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  • Java

describeCollection()

A MilvusClient interface. This method shows the details of a collection, e.g. name, schema.

R<DescribeCollectionResponse> describeCollection(DescribeCollectionParam requestParam);

DescribeCollectionParam

Use the DescribeCollectionParam.Builder to construct a DescribeCollectionParam object.

import io.milvus.param.DescribeCollectionParam;
DescribeCollectionParam.Builder builder = DescribeCollectionParam.newBuilder();

Methods of DescribeCollectionParam.Builder:

Method

Description

Parameters

withCollectionName(String collectionName)

Sets the collection name. Collection name cannot be empty or null.

collectionName: The name of the collection to release.

withDatabaseName(String databaseName)

Sets the database name. database name can be null for default database.

databaseName: The database name.

build()

Constructs a ReleaseCollectionParam object.

N/A

The DescribeCollectionParam.Builder.build() can throw the following exceptions:

  • ParamException: error if the parameter is invalid.

Returns

This method catches all the exceptions and returns an R<DescribeCollectionResponse> object.

  • If the API fails on the server side, it returns the error code and message from the server.

  • If the API fails by RPC exception, it returns R.Status.Unknown and the error message of the exception.

  • If the API succeeds, it returns a valid DescribeCollectionResponse held by the R template. You can use DescCollResponseWrapper to get the information.

DescCollResponseWrapper

A tool class to encapsulate the DescribeCollectionResponse.

import io.milvus.response.DescCollResponseWrapper;
DescCollResponseWrapper wrapper = new DescCollResponseWrapper(response);

Methods of DescCollResponseWrapper:

Method

Description

Parameters

Returns

getCollectionName()

Get the name of the collection.

N/A

String

getCollectionDescription()

Get the description of the collection.

N/A

String

getCollectionID()

Get the internal ID of the collection.

N/A

long

getShardNumber()

Get the shard number of the collection.

N/A

int

getCreatedUtcTimestamp()

Get UTC timestamp when the collection is created.

N/A

long

getAliases()

Get aliases of the collection.

N/A

List<String>

getFields()

Get the schema of the collection's fields.

N/A

List<FieldType>

getFieldByName(String fieldName)

Get the schema of a field by name.Return null if the field doesn't exist.

fieldName: The name of a field

FieldType

isDynamicFieldEnabled()

Get whether the collection dynamic field is enabled

N/A

boolean

getPartitionKeyField()

Get the partition key field.Return null if the partition key field doesn't exist.

N/A

FieldType

Example

import io.milvus.param.*;
import io.milvus.response.DescCollResponseWrapper;

DescribeCollectionParam param = DescribeCollectionParam.newBuilder()
        .withCollectionName(COLLECTION_NAME)
        .build();
R<DescribeCollectionResponse> response = client.describeCollection(param);
if (response.getStatus() != R.Status.Success.getCode()) {
    System.out.println(response.getMessage());
}
DescCollResponseWrapper wrapper = new DescCollResponseWrapper(response.getData());
System.out.println("Shard number: " + wrapper.getShardNumber());
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