cymple.builder.NodeAvailable

class cymple.builder.NodeAvailable(query)

Bases: Relation, Return, Delete, Where, OperatorStart, OperatorEnd, Set, QueryStartAvailable, Merge, Remove

A class decorator declares a Node is available in the current query.

__init__(query): Initialize the query object.

Methods

`__init__`(query)	Initialize the query object.
`call`()	Concatenate the "CALL" clause.
`create`()	Concatenate the "CREATE" clause.
`cypher`(cypher_query_str)	Concatenate a cypher query string
`delete`(ref_name)	Concatenate a DELETE clause for a referenced instance from the DB.
`detach_delete`(ref_name)	Concatenate a DETACH DELETE clause for a referenced instance from the DB.
`get`()	Get the final query string .
`match`()	Concatenate the "MATCH" clause.
`match_optional`()	Concatenate the "MATCH" clause.
`merge`()	Concatenate the "MERGE" clause.
`operator_end`()	Concatenate the "OPERATOR END" clause.
`operator_start`(operator[, ref_name, args])	Concatenate an operator (e.g. ShortestPath), where its result may be given a name for future reference.
`related`([label, ref_name, properties, ...])	Concatenate an undirectional (i.e. --) graph Relationship, which may be filtered.
`related_from`([label, ref_name, properties, ...])	Concatenate a backward (i.e. <--) graph Relationship, which may be filtered.
`related_to`([label, ref_name, properties, ...])	Concatenate a forward (i.e. -->) graph Relationship, which may be filtered.
`remove`(properties)	Concatenate a remove by statement.
`return_literal`(literal)	Concatenate a literal RETURN statement.
`return_mapping`(mappings)	Concatenate a RETURN statement for multiple objects.
`set`(properties[, escape_values])	Concatenate a SET clause, using the given properties map.
`where`(name, comparison_operator, value, **kwargs)	Concatenate a WHERE clause to the query, created as {name} {comparison_operator} {value}.
`where_literal`(statement, **kwargs)	Concatenate a literal WHERE clause to the query.
`where_multiple`(filters[, ...])	Concatenate a WHERE clause to the query, created from a list of given property filters.
`with_`(variables)	Concatenate a WITH clause, keeping one or more variables given in 'variables' arg.

call()

Concatenate the “CALL” clause.

Returns:: A Query object with a query that contains the new clause.
Return type:: CallAvailable

create()

Concatenate the “CREATE” clause.

Returns:: A Query object with a query that contains the new clause.
Return type:: CreateAvailable

cypher(cypher_query_str): Concatenate a cypher query string

delete(ref_name: str)

Concatenate a DELETE clause for a referenced instance from the DB.

Parameters:: ref_name (str) – The reference name to be used for the delete operation
Returns:: A Query object with a query that contains the new clause.
Return type:: DeleteAvailable

detach_delete(ref_name: str)

Concatenate a DETACH DELETE clause for a referenced instance from the DB.

Parameters:: ref_name (str) – The reference name to be used for the delete operation
Returns:: A Query object with a query that contains the new clause.
Return type:: DeleteAvailable

get(): Get the final query string .

match()

Concatenate the “MATCH” clause.

Returns:: A Query object with a query that contains the new clause.
Return type:: MatchAvailable

match_optional()

Concatenate the “MATCH” clause.

Returns:: A Query object with a query that contains the new clause.
Return type:: MatchAvailable

merge()

Concatenate the “MERGE” clause.

Returns:: A Query object with a query that contains the new clause.
Return type:: MergeAvailable

operator_end()

Concatenate the “OPERATOR END” clause.

Returns:: A Query object with a query that contains the new clause.
Return type:: OperatorEndAvailable

operator_start(operator: str, ref_name: str | None = None, args: dict | None = None)

Concatenate an operator (e.g. ShortestPath), where its result may be given a name for future reference.

Parameters:

operator (str) – The neo4j operator to be used (e.g. ShortestPath)
ref_name (str) – A reference name of the result, to be used later in the rest of the query, defaults to None
args (dict) – A dict of arguments, to be passed to the operator function, defaults to None

Returns:

A Query object with a query that contains the new clause.

Return type:

OperatorStartAvailable

related(label: str | None = None, ref_name: str | None = None, properties: dict | None = None, min_hops: int = 1, max_hops: int = 1, **kwargs)

Concatenate an undirectional (i.e. –) graph Relationship, which may be filtered.

