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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 (
"sort"
"strings"
"github.com/Sndav/go-mysql-server/sql"
)
// ShowDatabases is a node that shows the databases.
type ShowDatabases struct {
Catalog *sql.Catalog
}
// 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
}
// Schema implements the Node interface.
func (*ShowDatabases) Schema() sql.Schema {
return sql.Schema{{
Name: "Database",
Type: sql.LongText,
Nullable: false,
}}
}
// RowIter implements the Node interface.
func (p *ShowDatabases) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
dbs := p.Catalog.AllDatabases()
var rows = make([]sql.Row, 0, len(dbs))
for _, db := range dbs {
rows = append(rows, sql.Row{db.Name()})
}
sort.Slice(rows, func(i, j int) bool {
return strings.Compare(rows[i][0].(string), rows[j][0].(string)) < 0
})
return sql.RowsToRowIter(rows...), nil
}
// 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
}
func (p ShowDatabases) String() string {
return "ShowDatabases"
}