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show_create.go
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show_create.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 dal
import (
"context"
"strings"
)
import (
"github.com/pkg/errors"
)
import (
"github.com/arana-db/arana/pkg/dataset"
"github.com/arana-db/arana/pkg/mysql/rows"
"github.com/arana-db/arana/pkg/proto"
"github.com/arana-db/arana/pkg/resultx"
"github.com/arana-db/arana/pkg/runtime/ast"
"github.com/arana-db/arana/pkg/runtime/plan"
)
var _ proto.Plan = (*ShowCreatePlan)(nil)
type ShowCreatePlan struct {
plan.BasePlan
Stmt *ast.ShowCreate
Database string
Table string
}
// NewShowCreatePlan create ShowCreate Plan
func NewShowCreatePlan(stmt *ast.ShowCreate) *ShowCreatePlan {
return &ShowCreatePlan{
Stmt: stmt,
}
}
func (st *ShowCreatePlan) Type() proto.PlanType {
return proto.PlanTypeQuery
}
func (st *ShowCreatePlan) ExecIn(ctx context.Context, conn proto.VConn) (proto.Result, error) {
var (
sb strings.Builder
indexes []int
res proto.Result
err error
)
if err = st.Stmt.ResetTable(st.Table).Restore(ast.RestoreDefault, &sb, &indexes); err != nil {
return nil, errors.WithStack(err)
}
var (
query = sb.String()
args = st.ToArgs(indexes)
target = st.Stmt.Target()
)
if res, err = conn.Query(ctx, st.Database, query, args...); err != nil {
return nil, errors.WithStack(err)
}
ds, err := res.Dataset()
if err != nil {
return nil, errors.WithStack(err)
}
// sharding table should be changed of target name
if st.Table != target {
fields, _ := ds.Fields()
ds = dataset.Pipe(ds,
dataset.Map(nil, func(next proto.Row) (proto.Row, error) {
dest := make([]proto.Value, len(fields))
if next.Scan(dest) != nil {
return next, nil
}
dest[0] = proto.NewValueString(target)
dest[1] = proto.NewValueString(strings.Replace(dest[1].String(), st.Table, target, 1))
if next.IsBinary() {
return rows.NewBinaryVirtualRow(fields, dest), nil
}
return rows.NewTextVirtualRow(fields, dest), nil
}),
)
}
return resultx.New(resultx.WithDataset(ds)), nil
}