SpringBoot05 数据操作01 - JPA的基本使用、基本使用02

前提：

　　创建一个springboot项目

　　创建一个名为springboottest的MySQL数据库

1 jar包准备

　　jpa的jar包

　　mysql驱动的jar包

　　druid数据库连接池的jar包

　　lombok工具jar包

　　注意01： druid的jar包在都如时一定要指定版本，其它的spring boot项目会自动进行版本管理

<?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>cn.xiangxu</groupId><artifactId>springboot</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>springboot</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.8.RELEASE</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><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><!--数据库相关--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.19</version></dependency><!--工具--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

pom.xml

2 数据库连接池配置和JPA配置

spring:datasource:type: com.alibaba.druid.pool.DruidDataSource # 指定使用druid连接池driver-class-name: com.mysql.jdbc.Driverusername: rootpassword: 182838url: jdbc:mysql://127.0.0.1/springboottest?characterEncoding=utf-8&useSSL=false#最大活跃数maxActive: 20#初始化数量initialSize: 1#最大连接等待超时时间maxWait: 60000#打开PSCache，并且指定每个连接PSCache的大小poolPreparedStatements: truemaxPoolPreparedStatementPerConnectionSize: 20#通过connectionProperties属性来打开mergeSql功能；慢SQL记录#connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000minIdle: 1timeBetweenEvictionRunsMillis: 60000minEvictableIdleTimeMillis: 300000validationQuery: select 1 from dualtestWhileIdle: truetestOnBorrow: falsetestOnReturn: false#配置监控统计拦截的filters，去掉后监控界面sql将无法统计,'wall'用于防火墙filters: stat, wall, log4jjpa:show-sql: truehibernate:ddl-auto: update
#      format-sql: true # TODO: 配置失败

连接池和JPA配置

package cn.xiangxu.springboot.baseConfig;import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** 配置DRUID访问的Sevlet和filter*/
@Configuration
public class DruidConfiguration {@Beanpublic ServletRegistrationBean statViewServlet(){//创建servlet注册实体ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),"/druid/*");//设置ip白名单servletRegistrationBean.addInitParameter("allow","127.0.0.1");//设置ip黑名单，如果allow与deny共同存在时,deny优先于allowservletRegistrationBean.addInitParameter("deny","192.168.0.19");//设置控制台管理用户servletRegistrationBean.addInitParameter("loginUsername","wys");servletRegistrationBean.addInitParameter("loginPassword","123456");//是否可以重置数据servletRegistrationBean.addInitParameter("resetEnable","false");return servletRegistrationBean;}@Beanpublic FilterRegistrationBean statFilter(){//创建过滤器FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());//设置过滤器过滤路径filterRegistrationBean.addUrlPatterns("/*");//忽略过滤的形式filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");return filterRegistrationBean;}
}

druid的servlet和filter配置

jpa基础配置详解：点击前往

druid配置详解：点击前往

3 创建一个实体类

　　实体类相关注解说明：点击前往

　　技巧01：lombok的妙用

　　注意01：使用lombok的坑 -> 即使导入了相关的jar包，lombok的注解在IDEA中时不会生效的，但是项目进行打包后就会生效 -> 解决办法

package cn.xiangxu.springboot.entity.dataObject;import lombok.Data;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;@Entity
@Data
public class Girl {@Id@GeneratedValue@Column(name = "girlId")private Integer id;private Integer age;private String name;public Girl() {}public Girl(Integer age, String name) {this.age = age;this.name = name;}
}

实体类

4 创建一个与实体类对应的持久层接口

　　注意01：该接口需要实现一个特定的父接口JpaRepository，继承了这个接口后就该接口就会自动被容器管理，无需再添加注解

chijge cn.xiangxu.springboot.repository;import cn.xiangxu.springboot.entity.dataObject.Girl;
import org.springframework.data.jpa.repository.JpaRepository;public interface GirlRepository extends JpaRepository<Girl, Integer> {}

持久层接口

5 创建一个服务层接口

　　调用持久层对象的相应方法实现简单的增删改查操作

package cn.xiangxu.springboot.service;import cn.xiangxu.springboot.entity.dataObject.Girl;import java.util.List;public interface GirlService {Girl saveGirl(Girl girl);Girl findGirlOne(Integer id);List<Girl> finGirldAll();
}

服务层接口

package cn.xiangxu.springboot.service.serviceImpl;import cn.xiangxu.springboot.entity.dataObject.Girl;
import cn.xiangxu.springboot.repository.GirlRepository;
import cn.xiangxu.springboot.service.GirlService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;@Service("girlService")
public class GirlServiceImpl implements GirlService {@Autowiredprivate GirlRepository girlRepository;@Overridepublic Girl saveGirl(Girl girl) {return girlRepository.save(girl);}@Overridepublic Girl findGirlOne(Integer id) {return girlRepository.findOne(id);}@Overridepublic List<Girl> finGirldAll() {return girlRepository.findAll();}
}

服务层接口实现类

6 创建服务层测试类

package cn.xiangxu.springboot.service.serviceImpl;import cn.xiangxu.springboot.entity.dataObject.Girl;
import cn.xiangxu.springboot.service.GirlService;
import lombok.extern.slf4j.Slf4j;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.util.List;import static org.junit.Assert.*;@RunWith(SpringRunner.class)
@SpringBootTest
@Slf4j // 日志相关
public class GirlServiceImplTest {@Autowiredprivate GirlService girlService;@Testpublic void saveGirl() throws Exception {Girl girl = new Girl(25, "三少");Girl result = girlService.saveGirl(girl);log.info("【插入数据】");Assert.assertNotEquals(null, result);}@Testpublic void findGirlOne() throws Exception {Girl result = girlService.findGirlOne(1);log.info("【查询单个】");Assert.assertEquals(new Integer(1), result.getId());}@Testpublic void finGirldAll() throws Exception {List<Girl> girls = girlService.finGirldAll();log.info("查询列表");Assert.assertNotEquals(new Integer(0), new Integer(girls.size()));}}

服务层测试类

7 具体使用02

　　说明：不使用数据库连接池，这里只是给出一些特殊的地方

　　坑01：springboot版本升级后，实体类中的id字段必须根据数据库类型设定对应的默认主键值产生类型

package cn.xiangxu.jpa_demo01.domain.domain_do;import lombok.Data;import javax.persistence.*;/*** @author 王杨帅* @create 2018-08-12 15:01* @desc**/
@Entity
@Table(name = "student")
@Data
public class Student {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private String id;private String name;private Integer age;private String address;
}

Student.java

spring:datasource:url: jdbc:mysql://127.0.0.1/testdemo?characterEncoding=utf-8&useSSL=false
    username: rootpassword: 182838jpa:properties:hibernate:format_sql: trueshow_sql: true

配置类

package cn.xiangxu.jpa_demo01.repository;import cn.xiangxu.jpa_demo01.domain.domain_do.Student;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;import java.util.List;import static org.junit.Assert.*;@RunWith(SpringRunner.class)
@SpringBootTest
public class StudentRepositoryTest {@Autowiredprivate StudentRepository studentRepository;@Testpublic void findAll() {List<Student> all = studentRepository.findAll();Assert.assertTrue(all.size() > 0);}}

测试类

转载于:https://www.cnblogs.com/NeverCtrl-C/p/7904680.html