spring-data-jpa实现增删改查以及分页操作方法

有几个坑一定要注意：

实现删除操作的时候一定要在各层类中 增加

@Transactional

注释，否则会一直报错

在自己使用@Query定义操作时，会碰到编译器报错，这个时候只需要禁用QL的语法检查即可

以下是部分代码：

//Repository

package com.example.myproject.dao;
import com.example.myproject.domain.User;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import javax.transaction.Transactional;
import java.util.List;
/**
 * Created by lenovo on 2017/4/19.
 */
@Transactional
public interface UserRepository extends JpaRepository {

  void deleteById(int id);
  void deleteByName(String name);
  void deleteBySex(String sex);
  void deleteByAge(int age);
  void removeByNameAndAge(String name, int age);
  @Modifying
  @Query(value = "update user u set u.name = :newName where u.name = :oldName",nativeQuery = true)
  void updateNameByName(@Param("oldName") String oldName, @Param("newName") String newName);
  List findAll();
  Page findAll(Pageable pageable);
  List findByName(String name);
  List findBySex(String sex);
  List findByAge(int age);
  User findByNameAndSex(String name, String sex);
}

//Controller

package com.example.myproject.web; 
 
import com.example.myproject.dao.UserRepository; 
import com.example.myproject.domain.User; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.data.domain.Page; 
import org.springframework.data.domain.PageRequest; 
import org.springframework.data.domain.Pageable; 
import org.springframework.data.domain.Sort; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RequestParam; 
import org.springframework.web.bind.annotation.RestController; 
 
import javax.transaction.Transactional; 
import java.util.List; 
 
/** 
 * Created by lenovo on 2017/4/19. 
 */ 
@RestController 
@RequestMapping("/") 
@Transactional 
public class UserController { 
 @Autowired 
 private UserRepository userRepository; 
 
 @RequestMapping(value = "/userSave") 
 public String userSave(@RequestParam String name,@RequestParam String sex,@RequestParam int age) { 
  User user = new User(); 
  user.setName(name); 
  user.setAge(age); 
  user.setSex(sex); 
  userRepository.save(user); 
  return "true"; 
 } 
 
 @RequestMapping(value = "/deleteById") 
 public String deleteById(@RequestParam int id) { 
  userRepository.deleteById(id); 
  return "success"; 
 } 
 
 @RequestMapping(value = "/deleteByName") 
 public String deleteByName(@RequestParam String name) { 
  userRepository.deleteByName(name); 
  return "success"; 
 } 
 
 @RequestMapping(value = "/deleteBySex") 
 public String deleteBySex(@RequestParam String sex) { 
  userRepository.deleteBySex(sex); 
  return "success"; 
 } 
 
 @RequestMapping(value = "/deleteByAge") 
 public String deleteByAge(@RequestParam int age) { 
  userRepository.deleteByAge(age); 
  return "success"; 
 } 
 
 @RequestMapping(value = "/deleteByNameAndAge") 
 public String deleteByNameAndAge(@RequestParam String name, @RequestParam int age) { 
  userRepository.removeByNameAndAge(name,age); 
  return "success"; 
 } 
 
 @RequestMapping(value = "/updateNameByName") 
 public String updateNameByName(@RequestParam String oldName, @RequestParam String newName) { 
  userRepository.updateNameByName(oldName,newName); 
  return "success"; 
 } 
 
 @RequestMapping(value = "/findall") 
 public List findAll() { 
  List l =userRepository.findAll(); 
  return l; 
 } 
 
 @RequestMapping(value = "/findallByPage") 
 public Page findAllByPage() { 
  Sort sort = new Sort(Sort.Direction.ASC,"id"); 
  Pageable pageable = new PageRequest(2,6,sort); 
  Page page = userRepository.findAll(pageable); 
  return page; 
 } 
 
 @RequestMapping(value = "/findByName") 
 public List findByName(@RequestParam String name) { 
  List list =userRepository.findByName(name); 
  return list; 
 } 
 
 @RequestMapping(value = "/findByAge") 
 public List findByAge(@RequestParam int age) { 
  List list =userRepository.findByAge(age); 
  return list; 
 } 
 
 @RequestMapping(value = "/findBySex") 
 public List findBySex(@RequestParam String sex) { 
  List list =userRepository.findBySex(sex); 
  return list; 
 } 
 
 @RequestMapping(value = "/findByNameAndSex") 
 public User findByNameAndSex(@RequestParam String name, @RequestParam String sex) { 
  User list =userRepository.findByNameAndSex(name,sex); 
  return list; 
 } 
} 

//User

package com.example.myproject.domain;
import javax.persistence.*;
/**
 * Created by lenovo on 2017/4/19.
 */
@Entity
public class User {
 @Id
 @GeneratedValue()
 private Integer id;
 @Column
 private String name;
 @Column
 private String sex;
 @Column
 private int age;
 public Integer getId() {
  return id;
 }
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public String getSex() {
  return sex;
 }
 public void setSex(String sex) {
  this.sex = sex;
 }
 public int getAge() {
  return age;
 }
 public void setAge(int age) {
  this.age = age;
 }
}

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