818 lines
18 KiB
Go
818 lines
18 KiB
Go
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package bolt_test
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"log"
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"os"
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"reflect"
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"sort"
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"testing"
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"testing/quick"
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"github.com/boltdb/bolt"
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)
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// Ensure that a cursor can return a reference to the bucket that created it.
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func TestCursor_Bucket(t *testing.T) {
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db := MustOpenDB()
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defer db.MustClose()
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if err := db.Update(func(tx *bolt.Tx) error {
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b, err := tx.CreateBucket([]byte("widgets"))
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if err != nil {
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t.Fatal(err)
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}
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if cb := b.Cursor().Bucket(); !reflect.DeepEqual(cb, b) {
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t.Fatal("cursor bucket mismatch")
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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}
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// Ensure that a Tx cursor can seek to the appropriate keys.
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func TestCursor_Seek(t *testing.T) {
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db := MustOpenDB()
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defer db.MustClose()
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if err := db.Update(func(tx *bolt.Tx) error {
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b, err := tx.CreateBucket([]byte("widgets"))
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if err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("foo"), []byte("0001")); err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("bar"), []byte("0002")); err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("baz"), []byte("0003")); err != nil {
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t.Fatal(err)
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}
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if _, err := b.CreateBucket([]byte("bkt")); err != nil {
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t.Fatal(err)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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if err := db.View(func(tx *bolt.Tx) error {
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c := tx.Bucket([]byte("widgets")).Cursor()
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// Exact match should go to the key.
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if k, v := c.Seek([]byte("bar")); !bytes.Equal(k, []byte("bar")) {
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t.Fatalf("unexpected key: %v", k)
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} else if !bytes.Equal(v, []byte("0002")) {
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t.Fatalf("unexpected value: %v", v)
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}
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// Inexact match should go to the next key.
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if k, v := c.Seek([]byte("bas")); !bytes.Equal(k, []byte("baz")) {
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t.Fatalf("unexpected key: %v", k)
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} else if !bytes.Equal(v, []byte("0003")) {
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t.Fatalf("unexpected value: %v", v)
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}
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// Low key should go to the first key.
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if k, v := c.Seek([]byte("")); !bytes.Equal(k, []byte("bar")) {
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t.Fatalf("unexpected key: %v", k)
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} else if !bytes.Equal(v, []byte("0002")) {
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t.Fatalf("unexpected value: %v", v)
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}
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// High key should return no key.
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if k, v := c.Seek([]byte("zzz")); k != nil {
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t.Fatalf("expected nil key: %v", k)
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} else if v != nil {
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t.Fatalf("expected nil value: %v", v)
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}
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// Buckets should return their key but no value.
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if k, v := c.Seek([]byte("bkt")); !bytes.Equal(k, []byte("bkt")) {
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t.Fatalf("unexpected key: %v", k)
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} else if v != nil {
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t.Fatalf("expected nil value: %v", v)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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}
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func TestCursor_Delete(t *testing.T) {
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db := MustOpenDB()
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defer db.MustClose()
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const count = 1000
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// Insert every other key between 0 and $count.
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if err := db.Update(func(tx *bolt.Tx) error {
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b, err := tx.CreateBucket([]byte("widgets"))
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if err != nil {
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t.Fatal(err)
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}
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for i := 0; i < count; i += 1 {
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k := make([]byte, 8)
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binary.BigEndian.PutUint64(k, uint64(i))
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if err := b.Put(k, make([]byte, 100)); err != nil {
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t.Fatal(err)
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}
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}
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if _, err := b.CreateBucket([]byte("sub")); err != nil {
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t.Fatal(err)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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if err := db.Update(func(tx *bolt.Tx) error {
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c := tx.Bucket([]byte("widgets")).Cursor()
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bound := make([]byte, 8)
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binary.BigEndian.PutUint64(bound, uint64(count/2))
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for key, _ := c.First(); bytes.Compare(key, bound) < 0; key, _ = c.Next() {
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if err := c.Delete(); err != nil {
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t.Fatal(err)
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}
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}
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c.Seek([]byte("sub"))
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if err := c.Delete(); err != bolt.ErrIncompatibleValue {
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t.Fatalf("unexpected error: %s", err)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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if err := db.View(func(tx *bolt.Tx) error {
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stats := tx.Bucket([]byte("widgets")).Stats()
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if stats.KeyN != count/2+1 {
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t.Fatalf("unexpected KeyN: %d", stats.KeyN)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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}
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// Ensure that a Tx cursor can seek to the appropriate keys when there are a
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// large number of keys. This test also checks that seek will always move
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// forward to the next key.
