九.Spring Boot JPAHibernateSpring Data

Posted 2020-09-09 永恒之心

1、项目结构

2、导入jar包

<!-- 添加Spring-data-jpa依赖. -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

3、添加并编辑 文件：application.properties

spring.datasource.url = jdbc:mysql://localhost:3306/AppleforWindows_test1?characterEncoding=utf8&useSSL=true
说明：5.7的mysql必须加入：characterEncoding=utf8&useSSL=true
spring.datasource.username = root
spring.datasource.password = AppleforWindows
spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.max-active=20
spring.datasource.max-idle=8
spring.datasource.min-idle=8
spring.datasource.initial-size=10
自动在数据库创建table表
spring.jpa.database = MYSQL
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
#[org.hibernate.cfg.ImprovedNamingStrategy  #org.hibernate.cfg.DefaultNamingStrategy]
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

4、添加实体类set\\get

package com.ld.bean;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

import com.alibaba.fastjson.annotation.JSONField;

/*创建了一个实体类。
* 
* 如何持久化呢？
* 
* 1、使用@Entity进行实体类的持久化操作，当JPA检测到我们的实体类当中有
* 
* @Entity 注解的时候，会在数据库中生成对应的表结构信息。
* 
* 
* 如何指定主键以及主键的生成策略？
* 
* 2、使用@Id指定主键.*/
@Entity
public class SysUser {
    
    /*设置为主键*/
    @Id @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    private String name;
    private String phone;
    private String mail;
    @JSONField(format="yyyy-MM-dd HH:mm")
    private Date createTime;
    private String remark;
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getMail() {
        return mail;
    }
    public void setMail(String mail) {
        this.mail = mail;
    }
    public Date getCreateTime() {
        return createTime;
    }
    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
    public String getRemark() {
        return remark;
    }
    public void setRemark(String remark) {
        this.remark = remark;
    }
    

}

6、创建server

提示：可根据自定义查看（DAORepository 接口并继承 CrudRepository<T, Integer>该类的源码）

package com.ld.service;

import javax.annotation.Resource;
import javax.transaction.Transactional;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import com.ld.bean.SysUser;
import com.ld.repository.SysUserRepository;


@Service("sysUserService")
public class SysUserService {
    static final Logger logger = LoggerFactory.getLogger(SysUserService.class);

    @Resource
    private SysUserRepository sysUserRepository;

    public Iterable<SysUser> findAll() {
        logger.info("=>：findAll");
        return sysUserRepository.findAll();
    }

    public SysUser findOne(Integer id) {
        logger.info("=>：findOne");
        return sysUserRepository.findOne(id);
    }
    
    @Transactional
    public SysUser save(SysUser sysUser) {
        logger.info("=>：save");
        return sysUserRepository.save(sysUser);
    }

    public long count() {
        logger.info("=>：count");
        return sysUserRepository.count();
    }
    @Transactional
    public void delete(Integer id) {
        logger.info("=>：delete");
        sysUserRepository.delete(id);
    }
}

7、测试controller

package com.ld.controller;

import java.util.Date;

import javax.annotation.Resource;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import com.ld.bean.SysUser;
import com.ld.service.SysUserService;
import com.ld.util.CommonTool;

@RestController
@RequestMapping("sysUserWeb")
public class SysUserWeb {
    @Resource
    private  SysUserService sysUserService;
    @RequestMapping("/index")
    public ModelAndView index(){
        ModelAndView mv = new ModelAndView("redirect:AmazeUI/error.html");
        return mv;
    }
    @RequestMapping("/getAll")
    @ResponseBody
    public Iterable<SysUser> getAll(){
        return sysUserService.findAll();
    }
    @RequestMapping("/save")
    @ResponseBody
    public SysUser save(){
        SysUser sysUser = new SysUser();
        sysUser.setName(CommonTool.getRandomString(6));
        sysUser.setPhone(CommonTool.getRandomPhone());
        sysUser.setMail(CommonTool.getRandomMail());
        sysUser.setCreateTime(new Date());
        sysUserService.save(sysUser);
        return sysUser;
    }
    @RequestMapping("/queryOne")
    @ResponseBody
    public SysUser queryOne(){
        return sysUserService.findOne(1);
    }
}