Golang Batch.CPut方法代码示例

// RenameDatabase renames the database.
// Privileges: security.RootUser user.
//   Notes: postgres requires superuser, db owner, or "CREATEDB".
//          mysql >= 5.1.23 does not allow database renames.
func (p *planner) RenameDatabase(n *parser.RenameDatabase) (planNode, error) {
	if n.Name == "" || n.NewName == "" {
		return nil, errEmptyDatabaseName
	}

	if p.session.User != security.RootUser {
		return nil, fmt.Errorf("only %s is allowed to rename databases", security.RootUser)
	}

	dbDesc, err := p.getDatabaseDesc(string(n.Name))
	if err != nil {
		return nil, err
	}
	if dbDesc == nil {
		return nil, sqlbase.NewUndefinedDatabaseError(string(n.Name))
	}

	if n.Name == n.NewName {
		// Noop.
		return &emptyNode{}, nil
	}

	// Now update the nameMetadataKey and the descriptor.
	descKey := sqlbase.MakeDescMetadataKey(dbDesc.GetID())
	dbDesc.SetName(string(n.NewName))

	if err := dbDesc.Validate(); err != nil {
		return nil, err
	}

	newKey := databaseKey{string(n.NewName)}.Key()
	oldKey := databaseKey{string(n.Name)}.Key()
	descID := dbDesc.GetID()
	descDesc := sqlbase.WrapDescriptor(dbDesc)

	b := client.Batch{}
	b.CPut(newKey, descID, nil)
	b.Put(descKey, descDesc)
	b.Del(oldKey)

	if err := p.txn.Run(&b); err != nil {
		if _, ok := err.(*roachpb.ConditionFailedError); ok {
			return nil, fmt.Errorf("the new database name %q already exists", string(n.NewName))
		}
		return nil, err
	}

	p.setTestingVerifyMetadata(func(systemConfig config.SystemConfig) error {
		if err := expectDescriptorID(systemConfig, newKey, descID); err != nil {
			return err
		}
		if err := expectDescriptor(systemConfig, descKey, descDesc); err != nil {
			return err
		}
		return expectDeleted(systemConfig, oldKey)
	})

	return &emptyNode{}, nil
}

// insertCPutFn is used by insertRow when conflicts should be respected.
// logValue is used for pretty printing.
func insertCPutFn(b *client.Batch, key *roachpb.Key, value *roachpb.Value) {
	// TODO(dan): We want do this V(2) log everywhere in sql. Consider making a
	// client.Batch wrapper instead of inlining it everywhere.
	if log.V(2) {
		log.InfofDepth(1, "CPut %s -> %s", *key, value.PrettyPrint())
	}
	b.CPut(key, value, nil)
}

// createDescriptor implements the DescriptorAccessor interface.
func (p *planner) createDescriptor(plainKey sqlbase.DescriptorKey, descriptor sqlbase.DescriptorProto, ifNotExists bool) (bool, error) {
	idKey := plainKey.Key()
	// Check whether idKey exists.
	gr, err := p.txn.Get(idKey)
	if err != nil {
		return false, err
	}

	if gr.Exists() {
		if ifNotExists {
			// Noop.
			return false, nil
		}
		// Key exists, but we don't want it to: error out.
		return false, fmt.Errorf("%s %q already exists", descriptor.TypeName(), plainKey.Name())
	}

	// Increment unique descriptor counter.
	if ir, err := p.txn.Inc(keys.DescIDGenerator, 1); err == nil {
		descriptor.SetID(sqlbase.ID(ir.ValueInt() - 1))
	} else {
		return false, err
	}

