小编给大家分享一下spring-data-jpa如何实现增删改查以及分页操作，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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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;
}
}看完了这篇文章，相信你对“spring-data-jpa如何实现增删改查以及分页操作”有了一定的了解，如果想了解更多相关知识，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
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