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// Copyright 2021 Google LLC
//
// 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
//
// https://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 spannerdriver
import (
"database/sql/driver"
"fmt"
"io"
"testing"
"cloud.google.com/go/spanner"
sppb "google.golang.org/genproto/googleapis/spanner/v1"
)
type testIterator struct {
metadata *sppb.ResultSetMetadata
rows []*spanner.Row
index int
}
func (t *testIterator) Next() (*spanner.Row, error) {
if t.index == len(t.rows) {
return nil, io.EOF
}
row := t.rows[t.index]
t.index++
return row, nil
}
func (t *testIterator) Stop() {
}
func (t *testIterator) Metadata() *sppb.ResultSetMetadata {
return t.metadata
}
func newRow(t *testing.T, cols []string, vals []interface{}) *spanner.Row {
row, err := spanner.NewRow(cols, vals)
if err != nil {
t.Fatalf("failed to create test row: %v", err)
}
return row
}
func TestRows_Next(t *testing.T) {
cols := []string{"COL1", "COL2", "COL3"}
it := testIterator{
metadata: &sppb.ResultSetMetadata{
RowType: &sppb.StructType{
Fields: []*sppb.StructType_Field{
{Name: "COL1", Type: &sppb.Type{Code: sppb.TypeCode_INT64}},
{Name: "COL2", Type: &sppb.Type{Code: sppb.TypeCode_STRING}},
{Name: "COL3", Type: &sppb.Type{Code: sppb.TypeCode_FLOAT64}},
},
},
},
rows: []*spanner.Row{
newRow(t, cols, []interface{}{int64(1), "Test1", 3.14 * 1.0}),
newRow(t, cols, []interface{}{int64(2), spanner.NullString{}, spanner.NullFloat64{}}),
newRow(t, cols, []interface{}{int64(3), "Test3", 3.14 * 3.0}),
},
}
rows := rows{it: &it}
dest := make([]driver.Value, 3)
values := make([][]driver.Value, 0)
for {
err := rows.Next(dest)
if err == io.EOF {
break
}
row := make([]driver.Value, 3)
copy(row, dest)
values = append(values, row)
}
if g, w := len(values), 3; g != w {
t.Fatalf("values length mismatch\nGot: %v\nWant: %v", g, w)
}
for i := int64(0); i < int64(len(values)); i++ {
if g, w := values[i][0], i+1; g != w {
t.Fatalf("COL1 value mismatch for row %d\nGot: %v\nWant: %v", i, g, w)
}
if i == 0 || i == 2 {
if g, w := values[i][1], fmt.Sprintf("Test%d", i+1); g != w {
t.Fatalf("COL2 value mismatch for row %d\nGot: %v\nWant: %v", i, g, w)
}
if g, w := values[i][2], 3.14*float64(i+1); g != w {
t.Fatalf("COL3 value mismatch for row %d\nGot: %v\nWant: %v", i, g, w)
}
} else {
if g, w := values[i][1], driver.Value(nil); g != w {
t.Fatalf("COL2 value mismatch for row %d\nGot: %v\nWant: %v", i, g, w)
}
if g, w := values[i][2], driver.Value(nil); g != w {
t.Fatalf("COL3 value mismatch for row %d\nGot: %v\nWant: %v", i, g, w)
}
}
}
}