Golang tablecodec.DecodeRowKey函数代码示例

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本文整理汇总了Golang中github.com/pingcap/tidb/tablecodec.DecodeRowKey函数的典型用法代码示例。如果您正苦于以下问题：Golang DecodeRowKey函数的具体用法？Golang DecodeRowKey怎么用？Golang DecodeRowKey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DecodeRowKey函数的9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，您的评价将有助于我们的系统推荐出更棒的Golang代码示例。

示例1: GetTableRecordsCount

// GetTableRecordsCount returns the total number of table records from startHandle.
// If startHandle = 0, returns the total number of table records.
func GetTableRecordsCount(txn kv.Transaction, t table.Table, startHandle int64) (int64, error) {
	startKey := t.RecordKey(startHandle, nil)
	it, err := txn.Seek(startKey)
	if err != nil {
		return 0, errors.Trace(err)
	}

	var cnt int64
	prefix := t.RecordPrefix()
	for it.Valid() && it.Key().HasPrefix(prefix) {
		handle, err := tablecodec.DecodeRowKey(it.Key())
		if err != nil {
			return 0, errors.Trace(err)
		}

		it.Close()
		rk := t.RecordKey(handle+1, nil)
		it, err = txn.Seek(rk)
		if err != nil {
			return 0, errors.Trace(err)
		}

		cnt++
	}

	it.Close()

	return cnt, nil
}

开发者ID:yangxingnn，项目名称:tidb，代码行数:31，代码来源:inspectkv.go

示例2: IterRecords

// IterRecords implements table.Table IterRecords interface.
func (t *Table) IterRecords(ctx context.Context, startKey kv.Key, cols []*table.Column,
	fn table.RecordIterFunc) error {
	txn, err := ctx.GetTxn(false)
	if err != nil {
		return errors.Trace(err)
	}
	it, err := txn.Seek(startKey)
	if err != nil {
		return errors.Trace(err)
	}
	defer it.Close()

	if !it.Valid() {
		return nil
	}

	log.Debugf("startKey:%q, key:%q, value:%q", startKey, it.Key(), it.Value())

	colMap := make(map[int64]*types.FieldType)
	for _, col := range cols {
		colMap[col.ID] = &col.FieldType
	}
	prefix := t.RecordPrefix()
	for it.Valid() && it.Key().HasPrefix(prefix) {
		// first kv pair is row lock information.
		// TODO: check valid lock
		// get row handle
		handle, err := tablecodec.DecodeRowKey(it.Key())
		if err != nil {
			return errors.Trace(err)
		}
		rowMap, err := tablecodec.DecodeRow(it.Value(), colMap)
		if err != nil {
			return errors.Trace(err)
		}
		data := make([]types.Datum, 0, len(cols))
		for _, col := range cols {
			if col.IsPKHandleColumn(t.Meta()) {
				data = append(data, types.NewIntDatum(handle))
			} else {
				data = append(data, rowMap[col.ID])
			}
		}
		more, err := fn(handle, data, cols)
		if !more || err != nil {
			return errors.Trace(err)
		}

		rk := t.RecordKey(handle)
		err = kv.NextUntil(it, util.RowKeyPrefixFilter(rk))
		if err != nil {
			return errors.Trace(err)
		}
	}

	return nil
}

开发者ID:pingcap，项目名称:tidb，代码行数:58，代码来源:tables.go

示例3: TestRowKeyCodec

func (ts *testSuite) TestRowKeyCodec(c *C) {
	table := []struct {
		tableID int64
		h       int64
		ID      int64
	}{
		{1, 1234567890, 0},
		{2, 1, 0},
		{3, -1, 0},
		{4, -1, 1},
	}

	for _, t := range table {
		b := tablecodec.EncodeColumnKey(t.tableID, t.h, t.ID)
		tableID, handle, columnID, err := tablecodec.DecodeRecordKey(b)
		c.Assert(err, IsNil)
		c.Assert(tableID, Equals, t.tableID)
		c.Assert(handle, Equals, t.h)
		c.Assert(columnID, Equals, t.ID)

		handle, err = tablecodec.DecodeRowKey(b)
		c.Assert(err, IsNil)
		c.Assert(handle, Equals, t.h)
	}

	// test error
	tbl := []string{
		"",
		"x",
		"t1",
		"t12345678",
		"t12345678_i",
		"t12345678_r1",
		"t12345678_r1234567",
		"t12345678_r123456781",
	}

	for _, t := range tbl {
		_, err := tablecodec.DecodeRowKey(kv.Key(t))
		c.Assert(err, NotNil)
	}
}

