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<User,Long> {

  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<User> findAll();
  Page<User> findAll(Pageable pageable);
  List<User> findByName(String name);
  List<User> findBySex(String sex);
  List<User> 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<User> findAll() {
  List<User> l =userRepository.findAll();
  return l;
 } 

 @RequestMapping(value = "/findallByPage")
 public Page<User> findAllByPage() {
  Sort sort = new Sort(Sort.Direction.ASC,"id");
  Pageable pageable = new PageRequest(2,6,sort);
  Page<User> page = userRepository.findAll(pageable);
  return page;
 } 

 @RequestMapping(value = "/findByName")
 public List<User> findByName(@RequestParam String name) {
  List<User> list =userRepository.findByName(name);
  return list;
 } 

 @RequestMapping(value = "/findByAge")
 public List<User> findByAge(@RequestParam int age) {
  List<User> list =userRepository.findByAge(age);
  return list;
 } 

 @RequestMapping(value = "/findBySex")
 public List<User> findBySex(@RequestParam String sex) {
  List<User> 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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