（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. */ @Service public 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.Driver spring.datasource.url=jdbc:mysql://localhost:3306/dafangzi spring.datasource.username=root spring.datasource.password=root spring.jpa.database=mysql spring.jpa.show-sql=true spring.jpa.hibernate.ddl-auto=update spring.jpa.hibernate.naming-strategy=org.hibernate.cfg.DefaultNamingStrategy spring.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 @EnableAutoConfiguration public 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

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