forked from pingcap/tidb
/
show.go
80 lines (68 loc) · 2.2 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 stmts
import (
"github.com/ngaut/log"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/rset"
"github.com/pingcap/tidb/rset/rsets"
"github.com/pingcap/tidb/stmt"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/util/format"
)
var _ stmt.Statement = (*ShowStmt)(nil)
// ShowStmt is a statement to provide information about databases, tables, columns and so on.
// See: https://dev.mysql.com/doc/refman/5.7/en/show.html
type ShowStmt struct {
Target int // Databases/Tables/Columns/....
DBName string
TableIdent table.Ident // Used for showing columns.
ColumnName string // Used for `desc table column`.
Flag int // Some flag parsed from sql, such as FULL.
Full bool
Text string
}
// Explain implements the stmt.Statement Explain interface.
func (s *ShowStmt) Explain(ctx context.Context, w format.Formatter) {
w.Format("%s\n", s.Text)
}
// IsDDL implements the stmt.Statement IsDDL interface.
func (s *ShowStmt) IsDDL() bool {
return false
}
// OriginText implements the stmt.Statement OriginText interface.
func (s *ShowStmt) OriginText() string {
return s.Text
}
// SetText implements the stmt.Statement SetText interface.
func (s *ShowStmt) SetText(text string) {
s.Text = text
}
// Exec implements the stmt.Statement Exec interface.
func (s *ShowStmt) Exec(ctx context.Context) (_ rset.Recordset, err error) {
// TODO: finish this
log.Debug("Exec Show Stmt")
sr := &rsets.ShowRset{
Target: s.Target,
DBName: s.DBName,
TableName: s.TableIdent.Name.O,
ColumnName: s.ColumnName,
Flag: s.Flag,
Full: s.Full,
}
r, err := sr.Plan(ctx)
if err != nil {
return nil, err
}
return rsets.Recordset{ctx, r}, nil
}