springboot整合hibernate

看完了上一篇文章，相信对hibernate有了点了解，再看看springboot整合hibernate

1使用springinit选择jpa和mysqldriv和web快速搭建

2创建普通maven在pom.xml文件里面添加要使用的jpa依赖：

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

下面再看看完整版的依赖

  <dependencies>

            <!-- 添加对jsp视图解析的支持 -->
            <dependency>
                <groupId>org.apache.tomcat.embed</groupId>
                <artifactId>tomcat-embed-jasper</artifactId>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jstl</artifactId>
            </dependency>


            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>


            <!-- 下面两个引入为了操作数据库 -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-jpa</artifactId>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>



            <dependency> 
                <groupId>org.springframework.boot</groupId> 
                <artifactId>spring-boot-starter-tomcat</artifactId> 
                <scope>provided</scope> 
            </dependency>

            <!-- 只需引入spring-boot-devtools 即可实现热部署 -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
            </dependency>

            <!-- Json包 -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.16</version>
            </dependency>

            <!-- 为了监控数据库 -->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.0.25</version>
            </dependency>


            <dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi</artifactId>
                <version>3.14</version>
            </dependency>

            <!-- Junit 单元测试 -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>

            <dependency> 
                <groupId>io.springfox</groupId> 
                <artifactId>springfox-swagger2</artifactId> 
                <version>2.6.0</version> 
            </dependency> 
            <dependency> 
                <groupId>io.springfox</groupId> 
                <artifactId>springfox-swagger-ui</artifactId> 
                <version>2.6.0</version> 
            </dependency>

添加依赖之后需要配置一些连接mysql所需要的配置，创建一个application.properties：

resources下的应用配置文件application.properties。在myecplise里面创建配置文件是放在src文件夹下面，

但是最后编译出来的文件还是在classes文件夹下面 

先来个最简单的

spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://localhost:3306/test?serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root

再看个加强版本

 # 数据库访问配置
    # 主数据源，默认的
    spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
    spring.datasource.url=jdbc:mysql://localhost:3306/test
    spring.datasource.username= root
    spring.datasource.password= root
    spring.datasource.driverClassName = com.mysql.jdbc.Driver


    # 下面为连接池的补充设置，应用到上面所有数据源中
    # 初始化大小，最小，最大
    spring.datasource.initialSize=5
    spring.datasource.minIdle=5
    spring.datasource.maxActive=20
    # 配置获取连接等待超时的时间
    spring.datasource.maxWait=60000
    # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 
    spring.datasource.timeBetweenEvictionRunsMillis=60000
    # 配置一个连接在池中最小生存的时间，单位是毫秒 
    spring.datasource.minEvictableIdleTimeMillis=300000
    spring.datasource.validationQuery=SELECT 1 FROM DUAL
    spring.datasource.testWhileIdle=true
    spring.datasource.testOnBorrow=false
    spring.datasource.testOnReturn=false
    # 打开PSCache，并且指定每个连接上PSCache的大小 
    spring.datasource.poolPreparedStatements=true
    spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
    # 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙 
    spring.datasource.filters=stat,wall,log4j
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
    # 合并多个DruidDataSource的监控数据
    spring.datasource.useGlobalDataSourceStat=true


    #JPA Configuration:  
    spring.jpa.database=MYSQL
    # Show or not log for each sql query
    spring.jpa.show-sql=false
    spring.jpa.generate-ddl=true  
    # Hibernate ddl auto (create, create-drop, update)
    spring.jpa.hibernate.ddl-auto=create  
    #spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect  
    spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy  
    #spring.jpa.database=org.hibernate.dialect.MySQL5InnoDBDialect 
    spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect


    spring.mvc.view.prefix=/WEB-INF/view/
    spring.mvc.view.suffix=.jsp
    #spring.resources.static-locations=classpath:/resources/,classpath:/static/

若需要部署到外部的tomcat容器中，则添加下面类即可。

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;
/**
 * 修改启动类，继承 SpringBootServletInitializer 并重写 configure 方法
 * @author ZSX
 *
 */
public class SpringBootStartApplication extends SpringBootServletInitializer {

    private static final Logger logger = LoggerFactory.getLogger(SpringBootStartApplication.class);

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(Application.class);
    }

}

 然后创建实体类

这里创建一个简单的User实体类,需要用到javax中的Entity,Id,GeneratedValue与GenerationType注解.
Entity用于标识实体类,Id用于标识主键,GeneratedValue与GenerationType用于配置主键.

@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    private String name;

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

 创建仓库UserRepository保存用户记录.需要继承CrudRepository<T,ID>,第一个类型为实体类,第二个类型为主键类型.

import org.springframework.data.repository.CrudRepository;

public interface UserRepository extends CrudRepository<User,Integer>
{
}

其余交给hibernate

如控制层的controller就这样

@Controller
@RequestMapping(path = "/demo")
public class MainController {
    @Autowired
    private UserRepository userRepository;

    @PostMapping(path = "/add")
    public @ResponseBody String addNewUser(@RequestParam String name)
    {
        User user = new User();
        user.setName(name);
        userRepository.save(user);
        return "Saved.";
    }

    @GetMapping(path = "/all")
    public @ResponseBody Iterable<User> getAllUsers()
    {
        return userRepository.findAll();
    }
}