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rows.go
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rows.go
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/*
Copyright 2020 The Vitess Authors.
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 fakevtsql
import (
"database/sql/driver"
"errors"
"fmt"
"io"
)
var (
// ErrBadRow is returned from Next() when a row has an incorrect number of
// fields.
ErrBadRow = errors.New("bad sql row")
// ErrRowsClosed is returned when attempting to operate on an already-closed
// Rows.
ErrRowsClosed = errors.New("err rows closed")
)
type rows struct {
cols []string
vals [][]any
pos int
closed bool
}
var _ driver.Rows = (*rows)(nil)
func (r *rows) Close() error {
r.closed = true
return nil
}
func (r *rows) Columns() []string {
return r.cols
}
func (r *rows) Next(dest []driver.Value) error {
if r.closed {
return ErrRowsClosed
}
if r.pos >= len(r.vals) {
return io.EOF
}
row := r.vals[r.pos]
r.pos++
if len(row) != len(r.cols) {
return fmt.Errorf("%w: row %d has %d fields but %d cols", ErrBadRow, r.pos-1, len(row), len(r.cols))
}
for i := 0; i < len(r.cols); i++ {
dest[i] = row[i]
}
return nil
}