Method First

cursor.go:35–42

First moves the cursor to the first item in the bucket and returns its key and value. If the bucket is empty then a nil key and value are returned. The returned key and value are only valid for the life of the transaction.

()

// If the bucket is empty then a nil key and value are returned.
// The returned key and value are only valid for the life of the transaction.
func (c *Cursor) First() (key []byte, value []byte) {
	common.Assert(c.bucket.tx.db != nil, "tx closed")
	k, v, flags := c.first()
	if (flags & uint32(common.BucketLeafFlag)) != 0 {
		return k, nil
	}
	return k, v
}

func (c *Cursor) first() (key []byte, value []byte, flags uint32) {
	c.stack = c.stack[:0]