本文整理汇总了Golang中github.com/cockroachdb/cockroach/storage/engine.Scan函数的典型用法代码示例。如果您正苦于以下问题：Golang Scan函数的具体用法？Golang Scan怎么用？Golang Scan使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。
在下文中一共展示了Scan函数的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: TestGCQueueProcess
//.........这里部分代码省略.........
if datum.del {
dArgs := deleteArgs(datum.key)
var txn *roachpb.Transaction
if datum.txn {
txn = newTransaction("test", datum.key, 1, enginepb.SERIALIZABLE, tc.clock)
txn.OrigTimestamp = datum.ts
txn.Timestamp = datum.ts
}
if _, err := tc.SendWrappedWith(roachpb.Header{
Timestamp: datum.ts,
Txn: txn,
}, &dArgs); err != nil {
t.Fatalf("%d: could not delete data: %s", i, err)
}
} else {
pArgs := putArgs(datum.key, []byte("value"))
var txn *roachpb.Transaction
if datum.txn {
txn = newTransaction("test", datum.key, 1, enginepb.SERIALIZABLE, tc.clock)
txn.OrigTimestamp = datum.ts
txn.Timestamp = datum.ts
}
if _, err := tc.SendWrappedWith(roachpb.Header{
Timestamp: datum.ts,
Txn: txn,
}, &pArgs); err != nil {
t.Fatalf("%d: could not put data: %s", i, err)
}
}
}
cfg, ok := tc.gossip.GetSystemConfig()
if !ok {
t.Fatal("config not set")
}
// Process through a scan queue.
gcQ := newGCQueue(tc.gossip)
if err := gcQ.process(tc.clock.Now(), tc.rng, cfg); err != nil {
t.Fatal(err)
}
expKVs := []struct {
key roachpb.Key
ts hlc.Timestamp
}{
{key1, ts5},
{key1, ts2},
{key2, ts5},
{key2, ts2m1},
{key3, hlc.ZeroTimestamp},
{key3, ts5},
{key3, ts2},
{key4, ts2},
{key6, hlc.ZeroTimestamp},
{key6, ts5},
{key6, ts1},
{key7, hlc.ZeroTimestamp},
{key7, ts4},
{key7, ts2},
{key8, ts2},
{key10, ts5},
{key10, ts4},
{key10, ts3},
{key11, ts5},
{key11, ts4},
{key11, ts3},
{key11, ts1},
}
// Read data directly from engine to avoid intent errors from MVCC.
kvs, err := engine.Scan(tc.store.Engine(), engine.MakeMVCCMetadataKey(key1),
engine.MakeMVCCMetadataKey(keys.MaxKey), 0)
if err != nil {
t.Fatal(err)
}
for i, kv := range kvs {
if log.V(1) {
log.Infof("%d: %s", i, kv.Key)
}
}
if len(kvs) != len(expKVs) {
t.Fatalf("expected length %d; got %d", len(expKVs), len(kvs))
}
for i, kv := range kvs {
if !kv.Key.Key.Equal(expKVs[i].key) {
t.Errorf("%d: expected key %q; got %q", i, expKVs[i].key, kv.Key.Key)
}
if !kv.Key.Timestamp.Equal(expKVs[i].ts) {
t.Errorf("%d: expected ts=%s; got %s", i, expKVs[i].ts, kv.Key.Timestamp)
}
if log.V(1) {
log.Infof("%d: %s", i, kv.Key)
}
}
// Verify that the last verification timestamp was updated as whole range was scanned.
if _, err := tc.rng.getLastVerificationTimestamp(); err != nil {
t.Fatal(err)
}
}示例2: TestGCQueueProcess
//.........这里部分代码省略.........
t.Fatalf("%d: could not delete data: %s", i, err)
}
} else {
pArgs, pReply := putArgs(datum.key, []byte("value"), tc.rng.Desc().RaftID, tc.store.StoreID())
pArgs.Timestamp = datum.ts
if datum.txn {
pArgs.Txn = newTransaction("test", datum.key, 1, proto.SERIALIZABLE, tc.clock)
pArgs.Txn.Timestamp = datum.ts
}
if err := tc.rng.AddCmd(tc.rng.context(), proto.Call{Args: pArgs, Reply: pReply}); err != nil {
t.Fatalf("%d: could not put data: %s", i, err)
}
}
}
// Process through a scan queue.
gcQ := newGCQueue()
if err := gcQ.process(tc.clock.Now(), tc.rng); err != nil {
t.Error(err)
}
expKVs := []struct {
key proto.Key
ts proto.Timestamp
}{
{key1, proto.ZeroTimestamp},
{key1, ts5},
{key3, proto.ZeroTimestamp},
{key3, ts5},
{key3, ts2},
{key4, proto.ZeroTimestamp},
{key4, ts2},
{key6, proto.ZeroTimestamp},
{key6, ts5},
{key6, ts1},
{key7, proto.ZeroTimestamp},
{key7, ts4},
{key7, ts2},
{key8, proto.ZeroTimestamp},
{key8, ts2},
}
// Read data directly from engine to avoid intent errors from MVCC.
kvs, err := engine.Scan(tc.store.Engine(), engine.MVCCEncodeKey(key1), engine.MVCCEncodeKey(proto.KeyMax), 0)
if err != nil {
t.Fatal(err)
}
for i, kv := range kvs {
if key, ts, isValue := engine.MVCCDecodeKey(kv.Key); isValue {
if log.V(1) {
log.Infof("%d: %q, ts=%s", i, key, ts)
}
} else {
if log.V(1) {
log.Infof("%d: %q meta", i, key)
}
}
}
if len(kvs) != len(expKVs) {
t.Fatalf("expected length %d; got %d", len(expKVs), len(kvs))
}
for i, kv := range kvs {
key, ts, isValue := engine.MVCCDecodeKey(kv.Key)
if !key.Equal(expKVs[i].key) {
t.Errorf("%d: expected key %q; got %q", i, expKVs[i].key, key)
}
if !ts.Equal(expKVs[i].ts) {
t.Errorf("%d: expected ts=%s; got %s", i, expKVs[i].ts, ts)
}
if isValue {
if log.V(1) {
log.Infof("%d: %q, ts=%s", i, key, ts)
}
} else {
if log.V(1) {
log.Infof("%d: %q meta", i, key)
}
}
}
// Verify the oldest extant intent age.
gcMeta, err := tc.rng.GetGCMetadata()
if err != nil {
t.Fatal(err)
}
if gcMeta.LastScanNanos != now {
t.Errorf("expected last scan nanos=%d; got %d", now, gcMeta.LastScanNanos)
}
if *gcMeta.OldestIntentNanos != ts4.WallTime {
t.Errorf("expected oldest intent nanos=%d; got %d", ts4.WallTime, gcMeta.OldestIntentNanos)
}
// Verify that the last verification timestamp was updated as whole range was scanned.
ts, err := tc.rng.GetLastVerificationTimestamp()
if err != nil {
t.Fatal(err)
}
if gcMeta.LastScanNanos != ts.WallTime {
t.Errorf("expected walltime nanos %d; got %d", gcMeta.LastScanNanos, ts.WallTime)
}
}