十四、spring boot 2.x 整合 jpa 進階
阿新 • • 發佈：2018-12-18
本文主要針對jpa常見的用法進行演示講解，主要包括JPA常見的查詢、分頁查詢、HQL操作、SQL操作等幾個方面。
1、JPA支援的常用的查詢
/** * And查詢 等價於SQL中的and<br> */ List<UserEntity> findByNameAndAge(String name, Integer age); /** * Or查詢 等價於SQL中的or<br> */ List<UserEntity> findByNameOrAge(String name, Integer age); /** * Between查詢 等價於SQL中的between<br> */ public List<UserEntity> findByAgeBetween(int min,int max); /** * LessThan查詢 等價於SQL中的 "<"<br> */ public List<UserEntity> findByAgeLessThan(int max); /** * GreaterThan查詢 等價於SQL中的">"<br> */ public List<UserEntity> findByAgeGreaterThan(int min); /** * IsNull查詢 等價於SQL中的 "is null"<br> */ public List<UserEntity> findByNameIsNull(); /** * IsNotNull查詢 等價於SQL中的 "is not null"<br> */ public List<UserEntity> findByNameIsNotNull(); /** * NotNull查詢 與IsNotNull等價； */ public List<UserEntity> findByNameNotNull(); /** * Like查詢 等價於SQL中的 "like"; */ public List<UserEntity> findByNameLike(String name); /** * NotLike查詢 等價於SQL中的 "not like" */ public List<UserEntity> findByNameNotLike(String name); /** * OrderBy查詢 等價於SQL中的 "order by" */ public List<UserEntity> findByNameNotNullOrderByAgeAsc(); /** * Not查詢 等價於SQL中的 "！ =" */ public List<UserEntity> findByNameNot(String name); /** * In查詢 等價於SQL中的 "in"; */ public List<UserEntity> findByNameIn(String name); /** * NotIn查詢 等價於SQL中的 "not in" */ public List<UserEntity> findByNameNotIn(String name);
2、JPA的分頁查詢
/**
* 分頁查詢
*/
Page<UserEntity> findByNameLike(String name,Pageable pageable);3、HQL操作
/** * HQL語句查詢<br> */ @Query("select u from UserEntity u where u.name = ?1 and u.age = ?2") List<UserEntity> findByHql(String user, Integer age); /** * HQL語句刪除 */ @Query(value = "delete from UserEntity u where u.id=?1 ") @Modifying @Transactional public void deleteByHql(Integer id); /** * HQL修改 */ @Transactional @Query(value = "update UserEntity u set u.name=?1 where u.id=?2 ") @Modifying public void updateByHql(String name,int id);
4、SQL操作
/** * 原生SQL進行查詢<br> */ @Query(value = "select u.* from user u where u.name = ?1 and u.age = ?2", nativeQuery = true) public List<UserEntity> findBySql(String name, Integer age); /** * 原生的SQL刪除 */ @Transactional @Query(value = "delete from user where id=?1", nativeQuery = true) @Modifying public void deleteBySql(int id); /** * 原生的SQL修改 */ @Query(value = "update user set name=?1 where id=?2", nativeQuery = true) @Modifying @Transactional public void updateBySql(String name,int id); /** * 原生的SQL插入 */ @Query(value = "insert into user(name,age) value(?1,?2)", nativeQuery = true) @Modifying @Transactional public void insertBySql(String name,int age);
5、完整程式碼
UserEntity.java
package com.ldy.bootv2.demo.entity;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
@Entity
@ApiModel
@Table(name="user")
@JsonIgnoreProperties(value={"hibernateLazyInitializer","handler"})
public class UserEntity implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue
@ApiModelProperty(value="id，新建時不傳，修改時傳")
private Integer id;
@Column
@ApiModelProperty(value="名稱")
private String name;
@Column
@ApiModelProperty(value="年齡")
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
UserDao.java
package com.ldy.bootv2.demo.dao;
import java.util.List;
import javax.transaction.Transactional;
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 com.ldy.bootv2.demo.entity.UserEntity;
public interface UserDao extends JpaRepository<UserEntity, Integer> {
/******************** 1、支援根據方法名自動適配查詢的介面示例 *********************/
/**
* And查詢 等價於SQL中的and<br>
*/
List<UserEntity> findByNameAndAge(String name, Integer age);
/**
* Or查詢 等價於SQL中的or<br>
*/
List<UserEntity> findByNameOrAge(String name, Integer age);
/**
* Between查詢 等價於SQL中的between<br>
*/
public List<UserEntity> findByAgeBetween(int min,int max);
/**
* LessThan查詢 等價於SQL中的 "<"<br>
*/
public List<UserEntity> findByAgeLessThan(int max);
/**
* GreaterThan查詢 等價於SQL中的">"<br>
*/
public List<UserEntity> findByAgeGreaterThan(int min);
/**
* IsNull查詢 等價於SQL中的 "is null"<br>
*/
public List<UserEntity> findByNameIsNull();
/**
* IsNotNull查詢 等價於SQL中的 "is not null"<br>
*/
public List<UserEntity> findByNameIsNotNull();
/**
* NotNull查詢 與IsNotNull等價；
*/
public List<UserEntity> findByNameNotNull();
/**
* Like查詢 等價於SQL中的 "like";
*/
public List<UserEntity> findByNameLike(String name);
/**
* NotLike查詢 等價於SQL中的 "not like"
*/
public List<UserEntity> findByNameNotLike(String name);
/**
* OrderBy查詢 等價於SQL中的 "order by"
*/
