mongo.get.prev.err: Retrieve an server error code from a mongo connection object

In jonkatz2/rmongodb: R-MongoDB driver

Description

Retrieve the previous server error record from a the MongoDB server. While this function retrieves an error record in the form of a mongo.bson record, it also sets the values returned by mongo.get.server.err() and mongo.get.server.err.string(). You may find it more convenient using those after calling mongo.get.prev.err() rather than unpacking the returned mongo.bson object.

Usage

mongo.get.prev.err(mongo, db)

Arguments

mongo	(mongo) a mongo connection object.
db	(string) The name of the database for which to get the error status.

Value

NULL if no error was reported; otherwise,

(mongo.bson) This BSON object has the form err : "error message string", code : error code integer

See Also

mongo.get.server.err,
mongo.get.server.err.string,
mongo.get.last.err
mongo.

Examples

mongo <- mongo.create()
if (mongo.is.connected(mongo)) {

    # try adding a duplicate record when index doesn't allow this

    db <- "test"
    ns <- "test.people"
    mongo.index.create(mongo, ns, '{"name":1}', mongo.index.unique)

    buf <- mongo.bson.buffer.create()
    mongo.bson.buffer.append(buf, "name", "John")
    mongo.bson.buffer.append(buf, "age", 22L)
    b <- mongo.bson.from.buffer(buf)
    mongo.insert(mongo, ns, b);

    buf <- mongo.bson.buffer.create()
    mongo.bson.buffer.append(buf, "name", "John")
    mongo.bson.buffer.append(buf, "age", 27L)
    b <- mongo.bson.from.buffer(buf)
    mongo.insert(mongo, ns, b);

    # try insert again
    mongo.insert(mongo, ns, b);

    err <- mongo.get.prev.err(mongo, db)
    print(mongo.get.server.err(mongo))
    print(mongo.get.server.err.string(mongo))
}

jonkatz2/rmongodb documentation built on May 19, 2019, 7:30 p.m.