421 lines
11 KiB
Go
421 lines
11 KiB
Go
|
/*
|
||
|
|
Copyright 2017 Google Inc. 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 spanner_test
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"fmt"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"cloud.google.com/go/spanner"
|
||
|
|
"golang.org/x/net/context"
|
||
|
|
"google.golang.org/api/iterator"
|
||
|
|
)
|
||
|
|
|
||
|
|
func ExampleNewClient() {
|
||
|
|
ctx := context.Background()
|
||
|
|
const myDB = "projects/my-project/instances/my-instance/database/my-db"
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
_ = client // TODO: Use client.
|
||
|
|
}
|
||
|
|
|
||
|
|
const myDB = "projects/my-project/instances/my-instance/database/my-db"
|
||
|
|
|
||
|
|
func ExampleNewClientWithConfig() {
|
||
|
|
ctx := context.Background()
|
||
|
|
const myDB = "projects/my-project/instances/my-instance/database/my-db"
|
||
|
|
client, err := spanner.NewClientWithConfig(ctx, myDB, spanner.ClientConfig{
|
||
|
|
NumChannels: 10,
|
||
|
|
})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
_ = client // TODO: Use client.
|
||
|
|
client.Close() // Close client when done.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleClient_Single() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
iter := client.Single().Query(ctx, spanner.NewStatement("SELECT FirstName FROM Singers"))
|
||
|
|
_ = iter // TODO: iterate using Next or Do.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleClient_ReadOnlyTransaction() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
t := client.ReadOnlyTransaction()
|
||
|
|
defer t.Close()
|
||
|
|
// TODO: Read with t using Read, ReadRow, ReadUsingIndex, or Query.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleClient_ReadWriteTransaction() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
_, err = client.ReadWriteTransaction(ctx, func(txn *spanner.ReadWriteTransaction) error {
|
||
|
|
var balance int64
|
||
|
|
row, err := txn.ReadRow(ctx, "Accounts", spanner.Key{"alice"}, []string{"balance"})
|
||
|
|
if err != nil {
|
||
|
|
// This function will be called again if this is an
|
||
|
|
// IsAborted error.
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
if err := row.Column(0, &balance); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
if balance <= 10 {
|
||
|
|
return errors.New("insufficient funds in account")
|
||
|
|
}
|
||
|
|
balance -= 10
|
||
|
|
m := spanner.Update("Accounts", []string{"user", "balance"}, []interface{}{"alice", balance})
|
||
|
|
txn.BufferWrite([]*spanner.Mutation{m})
|
||
|
|
|
||
|
|
// The buffered mutation will be committed. If the commit
|
||
|
|
// fails with an IsAborted error, this function will be called
|
||
|
|
// again.
|
||
|
|
return nil
|
||
|
|
})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleClient_Apply() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
m := spanner.Update("Users", []string{"name", "email"}, []interface{}{"alice", "a@example.com"})
|
||
|
|
_, err = client.Apply(ctx, []*spanner.Mutation{m})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleInsert() {
|
||
|
|
m := spanner.Insert("Users", []string{"name", "email"}, []interface{}{"alice", "a@example.com"})
|
||
|
|
_ = m // TODO: use with Client.Apply or in a ReadWriteTransaction.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleInsertMap() {
|
||
|
|
m := spanner.InsertMap("Users", map[string]interface{}{
|
||
|
|
"name": "alice",
|
||
|
|
"email": "a@example.com",
|
||
|
|
})
|
||
|
|
_ = m // TODO: use with Client.Apply or in a ReadWriteTransaction.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleInsertStruct() {
|
||
|
|
type User struct {
|
||
|
|
Name, Email string
|
||
|
|
}
|
||
|
|
u := User{Name: "alice", Email: "a@example.com"}
|
||
|
|
m, err := spanner.InsertStruct("Users", u)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
_ = m // TODO: use with Client.Apply or in a ReadWriteTransaction.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleDelete() {
|
||
|
|
m := spanner.Delete("Users", spanner.Key{"alice"})
|
||
|
|
_ = m // TODO: use with Client.Apply or in a ReadWriteTransaction.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleDeleteKeyRange() {
|
||
|
|
m := spanner.DeleteKeyRange("Users", spanner.KeyRange{
|
||
|
|
Start: spanner.Key{"alice"},
|
||
|
|
End: spanner.Key{"bob"},
|
||
|
|
Kind: spanner.ClosedClosed,
|
||
|
|
})
|
||
|
|
_ = m // TODO: use with Client.Apply or in a ReadWriteTransaction.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRowIterator_Next() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
iter := client.Single().Query(ctx, spanner.NewStatement("SELECT FirstName FROM Singers"))
|
||
|
|
defer iter.Stop()
|
||
|
|
for {
|
||
|
|
row, err := iter.Next()
|
||
|
|
if err == iterator.Done {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
var firstName string
|
||
|
|
if err := row.Column(0, &firstName); err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println(firstName)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRowIterator_Do() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
iter := client.Single().Query(ctx, spanner.NewStatement("SELECT FirstName FROM Singers"))
|
||
|
|
err = iter.Do(func(r *spanner.Row) error {
|
||
|
|
var firstName string
|
||
|
|
if err := r.Column(0, &firstName); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
fmt.Println(firstName)
|
||
|
|
return nil
|
||
|
|
})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRow_Size() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