	// TODO(pmattis): The error currently returned below is likely going to be
	// difficult to interpret.
	//
	// TODO(pmattis): Need to handle if-not-exists here as well.
	//
	// TODO(pmattis): This is writing the namespace and descriptor table entries,
	// but not going through the normal INSERT logic and not performing a precise
	// mimicry. In particular, we're only writing a single key per table, while
	// perfect mimicry would involve writing a sentinel key for each row as well.
	descKey := sqlbase.MakeDescMetadataKey(descriptor.GetID())

	b := client.Batch{}
	descID := descriptor.GetID()
	descDesc := sqlbase.WrapDescriptor(descriptor)
	if log.V(2) {
		log.Infof("CPut %s -> %d", idKey, descID)
		log.Infof("CPut %s -> %s", descKey, descDesc)
	}
	b.CPut(idKey, descID, nil)
	b.CPut(descKey, descDesc, nil)

	p.setTestingVerifyMetadata(func(systemConfig config.SystemConfig) error {
		if err := expectDescriptorID(systemConfig, idKey, descID); err != nil {
			return err
		}
		return expectDescriptor(systemConfig, descKey, descDesc)
	})

	return true, p.txn.Run(&b)
}

//.........这里部分代码省略.........
			// backwards compatible with the original BaseFormatVersion.

			idx, ok := ru.updateColIDtoRowIndex[family.DefaultColumnID]
			if !ok {
				continue
			}

			ru.key = keys.MakeFamilyKey(primaryIndexKey, uint32(family.ID))
			if log.V(2) {
				log.Infof("Put %s -> %v", ru.key, ru.marshalled[idx].PrettyPrint())
			}
			b.Put(&ru.key, &ru.marshalled[idx])
			ru.key = nil

			continue
		}

		ru.key = keys.MakeFamilyKey(primaryIndexKey, uint32(family.ID))
		ru.valueBuf = ru.valueBuf[:0]

		var lastColID sqlbase.ColumnID
		familySortedColumnIDs, ok := ru.helper.sortedColumnFamily(family.ID)
		if !ok {
			panic("invalid family sorted column id map")
		}
		for _, colID := range familySortedColumnIDs {
			if ru.helper.columnInPK(colID) {
				if family.ID != 0 {
					return nil, errors.Errorf("primary index column %d must be in family 0, was %d", colID, family.ID)
				}
				// Skip primary key columns as their values are encoded in the key of
				// each family. Family 0 is guaranteed to exist and acts as a sentinel.
				continue
			}

			idx, ok := ru.fetchColIDtoRowIndex[colID]
			if !ok {
				return nil, errors.Errorf("column %d was expected to be fetched, but wasn't", colID)
			}
			col := ru.fetchCols[idx]

			if ru.newValues[idx].Compare(parser.DNull) == 0 {
				continue
			}

			if lastColID > col.ID {
				panic(fmt.Errorf("cannot write column id %d after %d", col.ID, lastColID))
			}
			colIDDiff := col.ID - lastColID
			lastColID = col.ID
			ru.valueBuf, err = sqlbase.EncodeTableValue(ru.valueBuf, colIDDiff, ru.newValues[idx])
			if err != nil {
				return nil, err
			}
		}

		if family.ID != 0 && len(ru.valueBuf) == 0 {
			// The family might have already existed but every column in it is being
			// set to NULL, so delete it.
			if log.V(2) {
				log.Infof("Del %s", ru.key)
			}

			b.Del(&ru.key)
		} else {
			ru.value.SetTuple(ru.valueBuf)
			if log.V(2) {
				log.Infof("Put %s -> %v", ru.key, ru.value.PrettyPrint())
			}
			b.Put(&ru.key, &ru.value)
		}

		ru.key = nil
	}

	// Update secondary indexes.
	for i, newSecondaryIndexEntry := range newSecondaryIndexEntries {
		secondaryIndexEntry := secondaryIndexEntries[i]
		secondaryKeyChanged := !bytes.Equal(newSecondaryIndexEntry.Key, secondaryIndexEntry.Key)
		if secondaryKeyChanged {
			if err := ru.fks.checkIdx(ru.helper.indexes[i].ID, oldValues, ru.newValues); err != nil {
				return nil, err
			}

