本文整理汇总了Golang中github.com/pingcap/tidb/kv.Retriever类的典型用法代码示例。如果您正苦于以下问题：Golang Retriever类的具体用法？Golang Retriever怎么用？Golang Retriever使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了Retriever类的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，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: rowWithCols
func rowWithCols(txn kv.Retriever, t table.Table, h int64, cols []*table.Column) ([]types.Datum, error) {
v := make([]types.Datum, len(cols))
for i, col := range cols {
if col.State != model.StatePublic {
return nil, errInvalidColumnState.Gen("Cannot use none public column - %v", cols)
}
if col.IsPKHandleColumn(t.Meta()) {
v[i].SetInt64(h)
continue
}
k := t.RecordKey(h, col)
data, err := txn.Get(k)
if terror.ErrorEqual(err, kv.ErrNotExist) && !mysql.HasNotNullFlag(col.Flag) {
continue
} else if err != nil {
return nil, errors.Trace(err)
}
val, err := tables.DecodeValue(data, &col.FieldType)
if err != nil {
return nil, errors.Trace(err)
}
v[i] = val
}
return v, nil
}示例2: RowWithCols
// RowWithCols implements table.Table RowWithCols interface.
func (t *Table) RowWithCols(retriever kv.Retriever, h int64, cols []*column.Col) ([]interface{}, error) {
v := make([]interface{}, len(cols))
for _, col := range cols {
if col.State != model.StatePublic {
return nil, errors.Errorf("Cannot use none public column - %v", cols)
}
if col.IsPKHandleColumn(t.meta) {
v[col.Offset] = h
continue
}
k := t.RecordKey(h, col)
data, err := retriever.Get(k)
if err != nil {
return nil, errors.Trace(err)
}
val, err := t.DecodeValue(data, col)
if err != nil {
return nil, errors.Trace(err)
}
v[col.Offset] = val
}
return v, nil
}示例3: SeekFirst
// SeekFirst returns an iterator which points to the first entry of the KV index.
func (c *index) SeekFirst(r kv.Retriever) (iter table.IndexIterator, err error) {
it, err := r.Seek(c.prefix)
if err != nil {
return nil, errors.Trace(err)
}
return &indexIter{it: it, idx: c, prefix: c.prefix}, nil
}示例4: ScanMetaWithPrefix
// ScanMetaWithPrefix scans metadata with the prefix.
func ScanMetaWithPrefix(retriever kv.Retriever, prefix kv.Key, filter func(kv.Key, []byte) bool) error {
iter, err := retriever.Seek(prefix)
if err != nil {
return errors.Trace(err)
}
defer iter.Close()
for {
if err != nil {
return errors.Trace(err)
}
if iter.Valid() && iter.Key().HasPrefix(prefix) {
if !filter(iter.Key(), iter.Value()) {
break
}
err = iter.Next()
if err != nil {
return errors.Trace(err)
}
} else {
break
}
}
return nil
}示例5: rowWithCols
func rowWithCols(txn kv.Retriever, t table.Table, h int64, cols []*column.Col) ([]types.Datum, error) {
v := make([]types.Datum, len(cols))
for i, col := range cols {
if col.State != model.StatePublic {
return nil, errors.Errorf("Cannot use none public column - %v", cols)
}
if col.IsPKHandleColumn(t.Meta()) {
v[i].SetInt64(h)
continue
}
k := t.RecordKey(h, col)
data, err := txn.Get(k)
if err != nil {
return nil, errors.Trace(err)
}
val, err := tables.DecodeValue(data, &col.FieldType)
if err != nil {
return nil, errors.Trace(err)
}
v[i] = val
}
return v, nil
}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())
colMap := make(map[int64]*types.FieldType, len(cols))
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
}示例7: rowWithCols
func rowWithCols(txn kv.Retriever, t table.Table, h int64, cols []*table.Column) ([]types.Datum, error) {
key := t.RecordKey(h)
value, err := txn.Get(key)
if err != nil {
return nil, errors.Trace(err)
}
v := make([]types.Datum, len(cols))
colTps := make(map[int64]*types.FieldType, len(cols))
for i, col := range cols {
if col == nil {
continue
}
if col.State != model.StatePublic {
return nil, errInvalidColumnState.Gen("Cannot use none public column - %v", cols)
}
if col.IsPKHandleColumn(t.Meta()) {
if mysql.HasUnsignedFlag(col.Flag) {
v[i].SetUint64(uint64(h))
} else {
v[i].SetInt64(h)
}
continue
}
colTps[col.ID] = &col.FieldType
}
row, err := tablecodec.DecodeRow(value, colTps)
if err != nil {
return nil, errors.Trace(err)
}
for i, col := range cols {
if col == nil {
continue
}
if col.State != model.StatePublic {
// TODO: check this
return nil, errInvalidColumnState.Gen("Cannot use none public column - %v", cols)
}
if col.IsPKHandleColumn(t.Meta()) {
continue
}
ri, ok := row[col.ID]
if !ok && mysql.HasNotNullFlag(col.Flag) {
return nil, errors.New("Miss")
}
v[i] = ri
}
return v, nil
}示例8: Seek
// Seek searches KV index for the entry with indexedValues.
func (c *index) Seek(r kv.Retriever, indexedValues []types.Datum) (iter table.IndexIterator, hit bool, err error) {
key, _, err := c.GenIndexKey(indexedValues, 0)
if err != nil {
return nil, false, errors.Trace(err)
}
it, err := r.Seek(key)
if err != nil {
return nil, false, errors.Trace(err)
}
// check if hit
hit = false
if it.Valid() && it.Key().Cmp(key) == 0 {
hit = true
}
return &indexIter{it: it, idx: c, prefix: c.prefix}, hit, nil
}示例9: 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 := tables.DecodeRecordKeyHandle(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
}