开发者ID:yangxingnn，项目名称:tidb，代码行数:42，代码来源:tables_test.go

示例4: getSnapshotRows

func (d *ddl) getSnapshotRows(t table.Table, version uint64, seekHandle int64) ([]int64, error) {
	ver := kv.Version{Ver: version}

	snap, err := d.store.GetSnapshot(ver)
	if err != nil {
		return nil, errors.Trace(err)
	}

	defer snap.Release()

	firstKey := t.RecordKey(seekHandle)

	it, err := snap.Seek(firstKey)
	if err != nil {
		return nil, errors.Trace(err)
	}
	defer it.Close()

	handles := make([]int64, 0, maxBatchSize)

	for it.Valid() {
		if !it.Key().HasPrefix(t.RecordPrefix()) {
			break
		}

		var handle int64
		handle, err = tablecodec.DecodeRowKey(it.Key())
		if err != nil {
			return nil, errors.Trace(err)
		}

		rk := t.RecordKey(handle)

		handles = append(handles, handle)
		if len(handles) == maxBatchSize {
			break
		}

		err = kv.NextUntil(it, util.RowKeyPrefixFilter(rk))
		if terror.ErrorEqual(err, kv.ErrNotExist) {
			break
		} else if err != nil {
			return nil, errors.Trace(err)
		}
	}

	return handles, nil
}

开发者ID:duzhanyuan，项目名称:tidb，代码行数:48，代码来源:index.go

示例5: Seek

// Seek implements table.Table Seek interface.
func (t *Table) Seek(ctx context.Context, h int64) (int64, bool, error) {
	seekKey := tablecodec.EncodeRowKeyWithHandle(t.ID, h)
	txn, err := ctx.GetTxn(false)
	if err != nil {
		return 0, false, errors.Trace(err)
	}
	iter, err := txn.Seek(seekKey)
	if !iter.Valid() || !iter.Key().HasPrefix(t.RecordPrefix()) {
		// No more records in the table, skip to the end.
		return 0, false, nil
	}
	handle, err := tablecodec.DecodeRowKey(iter.Key())
	if err != nil {
		return 0, false, errors.Trace(err)
	}
	return handle, true, nil
}

开发者ID:pingcap，项目名称:tidb，代码行数:18，代码来源:tables.go

示例6: iterRecords

func iterRecords(retriever kv.Retriever, t table.Table, startKey kv.Key, cols []*table.Column,
	fn table.RecordIterFunc) error {
	it, err := retriever.Seek(startKey)
	if err != nil {
		return errors.Trace(err)
	}
	defer it.Close()

	if !it.Valid() {
		return nil
	}

	log.Debugf("startKey:%q, key:%q, value:%q", startKey, it.Key(), it.Value())

	prefix := t.RecordPrefix()
	for it.Valid() && it.Key().HasPrefix(prefix) {
		// first kv pair is row lock information.
		// TODO: check valid lock
		// get row handle
		handle, err := tablecodec.DecodeRowKey(it.Key())
		if err != nil {
			return errors.Trace(err)
		}

		data, err := rowWithCols(retriever, t, handle, cols)
		if err != nil {
			return errors.Trace(err)
		}
		more, err := fn(handle, data, cols)
		if !more || err != nil {
			return errors.Trace(err)
		}

		rk := t.RecordKey(handle, nil)
		err = kv.NextUntil(it, util.RowKeyPrefixFilter(rk))
		if err != nil {
			return errors.Trace(err)
		}
	}

	return nil
}

开发者ID:yangxingnn，项目名称:tidb，代码行数:42，代码来源:inspectkv.go

示例7: getRowsFromRange

func (rs *localRegion) getRowsFromRange(ctx *selectContext, ran kv.KeyRange, limit int64, desc bool) (count int64, err error) {
	if limit == 0 {
		return 0, nil
	}
	if ran.IsPoint() {
		var value []byte
		value, err = ctx.txn.Get(ran.StartKey)
		if terror.ErrorEqual(err, kv.ErrNotExist) {
			return 0, nil
		} else if err != nil {
			return 0, errors.Trace(err)
		}
		var h int64
		h, err = tablecodec.DecodeRowKey(ran.StartKey)
		if err != nil {
			return 0, errors.Trace(err)
		}
		gotRow, err1 := rs.handleRowData(ctx, h, value)
		if err1 != nil {
			return 0, errors.Trace(err1)
		}

		if gotRow {
			count++
		}
		return
	}
	var seekKey kv.Key
	if desc {
		seekKey = ran.EndKey
	} else {
		seekKey = ran.StartKey
	}
	for {
		if limit == 0 {
			break
		}
		var (
			it  kv.Iterator
			err error
		)
		if desc {
			it, err = ctx.txn.SeekReverse(seekKey)
		} else {
			it, err = ctx.txn.Seek(seekKey)
		}
		if err != nil {
			return 0, errors.Trace(err)
		}
		if !it.Valid() {
			break
		}
		if desc {
			if it.Key().Cmp(ran.StartKey) < 0 {
				break
			}
			seekKey = tablecodec.TruncateToRowKeyLen(it.Key())
		} else {
			if it.Key().Cmp(ran.EndKey) >= 0 {
				break
			}
			seekKey = it.Key().PrefixNext()
		}
		h, err := tablecodec.DecodeRowKey(it.Key())
		if err != nil {
			return 0, errors.Trace(err)
		}
		gotRow, err := rs.handleRowData(ctx, h, it.Value())
		if err != nil {
			return 0, errors.Trace(err)
		}
		if gotRow {
			limit--
			count++
		}
	}
	return count, nil
}

