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78 lines
2.0 KiB
78 lines
2.0 KiB
/*
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Copyright 2020 The Qmgo Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package qmgo
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import (
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"context"
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"go.mongodb.org/mongo-driver/mongo"
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)
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// Cursor struct define
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type Cursor struct {
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ctx context.Context
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cursor *mongo.Cursor
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err error
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}
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// Next gets the next document for this cursor. It returns true if there were no errors and the cursor has not been
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// exhausted.
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func (c *Cursor) Next(result interface{}) bool {
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if c.err != nil {
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return false
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}
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var err error
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if c.cursor.Next(c.ctx) {
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err = c.cursor.Decode(result)
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if err == nil {
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return true
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}
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}
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return false
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}
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// All iterates the cursor and decodes each document into results. The results parameter must be a pointer to a slice.
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// recommend to use All() in struct Query or Aggregate
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func (c *Cursor) All(results interface{}) error {
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if c.err != nil {
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return c.err
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}
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return c.cursor.All(c.ctx, results)
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}
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// ID returns the ID of this cursor, or 0 if the cursor has been closed or exhausted.
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//func (c *Cursor) ID() int64 {
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// if c.err != nil {
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// return 0
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// }
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// return c.cursor.ID()
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//}
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// Close closes this cursor. Next and TryNext must not be called after Close has been called.
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// When the cursor object is no longer in use, it should be actively closed
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func (c *Cursor) Close() error {
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if c.err != nil {
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return c.err
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}
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return c.cursor.Close(c.ctx)
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}
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// Err return the last error of Cursor, if no error occurs, return nil
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func (c *Cursor) Err() error {
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if c.err != nil {
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return c.err
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}
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return c.cursor.Err()
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}
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