（五）spring-boot中使用spring-data-jpa（hibernate实现）

好久没写了，今天更一篇。在spring-boot中使用spring-data-jpa作为持久层框架，hibernate作为实现。在多项目构建的基础上，在dafangzi-core，dafangzi-system中引入对spring-boot-starter-data-jpa的依赖。
首先，增加service层公共接口，

package com.xkx.dafangzi.core.foundation.service;import com.xkx.dafangzi.core.foundation.entity.BaseEntity;/** * Created by Administrator on 2017/8/3. */public interface IBaseService<T extends BaseEntity, PK> {    public T saveOrUpdate(T t);    public int deleteById(PK id);    public int deleteByIds(String ids);    public T getEntityById(PK id);}

然后创建接口ISystemConfigService继承自IBaseService。创建SystemConfigServiceImpl类实现ISystemConfigService，在实现类中引用ISystemConfigDao，该类继承子spring中的JpaRepository，在实现中就可以使用spring提供的已有方法了。

package com.xkx.dafangzi.system.service.impl;import com.xkx.dafangzi.core.foundation.service.impl.BaseServiceImpl;import com.xkx.dafangzi.system.dao.ISystemConfigDao;import com.xkx.dafangzi.system.entity.SystemConfigEntity;import com.xkx.dafangzi.system.service.ISystemConfigService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;/** * Created by pc on 2017/8/13. */@Servicepublic class SystemConfigServiceImpl implements ISystemConfigService {    @Autowired    private ISystemConfigDao systemConfigDao;    @Override    public SystemConfigEntity saveOrUpdate(SystemConfigEntity systemConfigEntity) {        return systemConfigDao.saveAndFlush(systemConfigEntity);    }    @Override    public int deleteById(Long id) {        return 0;    }    @Override    public int deleteByIds(String ids) {        return 0;    }    @Override    public SystemConfigEntity getEntityById(Long id) {        return systemConfigDao.findOne(id);    }}

在fangzi-system中添加实体SystemConfigEntity，

package com.xkx.dafangzi.system.entity;import com.xkx.dafangzi.core.foundation.entity.BaseEntity;import javax.persistence.*;import java.io.Serializable;/** * Created by pc on 2017/8/9. */@Entity@Table(name="dafangzi_system_config")public class SystemConfigEntity extends BaseEntity {    private String systemId;    private String systemName;    public String getSystemId() {        return systemId;    }    public void setSystemId(String systemId) {        this.systemId = systemId;    }    public String getSystemName() {        return systemName;    }    public void setSystemName(String systemName) {        this.systemName = systemName;    }}

最后，添加配置文件，

spring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/dafangzispring.datasource.username=rootspring.datasource.password=rootspring.jpa.database=mysqlspring.jpa.show-sql=truespring.jpa.hibernate.ddl-auto=updatespring.jpa.hibernate.naming-strategy=org.hibernate.cfg.DefaultNamingStrategyspring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

并且增加Application作为启动的入口，

package com.xkx.dafangzi.web.test.controller;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.EnableAutoConfiguration;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.context.annotation.ComponentScan;/** * Created by pc on 2017/7/26. *///@SpringBootApplication@ComponentScan(basePackages = "com.xkx.dafangzi")@EnableConfigurationProperties@EnableAutoConfigurationpublic class Application {    public static void main(String[] args) throws Exception {        SpringApplication.run(Application.class, args);    }}

运行后，访问SystemConfigController中的请求，即可自动生成数据库表。
详细代码可参看https://github.com/xukexin/dafangzi