BigObject PolyDB::Collection

from application common

Represents a collection in PolyDB

Core methods for connecting to the database and retrieving metadata.

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get_schema()

Get a JSON validation schema for objects stored in the collection

Returns:

Schema

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Methods to manipulate a given collection.

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add_index(HASH index)

Add an index to a collection

Parameters:

HASH index: definition

Options:

String name: index name

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add_index_from_property(String property)

Add an index to a collection for a property

Parameters:

String property

Options:

Bool ascending: sort documents ascending wrt the property, default true

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add_indices(ARRAY index)

Add many indices to a collection

Parameters:

ARRAY index: definitions

Options:

String name: index name

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add_indices_from_property(ARRAY property)

Add an index to a collection for a property

Parameters:

ARRAY property: names

Options:

Bool ascending: sort documents ascending wrt the property, default true

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indices

list all indices defined for a collection

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insert(Core::BigObject one)

Insert one or more objects into a given collection

Parameters:

Core::BigObject one: or more objects to be inserted to be inserted into the database, or a filename containing an object or an array of objects

Options:

option list insert_options

Returns:

Int

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remove(String id)

Remove one object from a collection identified by its id

Parameters:

String id: the id of the object to remove

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remove_all

Remove all objects from a collection

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set_collection_doc(HASH doc)

Set documentation for a collection

Parameters:

HASH doc: the documentation

Options:

option list doc_options

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set_info(HASH info)

set the info for a new collection

Parameters:

HASH info: the info document

Options:

option list info_options

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set_schema(HASH schema)

set the schema for a new collection

Parameters:

HASH schema: the schema document

Options:

option list schema_options

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Methods that provide query operations for the database or manipulate the result stream of a query.

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count(HASH query)

Return the number of objects satisfying the given search criteria.

Parameters:

HASH query: search criteria written in Mongo query language

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count_distinct(HASH query, String property)

Count the distinct property values in objects satisfying the given search criteria.

Parameters:

HASH query: search criteria for objects to be inspected, written in Mongo query language an empty hash map will collect property values from all objects in this collection

String property: name of the property of interest

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distinct(HASH query, String property)

Retrieve a list of distinct values of a given property. The values are returned in arbitrary order.

Parameters:

HASH query: search criteria for objects to be inspected, written in Mongo query language an empty hash map will collect property values from all objects in this collection

String property: name of the property of interest

Returns:

ARRAY

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find(HASH query)

Retrieve all objects satisfying the given search criteria

Parameters:

HASH query: search criteria written in Mongo query language an empty hash map will retrieve all objects in this collection

Options:

option list cursor_options

Returns:

PolyDB::Cursor

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find_one(HASH query)

Retrieve the first object satisfying the given search criteria.

Parameters:

HASH query: search criteria written in Mongo query language an empty hash map will retrieve a random object from this collection

Options:

option list query_options

Returns:

Core::BigObject

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