/
show_create_database.go
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/
show_create_database.go
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// Copyright 2020-2021 Dolthub, 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,
// 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 plan
import (
"fmt"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/types"
)
// ShowCreateDatabase returns the SQL for creating a database.
type ShowCreateDatabase struct {
db sql.Database
IfNotExists bool
}
var showCreateDatabaseSchema = sql.Schema{
{Name: "Database", Type: types.LongText},
{Name: "Create Database", Type: types.LongText},
}
// NewShowCreateDatabase creates a new ShowCreateDatabase node.
func NewShowCreateDatabase(db sql.Database, ifNotExists bool) *ShowCreateDatabase {
return &ShowCreateDatabase{db, ifNotExists}
}
var _ sql.Node = (*ShowCreateDatabase)(nil)
var _ sql.Databaser = (*ShowCreateDatabase)(nil)
var _ sql.CollationCoercible = (*ShowCreateDatabase)(nil)
// Database implements the sql.Databaser interface.
func (s *ShowCreateDatabase) Database() sql.Database {
return s.db
}
func (s *ShowCreateDatabase) IsReadOnly() bool {
return true
}
// WithDatabase implements the sql.Databaser interface.
func (s *ShowCreateDatabase) WithDatabase(db sql.Database) (sql.Node, error) {
nc := *s
nc.db = db
return &nc, nil
}
// Schema implements the sql.Node interface.
func (s *ShowCreateDatabase) Schema() sql.Schema {
return showCreateDatabaseSchema
}
func (s *ShowCreateDatabase) String() string {
return fmt.Sprintf("SHOW CREATE DATABASE %s", s.db.Name())
}
// Children implements the sql.Node interface.
func (s *ShowCreateDatabase) Children() []sql.Node { return nil }
// Resolved implements the sql.Node interface.
func (s *ShowCreateDatabase) Resolved() bool {
_, ok := s.db.(sql.UnresolvedDatabase)
return !ok
}
// WithChildren implements the Node interface.
func (s *ShowCreateDatabase) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(s, len(children), 0)
}
return s, nil
}
// CheckPrivileges implements the interface sql.Node.
func (s *ShowCreateDatabase) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
// The database won't be visible during the resolution step if the user doesn't have the correct privileges
return true
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*ShowCreateDatabase) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}