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//
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// Related: https://github.com/boltdb/bolt/pull/187
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func TestCursor_Seek_Large(t *testing.T) {
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db := MustOpenDB()
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defer db.MustClose()
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var count = 10000
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// Insert every other key between 0 and $count.
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if err := db.Update(func(tx *bolt.Tx) error {
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b, err := tx.CreateBucket([]byte("widgets"))
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if err != nil {
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t.Fatal(err)
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}
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for i := 0; i < count; i += 100 {
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for j := i; j < i+100; j += 2 {
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k := make([]byte, 8)
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binary.BigEndian.PutUint64(k, uint64(j))
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if err := b.Put(k, make([]byte, 100)); err != nil {
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t.Fatal(err)
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}
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}
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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if err := db.View(func(tx *bolt.Tx) error {
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c := tx.Bucket([]byte("widgets")).Cursor()
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for i := 0; i < count; i++ {
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seek := make([]byte, 8)
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binary.BigEndian.PutUint64(seek, uint64(i))
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k, _ := c.Seek(seek)
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// The last seek is beyond the end of the the range so
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// it should return nil.
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if i == count-1 {
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if k != nil {
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t.Fatal("expected nil key")
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}
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continue
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}
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// Otherwise we should seek to the exact key or the next key.
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num := binary.BigEndian.Uint64(k)
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if i%2 == 0 {
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if num != uint64(i) {
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t.Fatalf("unexpected num: %d", num)
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}
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} else {
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if num != uint64(i+1) {
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t.Fatalf("unexpected num: %d", num)
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}
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}
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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}
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// Ensure that a cursor can iterate over an empty bucket without error.
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func TestCursor_EmptyBucket(t *testing.T) {
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db := MustOpenDB()
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defer db.MustClose()
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if err := db.Update(func(tx *bolt.Tx) error {
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_, err := tx.CreateBucket([]byte("widgets"))
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return err
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}); err != nil {
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t.Fatal(err)
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}
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if err := db.View(func(tx *bolt.Tx) error {
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c := tx.Bucket([]byte("widgets")).Cursor()
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k, v := c.First()
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if k != nil {
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t.Fatalf("unexpected key: %v", k)
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} else if v != nil {
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t.Fatalf("unexpected value: %v", v)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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}
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// Ensure that a Tx cursor can reverse iterate over an empty bucket without error.
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func TestCursor_EmptyBucketReverse(t *testing.T) {
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db := MustOpenDB()
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defer db.MustClose()
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if err := db.Update(func(tx *bolt.Tx) error {
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_, err := tx.CreateBucket([]byte("widgets"))
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return err
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}); err != nil {
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t.Fatal(err)
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}
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if err := db.View(func(tx *bolt.Tx) error {
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c := tx.Bucket([]byte("widgets")).Cursor()
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k, v := c.Last()
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if k != nil {
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t.Fatalf("unexpected key: %v", k)
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} else if v != nil {
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t.Fatalf("unexpected value: %v", v)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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}
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// Ensure that a Tx cursor can iterate over a single root with a couple elements.
