我们从Python开源项目中，提取了以下35个代码示例，用于说明如何使用copy.source_expressions()。
def as_sql(self, compiler, connection, function=None, template=None, arg_joiner=None, **extra_context): connection.ops.check_expression_support(self) sql_parts = [] params = [] for arg in self.source_expressions: arg_sql, arg_params = compiler.compile(arg) sql_parts.append(arg_sql) params.extend(arg_params) data = self.extra.copy() data.update(**extra_context) # Use the first supplied value in this order: the parameter to this # method, a value supplied in __init__()'s **extra (the value in # `data`), or the value defined on the class. if function is not None: data['function'] = function else: data.setdefault('function', self.function) template = template or data.get('template', self.template) arg_joiner = arg_joiner or data.get('arg_joiner', self.arg_joiner) data['expressions'] = data['field'] = arg_joiner.join(sql_parts) return template % data, params
def __init__(self, *expressions, **extra): output_field = extra.pop('output_field', None) super(Func, self).__init__(output_field=output_field) self.source_expressions = self._parse_expressions(*expressions) self.extra = extra
def __repr__(self): args = self.arg_joiner.join(str(arg) for arg in self.source_expressions) extra = ', '.join(str(key) + '=' + str(val) for key, val in self.extra.items()) if extra: return "{}({}, {})".format(self.__class__.__name__, args, extra) return "{}({})".format(self.__class__.__name__, args)
def set_source_expressions(self, exprs): self.source_expressions = exprs
def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False): c = self.copy() c.is_summary = summarize for pos, arg in enumerate(c.source_expressions): c.source_expressions[pos] = arg.resolve_expression(query, allow_joins, reuse, summarize, for_save) return c
def as_sql(self, compiler, connection, function=None, template=None): connection.ops.check_expression_support(self) sql_parts = [] params = [] for arg in self.source_expressions: arg_sql, arg_params = compiler.compile(arg) sql_parts.append(arg_sql) params.extend(arg_params) if function is None: self.extra['function'] = self.extra.get('function', self.function) else: self.extra['function'] = function self.extra['expressions'] = self.extra['field'] = self.arg_joiner.join(sql_parts) template = template or self.extra.get('template', self.template) return template % self.extra, params
def __init__(self, *expressions, **extra): if self.arity is not None and len(expressions) != self.arity: raise TypeError( "'%s' takes exactly %s %s (%s given)" % ( self.__class__.__name__, self.arity, "argument" if self.arity == 1 else "arguments", len(expressions), ) ) output_field = extra.pop('output_field', None) super(Func, self).__init__(output_field=output_field) self.source_expressions = self._parse_expressions(*expressions) self.extra = extra
