SpringData MongoDB 入门

Posted 2020-11-27 路上的风景

1.创建工程，引入坐标

<dependencies>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-mongodb</artifactId>
        <version>2.1.8.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>5.1.6.RELEASE</version>
    </dependency>
</dependencies>

2.创建配置文件applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:mongo="http://www.springframework.org/schema/data/mongo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/data/mongo
        http://www.springframework.org/schema/data/mongo/spring-mongo.xsd">

    <mongo:repositories base-package="com.fgy.dao"></mongo:repositories>

    <!-- spring连接mongodb数据库的配置 -->
    <mongo:mongo-client host="192.168.43.182" port="27017" id="mongo">
        <!--
            Spring在插入数据库时没有返回状态配置:write-concern获取异常
            WriteConcern.NONE:没有异常抛出
            WriteConcern.NORMAL:仅抛出网络错误异常，没有服务器错误异常
            WriteConcern.SAFE:抛出网络错误异常、服务器错误异常；并等待服务器完成写操作。
            WriteConcern.MAJORITY: 抛出网络错误异常、服务器错误异常；并等待一个主服务器完成写操作。
            WriteConcern.FSYNC_SAFE: 抛出网络错误异常、服务器错误异常；写操作等待服务器将数据刷新到磁盘。
            WriteConcern.JOURNAL_SAFE:抛出网络错误异常、服务器错误异常；写操作等待服务器提交到磁盘的日志文件。
            WriteConcern.REPLICAS_SAFE:抛出网络错误异常、服务器错误异常；等待至少2台服务器完成写操作。
         -->
        <mongo:client-options write-concern="SAFE"/>
    </mongo:mongo-client>
    <mongo:db-factory id="mongoDbFactory" dbname="articledb" mongo-ref="mongo"/>

    <!--mongoTemplate-->
    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
        <constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/>
    </bean>
</beans>

3.创建实体类

// @Document(collection = "article")
@Document("article")
public class Article {

    @Id
    private Integer id;
    @Field("title") // 给映射存储到 mongodb 的字段取别名
    private String title;
    private String content;
    private Integer hits;
    
    /*********** get/set方法 ***********/
}

4.自定义 dao接口

// 自定义dao接口继承MongoRepository<实体类型，主键类型>
public interface ArticleDao extends MongoRepository<Article, Integer> {
}

5.测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class ArticleDaoTest {

    @Autowired
    private ArticleDao articleDao;

    @Test
    public void testSave() {
        Article article = new Article();
        article.setId(1);
        article.setTitle("java入门到精通");
        article.setContent("趁现在还年轻，转行吧！");
        article.setHits(100);
        articleDao.save(article);
    }
}