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func TestCursor_Iterate_Leaf(t *testing.T) {
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db := MustOpenDB()
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defer db.MustClose()
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if err := db.Update(func(tx *bolt.Tx) error {
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b, err := tx.CreateBucket([]byte("widgets"))
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if err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("baz"), []byte{}); err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("foo"), []byte{0}); err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("bar"), []byte{1}); err != nil {
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t.Fatal(err)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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tx, err := db.Begin(false)
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if err != nil {
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t.Fatal(err)
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}
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defer func() { _ = tx.Rollback() }()
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c := tx.Bucket([]byte("widgets")).Cursor()
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k, v := c.First()
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if !bytes.Equal(k, []byte("bar")) {
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t.Fatalf("unexpected key: %v", k)
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} else if !bytes.Equal(v, []byte{1}) {
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t.Fatalf("unexpected value: %v", v)
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}
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k, v = c.Next()
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if !bytes.Equal(k, []byte("baz")) {
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t.Fatalf("unexpected key: %v", k)
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} else if !bytes.Equal(v, []byte{}) {
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t.Fatalf("unexpected value: %v", v)
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}
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k, v = c.Next()
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if !bytes.Equal(k, []byte("foo")) {
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t.Fatalf("unexpected key: %v", k)
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} else if !bytes.Equal(v, []byte{0}) {
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t.Fatalf("unexpected value: %v", v)
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}
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k, v = c.Next()
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if k != nil {
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t.Fatalf("expected nil key: %v", k)
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} else if v != nil {
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t.Fatalf("expected nil value: %v", v)
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}
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k, v = c.Next()
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if k != nil {
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t.Fatalf("expected nil key: %v", k)
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} else if v != nil {
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t.Fatalf("expected nil value: %v", v)
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}
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if err := tx.Rollback(); err != nil {
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t.Fatal(err)
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}
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}
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// Ensure that a Tx cursor can iterate in reverse over a single root with a couple elements.
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func TestCursor_LeafRootReverse(t *testing.T) {
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db := MustOpenDB()
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defer db.MustClose()
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if err := db.Update(func(tx *bolt.Tx) error {
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b, err := tx.CreateBucket([]byte("widgets"))
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if err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("baz"), []byte{}); err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("foo"), []byte{0}); err != nil {
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t.Fatal(err)
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}
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if err := b.Put([]byte("bar"), []byte{1}); err != nil {
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t.Fatal(err)
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}
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return nil
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}); err != nil {
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t.Fatal(err)
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}
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tx, err := db.Begin(false)
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if err != nil {
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t.Fatal(err)
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}
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c := tx.Bucket([]byte("widgets")).Cursor()
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if k, v := c.Last(); !bytes.Equal(k, []byte("foo")) {
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t.Fatalf("unexpected key: %v", k)
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} else if !bytes.Equal(v, []byte{0}) {
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||
|
|
t.Fatalf("unexpected value: %v", v)
|
||
|
|
}
|
||
|
|
|
||
|
|
if k, v := c.Prev(); !bytes.Equal(k, []byte("baz")) {
|
||
|
|
t.Fatalf("unexpected key: %v", k)
|
||
|
|
} else if !bytes.Equal(v, []byte{}) {
|
||
|
|
t.Fatalf("unexpected value: %v", v)
|
||
|
|
}
|
||
|
|
|
||
|
|
if k, v := c.Prev(); !bytes.Equal(k, []byte("bar")) {
|
||
|
|
t.Fatalf("unexpected key: %v", k)
|
||
|
|
} else if !bytes.Equal(v, []byte{1}) {
|
||
|
|
t.Fatalf("unexpected value: %v", v)
|
||
|
|
}
|
||
|
|
|
||
|
|
if k, v := c.Prev(); k != nil {
|
||
|
|
t.Fatalf("expected nil key: %v", k)
|
||
|
|
} else if v != nil {
|
||
|
|
t.Fatalf("expected nil value: %v", v)
|
||
|
|
}
|
||
|
|
|
||
|
|
if k, v := c.Prev(); k != nil {
|
||
|
|
t.Fatalf("expected nil key: %v", k)
|
||
|
|
} else if v != nil {
|
||
|
|
t.Fatalf("expected nil value: %v", v)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := tx.Rollback(); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ensure that a Tx cursor can restart from the beginning.
