django.db.models.sql.where.WhereNode

class documentation

class WhereNode(tree.Node):

An SQL WHERE clause.

The class is tied to the Query class that created it (in order to create the correct SQL).

A child is usually an expression producing boolean values. Most likely the expression is a Lookup instance.

However, a child could also be any class with as_sql() and either relabeled_clone() method or relabel_aliases() and clone() methods and contains_aggregate attribute.

Class Method	`_contains_aggregate`	Undocumented
Class Method	`_contains_over_clause`	Undocumented
Class Method	`_resolve_node`	Undocumented
Static Method	`_resolve_leaf`	Undocumented
Method	`as_sql`	No summary
Method	`clone`	Create a clone of the tree. Must only be called on root nodes (nodes with empty subtree_parents). Childs must be either (Constraint, lookup, value) tuples, or objects supporting .clone().
Method	`copy`	Undocumented
Method	`get_db_converters`	Undocumented
Method	`get_group_by_cols`	Undocumented
Method	`get_lookup`	Undocumented
Method	`get_source_expressions`	Undocumented
Method	`relabel_aliases`	Relabel the alias values of any children. 'change_map' is a dictionary mapping old (current) alias values to the new values.
Method	`relabeled_clone`	Undocumented
Method	`resolve_expression`	Undocumented
Method	`select_format`	Undocumented
Method	`set_source_expressions`	Undocumented
Method	`split_having`	Return two possibly None nodes: one for those parts of self that should be included in the WHERE clause and one for those parts of self that must be included in the HAVING clause.
Class Variable	`conditional`	Undocumented
Class Variable	`resolved`	Undocumented
Instance Variable	`children`	Undocumented
Property	`contains_aggregate`	Undocumented
Property	`contains_over_clause`	Undocumented
Property	`output_field`	Undocumented

Inherited from Node:

Class Method	`_new_instance`	No summary
Method	`__bool__`	Return whether or not this node has children.
Method	`__contains__`	Return True if 'other' is a direct child of this instance.
Method	`__deepcopy__`	Undocumented
Method	`__eq__`	Undocumented
Method	`__hash__`	Undocumented
Method	`__init__`	Construct a new Node. If no connector is given, use the default.
Method	`__len__`	Return the number of children this node has.
Method	`__repr__`	Undocumented
Method	`__str__`	Undocumented
Method	`add`	Combine this tree and the data represented by data using the connector conn_type. The combine is done by squashing the node other away if possible.
Method	`negate`	Negate the sense of the root connector.
Class Variable	`default`	Undocumented
Instance Variable	`connector`	Undocumented
Instance Variable	`negated`	Undocumented

@classmethod
def _contains_aggregate(cls, obj):

Undocumented

@classmethod
def _contains_over_clause(cls, obj):

Undocumented

@classmethod
def _resolve_node(cls, node, query, *args, **kwargs):

Undocumented

@staticmethod
def _resolve_leaf(expr, query, *args, **kwargs):

Undocumented

def as_sql(self, compiler, connection):

Return the SQL version of the where clause and the value to be substituted in. Return '', [] if this node matches everything, None, [] if this node is empty, and raise EmptyResultSet if this node can't match anything.

def clone(self):

Create a clone of the tree. Must only be called on root nodes (nodes with empty subtree_parents). Childs must be either (Constraint, lookup, value) tuples, or objects supporting .clone().

def copy(self):

Undocumented

def get_db_converters(self, connection):

Undocumented

def get_group_by_cols(self, alias=None):

Undocumented

def get_lookup(self, lookup):

Undocumented

def get_source_expressions(self):

Undocumented

def relabel_aliases(self, change_map):

Relabel the alias values of any children. 'change_map' is a dictionary mapping old (current) alias values to the new values.

def relabeled_clone(self, change_map):

Undocumented

def resolve_expression(self, *args, **kwargs):

Undocumented

def select_format(self, compiler, sql, params):

Undocumented

def set_source_expressions(self, children):

Undocumented

def split_having(self, negated=False):

Return two possibly None nodes: one for those parts of self that should be included in the WHERE clause and one for those parts of self that must be included in the HAVING clause.

conditional: bool =

Undocumented

resolved: bool =

Undocumented

children =

overrides django.utils.tree.Node.children

Undocumented

@cached_property
contains_aggregate =

Undocumented

@cached_property
contains_over_clause =

Undocumented

@cached_property
output_field =

Undocumented