String data jpa执行的增删改查

entity实体类：

package com.qzy.entity;

import javax.persistence.*;

/**
 * Created by cmy on 2019/12/5.
 */
@Entity
@Table(name="studentinfo")
public class Student {
    @Id
    @GeneratedValue //默认让它自增
    private Integer id;

    @Column(name="stu_name")
    private String stuname;

    private Integer sex;

    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getStuname() {
        return stuname;
    }

    public void setStuname(String stuname) {
        this.stuname = stuname;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Student(String stuname, Integer sex, Integer age) {
        this.stuname = stuname;
        this.sex = sex;
        this.age = age;
    }

    public Student() {
    }
}


dao接口：

package com.qzy.dao;

import com.qzy.entity.Student;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;

import java.util.List;

/**
 * Created by cmy on 2019/12/5.
 */
public interface StudentDao extends JpaRepository<Student,Integer>{
    @Query(value="select * from studentinfo where stu_name=?1",nativeQuery = true)
    Student findByStuname(String stuname);
    List<Student> findByStunameLike(String stuname);

}

application.properties配置：

#配置数据库的四个连接参数
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3307/account
spring.datasource.username=root
spring.datasource.password=root


#Spring Data JPA的配置
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jackson.serialization.indent-output=true
spring.jpa.database=mysql

Contorller层：

package com.qzy.controller;

import com.qzy.dao.StudentDao;
import com.qzy.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.Arrays;
import java.util.List;

/**
 * Created by cmy on 2019/12/5.
 */
@Controller //@Controller+@ResponseBody
public class StudentController {

    @Autowired
    StudentDao dao;

    @RequestMapping("/saveAllStudent")
    public String saveAllStudent(){
        //Hibernate:瞬时状态 游离状态 持久状态
        List<Student> students = Arrays.asList(new Student("张三", 1, 4),
                new Student("李四", 0, 3),
                new Student("王五", 1, 4));
        dao.saveAll(students);
        //save(T t):向数据库中增加单条记录
        //saveAll(Iterable i):增加多条记录
        //saveAndFlush():增加并刷新缓存
        return "success";
    }

    @RequestMapping("/deleteYeShou")
    public String deleteYeShou(){
        //dao.deleteById(4); 通过ID删除单条记录
        Student yeshou1=new Student();
        yeshou1.setId(1);
        Student yeshou2=new Student();
        yeshou2.setId(3);
        dao.deleteAll(Arrays.asList(yeshou1,yeshou2)); //批量删除
        return "success";
    }

    @RequestMapping("/modifyBeantifulGirl")
    public String modifyStudent(){
        Student one = dao.getOne(9); //检索单条记录的方法
        one.setAge(18);
        one.setStuname("猪猪");
        dao.save(one); //修改数据的作用
        return "success";
    }

    @RequestMapping("/getAll")
    @ResponseBody
    public Object getAll(){
        return dao.findAll();
    }


    @RequestMapping("/getByName")
    @ResponseBody
    public Object getByName(){
        return dao.findByStuname("猪猪");
    }

    @RequestMapping("/getLike")
    @ResponseBody
    public Object getByName(String name){
        return dao.findByStunameLike("%"+name+"%");
    }

}

pom.xml:

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</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-thymeleaf</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-webflux</artifactId>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.32</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>io.projectreactor</groupId>
        <artifactId>reactor-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

目录：