|
||
|
|
func TestCursor_Restart(t *testing.T) {
|
||
|
|
db := MustOpenDB()
|
||
|
|
defer db.MustClose()
|
||
|
|
|
||
|
|
if err := db.Update(func(tx *bolt.Tx) error {
|
||
|
|
b, err := tx.CreateBucket([]byte("widgets"))
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
if err := b.Put([]byte("bar"), []byte{}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
if err := b.Put([]byte("foo"), []byte{}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
tx, err := db.Begin(false)
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
c := tx.Bucket([]byte("widgets")).Cursor()
|
||
|
|
|
||
|
|
if k, _ := c.First(); !bytes.Equal(k, []byte("bar")) {
|
||
|
|
t.Fatalf("unexpected key: %v", k)
|
||
|
|
}
|
||
|
|
if k, _ := c.Next(); !bytes.Equal(k, []byte("foo")) {
|
||
|
|
t.Fatalf("unexpected key: %v", k)
|
||
|
|
}
|
||
|
|
|
||
|
|
if k, _ := c.First(); !bytes.Equal(k, []byte("bar")) {
|
||
|
|
t.Fatalf("unexpected key: %v", k)
|
||
|
|
}
|
||
|
|
if k, _ := c.Next(); !bytes.Equal(k, []byte("foo")) {
|
||
|
|
t.Fatalf("unexpected key: %v", k)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := tx.Rollback(); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ensure that a cursor can skip over empty pages that have been deleted.
|
||
|
|
func TestCursor_First_EmptyPages(t *testing.T) {
|
||
|
|
db := MustOpenDB()
|
||
|
|
defer db.MustClose()
|
||
|
|
|
||
|
|
// Create 1000 keys in the "widgets" bucket.
|
||
|
|
if err := db.Update(func(tx *bolt.Tx) error {
|
||
|
|
b, err := tx.CreateBucket([]byte("widgets"))
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
for i := 0; i < 1000; i++ {
|
||
|
|
if err := b.Put(u64tob(uint64(i)), []byte{}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Delete half the keys and then try to iterate.
|
||
|
|
if err := db.Update(func(tx *bolt.Tx) error {
|
||
|
|
b := tx.Bucket([]byte("widgets"))
|
||
|
|
for i := 0; i < 600; i++ {
|
||
|
|
if err := b.Delete(u64tob(uint64(i))); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
c := b.Cursor()
|
||
|
|
var n int
|
||
|
|
for k, _ := c.First(); k != nil; k, _ = c.Next() {
|
||
|
|
n++
|
||
|
|
}
|
||
|
|
if n != 400 {
|
||
|
|
t.Fatalf("unexpected key count: %d", n)
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ensure that a Tx can iterate over all elements in a bucket.
|
||
|
|
func TestCursor_QuickCheck(t *testing.T) {
|
||
|
|
f := func(items testdata) bool {
|
||
|
|
db := MustOpenDB()
|
||
|
|
defer db.MustClose()
|
||
|
|
|
||
|
|
// Bulk insert all values.
|
||
|
|
tx, err := db.Begin(true)
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
b, err := tx.CreateBucket([]byte("widgets"))
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
for _, item := range items {
|
||
|
|
if err := b.Put(item.Key, item.Value); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if err := tx.Commit(); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Sort test data.
|
||
|
|
sort.Sort(items)
|
||
|
|
|
||
|
|
// Iterate over all items and check consistency.