row, err := client.Single().ReadRow(ctx, "Accounts", spanner.Key{"alice"}, []string{"name", "balance"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println(row.Size()) // size is 2
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRow_ColumnName() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
row, err := client.Single().ReadRow(ctx, "Accounts", spanner.Key{"alice"}, []string{"name", "balance"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println(row.ColumnName(1)) // prints "balance"
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRow_ColumnIndex() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
row, err := client.Single().ReadRow(ctx, "Accounts", spanner.Key{"alice"}, []string{"name", "balance"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
index, err := row.ColumnIndex("balance")
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println(index)
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRow_ColumnNames() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
row, err := client.Single().ReadRow(ctx, "Accounts", spanner.Key{"alice"}, []string{"name", "balance"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println(row.ColumnNames())
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRow_ColumnByName() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
row, err := client.Single().ReadRow(ctx, "Accounts", spanner.Key{"alice"}, []string{"name", "balance"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
var balance int64
|
||
|
|
if err := row.ColumnByName("balance", &balance); err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println(balance)
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRow_Columns() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
row, err := client.Single().ReadRow(ctx, "Accounts", spanner.Key{"alice"}, []string{"name", "balance"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
var name string
|
||
|
|
var balance int64
|
||
|
|
if err := row.Columns(&name, &balance); err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println(name, balance)
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleRow_ToStruct() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
row, err := client.Single().ReadRow(ctx, "Accounts", spanner.Key{"alice"}, []string{"name", "balance"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
|
||
|
|
type Account struct {
|
||
|
|
Name string
|
||
|
|
Balance int64
|
||
|
|
}
|
||
|
|
|
||
|
|
var acct Account
|
||
|
|
if err := row.ToStruct(&acct); err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println(acct)
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleReadOnlyTransaction_Read() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
iter := client.Single().Read(ctx, "Users",
|
||
|
|
spanner.Keys(spanner.Key{"alice"}, spanner.Key{"bob"}),
|
||
|
|
[]string{"name", "email"})
|
||
|
|
_ = iter // TODO: iterate using Next or Do.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleReadOnlyTransaction_ReadUsingIndex() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
iter := client.Single().ReadUsingIndex(ctx, "Users",
|
||
|
|
"UsersByEmail",
|
||
|
|
spanner.Keys(spanner.Key{"a@example.com"}, spanner.Key{"b@example.com"}),
|
||
|
|
[]string{"name", "email"})
|
||
|
|
_ = iter // TODO: iterate using Next or Do.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleReadOnlyTransaction_ReadRow() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
row, err := client.Single().ReadRow(ctx, "Users", spanner.Key{"alice"},
|
||
|
|
[]string{"name", "email"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
_ = row // TODO: use row
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleReadOnlyTransaction_Query() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
iter := client.Single().Query(ctx, spanner.NewStatement("SELECT FirstName FROM Singers"))
|
||
|
|
_ = iter // TODO: iterate using Next or Do.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleNewStatement() {
|
||
|
|
stmt := spanner.NewStatement("SELECT FirstName, LastName FROM SINGERS WHERE LastName >= @start")
|
||
|
|
stmt.Params["start"] = "Dylan"
|
||
|
|
// TODO: Use stmt in Query.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleNewStatement_structLiteral() {
|
||
|
|
stmt := spanner.Statement{
|
||
|
|
SQL: "SELECT FirstName, LastName FROM SINGERS WHERE LastName >= @start",
|
||
|
|
Params: map[string]interface{}{"start": "Dylan"},
|
||
|
|
}
|
||
|
|
_ = stmt // TODO: Use stmt in Query.
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleReadOnlyTransaction_Timestamp() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
txn := client.Single()
|
||
|
|
row, err := txn.ReadRow(ctx, "Users", spanner.Key{"alice"},
|
||
|
|
[]string{"name", "email"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
readTimestamp, err := txn.Timestamp()
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println("read happened at", readTimestamp)
|
||
|
|
_ = row // TODO: use row
|
||
|
|
}
|
||
|
|
|
||
|
|
func ExampleReadOnlyTransaction_WithTimestampBound() {
|
||
|
|
ctx := context.Background()
|
||
|
|
client, err := spanner.NewClient(ctx, myDB)
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
txn := client.Single().WithTimestampBound(spanner.MaxStaleness(30 * time.Second))
|
||
|
|
row, err := txn.ReadRow(ctx, "Users", spanner.Key{"alice"}, []string{"name", "email"})
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
_ = row // TODO: use row
|
||
|
|
readTimestamp, err := txn.Timestamp()
|
||
|
|
if err != nil {
|
||
|
|
// TODO: Handle error.
|
||
|
|
}
|
||
|
|
fmt.Println("read happened at", readTimestamp)
|
||
|
|
}
|