Spring Boot集成mongodb數據庫

一．認識mongodb
MongoDB是一個介於關係數據庫和非關係數據庫之間的產品，是非關係數據庫當中功能最豐富，最像關係數據庫的。它支持的數據結構非常鬆散，是類似json的bson格式，因此可以存儲比較複雜的數據類型。Mongo最大的特點是它支持的查詢語言非常強大，其語法有點類似於面向對象的查詢語言，幾乎可以實現類似關係數據庫單表查詢的絕大部分功能，而且還支持對數據建立索引。
二．Spring boot項目集成mongodb
1.添加mongodb依賴

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

2.配置mongodb的連接

spring：
    data:
            mongodb:
                #uri: mongodb://localhost:27017/data_exploration
                uri: mongodb://root:[email protected]:27017/data_exploration?authSource=admin&authMechanism=SCRAM-SHA-1

解析：以上uri分別代表本地配置和遠程連接
3.操作數據庫
（1）保存

@Repository
public class ExplorationJobDao {

    @Autowired
    MongoTemplate mongoTemplate;

    public void save(ExplorationJob explorationJob) {
        mongoTemplate.save(explorationJob);
    }
}

（2）根據ID修改一條數據（其原理先符合ID的數據，然後刪除查詢結果的第一條）

public void updateExecutionStatusById(int executionStatus, String jobId) {
            Query query = new Query(Criteria.where("jobId").is(jobId));
            Update update = new Update().set("executionStatus", executionStatus);
            mongoTemplate.updateFirst(query, update, ExplorationJob.class);
    }

（3）根據條修改多條數據（查詢符合ID的所有數據，然後將所有數據修改）

public void update(BusinessExploration businessExploration) {
        Query query = new Query(Criteria.where("_id").is(businessExploration.getId()));
        Update update = new Update().set("sourceUnit", businessExploration.getSourceUnit())
                .set("appSystem", businessExploration.getAppSystem())
                .set("businessImplication", businessExploration.getBusinessImplication())
                .set("safetyRequire", businessExploration.getSafetyRequire());
        mongoTemplate.updateMulti(query, update, TableExploration.class);
    }

（4）刪除（根據ID刪除）

public void delExplorationJobById(String jobId) {
         Query query=new Query(Criteria.where("jobId").is(jobId));
         mongoTemplate.remove(query,ExplorationJob.class);
    }

（5）根據條件查詢（根據ID查詢）

public ExplorationJob getExplorationJobByJobId(String jobId) {
        Query query = new Query(Criteria.where("jobId").is(jobId));
        ExplorationJob explorationJob = mongoTemplate.findOne(query, ExplorationJob.class);
        return explorationJob;
    }

（6）查詢所有

mongoTemplate.findAll(TableExploration.class);

（7）多條件動態查詢

public List<ExplorationJob> getExplorationByCondition(ExplorationJob explorationJob) {
        Query query = new Query();
        if (explorationJob.getJobName() != null) {
             Pattern pattern = Pattern.compile("^.*" + explorationJob.getJobName() + ".*$", Pattern.CASE_INSENSITIVE);
             query.addCriteria(Criteria.where("jobName").regex(pattern));
        }
        if (explorationJob.getDsType() != null) {
            query.addCriteria(Criteria.where("dsType").is(explorationJob.getDsType()));
        }
        if (explorationJob.getExecutionStatus() != null) {
             query.addCriteria(Criteria.where("executionStatus").lte(explorationJob.getExecutionStatus()));
        }
        List<ExplorationJob> explorationJobs=mongoTemplate.find(query, ExplorationJob.class);
        return explorationJobs;
    }

（8）查詢最大值

public Date getMaxExplorationDate(String tableName) {
        FindIterable<Document> iterable = mongoTemplate.getCollection("tableExploration")
                .find(new BasicDBObject("tableName", tableName)).sort(new BasicDBObject("explorationDate", -1)).skip(0)
                .limit(1);
        Document doc =null;
        if (getDocuments(iterable).size()>0) {
            doc=getDocuments(iterable).get(0);
            Date date = doc.getDate("explorationDate");
            return date;
        }else {
            return null;
        }
    }

    /**
     * 工具方法
     * 
     * @param iterable
     * @return
     */
    public static List<Document> getDocuments(FindIterable<Document> iterable) {
        List<Document> results = new ArrayList<Document>();
        if (null != iterable) {
            MongoCursor<Document> cursor = iterable.iterator();
            Document doc = null;
            while (cursor.hasNext()) {
                doc = cursor.next();
                results.add(doc);
            }
        }
        return results;
    }

（9）分組查詢（這裏還是用到了排序）

public List<TableExploration> getAllTableExplorationGroupByTableName(String jobId){
        Aggregation aggregation = Aggregation.newAggregation(
                Aggregation.match(Criteria.where("jobId").is(jobId)),
                Aggregation.sort(new Sort(Direction.DESC,"explorationDate")),
                Aggregation.group("tableName")
                .first("_id").as("tableName")
                .first("databaseType").as("databaseType")
                .first("databaseName").as("databaseName")
                .first("networkSituation").as("networkSituation")
                .first("userName").as("userName")
                .first("password").as("password")
                .first("url").as("url")
                .first("dataStorage").as("dataStorage")
                .first("dataIncrement").as("dataIncrement")
                .first("explorationDate").as("explorationDate")
                //.push("columnExplorations").as("columnExplorations")
                .first("jobId").as("jobId")
                );
        AggregationResults<TableExploration> aggregationResults= mongoTemplate.aggregate(aggregation, "tableExploration", TableExploration.class);
        List<TableExploration> tableExplorations=aggregationResults.getMappedResults();
        return tableExplorations;

                                                                                                                                                                                                【常用操作總結完畢】