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rows.go
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rows.go
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// Copyright 2019 The SQLFlow Authors. All rights reserved.
// 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 goalisa
import (
"database/sql/driver"
"io"
"reflect"
"strings"
)
var builtinString = reflect.TypeOf(string(""))
type alisaRows struct {
rowIdx int
result *alisaTaskResult
}
// Close closes the rows iterator.
func (ar *alisaRows) Close() error {
ar.rowIdx = -1
ar.result = nil
return nil
}
// Columns returns the names of the columns.
func (ar *alisaRows) Columns() []string {
columnNames := []string{}
for _, c := range ar.result.columns {
columnNames = append(columnNames, c.name)
}
return columnNames
}
// Next is called to populate the next row of data into
// the provided slice. The provided slice will be the same
// size as the Columns() are wide.
//
// NOTE(weiguoz): `\N` denotes nil, even outher types
func (ar *alisaRows) Next(dst []driver.Value) error {
if ar.rowIdx >= len(ar.result.body) {
return io.EOF
}
// Fill in dest with one single row data.
for colIndex, value := range ar.result.body[ar.rowIdx] {
dst[colIndex] = value
}
ar.rowIdx++
return nil
}
// RowsColumnTypeScanType always gives string type
func (ar *alisaRows) ColumnTypeScanType(i int) reflect.Type {
return builtinString
}
// RowsColumnTypeDatabaseTypeName returns the database system type name in uppercase.
func (ar *alisaRows) ColumnTypeDatabaseTypeName(i int) string {
return strings.ToUpper(ar.result.columns[i].typ)
}