rmongodb (version 1.8.0)

mongo.bson.iterator.type: Get the type of data pointed to by an iterator

Description

Return the type of the field currently pointed to by a mongo.bson.iterator.

Usage

mongo.bson.iterator.type(iter)

Arguments

iter

A mongo.bson.iterator.

Value

(integer) The type of the field pointed to by the iterator as indicated by the following constants:

• mongo.bson.eoo -- End of Object (0L)
• mongo.bson.double
• mongo.bson.string
• mongo.bson.object
• mongo.bson.array
• mongo.bson.binary
• mongo.bson.undefined
• mongo.bson.oid
• mongo.bson.bool
• mongo.bson.date
• mongo.bson.null
• mongo.bson.regex
• mongo.bson.dbref -- deprecated (follow link for more info)
• mongo.bson.code
• mongo.bson.symbol
• mongo.bson.code.w.scope
• mongo.bson.int
• mongo.bson.timestamp
• mongo.bson.long

See Also

mongo.bson.iterator, mongo.bson.iterator.create, mongo.bson.find, mongo.bson.iterator.next, mongo.bson.iterator.key, mongo.bson.iterator.value, mongo.bson.

Examples

buf <- mongo.bson.buffer.create()
# Append a string
mongo.bson.buffer.append(buf, "name", "Joe")
# Append a date/time
mongo.bson.buffer.append(buf, "created", Sys.time())
# Append a NULL
mongo.bson.buffer.append(buf, "cars", NULL)
b <- mongo.bson.from.buffer(buf)

iter <- mongo.bson.iterator.create(b)
while (mongo.bson.iterator.next(iter))
    if (mongo.bson.iterator.type(iter) == mongo.bson.date) {
        print(mongo.bson.iterator.value(iter))
        break
    }

# The above is given for illustrative purposes, but may be performed
# much easier by the following:
iter <- mongo.bson.find(b, "created")
print(mongo.bson.iterator.value(iter))