forked from pingcap/tidb
/
show.go
56 lines (49 loc) · 1.36 KB
/
show.go
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// Copyright 2015 PingCAP, Inc.
//
// Licensed 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package rsets
import (
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/plan"
"github.com/pingcap/tidb/plan/plans"
"github.com/pingcap/tidb/sessionctx/db"
)
var (
_ plan.Planner = (*ShowRset)(nil)
)
// ShowRset is record set to show.
type ShowRset struct {
Target int
DBName string
TableName string
ColumnName string
Flag int
Full bool
}
// Plan gets ShowPlan.
func (r *ShowRset) Plan(ctx context.Context) (plan.Plan, error) {
return &plans.ShowPlan{
Target: r.Target,
DBName: r.getDBName(ctx),
TableName: r.TableName,
ColumnName: r.ColumnName,
Flag: r.Flag,
Full: r.Full,
}, nil
}
func (r *ShowRset) getDBName(ctx context.Context) string {
if len(r.DBName) > 0 {
return r.DBName
}
// if r.DBName is empty, we should use current db name if possible.
return db.GetCurrentSchema(ctx)
}