public List<UserEntity> findByNameNotNullOrderByAgeAsc();
/**
* Not查詢 等價於SQL中的 "！ ="
*/
public List<UserEntity> findByNameNot(String name);
/**
* In查詢 等價於SQL中的 "in";
*/
public List<UserEntity> findByNameIn(String name);
/**
* NotIn查詢 等價於SQL中的 "not in"
*/
public List<UserEntity> findByNameNotIn(String name);
/**
* 分頁查詢
*/
Page<UserEntity> findByNameLike(String name,Pageable pageable);
/******************** 2、支援HQL語句進行操作介面示例 *********************/
/**
* HQL語句查詢<br>
*/
@Query("select u from UserEntity u where u.name = ?1 and u.age = ?2")
List<UserEntity> findByHql(String user, Integer age);
/**
* HQL語句刪除
*/
@Query(value = "delete from UserEntity u where u.id=?1 ")
@Modifying
@Transactional
public void deleteByHql(Integer id);
/**
* HQL修改
*/
@Transactional
@Query(value = "update UserEntity u set u.name=?1 where u.id=?2 ")
@Modifying
public void updateByHql(String name,int id);
/******************** 3、支援原生SQL語句進行操作介面示例 *********************/
/**
* 原生SQL進行查詢<br>
*/
@Query(value = "select u.* from user u where u.name = ?1 and u.age = ?2", nativeQuery = true)
public List<UserEntity> findBySql(String name, Integer age);
/**
* 原生的SQL刪除
*/
@Transactional
@Query(value = "delete from user where id=?1", nativeQuery = true)
@Modifying
public void deleteBySql(int id);
/**
* 原生的SQL修改
*/
@Query(value = "update user set name=?1 where id=?2", nativeQuery = true)
@Modifying
@Transactional
public void updateBySql(String name,int id);
/**
* 原生的SQL插入
*/
@Query(value = "insert into user(name,age) value(?1,?2)", nativeQuery = true)
@Modifying
@Transactional
public void insertBySql(String name,int age);
}
UserController2.java
package com.ldy.bootv2.demo.controller;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.ldy.bootv2.demo.dao.UserDao;
import com.ldy.bootv2.demo.entity.UserEntity;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiParam;
@Api(tags = "使用者資訊管理介面-v2-API")
@RestController
@RequestMapping("/user")
public class UserController2 {
private static Logger logger = LoggerFactory.getLogger(UserController2.class);
@Autowired
UserDao userDao;
@GetMapping("/findByNameLike")
public List<UserEntity> findByNameLike(@RequestParam(value = "name") String name) {
logger.info("您呼叫了findByNameLike介面");
return userDao.findByNameLike("%" + name + "%");
}
@GetMapping("/findByAgeBetween")
public List<UserEntity> findByAgeBetween(@RequestParam int min, @RequestParam int max) {
logger.info("您呼叫了findByNameLike介面");
return userDao.findByAgeBetween(min, max);
}
@SuppressWarnings("deprecation")
@GetMapping("/findPage")
public Page<UserEntity> findPage(
@RequestParam(value = "name") String name,
@RequestParam(value = "page", defaultValue = "0") Integer page,
@RequestParam(value = "size", defaultValue = "10") Integer size) {
logger.info("您呼叫了findPage介面");
Sort sort = new Sort(Sort.Direction.DESC, "id");
Pageable pageable = new PageRequest(page, size, sort);
Page<UserEntity> pages = userDao.findByNameLike("%" + name + "%", pageable);
return pages;
}
@GetMapping("/findByHql")
public List<UserEntity> findByHql(
@RequestParam(value = "name") String name,
@RequestParam(value = "age") Integer age) {
logger.info("您呼叫了findByHql介面");
return userDao.findByHql(name,age);
}
@DeleteMapping("/deleteByHql/{id}")
public String deleteByHql(@ApiParam(value = "使用者id", required = true) @PathVariable("id") Integer id) {
logger.info("您呼叫了deleteBySql介面");
try {
userDao.deleteByHql(id);
} catch (Exception e) {
logger.error("失敗，原因：" + e.getMessage());
return "error";
}
return "success";
}
@GetMapping("/findBySql")
public List<UserEntity> findBySql(
@RequestParam(value = "name") String name,
@RequestParam(value = "age") Integer age) {
logger.info("您呼叫了findBySql介面");
return userDao.findBySql(name,age);
}
@DeleteMapping("/deleteBySql/{id}")
public String deleteBySql(@ApiParam(value = "使用者id", required = true) @PathVariable("id") Integer id) {
logger.info("您呼叫了deleteBySql介面");
try {
userDao.deleteBySql(id);
} catch (Exception e) {
logger.error("失敗，原因：" + e.getMessage());
return "error";
}
return "success";
}
@GetMapping("/insertBySql")
public String insertBySql(
@RequestParam(value = "name") String name,
@RequestParam(value = "age", defaultValue = "0") Integer age) {
logger.info("您呼叫了insertBySql介面");
try {
userDao.insertBySql(name, age);
} catch (Exception e) {
logger.error("失敗，原因：" + e.getMessage());
return "error";
}
return "success";
}
}
