Query()

This method performs a scalar-filtering query.

func (c *Client) Query(ctx context.Context, option QueryOption, callOptions ...grpc.CallOption) (ResultSet, error)

Request Parameters

Parameter	Description	Type
ctx	Context for the current call to work.	context.Context
option	Optional parameters of the methods.	QueryOption
callOptions	Optional parameters for calling the methods.	grpc.CallOption

QueryOption

This is an interface type. The queryOption struct types implement this interface type.

You can use the NewQueryOption function to get the concrete implementation.

NewQueryOption

The signature of this method is as follows:

func NewQueryOption(collectionName string) *queryOption

Parameter	Description	Type
collectionName	Name of the target collection.	string

ResultSet

This is a struct type. You can use the GetColumn method to get the result values in a specific field.

GetColumn

This method returns the query result in a specific column. The signature is as follows:

func (rs *ResultSet) GetColumn(fieldName string) column.Column

Parameter	Description	Type
fieldName	Name of the target field.	string

Return

ResultSet

Example

rs, err := cli.Query(ctx, milvusclient.NewQueryOption("quick_setup").
    WithFilter("emb_type == 3").
    WithOutputFields("id", "emb_type"))
if err != nil {
    // handle error
}

fmt.Println(rs.GetColumn("id"))