Parameters:

label (str) – The relationship label (type) in the DB, defaults to None
ref_name (str) – A reference name to be used later in the rest of the query, defaults to None
properties (dict) – A dict representing the set of properties by which the relationship is filtered, defaults to None
min_hops (int) – The minimal desired number of hops (set -1 for maximum boundary only), defaults to 1
max_hops (int) – The maximal desired number of hops (set -1 for minimal boundary only), defaults to 1
**kwargs –
kwargs

:type **kwargs

Returns:: A Query object with a query that contains the new clause.
Return type:: RelationAvailable

related_from(label: str | None = None, ref_name: str | None = None, properties: dict = {}, min_hops: int = 1, max_hops: int = 1, **kwargs)

Concatenate a backward (i.e. <–) graph Relationship, which may be filtered.

Parameters:

label (str) – The relationship label (type) in the DB, defaults to None
ref_name (str) – A reference name to be used later in the rest of the query, defaults to None
properties (dict) – A dict representing the set of properties by which the relationship is filtered, defaults to {}
min_hops (int) – The minimal desired number of hops (set -1 for maximum boundary only), defaults to 1
max_hops (int) – The maximal desired number of hops (set -1 for minimal boundary only), defaults to 1
**kwargs –
kwargs

:type **kwargs

Returns:: A Query object with a query that contains the new clause.
Return type:: RelationAvailable

related_to(label: str | None = None, ref_name: str | None = None, properties: dict = {}, min_hops: int = 1, max_hops: int = 1, **kwargs)

Concatenate a forward (i.e. –>) graph Relationship, which may be filtered.

Parameters:

label (str) – The relationship label (type) in the DB, defaults to None
ref_name (str) – A reference name to be used later in the rest of the query, defaults to None
properties (dict) – A dict representing the set of properties by which the relationship is filtered, defaults to {}
min_hops (int) – The minimal desired number of hops (set -1 for maximum boundary only), defaults to 1
max_hops (int) – The maximal desired number of hops (set -1 for minimal boundary only), defaults to 1
**kwargs –
kwargs

:type **kwargs

Returns:: A Query object with a query that contains the new clause.
Return type:: RelationAvailable

remove(properties: str | List[str])

Concatenate a remove by statement.

Parameters:: properties (Union[str, List[str]]) – A string or a list of strings representing the properties to remove.
Returns:: A Query object with a query that contains the new clause.
Return type:: RemoveAvailable

return_literal(literal: str)

Concatenate a literal RETURN statement.

Parameters:: literal (str) – A Cypher string describing the objects to be returned, referencing name/names which were defined earlier in the query
Returns:: A Query object with a query that contains the new clause.
Return type:: ReturnAvailable

return_mapping(mappings: List[Mapping])

Concatenate a RETURN statement for multiple objects.

Parameters:: mappings (List[Mapping]) – The mapping (or a list of mappings) of db property names to code names, to be returned
Returns:: A Query object with a query that contains the new clause.
Return type:: ReturnAvailable

set(properties: dict, escape_values: bool = True)

Concatenate a SET clause, using the given properties map.

Parameters:

properties (dict) – A dict to be used to set the variables with their corresponding values
escape_values (bool) – Determines whether the properties values should be escaped or not, defaults to True

Returns:

A Query object with a query that contains the new clause.

Return type:

SetAvailable

where(name: str, comparison_operator: str, value: str, **kwargs)

Concatenate a WHERE clause to the query, created as {name} {comparison_operator} {value}. E.g. x = ‘abc’.

Parameters:

name (str) – The name of the object which is to be used in the comparison
comparison_operator (str) – A string operator, according to which the comparison between compared object and the {value} is done, e.g. for “=”, we get: {name} = {value}
value (str) – The value which is compared against
**kwargs –
kwargs

:type **kwargs

Returns:: A Query object with a query that contains the new clause.
Return type:: WhereAvailable

where_literal(statement: str, **kwargs)

Concatenate a literal WHERE clause to the query.

Parameters:

statement (str) – A literal string of the required filter
**kwargs –
kwargs

:type **kwargs

Returns:: A Query object with a query that contains the new clause.
Return type:: WhereAvailable

where_multiple(filters: dict, comparison_operator: str = '=', boolean_operator: str = ' AND ', **kwargs)

Concatenate a WHERE clause to the query, created from a list of given property filters.

Parameters:

filters (dict) – A dict representing the set of properties to be filtered
comparison_operator (str) – A string operator, according to which the comparison between property values is done, e.g. for “=”, we get: property.name = property.value, defaults to “=”
boolean_operator (str) – The boolean operator to apply between predicates, defaults to ‘ AND ‘
**kwargs –
kwargs

:type **kwargs

Returns:: A Query object with a query that contains the new clause.
Return type:: WhereAvailable

with_(variables: str)

Concatenate a WITH clause, keeping one or more variables given in ‘variables’ arg.

Parameters:: variables (str) – A string refering to previously obtained variables, comma seperated
Returns:: A Query object with a query that contains the new clause.
Return type:: WithAvailable