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博客园 - mabiao008

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java程序中增加mongodb的联合索引
mabiao008 · 2025-05-22 · via 博客园 - mabiao008

早期,增加mongo索引,我只了解这一种

@Indexed
private String docId;

 这种不是联合索引。当时不了解其它方式,只想到一个办法,在服务启动后,判断是否含XX联合索引,没的话创建

 1 @Component
 2 @Slf4j
 3 public class MongoInit implements ApplicationRunner {
 4     @Resource
 5     protected MongoOperations mongoOperations;
 6 
 7     @Override
 8     public void run(ApplicationArguments args) throws Exception {
 9         try {
10             checkCollectionName();
11             checkCollectionIndex();
12         } catch (Exception e) {
13             log.error("索引插入异常, e:{}", e);
14         }
15     }
16     
17     /**
18      * 检查集合是否存在,不存在则创建
19      */
20     private void checkCollectionName() {
21         String collectionNameLib = "doc_lib";
22         if (!mongoOperations.collectionExists(collectionNameLib)) {
23             mongoOperations.createCollection(collectionNameLib);
24         }
25     }
26   
27     private void checkCollectionIndex() {
28         addIndexForLib();
29     }
30     
31   public void addIndexForLib() {
32         try {
33             IndexOperations indexOps = mongoOperations.indexOps("doc_lib");
34             List<IndexInfo> indexInfo = indexOps.getIndexInfo();
35             List<String> indexNames = indexInfo.stream().map(IndexInfo::getName).collect(Collectors.toList());
36 
37             if (!indexNames.contains("tenantId_account_label_orgCode")) {
38                 Map<String, Object> map = new HashMap<>();
39                 map.put("tenantId", 1);
40                 map.put("created_by", 1);
41                 map.put("label", 1);
42                 map.put("orgCode", 1);
43                 indexOps.ensureIndex(new CompoundIndexDefinition(new Document(map)).background());
44                 indexSleep();
45             }
46         } catch (Exception e) {
47             log.error("lib索引插入异常, e:{}", e);
48         }
49     }
50 }
51   

再后来,我得知了更优雅的方式:

spring:
  data:
    mongodb:
      uri: xxxx
      database: xxx
      auto-index-creation: true
@Document(collection = "emb_data")
@CompoundIndexes({
        @CompoundIndex(name = "task_knowledge_manualMark", def = "{'taskId': 1, 'knowledgeId': 1, 'manualMark': 1}")
})
@Accessors(chain = true)
public class EmbData extends AbstractAuditingEntity {

这样做在项目启动后,就可以加入联合索引了,哪怕表已经创建了也是没问题的。

mongodb中已存在了这个联合索引