wehub-resource-sync
126 lines
3.4 KiB
Go
126 lines
3.4 KiB
Go
// Copyright 2025 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package node
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import (
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"context"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core"
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"github.com/dolthub/doltgresql/server/types"
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)
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// ShowSchemas is a node that implements the SHOW SCHEMAS statement.
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type ShowSchemas struct {
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// TODO: we need planbuilder integration to support SHOW SCHEMAS, rather than getting everything at runtime
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database string
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}
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var _ sql.ExecSourceRel = (*ShowSchemas)(nil)
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// NewShowSchemas returns a new *ShowSchemas.
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func NewShowSchemas(database string) *ShowSchemas {
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return &ShowSchemas{
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database: database,
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}
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}
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// Children implements the interface sql.ExecSourceRel.
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func (s *ShowSchemas) Children() []sql.Node {
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return []sql.Node{}
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}
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// IsReadOnly implements the interface sql.ExecSourceRel.
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func (s *ShowSchemas) IsReadOnly() bool {
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return true
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}
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// Resolved implements the interface sql.ExecSourceRel.
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func (s *ShowSchemas) Resolved() bool {
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return true
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}
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// RowIter implements the interface sql.ExecSourceRel.
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func (s *ShowSchemas) RowIter(ctx *sql.Context, r sql.Row) (sql.RowIter, error) {
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database := s.database
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if database == "" {
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database = ctx.GetCurrentDatabase()
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if database == "" {
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return nil, errors.New("no database selected (this is a bug)")
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}
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}
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db, err := core.GetSqlDatabaseFromContext(ctx, database)
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if err != nil {
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return nil, err
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}
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if db == nil {
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return nil, errors.New("database not found: " + database)
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}
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sdb, ok := db.(sql.SchemaDatabase)
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if !ok {
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// This handles any database that doesn't support schemas (such as some system databases)
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// TODO: mirror the postgres behavior of returning, every database should have schemas
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return sql.RowsToRowIter(), nil
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}
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schemas, err := sdb.AllSchemas(ctx)
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if err != nil {
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return nil, err
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}
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rows := make([]sql.Row, len(schemas))
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for i, schema := range schemas {
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rows[i] = sql.Row{schema.SchemaName()}
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}
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return sql.RowsToRowIter(rows...), nil
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}
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// Schema implements the interface sql.ExecSourceRel.
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func (s *ShowSchemas) Schema(ctx *sql.Context) sql.Schema {
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return sql.Schema{
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{Name: "schema_name", Type: types.Text, Source: "show schemas"},
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}
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}
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// String implements the interface sql.ExecSourceRel.
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func (s *ShowSchemas) String() string {
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if s.database == "" {
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return "SHOW SCHEMAS FROM " + s.database
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}
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return "SHOW SCHEMAS"
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}
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// WithChildren implements the interface sql.ExecSourceRel.
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func (s *ShowSchemas) WithChildren(ctx *sql.Context, children ...sql.Node) (sql.Node, error) {
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if len(children) != 0 {
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return nil, errors.New("SHOW SCHEMAS does not support children")
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}
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return s, nil
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}
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// WithResolvedChildren implements the interface vitess.InjectedStatement.
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func (s *ShowSchemas) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
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if len(children) != 0 {
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return nil, errors.New("SHOW SCHEMAS does not support children")
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}
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return s, nil
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}
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