Tablestore:Gunakan kolom virtual

Buat kolom virtual

Contoh berikut memetakan bidang sumber bertipe Keyword category ke kolom virtual bertipe Long, serta bidang sumber bertipe Long price ke kolom virtual bertipe Keyword.

String tableName = "example_table";
String indexName = "example_index";
IndexSchema indexSchema = new IndexSchema();
indexSchema.setFieldSchemas(Arrays.asList(
        new FieldSchema("category", FieldType.KEYWORD),
        new FieldSchema("category_as_long", FieldType.LONG)
                .setVirtualField(true)
                .setSourceFieldName("category"),
        new FieldSchema("price", FieldType.LONG),
        new FieldSchema("price_as_keyword", FieldType.KEYWORD)
                .setVirtualField(true)
                .setSourceFieldName("price")));

CreateSearchIndexRequest request = new CreateSearchIndexRequest();
request.setTableName(tableName);
request.setIndexName(indexName);
request.setIndexSchema(indexSchema);
client.createSearchIndex(request);

Setelah permintaan berhasil, tunggu hingga indeks pencarian selesai menyinkronkan data sebelum menjalankan kueri.

Lakukan kueri data dengan kolom virtual

Contoh berikut melakukan kueri terhadap baris-baris yang nilai kolom virtual price_as_keyword-nya sama dengan string 1000, serta mengembalikan kolom dari tabel sumber.

String tableName = "example_table";
String indexName = "example_index";
TermsQuery query = new TermsQuery();
query.setFieldName("price_as_keyword");
query.addTerm(ColumnValue.fromString("1000"));

SearchQuery searchQuery = new SearchQuery();
searchQuery.setQuery(query);
searchQuery.setGetTotalCount(true);

SearchRequest request = new SearchRequest(tableName, indexName, searchQuery);
SearchRequest.ColumnsToGet columnsToGet = new SearchRequest.ColumnsToGet();
columnsToGet.setReturnAll(true);
request.setColumnsToGet(columnsToGet);

SearchResponse response = client.search(request);
System.out.println(response.getTotalCount());
System.out.println(response.getRows());