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showdatabases.go
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showdatabases.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 (
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/types"
)
// ShowDatabases is a node that shows the databases.
type ShowDatabases struct {
Catalog sql.Catalog
}
var _ sql.Node = (*ShowDatabases)(nil)
var _ sql.CollationCoercible = (*ShowDatabases)(nil)
// NewShowDatabases creates a new show databases node.
func NewShowDatabases() *ShowDatabases {
return new(ShowDatabases)
}
// Resolved implements the Resolvable interface.
func (p *ShowDatabases) Resolved() bool {
return true
}
// Children implements the Node interface.
func (*ShowDatabases) Children() []sql.Node {
return nil
}
func (*ShowDatabases) IsReadOnly() bool {
return true
}
// Schema implements the Node interface.
func (*ShowDatabases) Schema() sql.Schema {
return sql.Schema{{
Name: "Database",
Type: types.LongText,
Nullable: false,
}}
}
// WithChildren implements the Node interface.
func (p *ShowDatabases) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(p, len(children), 0)
}
return p, nil
}
// CheckPrivileges implements the interface sql.Node.
func (p *ShowDatabases) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
//TODO: Having the "SHOW DATABASES" privilege should allow one to see all databases
// Currently, only shows databases that the user has access to
return true
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*ShowDatabases) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
func (p ShowDatabases) String() string {
return "ShowDatabases"
}