/
table_editor.go
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/
table_editor.go
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// Copyright 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 (
"io"
"sync"
"github.com/dolthub/go-mysql-server/sql"
)
// tableEditorIter wraps the given iterator and calls the Begin and Complete functions on the given table.
type tableEditorIter struct {
once *sync.Once
onceCtx *sql.Context
editor sql.TableEditor
inner sql.RowIter
errorEncountered error
}
var _ sql.RowIter = (*tableEditorIter)(nil)
// NewTableEditorIter returns a new *tableEditorIter by wrapping the given iterator. If the
// "statement_boundaries" session variable is set to false, then the original iterator is returned.
func NewTableEditorIter(ctx *sql.Context, table sql.TableEditor, wrappedIter sql.RowIter) sql.RowIter {
return &tableEditorIter{
once: &sync.Once{},
onceCtx: ctx,
editor: table,
inner: wrappedIter,
errorEncountered: nil,
}
}
// Next implements the interface sql.RowIter.
func (s *tableEditorIter) Next() (sql.Row, error) {
s.once.Do(func() {
s.editor.StatementBegin(s.onceCtx)
})
row, err := s.inner.Next()
if err != nil && err != io.EOF && !ErrInsertIgnore.Is(err) {
s.errorEncountered = err
}
return row, err
}
// Close implements the interface sql.RowIter.
func (s *tableEditorIter) Close(ctx *sql.Context) error {
var err error
if s.errorEncountered != nil {
err = s.editor.DiscardChanges(ctx, s.errorEncountered)
} else {
err = s.editor.StatementComplete(ctx)
}
if err != nil {
_ = s.inner.Close(ctx)
} else {
err = s.inner.Close(ctx)
}
return err
}