|
||
|
|
var index = 0
|
||
|
|
tx, err = db.Begin(false)
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
c := tx.Bucket([]byte("widgets")).Cursor()
|
||
|
|
for k, v := c.First(); k != nil && index < len(items); k, v = c.Next() {
|
||
|
|
if !bytes.Equal(k, items[index].Key) {
|
||
|
|
t.Fatalf("unexpected key: %v", k)
|
||
|
|
} else if !bytes.Equal(v, items[index].Value) {
|
||
|
|
t.Fatalf("unexpected value: %v", v)
|
||
|
|
}
|
||
|
|
index++
|
||
|
|
}
|
||
|
|
if len(items) != index {
|
||
|
|
t.Fatalf("unexpected item count: %v, expected %v", len(items), index)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := tx.Rollback(); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
if err := quick.Check(f, qconfig()); err != nil {
|
||
|
|
t.Error(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ensure that a transaction can iterate over all elements in a bucket in reverse.
|
||
|
|
func TestCursor_QuickCheck_Reverse(t *testing.T) {
|
||
|
|
f := func(items testdata) bool {
|
||
|
|
db := MustOpenDB()
|
||
|
|
defer db.MustClose()
|
||
|
|
|
||
|
|
// Bulk insert all values.
|
||
|
|
tx, err := db.Begin(true)
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
b, err := tx.CreateBucket([]byte("widgets"))
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
for _, item := range items {
|
||
|
|
if err := b.Put(item.Key, item.Value); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if err := tx.Commit(); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Sort test data.
|
||
|
|
sort.Sort(revtestdata(items))
|
||
|
|
|
||
|
|
// Iterate over all items and check consistency.
|
||
|
|
var index = 0
|
||
|
|
tx, err = db.Begin(false)
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
c := tx.Bucket([]byte("widgets")).Cursor()
|
||
|
|
for k, v := c.Last(); k != nil && index < len(items); k, v = c.Prev() {
|
||
|
|
if !bytes.Equal(k, items[index].Key) {
|
||
|
|
t.Fatalf("unexpected key: %v", k)
|
||
|
|
} else if !bytes.Equal(v, items[index].Value) {
|
||
|
|
t.Fatalf("unexpected value: %v", v)
|
||
|
|
}
|
||
|
|
index++
|
||
|
|
}
|
||
|
|
if len(items) != index {
|
||
|
|
t.Fatalf("unexpected item count: %v, expected %v", len(items), index)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := tx.Rollback(); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
if err := quick.Check(f, qconfig()); err != nil {
|
||
|
|
t.Error(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ensure that a Tx cursor can iterate over subbuckets.
|
||
|
|
func TestCursor_QuickCheck_BucketsOnly(t *testing.T) {
|
||
|
|
db := MustOpenDB()
|
||
|
|
defer db.MustClose()
|
||
|
|
|
||
|
|
if err := db.Update(func(tx *bolt.Tx) error {
|
||
|
|
b, err := tx.CreateBucket([]byte("widgets"))
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
if _, err := b.CreateBucket([]byte("foo")); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
if _, err := b.CreateBucket([]byte("bar")); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
if _, err := b.CreateBucket([]byte("baz")); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := db.View(func(tx *bolt.Tx) error {
|
||
|
|
var names []string
|
||
|
|
c := tx.Bucket([]byte("widgets")).Cursor()
|
||
|
|
for k, v := c.First(); k != nil; k, v = c.Next() {
|
||
|
|
names = append(names, string(k))
|
||
|
|
if v != nil {
|
||
|
|
t.Fatalf("unexpected value: %v", v)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if !reflect.DeepEqual(names, []string{"bar", "baz", "foo"}) {
|
||
|
|
t.Fatalf("unexpected names: %+v", names)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Ensure that a Tx cursor can reverse iterate over subbuckets.
