本文整理匯總了Golang中github.com/couchbaselabs/query/value.Value.GetAttachment方法的典型用法代碼示例。如果您正苦於以下問題：Golang Value.GetAttachment方法的具體用法？Golang Value.GetAttachment怎麽用？Golang Value.GetAttachment使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類github.com/couchbaselabs/query/value.Value的用法示例。
在下文中一共展示了Value.GetAttachment方法的3個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。
示例1: Apply
/*
This method takes in an operand value and context and returns a value.
If the type of operand is missing then return it. If the operand
type is AnnotatedValue then we call NewValue using the GetAttachment
method on the operand with input string meta. In the event the there
is no attachment present, the default case is to return a NULL value.
*/
func (this *Meta) Apply(context Context, operand value.Value) (value.Value, error) {
if operand.Type() == value.MISSING {
return operand, nil
}
switch operand := operand.(type) {
case value.AnnotatedValue:
return value.NewValue(operand.GetAttachment("meta")), nil
default:
return value.NULL_VALUE, nil
}
}示例2: getSet
/*
Retrieve the set for annotated values. If the attachment type
is not a set, then throw an invalid distinct set error and
return.
*/
func getSet(item value.Value) (*value.Set, error) {
switch item := item.(type) {
case value.AnnotatedValue:
ps := item.GetAttachment("set")
switch ps := ps.(type) {
case *value.Set:
return ps, nil
default:
return nil, fmt.Errorf("Invalid DISTINCT set %v of type %T.", ps, ps)
}
default:
return nil, fmt.Errorf("Invalid DISTINCT %v of type %T.", item, item)
}
}示例3: Evaluate
/*
Directly call the evaluate method for aggregate functions and
passe in the receiver, current item and current context, for
count with an input expression operand. For a count with no
operands (count (*)), get the count from the attachment and
then evaluate.
*/
func (this *Count) Evaluate(item value.Value, context expression.Context) (result value.Value, e error) {
if this.Operand() != nil {
return this.evaluate(this, item, context)
}
// Full keyspace count is short-circuited
switch item := item.(type) {
case value.AnnotatedValue:
count := item.GetAttachment("count")
if count != nil {
return value.NewValue(count), nil
}
}
return this.evaluate(this, item, context)
}