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  • SpringBoot整合SpringDataJPA

    SpringBoot+SpringData快速完成微服务架构CRUD操作

    https://img-blog.csdnimg.cn/20181229105131157

    SpringBoot+SpringData快速完成微服务架构CRUD操作

    ​​​废话不多说，直接上项目演示

    ​

    https://img-blog.csdnimg.cn/20181229105131199

    ​按条件查询

    ​

    https://img-blog.csdnimg.cn/20181229105131242

    ​

    ​按名称查询

    https://img-blog.csdnimg.cn/20181229105131289

    ​添加图书

    ​

    https://img-blog.csdnimg.cn/20181229105131341

    ​

    ​

    https://img-blog.csdnimg.cn/20181229105131382

    ​可进行修改

    ​

    https://img-blog.csdnimg.cn/20181229105131421

    ​

    https://img-blog.csdnimg.cn/20181229105131464

    ​

    可进行删除

    ​

    https://img-blog.csdnimg.cn/20181229105131513

    ​

    后台运行的SQL语句

    ​

    https://img-blog.csdnimg.cn/20181229105131568

    ​​

    详细项目演示地址

    点我看项目演示

    若要代码请评论邮箱，我发给你~​

    ​

    先看下项目结构​

    该项目主要是以图书管理来做的

    ​​

    ​

    ​主运行程序

    ​

    https://img-blog.csdnimg.cn/20181229105131637

    ​

    ​

    ​Controller层

    package com.java1234.controller;

import java.util.List;

import javax.annotation.Resource;

import javax.persistence.criteria.CriteriaBuilder;

import javax.persistence.criteria.CriteriaQuery;

import javax.persistence.criteria.Predicate;

import javax.persistence.criteria.Root;

import org.springframework.data.jpa.domain.Specification;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.servlet.ModelAndView;

import com.java1234.entity.Book;

import com.java1234.repository.BookDao;

@Controller

@RequestMapping("/book")

public class BookController {

@Resource

private BookDao bookDao;

/**

* 查询所有图书

*

* @return

*/

@RequestMapping("/list")

public ModelAndView list() {

ModelAndView andView = new ModelAndView();

andView.addObject("bookList", bookDao.findAll());

andView.setViewName("bookList");

return andView;

}

@RequestMapping(value = "/add", method = RequestMethod.POST)

public String add(Book book) {

System.err.println(book.getName());

System.err.println(book.getAuthor());

bookDao.save(book);

return "forward:/book/list";

}

/**

* 根据Id查找

*

* @param id

* @return

*/

@RequestMapping(value = "/preUpdate/{id}")

public ModelAndView preUpdate(@PathVariable("id") Integer id) {

ModelAndView mv = new ModelAndView();

mv.addObject("book", bookDao.getOne(id));

mv.setViewName("bookUpdate");

return mv;

}

@RequestMapping("/addbook.html")

public String addbookOne() {

return "bookadd";

}

/**

* 根据条件动态查询

* @param book

* @return

*/

@RequestMapping("/list2")

public ModelAndView list2(Book book) {

ModelAndView mv = new ModelAndView();

List<Book> bookList = bookDao.findAll(new Specification<Book>() {

/**

*

*/

private static final long serialVersionUID = 1L;

/**

* 动态拼接条件

*/

@Override

public Predicate toPredicate(Root<Book> root, CriteriaQuery<?> query, CriteriaBuilder cb) {

Predicate pj = cb.conjunction();

if (book != null) {

if (book.getName()!=null && !"".equals(book.getName())) {

pj.getExpressions().add(cb.like(root.get("name"), "%"+book.getName()+"%"));

}

if (book.getAuthor()!=null && !"".equals(book.getAuthor())) {

pj.getExpressions().add(cb.like(root.get("author"), "%"+book.getAuthor()+"%"));

}

}

return pj;

}

});

mv.setViewName("bookList");

mv.addObject("bookList", bookList);

return mv;

}

/**

* 修改图书

*

* @param book

* @return

*/

/* @RequestMapping(value="/update"

* ,method=RequestMethod.POST) */

@PostMapping(value = "/update")

public String update(Book book) {

bookDao.save(book);

return "forward:/book/list";

}

@GetMapping("/delete")

public String delete(Integer id) {

bookDao.deleteById(id);

return "forward:/book/list";

}

@ResponseBody

@GetMapping("/queryByName")

public List<Book> queryByName(){

return bookDao.findByName("java");

}

/**

* 使用本地查询 随机查询两条

* @return

*/

@ResponseBody

@GetMapping("/randomList")

public List<Book> randomList(){

return bookDao.randomList(2);

}

}

    ​

    ​

    实体类

    package com.java1234.entity;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.Table;

@Entity

@Table(name="t_book")

public class Book {

@Id

@GeneratedValue

private Integer id;

@Column(length=100)

private String name;

@Column(length=50)

private String author;

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 String getAuthor() {

return author;

}

public void setAuthor(String author) {

this.author = author;

}

}

    ​

    Dao层

    package com.java1234.repository;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;

import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

import org.springframework.data.jpa.repository.Query;

import com.java1234.entity.Book;

public interface BookDao extends JpaRepository<Book, Integer>,JpaSpecificationExecutor<Book> {

// HQL

@Query("select b from Book b where b.name like %?1%")

public List<Book> findByName(String name);

@Query(value="select * from t_book order by RAND() LIMIT ?1",nativeQuery=true)

public List<Book> randomList(Integer n);

}

    ​

    ​yml配置文件

    https://img-blog.csdnimg.cn/20181229105131681

    ​​

    ​

    ​

    POM.XML

    <?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.java1234</groupId>

<artifactId>springboot-springData-2</artifactId>

<version>0.0.1-SNAPSHOT</version>

<packaging>jar</packaging>

<name>springboot-springData-5</name>

<description>Demo project for Spring Boot</description>

<parent>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-parent</artifactId>

<version>2.1.0.BUILD-SNAPSHOT</version>

<relativePath/> <!-- lookup parent from repository -->

</parent>

<properties>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

<java.version>1.8</java.version>

</properties>

<dependencies>

<!-- freemarker -->

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-freemarker</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-test</artifactId>

<scope>test</scope>

</dependency>

<!-- Mysql驱动 -->

<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>5.1.31</version>

</dependency>

<!-- Springboot-springdata-jpa -->

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-data-jpa</artifactId>

</dependency>

<!-- 热部署 -->

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-devtools</artifactId>

<optional>true</optional>

<scope>true</scope>

</dependency>

</dependencies>

<build>

<plugins>

<plugin>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

</build>

<repositories>

<repository>

<id>spring-snapshots</id>

<name>Spring Snapshots</name>

<url>https://repo.spring.io/snapshot</url>

<snapshots>

<enabled>true</enabled>

</snapshots>

</repository>

<repository>

<id>spring-milestones</id>

<name>Spring Milestones</name>

<url>https://repo.spring.io/milestone</url>

<snapshots>

<enabled>false</enabled>

</snapshots>

</repository>

</repositories>

<pluginRepositories>

<pluginRepository>

<id>spring-snapshots</id>

<name>Spring Snapshots</name>

<url>https://repo.spring.io/snapshot</url>

<snapshots>

<enabled>true</enabled>

</snapshots>

</pluginRepository>

<pluginRepository>

<id>spring-milestones</id>

<name>Spring Milestones</name>

<url>https://repo.spring.io/milestone</url>

<snapshots>

<enabled>false</enabled>

</snapshots>

</pluginRepository>

</pluginRepositories>

</project>
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  • 原文地址：https://www.cnblogs.com/chengxiaolong/p/10206327.html
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