开发者ID:jmptrader，项目名称:tidb，代码行数:78，代码来源:local_region.go

示例8: getRowsFromRange

func (h *rpcHandler) getRowsFromRange(ctx *selectContext, ran kv.KeyRange, limit int64, desc bool) ([]*tipb.Row, error) {
	startKey := maxStartKey(ran.StartKey, h.startKey)
	endKey := minEndKey(ran.EndKey, h.endKey)
	if limit == 0 || bytes.Compare(startKey, endKey) >= 0 {
		return nil, nil
	}
	var rows []*tipb.Row
	if ran.IsPoint() {
		val, err := h.mvccStore.Get(startKey, ctx.sel.GetStartTs())
		if len(val) == 0 {
			return nil, nil
		} else if err != nil {
			return nil, errors.Trace(err)
		}
		handle, err := tablecodec.DecodeRowKey(kv.Key(startKey))
		if err != nil {
			return nil, errors.Trace(err)
		}
		row, err := h.handleRowData(ctx, handle, val)
		if err != nil {
			return nil, errors.Trace(err)
		}
		if row != nil {
			rows = append(rows, row)
		}
		return rows, nil
	}
	var seekKey []byte
	if desc {
		seekKey = endKey
	} else {
		seekKey = startKey
	}
	for {
		if limit == 0 {
			break
		}
		var (
			pairs []Pair
			pair  Pair
			err   error
		)
		if desc {
			pairs = h.mvccStore.ReverseScan(startKey, seekKey, 1, ctx.sel.GetStartTs())
		} else {
			pairs = h.mvccStore.Scan(seekKey, endKey, 1, ctx.sel.GetStartTs())
		}
		if len(pairs) > 0 {
			pair = pairs[0]
		}
		if pair.Err != nil {
			// TODO: handle lock error.
			return nil, errors.Trace(pair.Err)
		}
		if pair.Key == nil {
			break
		}
		if desc {
			if bytes.Compare(pair.Key, startKey) < 0 {
				break
			}
			seekKey = []byte(tablecodec.TruncateToRowKeyLen(kv.Key(pair.Key)))
		} else {
			if bytes.Compare(pair.Key, endKey) >= 0 {
				break
			}
			seekKey = []byte(kv.Key(pair.Key).PrefixNext())
		}
		handle, err := tablecodec.DecodeRowKey(pair.Key)
		if err != nil {
			return nil, errors.Trace(err)
		}
		row, err := h.handleRowData(ctx, handle, pair.Value)
		if err != nil {
			return nil, errors.Trace(err)
		}
		if row != nil {
			rows = append(rows, row)
			limit--
		}
	}
	return rows, nil
}

开发者ID:yangxuanjia，项目名称:tidb，代码行数:83，代码来源:cop_handler.go

示例9: getRowsFromRange

func (rs *localRegion) getRowsFromRange(ctx *selectContext, ran kv.KeyRange, limit int64, desc bool) ([]*tipb.Row, error) {
	if limit == 0 {
		return nil, nil
	}
	var rows []*tipb.Row
	if ran.IsPoint() {
		value, err := ctx.txn.Get(ran.StartKey)
		if terror.ErrorEqual(err, kv.ErrNotExist) {
			return nil, nil
		} else if err != nil {
			return nil, errors.Trace(err)
		}
		h, err := tablecodec.DecodeRowKey(ran.StartKey)
		if err != nil {
			return nil, errors.Trace(err)
		}
		row, err := rs.handleRowData(ctx, h, value)
		if err != nil {
			return nil, errors.Trace(err)
		}

		if row != nil {
			rows = append(rows, row)
		}
		return rows, nil
	}
	var seekKey kv.Key
	if desc {
		seekKey = ran.EndKey
	} else {
		seekKey = ran.StartKey
	}
	for {
		if limit == 0 {
			break
		}
		var (
			it  kv.Iterator
			err error
		)
		if desc {
			it, err = ctx.txn.SeekReverse(seekKey)
		} else {
			it, err = ctx.txn.Seek(seekKey)
		}
		if err != nil {
			return nil, errors.Trace(err)
		}
		if !it.Valid() {
			break
		}
		if desc {
			if it.Key().Cmp(ran.StartKey) < 0 {
				break
			}
			seekKey = tablecodec.TruncateToRowKeyLen(it.Key())
		} else {
			if it.Key().Cmp(ran.EndKey) >= 0 {
				break
			}
			seekKey = it.Key().PrefixNext()
		}
		h, err := tablecodec.DecodeRowKey(it.Key())
		if err != nil {
			return nil, errors.Trace(err)
		}
		row, err := rs.handleRowData(ctx, h, it.Value())
		if err != nil {
			return nil, errors.Trace(err)
		}
		if row != nil {
			rows = append(rows, row)
			limit--
		}
	}
	return rows, nil
}

开发者ID:XuHuaiyu，项目名称:tidb，代码行数:77，代码来源:local_region.go

注：本文中的github.com/pingcap/tidb/tablecodec.DecodeRowKey函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。