query()

Queries entities by primary key or filter, with optional ordering through orderByFields.

public QueryResp query(QueryReq request)

Request Syntax

// include-start milvus
QueryReq.builder()
    .databaseName(databaseName)
    .collectionName(collectionName)
    .partitionNames(partitionNames)
    .outputFields(outputFields)
    .ids(ids)
    .filter(filter)
    .consistencyLevel(consistencyLevel)
    .offset(offset)
    .limit(limit)
    .ignoreGrowing(ignoreGrowing)
    .timezone(timezone)
    .orderByFields(orderByFields)
    .queryParams(queryParams)
    .filterTemplateValues(filterTemplateValues)
    .build();
// include-end
// include-start zilliz
QueryReq.builder()
    .databaseName(databaseName)
    .collectionName(collectionName)
    .clusterId(clusterId)
    .partitionNames(partitionNames)
    .outputFields(outputFields)
    .ids(ids)
    .filter(filter)
    .consistencyLevel(consistencyLevel)
    .offset(offset)
    .limit(limit)
    .ignoreGrowing(ignoreGrowing)
    .timezone(timezone)
    .orderByFields(orderByFields)
    .queryParams(queryParams)
    .filterTemplateValues(filterTemplateValues)
    .build();
// include-end

BUILDER METHODS:

• databaseName(String databaseName)

  The name of the database. Defaults to the current database when omitted.

• collectionName(String collectionName)

  The name of the target collection.

• partitionNames(List<String> partitionNames)

  The partitions to query.

• outputFields(List<String> outputFields)

  The fields to include in each returned row.

• ids(List<Object> ids)

  Primary-key values to query.

• filter(String filter)

  A scalar filtering expression.

• consistencyLevel(ConsistencyLevel consistencyLevel)

  The consistency level for the query.

• offset(long offset)

  The number of matching rows to skip.

• limit(long limit)

  The maximum number of rows to return.

• ignoreGrowing(boolean ignoreGrowing)

  Whether to ignore growing segments.

• timezone(String timezone)

  The timezone used to interpret temporal expressions.

• orderByFields(List<OrderByField> orderByFields)

  The scalar fields and directions used to order matching rows.

• queryParams(Map<String, Object> queryParams)

  Additional query parameters.

• filterTemplateValues(Map<String, Object> filterTemplateValues)

  Values substituted into placeholders in the filter expression.

RETURNS:

QueryResp

Contains query rows ordered according to orderByFields when provided.

EXCEPTIONS:

• MilvusClientException

  Raised when request validation, transport, or server execution fails. Inspect the exception message for the exact failure reason.

Example

Demonstrates query() against Milvus.

// include-start milvus
QueryResp response = client.query(QueryReq.builder()
    .collectionName("books")
    .orderByFields(Collections.singletonList(OrderByField.builder()
        .fieldName("published_year")
        .direction(AggDirection.DESC)
        .build()))
    .limit(10)
    .build());
// include-end
// include-start zilliz
QueryResp response = client.query(QueryReq.builder()
    .collectionName("books")
    .clusterId(CLUSTER_ID)
    .orderByFields(Collections.singletonList(OrderByField.builder()
        .fieldName("published_year")
        .direction(AggDirection.DESC)
        .build()))
    .limit(10)
    .build());
// include-end