			if log.V(2) {
				log.Infof("Del %s", secondaryIndexEntry.Key)
			}
			b.Del(secondaryIndexEntry.Key)
			// Do not update Indexes in the DELETE_ONLY state.
			if _, ok := ru.deleteOnlyIndex[i]; !ok {
				if log.V(2) {
					log.Infof("CPut %s -> %v", newSecondaryIndexEntry.Key, newSecondaryIndexEntry.Value.PrettyPrint())
				}
				b.CPut(newSecondaryIndexEntry.Key, &newSecondaryIndexEntry.Value, nil)
			}
		}
	}

	return ru.newValues, nil
}

//.........这里部分代码省略.........
	if dbDesc == nil {
		return nil, sqlbase.NewUndefinedDatabaseError(n.Name.Database())
	}

	tbKey := tableKey{dbDesc.ID, n.Name.Table()}.Key()

	// Check if table exists.
	gr, err := p.txn.Get(tbKey)
	if err != nil {
		return nil, err
	}
	if !gr.Exists() {
		if n.IfExists {
			// Noop.
			return &emptyNode{}, nil
		}
		// Key does not exist, but we want it to: error out.
		return nil, fmt.Errorf("table %q does not exist", n.Name.Table())
	}

	targetDbDesc, err := p.getDatabaseDesc(n.NewName.Database())
	if err != nil {
		return nil, err
	}
	if targetDbDesc == nil {
		return nil, sqlbase.NewUndefinedDatabaseError(n.NewName.Database())
	}

	if err := p.checkPrivilege(targetDbDesc, privilege.CREATE); err != nil {
		return nil, err
	}

	if n.Name.Database() == n.NewName.Database() && n.Name.Table() == n.NewName.Table() {
		// Noop.
		return &emptyNode{}, nil
	}

	tableDesc, err := p.getTableDesc(n.Name)
	if err != nil {
		return nil, err
	}
	if tableDesc == nil || tableDesc.State != sqlbase.TableDescriptor_PUBLIC {
		return nil, sqlbase.NewUndefinedTableError(n.Name.String())
	}

	if err := p.checkPrivilege(tableDesc, privilege.DROP); err != nil {
		return nil, err
	}

	tableDesc.SetName(n.NewName.Table())
	tableDesc.ParentID = targetDbDesc.ID

	descKey := sqlbase.MakeDescMetadataKey(tableDesc.GetID())
	newTbKey := tableKey{targetDbDesc.ID, n.NewName.Table()}.Key()

	if err := tableDesc.Validate(); err != nil {
		return nil, err
	}

	descID := tableDesc.GetID()
	descDesc := sqlbase.WrapDescriptor(tableDesc)

	if err := tableDesc.SetUpVersion(); err != nil {
		return nil, err
	}
	renameDetails := sqlbase.TableDescriptor_RenameInfo{
		OldParentID: uint32(dbDesc.ID),
		OldName:     n.Name.Table()}
	tableDesc.Renames = append(tableDesc.Renames, renameDetails)
	if err := p.writeTableDesc(tableDesc); err != nil {
		return nil, err
	}

	// We update the descriptor to the new name, but also leave the mapping of the
	// old name to the id, so that the name is not reused until the schema changer
	// has made sure it's not in use any more.
	b := client.Batch{}
	b.Put(descKey, descDesc)
	b.CPut(newTbKey, descID, nil)

	if err := p.txn.Run(&b); err != nil {
		if _, ok := err.(*roachpb.ConditionFailedError); ok {
			return nil, fmt.Errorf("table name %q already exists", n.NewName.Table())
		}
		return nil, err
	}
	p.notifySchemaChange(tableDesc.ID, sqlbase.InvalidMutationID)

	p.setTestingVerifyMetadata(func(systemConfig config.SystemConfig) error {
		if err := expectDescriptorID(systemConfig, newTbKey, descID); err != nil {
			return err
		}
		if err := expectDescriptor(systemConfig, descKey, descDesc); err != nil {
			return err
		}
		return nil
	})

	return &emptyNode{}, nil
}