何操作數據庫了，你愛怎么用就怎么用，上述代碼均是實踐證明可行的！
以上這篇基于spring boot 1.5.4 集成 jpa+hibernate+jdbcTemplate(詳解)就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持億速云。
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