query

Spec

async query(
    tnmInput: TynamoQueryInput<TSource>
): Promise<TynamoQueryOutput<TSource>>

Input

export interface TynamoQueryInput<TSource> {
    ExclusiveStartKey?: TSource;
    ExpressionAttributeValues?: any;

    // Derived from DynamoDB.
    IndexName?: IndexName;
    Select?: Select;
    Limit?: PositiveIntegerObject;
    ConsistentRead?: ConsistentRead;
    ScanIndexForward?: BooleanObject;
    ReturnConsumedCapacity?: ReturnConsumedCapacity;
    ProjectionExpression?: ProjectionExpression;
    FilterExpression?: ConditionExpression;
    KeyConditionExpression?: KeyExpression;
    ExpressionAttributeNames?: ExpressionAttributeNameMap;
}

Name	Type	Info
ExclusiveStartKey	@DynamoEntity	The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey in the previous operation.
ExpressionAttributeValues	@DynamoEntity	Value used for expression.

Unlisted param is derived from DynamoDB.

Check here for more information.

Output

export interface TynamoQueryOutput<TSource> {
    Items?: TSource[];
    LastEvaluatedKey?: TSource;

    // Derived from DynamoDB.
    $response: AWS.Response<QueryOutput, AWS.AWSError>;
    Count?: Integer;
    ScannedCount?: Integer;
    ConsumedCapacity?: ConsumedCapacity;
}

Name	Type	Info
Items	@DynamoEntity[]	Result of query operation.
LastEvaluatedKey	@DynamoEntity	Primary key of the last item.

Unlisted param is derived from DynamoDB.

Check here for more information.

Example

@DynamoEntity()
class Cat {
    @DynamoProperty({ keyType: KeyType.hash })
    id!: number;

    @DynamoProperty({ keyType: KeyType.attr })
    name!: string;

    constructor(id: number, name: string) {
        this.id = id;
        this.name = name;
    }
}

@DynamoEntity()
class Args {
    @DynamoProperty({ keyType: KeyType.hash })
    prefix!: string;
    
    constructor(prefix: string){
        this.prefix= prefix;
    }
}

const tynamo: Tynamo = new Tynamo({
    region: "ap-northeast-2",
    endpoint: "http://localhost:8000"
});
const tynamoTable = tynamo.getTableOf(Cat);


await tynamoTable.query({
    FilterExpression: "begins_with(#name, :prefix)",
    ExpressionAttributeValues: new Args("gar"),
    ProjectionExpression: "#id, #name"
});