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local_sequence.go
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local_sequence.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package dml
import (
"context"
"strings"
)
import (
"github.com/pkg/errors"
)
import (
consts "github.com/arana-db/arana/pkg/constants/mysql"
"github.com/arana-db/arana/pkg/dataset"
"github.com/arana-db/arana/pkg/mysql/rows"
"github.com/arana-db/arana/pkg/mysql/thead"
"github.com/arana-db/arana/pkg/proto"
"github.com/arana-db/arana/pkg/proto/rule"
"github.com/arana-db/arana/pkg/resultx"
"github.com/arana-db/arana/pkg/runtime/ast"
rcontext "github.com/arana-db/arana/pkg/runtime/context"
"github.com/arana-db/arana/pkg/runtime/plan"
)
var _ proto.Plan = (*LocalSequencePlan)(nil)
type LocalSequencePlan struct {
plan.BasePlan
Stmt *ast.SelectStatement
VTs []*rule.VTable
ColumnList []string
}
func (s *LocalSequencePlan) Type() proto.PlanType {
return proto.PlanTypeQuery
}
func (s *LocalSequencePlan) ExecIn(ctx context.Context, _ proto.VConn) (proto.Result, error) {
_, span := plan.Tracer.Start(ctx, "LocalSequencePlan.ExecIn")
defer span.End()
var (
theadLocalSelect thead.Thead
columns []proto.Field
values []proto.Value
)
for idx := 0; s.Stmt.From == nil && idx < len(s.Stmt.Select); idx++ {
if seqColumn, ok := s.Stmt.Select[idx].(*ast.SelectElementColumn); ok && len(seqColumn.Name) == 2 {
seqName, seqFunc := seqColumn.Name[0], seqColumn.Name[1]
colName := seqColumn.Alias()
if colName == "" {
colName = strings.Join(seqColumn.Name, ".")
}
theadLocalSelect = append(theadLocalSelect, thead.Col{Name: colName, FieldType: consts.FieldTypeLong})
seq, err := proto.LoadSequenceManager().GetSequence(ctx, rcontext.Tenant(ctx), rcontext.Schema(ctx), seqName)
if err != nil {
return nil, errors.WithStack(err)
}
switch strings.ToLower(seqFunc) {
case "currval":
values = append(values, proto.NewValueInt64(seq.(proto.EnhancedSequence).CurrentVal()))
case "nextval":
nextSeqVal, err := seq.Acquire(ctx)
if err != nil {
return nil, err
}
values = append(values, proto.NewValueInt64(nextSeqVal))
}
}
}
columns = theadLocalSelect.ToFields()
ds := &dataset.VirtualDataset{
Columns: columns,
}
ds.Rows = append(ds.Rows, rows.NewTextVirtualRow(columns, values))
return resultx.New(resultx.WithDataset(ds)), nil
}