|
||
|
|
func TestCursor_QuickCheck_BucketsOnly_Reverse(t *testing.T) {
|
||
|
|
db := MustOpenDB()
|
||
|
|
defer db.MustClose()
|
||
|
|
|
||
|
|
if err := db.Update(func(tx *bolt.Tx) error {
|
||
|
|
b, err := tx.CreateBucket([]byte("widgets"))
|
||
|
|
if err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
if _, err := b.CreateBucket([]byte("foo")); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
if _, err := b.CreateBucket([]byte("bar")); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
if _, err := b.CreateBucket([]byte("baz")); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := db.View(func(tx *bolt.Tx) error {
|
||
|
|
var names []string
|
||
|
|
c := tx.Bucket([]byte("widgets")).Cursor()
|
||
|
|
for k, v := c.Last(); k != nil; k, v = c.Prev() {
|
||
|
|
names = append(names, string(k))
|
||
|
|
if v != nil {
|
||
|
|
t.Fatalf("unexpected value: %v", v)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if !reflect.DeepEqual(names, []string{"foo", "baz", "bar"}) {
|
||
|
|
t.Fatalf("unexpected names: %+v", names)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
t.Fatal(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleCursor() {
|
||
|
|
// Open the database.
|
||
|
|
db, err := bolt.Open(tempfile(), 0666, nil)
|
||
|
|
if err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
defer os.Remove(db.Path())
|
||
|
|
|
||
|
|
// Start a read-write transaction.
|
||
|
|
if err := db.Update(func(tx *bolt.Tx) error {
|
||
|
|
// Create a new bucket.
|
||
|
|
b, err := tx.CreateBucket([]byte("animals"))
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// Insert data into a bucket.
|
||
|
|
if err := b.Put([]byte("dog"), []byte("fun")); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
if err := b.Put([]byte("cat"), []byte("lame")); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
if err := b.Put([]byte("liger"), []byte("awesome")); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Create a cursor for iteration.
|
||
|
|
c := b.Cursor()
|
||
|
|
|
||
|
|
// Iterate over items in sorted key order. This starts from the
|
||
|
|
// first key/value pair and updates the k/v variables to the
|
||
|
|
// next key/value on each iteration.
|
||
|
|
//
|
||
|
|
// The loop finishes at the end of the cursor when a nil key is returned.
|
||
|
|
for k, v := c.First(); k != nil; k, v = c.Next() {
|
||
|
|
fmt.Printf("A %s is %s.\n", k, v)
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
if err := db.Close(); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Output:
|
||
|
|
// A cat is lame.
|
||
|
|
// A dog is fun.
|
||
|
|
// A liger is awesome.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleCursor_reverse() {
|
||
|
|
// Open the database.
|
||
|
|
db, err := bolt.Open(tempfile(), 0666, nil)
|
||
|
|
if err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
defer os.Remove(db.Path())
|
||
|
|
|
||
|
|
// Start a read-write transaction.
|
||
|
|
if err := db.Update(func(tx *bolt.Tx) error {
|
||
|
|
// Create a new bucket.
|
||
|
|
b, err := tx.CreateBucket([]byte("animals"))
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// Insert data into a bucket.
|
||
|
|
if err := b.Put([]byte("dog"), []byte("fun")); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
if err := b.Put([]byte("cat"), []byte("lame")); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
if err := b.Put([]byte("liger"), []byte("awesome")); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Create a cursor for iteration.
|
||
|
|
c := b.Cursor()
|
||
|
|
|
||
|
|
// Iterate over items in reverse sorted key order. This starts
|
||
|
|
// from the last key/value pair and updates the k/v variables to
|
||
|
|
// the previous key/value on each iteration.
|
||
|
|
//
|
||
|
|
// The loop finishes at the beginning of the cursor when a nil key
|
||
|
|
// is returned.
|
||
|
|
for k, v := c.Last(); k != nil; k, v = c.Prev() {
|
||
|
|
fmt.Printf("A %s is %s.\n", k, v)
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Close the database to release the file lock.
|
||
|
|
if err := db.Close(); err != nil {
|
||
|
|
log.Fatal(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Output:
|
||
|
|
// A liger is awesome.
|
||
|
|
// A dog is fun.
|
||
|
|
// A cat is lame.
|
||
|
|
}
|