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* feat: support mutations * chore: address review comments * chore: address last review comment
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| Original file line number | Diff line number | Diff line change |
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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 main | ||
|
|
||
| import ( | ||
| "context" | ||
| "database/sql" | ||
| "fmt" | ||
| "time" | ||
|
|
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| "cloud.google.com/go/spanner" | ||
| "github.com/cloudspannerecosystem/go-sql-spanner" | ||
| "github.com/cloudspannerecosystem/go-sql-spanner/examples" | ||
| ) | ||
|
|
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| var createTableStatement = "CREATE TABLE Singers (SingerId INT64, Name STRING(MAX)) PRIMARY KEY (SingerId)" | ||
|
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| func mutations(projectId, instanceId, databaseId string) error { | ||
| ctx := context.Background() | ||
| db, err := sql.Open("spanner", fmt.Sprintf("projects/%s/instances/%s/databases/%s", projectId, instanceId, databaseId)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer db.Close() | ||
|
|
||
| // Get a connection so that we can get access to the Spanner specific connection interface SpannerConn. | ||
| conn, err := db.Conn(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| // Mutations can be written outside an explicit transaction using SpannerConn#Apply. | ||
| var commitTimestamp time.Time | ||
| if err := conn.Raw(func(driverConn interface{}) error { | ||
| spannerConn, ok := driverConn.(spannerdriver.SpannerConn) | ||
| if !ok { | ||
| return fmt.Errorf("unexpected driver connection %v, expected SpannerConn", driverConn) | ||
| } | ||
| commitTimestamp, err = spannerConn.Apply(ctx, []*spanner.Mutation{ | ||
| spanner.Insert("Singers", []string{"SingerId", "Name"}, []interface{}{int64(1), "Richard Moore"}), | ||
| spanner.Insert("Singers", []string{"SingerId", "Name"}, []interface{}{int64(2), "Alice Henderson"}), | ||
| }) | ||
| return err | ||
| }); err != nil { | ||
| return err | ||
| } | ||
| fmt.Printf("The transaction with two singer mutations was committed at %v\n", commitTimestamp) | ||
|
|
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| // Mutations can also be executed as part of a read/write transaction. | ||
| // Note: The transaction is started using the connection that we had obtained. This is necessary in order to | ||
| // ensure that the conn.Raw call below will use the same connection as the one that just started the transaction. | ||
| tx, err := conn.BeginTx(ctx, &sql.TxOptions{}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| // Get the name of a singer and update it using a mutation. | ||
| id := int64(1) | ||
| row := tx.QueryRowContext(ctx, "SELECT Name FROM Singers WHERE SingerId=@id", id) | ||
| var name string | ||
| if err := row.Scan(&name); err != nil { | ||
| return err | ||
| } | ||
| if err := conn.Raw(func(driverConn interface{}) error { | ||
| spannerConn, ok := driverConn.(spannerdriver.SpannerConn) | ||
| if !ok { | ||
| return fmt.Errorf("unexpected driver connection %v, expected SpannerConn", driverConn) | ||
| } | ||
| return spannerConn.BufferWrite([]*spanner.Mutation{ | ||
| spanner.Update("Singers", []string{"SingerId", "Name"}, []interface{}{id, name + "-Henderson"}), | ||
| }) | ||
| }); err != nil { | ||
| return err | ||
| } | ||
| if err := tx.Commit(); err != nil { | ||
| return err | ||
| } | ||
| fmt.Print("Updated the name of the first singer\n") | ||
|
|
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| // Read back the updated row. | ||
| row = db.QueryRowContext(ctx, "SELECT SingerId, Name FROM Singers WHERE SingerId = @id", id) | ||
| if err := row.Err(); err != nil { | ||
| return err | ||
| } | ||
| if err := row.Scan(&id, &name); err != nil { | ||
| return err | ||
| } | ||
| fmt.Printf("Updated singer: %v %v\n", id, name) | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func main() { | ||
| examples.RunSampleOnEmulator(mutations, createTableStatement) | ||
| } |
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